Transcript
LT1492/LT1493 5MHz, 3V/µs, Low Power Single Supply, Dual and Quad Precision Op Amps
FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
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DESCRIPTION
Gain-Bandwidth Product: 5MHz Typ Slew Rate: 3V/µs Typ Low Supply Current per Amplifier: 0.55mA Max Input Offset Voltage: 180µV Max Input Offset Voltage Drift: 3µV/°C Max Input Offset Current: 20nA Max Input Bias Current: 100nA Max Open-Loop Gain: 1500V/mV Min (VS = ±15V) Low Input Noise Voltage: 16.5nV/√Hz Low Input Noise Current: 0.14pA/√Hz Large Output Drive Current: 20mA Min Single Supply Operation Input Voltage Range Includes Ground Output Swings to Ground While Sinking Current Wide Supply Voltage Range: 2.5V to 36V Specified on 3.3V, 5V and ±15V Dual in 8-Pin PDIP and SO Package Quad in a Narrow 16-Pin SO Package
The LT ®1492/LT1493 are dual/quad, low power, single supply precision op amps with 5MHz gain-bandwidth product, 3V/µs slew rate and only 450µA of quiescent supply current per amplifier. With a maximum input offset voltage of only 180µV, the LT1492/LT1493 eliminate trims in most systems while providing high frequency performance not usually found in low power single supply amplifiers. The LT1492/LT1493 will operate on any supply greater than 2.5V and less than 36V total, and are specified on single 3.3V, single 5V and ±15V supplies. Even with their low quiescent supply current the minimum output drive is 20mA, ideal for driving low impedance loads. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The low operating voltage and wide input and output range make the LT1492/ LT1493 amplifiers ideal for battery-powered applications. For applications requiring faster precision single supply amplifiers, see the 14MHz, 7V/µs LT1211/LT1212, the 28MHz, 12V/µs LT1213/LT1214 or the 23MHz, 50V/µs LT1215/LT1216.
U APPLICATIONS ■ ■ ■
Battery-Powered Systems Portable Instrumentation Active Filters Photodiode Amplifiers DAC Current to Voltage Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Distribution of Offset Voltage Drift with Temperature
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TYPICAL APPLICATION 50
Precision AC to DC Converter (Full Wave Rectifier and Filter)
4.99k
+
5V 10k VIN
–
1/2 LT1492 15k
–
+
VOUT DC 10µF
10k
1/2 LT1492
+
10k
6.49k
VS = 5V, 0V < 1% ERROR FROM 100mV TO 1V, f = 1kHz 10% ERROR AT 10mV, f = 1kHz 1% ERROR AT 5kHz, VIN = 100mVRMS 10% ERROR AT 30kHz, VIN = 100mVRMS 1492/93 TA01
PERCENT OF UNITS (%)
40
VS = 5V, 0V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
30
20
10
0 – 2.5 – 2 –1.5 –1 – 0.5 0 0.5 1 1.5 2 2.5 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) 1492/93 G02
1
LT1492/LT1493
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ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V + to V –) .............................. 36V Input Current ...................................................... ±15mA Output Short-Circuit Duration (Note 1) ......... Continuous Operating Temperature Range ................ – 40°C to 85°C
Specified Temperature Range (Note 2) .....– 40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION ORDER PART NUMBER
TOP VIEW OUT A
–IN A 2 +IN A 3 V
–
8 V+
1
LT1492CN8 LT1492CS8
7 OUT B
A B
6 –IN B 5 +IN B
4
N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 190°C/ W (S8)
1492
ORDER PART NUMBER
TOP VIEW 16 OUT D
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
10 OUT C
NC
8
9
A
D
15 –IN D
LT1493CS
14 +IN D 13 V –
B
C
12 +IN C 11 –IN C
NC
S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Industrial and Military grade parts.
5V ELECTRICAL CHARACTERISTICS VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
CONDITIONS
MIN
100
180
µV
∆VOS ∆Time
Long-Term Input Offset Voltage Stability
0.6
IOS
Input Offset Current
5
20
nA
IB
Input Bias Current
50
100
nA
µV/Mo
Input Noise Voltage
0.1Hz to 10Hz
330
nVP-P
en
Input Noise Voltage Density
fO = 10Hz fO = 1000Hz
17.3 16.5
nV/√Hz nV/√Hz
in
Input Noise Current Density
fO = 10Hz fO = 1000Hz
0.78 0.14
pA/√Hz pA/√Hz
Input Resistance (Note 3)
Differential Mode Common Mode
10
40 800
MΩ MΩ
Input Capacitance
f = 1MHz
10
pF
3.4 0
3.60 –0.25
V V
Input Voltage Range CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.4V
86
102
dB
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
90
110
dB
2
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
175
350
V/mV
Maximum Output Voltage Swing (Note 4)
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
4.2 4.1 3.0
4.35 4.25 3.15
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA
0.003 0.062 0.362 ±20
MAX
0.006 0.075 0.500
±60
UNITS
V V V
IO
Maximum Output Current (Note 8)
SR
Slew Rate
AV = – 2
1.8
V/µs
GBW
Gain-Bandwidth Product
f = 100kHz
4.5
MHz
IS
Supply Current per Amplifier Minimum Supply Voltage
mA
425
550
2.1
2.5
µA V
Full Power Bandwidth
AV = 1, VO = 2.5VP-P
150
kHz
t r, t f
Rise Time, Fall Time
AV = 1, 10% to 90%, VO = 100mV
100
ns
OS
Overshoot
AV = 1, VO = 100mV
20
%
t PD
Propagation Delay
AV = 1, VO = 100mV
100
ns
tS
Settling Time
0.01%, AV = 1, ∆VO = 2V
2.6
µs
Open-Loop Output Resistance
IO = 0mA, f = 2MHz
Total Harmonic Distortion
AV = 1, VO = 1VRMS, f = 20Hz to 20kHz
THD
130
Ω
0.005
%
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL
PARAMETER
VOS
Input Offset Voltage
VOS ∆T
CONDITIONS
MIN
TYP
MAX
UNITS
●
120
280
µV
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
5
25
nA
IB
Input Bias Current
●
55
110
nA
Input Voltage Range
● ●
3.4 0
3.55 – 0.15
V V
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.4V
●
84
102
dB
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
●
90
110
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
●
140
250
V/mV
Maximum Output Voltage Swing (Note 4)
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
● ● ●
4.1 4.0 2.9
4.25 4.15 3.05
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA
● ● ●
0.004 0.070 0.390
0.007 0.085 0.525
V V V
●
470
650
µA
IS
Supply Current per Amplifier
3
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2) SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
●
150
325
µV
VOS ∆T
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
5
40
nA
IB
Input Bias Current
●
55
130
nA
Input Voltage Range
● ●
3.4 0
3.5 – 0.1
V V
80
90
dB
CMRR
CONDITIONS
MIN
Common Mode Rejection Ratio
VCM = 0V to 3.4V
●
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
●
90
110
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
●
140
220
V/mV
Maximum Output Voltage Swing (Note 4)
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
● ● ●
3.95 3.85 2.75
4.15 4.05 2.95
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA
● ● ●
0.005 0.073 0.400
0.008 0.095 0.575
V V V
●
480
700
µA
IS
Supply Current per Amplifier
±15V ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, VOUT = 0V, TA = 25°C, unless otherwise noted. SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
CONDITIONS
120
450
µV
IOS
Input Offset Current
5
20
nA
IB
Input Bias Current
45
100
nA
Input Voltage Range
MIN
13.4 – 15.0
13.6 – 15.2
V V
CMRR
Common Mode Rejection Ratio
VCM = –15V to 13.4V
86
102
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
90
113
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
1500
6500
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA Output Low, ISINK = 15mA
12.9 – 14.4
13.15 – 14.6
IO
Maximum Output Current
(Note 8)
±20
SR
Slew Rate
AV = – 2, (Note 5)
2
3
V/µs
GBW
Gain-Bandwidth Product
f = 100kHz
3
5
MHz
IS
Supply Current per Amplifier Channel Separation
tS
4
±55
500 VO = ±10V, RL = 5k
128
mA
800
140 ±1.4
Minimum Supply Voltage
V V
µA dB
±2
V
Full Power Bandwidth
AV = 1, VO = 20VP-P
30
kHz
Settling Time
0.01%, AV = 1, ∆VO = 10V
5.8
µs
LT1492/LT1493
±15V ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, VOUT = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL
PARAMETER
VOS
Input Offset Voltage
VOS ∆T
CONDITIONS
MIN
TYP
MAX
UNITS
●
160
550
µV
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
10
30
nA
IB
Input Bias Current
●
55
120
nA
Input Voltage Range
● ●
13.4 – 15.0
13.5 – 15.1
V V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 13.4V
●
84
101
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
●
90
108
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
1200
4000
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA Output Low, ISINK = 15mA
● ●
12.7 – 14.2
13.0 – 14.6
IS
Supply Current per Amplifier
●
V V
600
930
µA
TYP
MAX
UNITS µV
VS = ±15V, VCM = 0V, VOUT = 0V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2) SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
●
180
650
VOS ∆T
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
10
50
nA
IB
Input Bias Current
●
55
150
nA
Input Voltage Range
● ●
13.4 – 15.0
13.45 – 15.05
V V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 13.4V
●
82
101
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
●
90
108
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
1000
3500
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA Output Low, ISINK = 15mA
● ●
12.5 –14.1
12.9 –14.6
V V
IS
Supply Current per Amplifier
●
620
1000
µA
5
LT1492/LT1493
3.3V ELECTRICAL CHARACTERISTICS VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. (Note 6) SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
MIN
Input Voltage Range (Note 7) Maximum Output Voltage Swing
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
MAX
UNITS
100
180
µV
1.7 0
1.9 – 0.2
V V
2.50 2.40 1.30
2.65 2.55 1.45
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA IO
TYP
0.003 0.062 0.362
Maximum Output Current
0.006 0.075 0.500
V V V
±20
±50
MIN
TYP
MAX
UNITS
120
280
µV
mA
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 6) SYMBOL
PARAMETER
VOS
Input Offset Voltage
●
Input Voltage Range (Note 7)
● ●
1.7 0
1.8 – 0.1
V V
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
● ● ●
2.4 2.3 1.2
2.55 2.45 1.35
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA
● ● ●
Maximum Output Voltage Swing
CONDITIONS
0.004 0.070 0.390
0.007 0.085 0.525
V V V
TYP
MAX
UNITS
150
325
µV
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Notes 2, 6) SYMBOL
PARAMETER
VOS
Input Offset Voltage
●
Input Voltage Range (Note 7)
● ●
1.7 0
1.75 – 0.05
V V
Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA
● ● ●
2.25 2.15 1.05
2.45 2.35 1.25
V V V
Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA
● ● ●
Maximum Output Voltage Swing
CONDITIONS
The ● denotes specifications that apply over the full operating temperature range. Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: The LT1492/LT1493 are designed, characterized and expected to meet these extended temperature limits, but are not tested at – 40°C and 85°C. Guaranteed I grade parts are available. Consult factory. Note 3: This parameter is not 100% tested. Note 4: Guaranteed by correlation to VS = 3.3V and VS = ±15V tests.
6
MIN
0.005 0.073 0.400
0.008 0.095 0.575
Note 5: Slew rate is measured between ±5V on an output swing of ±10V on ±15V supplies. Note 6: Most LT1492/LT1493 electrical characteristics change very little with supply voltage. See the 5V tables for characteristics not listed in the 3.3V table. Note 7: Guaranteed by correlation to VS = 5V and VS = ±15V tests. Note 8: Guaranteed by correlation to VS = 3.3V tests.
V V V
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS U W
Distribution of Offset Voltage Drift with Temperature
Distribution of Input Offset Voltage 50 VS = 5V, 0V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
VS = 5V, 0V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
40
30
PERCENT OF UNITS (%)
PERCENT OF UNITS (%)
35
25 20 15 10
Distribution of Input Offset Voltage 40
30
20
10
5
20 15 10
1492/93 G02
100
PHASE
60
80
VS = ±15V
60
40
40
GAIN
30
VS = 5V
20
20
0
10
– 20
0
– 40
VS = ±2.5V
–10
VS = ±15V
–20 1k
10k
PHASE SHIFT (DEG)
50
100k 1M FREQUENCY (Hz)
– 60 – 80 10M
4
TA = – 55°C
5.0 4.5
TA = 125°C
4.0 3.5 70
TA = 125°C
60 50
TA = – 55°C TA = 25°C
40
80
VS = 5V
5 10 20 TOTAL SUPPLY VOLTAGE (V)
1
1 – 50 – 25
30 40
AV = –1
TA = – 55°C
50 40 AV = 1
AV = 5
20 AV = 10
10
36
1492/93 G07
3
2
1
VS = ± 2.5V RL = 100k DISTORTION ≤ 1%
0
0 8 12 16 20 24 28 32 TOTAL SUPPLY VOLTAGE (V)
AV = 1
4
30
10
125
5
VS = ± 2.5V
OUTPUT SWING (VP-P)
OVERSHOOT (%)
TA = 25°C
100
Undistorted Output Swing vs Frequency, VS = ±2.5V
60
3
50 25 75 0 TEMPERATURE (°C)
1492/93 G06
70 TA = 125°C
4
2
Capacitive Load Handling
AV = –2 RL = 10k
0
VS = ±15V
1492/93 G05
Slew Rate vs Supply Voltage
2
3
30 20
1492/93 G04
4
AV = – 2 RL = 10k
TA = 25°C
SLEW RATE (V/µs)
70
Slew Rate vs Temperature
5.5
PHASE MARGIN (DEG)
120
GAIN-BANDWIDTH PRODUCT (MHz)
80
1492/93 G03
Gain-Bandwidth Product, Phase Margin vs Supply Voltage
Voltage Gain, Phase vs Frequency
VOLTAGE GAIN (dB)
25
0 – 400 –300 –200 –100 0 100 200 300 400 INPUT OFFSET VOLTAGE (µV)
0 – 2.5 – 2 –1.5 –1 – 0.5 0 0.5 1 1.5 2 2.5 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
1492/93 G01
SLEW RATE (V/µs)
30
5
0 50 100 150 200 –200 –150 –100 – 50 0 INPUT OFFSET VOLTAGE (µV)
1
VS = ±15V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
35
PERCENT OF UNITS (%)
40
100 1000 CAPACITIVE LOAD (pF)
10000 1492/93 G08
1k
10k 100k FREQUENCY (Hz)
1M 1492/93 G09
7
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS U W
Undistorted Output Swing vs Frequency, VS = ±15V AV = –1
20 15 10 5 0
VS = ±15V RL = 100k DISTORTION ≤ 1% 10k FREQUENCY (Hz)
1k
1
5000
VS = 5V, 0V VOUT = 3VP-P RL = 2k
OPEN-LOOP VOLTAGE GAIN (V/mV)
OUTPUT SWING (VP-P)
25
TOTAL HARMONIC DISTORTION AND NOISE (%)
30 AV = 1
Open-Loop Voltage Gain vs Supply Voltage
Total Harmonic Distortion and Noise vs Frequency
0.1
0.01
AV = 10
AV = 1
0.001
100
10
1k 10k FREQUENCY (Hz)
TA = 125°C 1000
0
0
4
8 12 16 20 24 28 32 36 40 TOTAL SUPPLY VOLTAGE (V) 1492/93 G12
5 1492/93 G13
2.5
Voltage Gain vs Load Resistance 100000
VS = 5V, 0V
OPEN-LOOP VOLTAGE GAIN (V/mV)
4
POSITIVE OUTPUT SATURATION, V + – VOUT (V)
INPUT, 5µV/DIV
RL = 2k
2 3 OUTPUT (V)
2000
Positive Output Saturation Voltage vs Load Current
RL = 5k
1
TA = 25°C
1492/93 G11
Open-Loop Gain, VS = 5V
0
3000
100k
1492/93 G10
TA = – 55°C
4000
0.0001
100k
RL = 2k
2.0
1.5
1.0 T = –55°C A 0.5 TA = 125°C 0 – 0.001
– 0.01
TA = 25°C –1 – 10 – 0.1 LOAD CURRENT (mA)
TA = 25°C
10000
VS = ±15V
1000
VS = 5V, 0V
100
10
– 100
0
2
4 6 8 LOAD RESISTANCE (kΩ)
1492/93 G15
1492/93 G14
Negative Output Saturation Voltage vs Load Current
Open-Loop Gain, VS = ±15V
RL = 5k
– 10
0 OUTPUT (V)
10 1492/93 G16
Channel Separation vs Frequency 130
VS = 5V, 0V
100
10
TA = 125°C
110 100 90 80 70
TA = 25°C, – 55°C 1 0.001
60 0.01
0.1 1 10 LOAD CURRENT (mA)
100
1492/93 G17
8
VS = ±15V
120
CHANNEL SEPARATION (dB)
RL = 2k
NEGATIVE OUTPUT SATURATION (mV)
INPUT, 5µV/DIV
1000
10
1k
10k
100k 1M FREQUENCY (Hz)
10M 1492/93 G18
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS U W
Output Short-Circuit Current vs Temperature
Output Impedance vs Frequency 1000
70
OUTPUT IMPEDANCE (Ω)
VS = ± 2.5V SINKING 60 VS = ±15V SOURCING OR SINKING
50
40
5V Small-Signal Response
VS = ± 2.5V
100 20mV/DIV
VS = ± 2.5V SOURCING
AV = 100
10
AV = 10
1
30 –50 –25
50 25 0 75 TEMPERATURE (°C)
100
125
0.1 10k
100k 1M FREQUENCY (Hz)
1492/93 G19
10M 1492/93 G20
5V Large-Signal Response
±15V Small-Signal Response
2µs/DIV
1492/93 G22
20mV/DIV
500mV/DIV
5V Large-Signal Response
500mV/DIV VS = 5V AV = 1
VS = 5V AV = – 1 RF = RG = 2k
±15V Large-Signal Response
VS = ±15V AV = 1
1492/93 G23
2µs/DIV
VS = ±15V
8
5V/DIV
OUTPUT STEP (V)
6
5µs/DIV
1492/93 G25
VS = ±15V AV = – 1 RF = RG = 2k
1492/93 G24
500ns/DIV
Settling Time to 1mV vs Output Step
±15V Large-Signal Response 10
VS = ±15V AV = 1
1492/93 G21
500ns/DIV
VS = 5V AV = 1
AV = 1
5V/DIV
OUTPUT SHORT-CIRCUIT CURRENT (mA)
80
INVERTING
4
NONINVERTING
2 0 –2 –4 –6
5µs/DIV
NONINVERTING
1492/93 G26
–8
INVERTING
–10 0
1
3 4 2 SETTLING TIME (µs)
5
6
1492/93 G27
9
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS U W
Supply Current vs Temperature
Supply Current vs Supply Voltage
VS = ±15V
0.45 VS = 5V, 0V 0.35
0.25 – 50 – 25
0
50 75 25 TEMPERATURE (°C)
100
10
0.8
0.6
TA = 125°C
0.4
TA = 25°C TA = – 55°C
0.2
0
1
3 2 4 SUPPLY VOLTAGE (V)
1492/93 G28
2
VS = ± 2.5V
0 VS = ±15V
–2 –4 –6
–10
5
10 20 30 40 50 60 70 80 90 100 TIME (SEC)
0
1492/93 G30
Input Bias Current vs Common Mode Voltage 20
VS = 5V, 0V
Common Mode Range vs Temperature V+
VS = 5V, 0V
0
60 55 50 IOS 45 + IB – IB
– 40 TA = – 55°C
– 60 – 80
TA = 125°C
–100 –120 –140 –160
V+ – 1
V+ – 2 V– + 2
V–
TA = 25°C
–180
35
COMMON MODE RANGE (V)
INPUT BIAS CURRENT (nA)
– 20
40
6 4
1492/93 G29
Input Bias Current vs Temperature 65
N8 PACKAGE RL = ∞
8
–8 0
125
CHANGE IN OFFSET VOLTAGE (µV)
0.55
INPUT BIAS CURRENT (nA)
Warm-Up Drift vs Time
1.0 SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
0.65
– 200 30 – 50 – 25
50 25 75 0 TEMPERATURE (°C)
100
– 220
125
0 2 3 1 COMMON MODE VOLTAGE (V)
–1
2.0 1.8 1.6
VOLTAGE NOISE
14
1.4
12
1.2
10
1.0
8
0.8
6
0.6
4
0.4
CURRENT NOISE
2
0.2
0 10
100 1k FREQUENCY (Hz)
0 10k 1492/93 G34
10
100
COMMON MODE REJECTION RATIO (dB)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
VS = ±15V TA = 25°C
Common Mode Rejection Ratio vs Frequency INPUT NOISE CURRENT DENSITY (pA/√Hz)
16
25 50 75 0 TEMPERATURE (°C)
125
Input Referred Power Supply Rejection Ratio vs Frequency 120
VS = ± 2.5V
80
60
40
20
0 10k
100
1492/93 G33
POWER SUPPLY REJECTION RATIO (dB)
Input Noise Current, Noise Voltage Density vs Frequency 20
– 25
1492/93 G32
1492/93 G31
18
V– – 1 – 50
4
VS = ±15V AV = 100
100
80
60
POSITIVE SUPPLY
40
NEGATIVE SUPPLY
20
100k 1M FREQUENCY (Hz)
10M 1492/93 G35
1k
10k
100k 1M FREQUENCY (Hz)
10M 1492/93 G26
LT1492/LT1493 U
W
U
U
APPLICATIONS INFORMATION Supply Voltage The LT1492/LT1493 op amps are fully functional and all internal bias circuits are in regulation with 2.1V of supply. The amplifiers will continue to function with as little as 1.6V, although the input common mode range and the phase margin are about gone. The minimum operating supply voltage is guaranteed by the PSRR tests that are done with the input common mode equal to 500mV and a minimum supply voltage of 2.5V. The positive supply pin of the LT1492/LT1493 should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads and for good settling time, an additional 4.7µF capacitor should be used. When using split supplies, the same is true for the negative supply pin. Power Dissipation The LT1492/LT1493 combine high speed and large output drive in small packages. Because of the wide supply voltage range, it is possible to exceed the maximum junction temperature under certain conditions. Maximum junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows: LT1492CN8: TJ = TA + (PD • 130°C/W) LT1492CS8: TJ = TA + (PD • 190°C/W) LT1493CS: TJ = TA + (PD • 150°C/W) Worst-case power dissipation occurs at the maximum supply current and when the output voltage is at 1/2 of either supply voltage (or the maximum swing if less than 1/2 supply voltage). For each amplifier PDMAX is: PDMAX =
(V +
– V –)(I
+ 2 SMAX) + (V /2) /RL
Example: LT1493 at 70°C, VS = ±15V, RL = 1k PDMAX = (30V)(930µA) + (7.5V)2/1kΩ = 84.2mW TJMAX = 70°C + (4 • 84.2mW)(150°C/W) = 121°C Inputs Typically, at room temperature, the inputs of the LT1492/ LT1493 can common mode 400mV below ground (V –) and to within 1.2V of the positive supply with the amplifier
still functional. However, the input bias current will shift as shown in the characteristic curves. For full precision performance, the common mode range should be limited between ground (V –) and 1.5V below the positive supply. When either of the inputs is taken below ground (V –) by more than about 700mV, that input current will increase dramatically. The current is limited by internal 100Ω resistors between the input pins and diodes to each supply. The output will remain low (no phase reversal) for inputs 1.3V below ground (V –). If the output does not have to sink current, such as in a single supply system with a 1k load to ground, there is no phase reversal for inputs up to 8V below ground. There are no clamps across the inputs of the LT1492/ LT1493 and therefore each input can be forced to any voltage between the supplies. The input current will remain constant at about 50nA over most of this range. When an input gets closer than 1.5V to the positive supply, that input current will gradually decrease to zero until the input goes above the supply, then will increase due to the previously mentioned diodes. If the inverting input is held more positive than the noninverting input by 200mV or more, while at the same time the noninverting input is within 300mV to ground (V –), then the supply current will increase by 1mA and the noninverting input current will increase to about 10µA. This should be kept in mind in comparator applications where the inverting input stays above ground (V –) and the noninverting input is at or near ground (V –). Output The output of the LT1492/LT1493 will swing to within 0.65V of the positive supply and to within 3mV of the negative supply with no load. Under loaded conditions see the Typical Performance curves for the output saturation voltage characteristics. The output of the LT1492/LT1493 has reverse-biased diodes to each supply. If the output is forced beyond either supply, unlimited currents will flow. If the current is transient and limited to several hundred milliamps, no damage will occur.
11
LT1492/LT1493
U
W
U
U
APPLICATIONS INFORMATION Feedback Components
Comparator Applications
Because the input currents of the LT1492/LT1493 are less than 100nA, it is possible to use high value feedback resistors to set the gain. However, care must be taken to insure that the pole that is formed by the feedback resistors and the input capacitance does not degrade the stability of the amplifier. For example, if a single supply, noninverting gain of 2 is set with two 62k resistors, the LT1492/LT1493 will probably oscillate. This is because the amplifier goes open-loop at 1MHz (6dB of gain) and has 50° of phase margin. The feedback resistors and the 10pF input capacitance generate a pole at 500kHz that introduces 63° of phase shift at 1MHz! The solution is simple, lower the values of the resistors or add a feedback capacitor of 10pF or more.
Sometimes it is desirable to use an op amp as a comparator. When operating the LT1492/LT1493 on a single 3.3V or 5V supply, the output interfaces directly with most TTL and CMOS logic. The response time of the LT1492/LT1493 is a strong function of the amount of input overdrive as shown in the following photos. These amplifiers are unity-gain stable op amps and not fast comparators, therefore, the logic being driven may oscillate due to the long transition time. The output can be speeded up by adding 20mV or more of hysteresis (positive feedback), but the offset is then a function of the input direction. Comparator Response (+) 20mV, 10mV, 5mV, 2mV Overdrives
Capacitive Loading
Maximum Capacitive Load vs Load Current
OUTPUT (V)
2
0 100 0 VS = 5V RL = ∞
SOURCING SINKING VS = ± 2.5V
1492/93 AI02
VS = ±15V 4 OUTPUT (V)
VS = ± 2.5V
100
VS = ±15V 10
0.1
1 10 LOAD CURRENT (mA)
2
0
100 1492/93 AI01
100 0 VS = 5V RL = ∞
12
20µs/DIV
Comparator Response (–) 20mV, 10mV, 5mV, 2mV Overdrives
1000
INPUT (mV)
MAXIMUM CAPACITIVE LOAD (pF)
10000
4
INPUT (mV)
The LT1492/LT1493 are optimized for low voltage, single supply operation. The Maximum Capacitive Load vs Load Current typical performance curve shows the circuit performance without any load resistance. When the output is sinking current or driving heavy loads with high supplies, capacitive load handling is degraded.
20µs/DIV
1492/93 AI02
LT1492/LT1493
W
W
SI PLIFIED SCHE ATIC V+ I1
I4
I3
I2
I6
I5
Q13
BIAS
CM
Q14
Q4
Q3 –IN
Q15
+IN Q1
Q11
Q2
OUT RF
Q7
Q12
CF Q10
Q8 Q5
Q9
Q6
Q16 CO
I7
I8
CI V– 1492/93 SS
U
TYPICAL APPLICATIONS 1A Voltage-Controlled Current Source
1A Voltage-Controlled Current Sink V+
V+ 1Ω 1k
V+
RL
1k 1k
200pF
–
VIN
VIN
100Ω
1/2 LT1492
1k
1/2 LT1492
Si9430DY P-CHANNEL
+
–
IOUT V IOUT = IN 1Ω tr < 1µs
IOUT
+
100Ω
Si9410DY N-CHANNEL
100pF 1k
RL V IOUT = IN 1Ω tr < 1µs
1492/93 TA05
1Ω 1492/93 TA06
Ground Current Sense Amplifier V+ 5V 0.1µF
LOAD
+ 1/2 LT1492 IIN
VO = 1V/A
– 0.05Ω
1910Ω 100Ω
OFFSET ≤ 3.6mA BANDWIDTH = 250kHz t r = 1µs
100pF 1492/93 TA07
13
LT1492/LT1493
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8
7
6
5
1
2
3
4
0.255 ± 0.015* (6.477 ± 0.381)
0.300 – 0.325 (7.620 – 8.255)
0.065 (1.651) TYP
0.009 – 0.015 (0.229 – 0.381)
(
+0.635 –0.381
0.125 (3.175) MIN
0.005 (0.127) MIN
+0.025 0.325 –0.015 8.255
0.130 ± 0.005 (3.302 ± 0.127)
0.045 – 0.065 (1.143 – 1.651)
)
0.018 ± 0.003 (0.457 ± 0.076)
0.100 ± 0.010 (2.540 ± 0.254)
0.015 (0.380) MIN
N8 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8
7
6
5
0.150 – 0.157** (3.810 – 3.988)
0.228 – 0.244 (5.791 – 6.197)
1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254)
0.053 – 0.069 (1.346 – 1.752) 0°– 8° TYP
0.016 – 0.050 0.406 – 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
14
0.014 – 0.019 (0.355 – 0.483)
2
3
4
0.004 – 0.010 (0.101 – 0.254)
0.050 (1.270) TYP
SO8 0996
LT1492/LT1493 U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S Package 16-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.386 – 0.394* (9.804 – 10.008) 16
15
14
13
12
11
10
9
0.150 – 0.157** (3.810 – 3.988)
0.228 – 0.244 (5.791 – 6.197)
1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254)
2
3
4
5
6
0.053 – 0.069 (1.346 – 1.752)
0.014 – 0.019 (0.355 – 0.483)
8
0.004 – 0.010 (0.101 – 0.254)
0° – 8° TYP
0.016 – 0.050 0.406 – 1.270
7
0.050 (1.270) TYP
S16 0695
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1492/LT1493
U
TYPICAL APPLICATION Single Supply 100kHz 4th Order Butterworth Filter
Frequency Response 10
100pF
11.3k
6.81k VIN
330pF
–
0
5.23k 5.23k
10.2k
–10 –20
–
1/2 LT1492
+
V+
47pF
1/2 LT1492
1000pF
VOUT
+ V +/2
1492/93 TA03
GAIN (dB)
6.81k
–30 –40 –50 –60 –70 –80 –90 100
1k
10k 100k FREQUENCY (Hz)
1M
10M
1492/93 TA04
RELATED PARTS PART NUMBER ®
DESCRIPTION
COMMENTS High DC Accuracy, 10 µV VOS(MAX) , 100nV/ °C Drift, 1MHz GBW, 1V/ µs Slew Rate, Max Supply Current 2.2mA
LTC 1152
Rail-to-Rail Input and Output, Zero-Drift Op Amp
LT1211/LT1212
Dual/Quad 14MHz, 7V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275 µV VOS(MAX) , 6µV/°C Max Drift, Max Supply Current 1.8mA per Amplifier
LT1213/LT1214
Dual/Quad 28MHz, 12V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275 µV VOS(MAX) , 6µV/°C Max Drift, Max Supply Current 3.5mA per Amplifier
LT1215/LT1216
Dual/Quad 23MHz, 50V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 450 Max Supply Current 6.6mA per Amplifier
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475 µV VOS(MAX) , 400kHz GBW, 0.13V/ µs Slew Rate, Max Supply Current 520 µA per Amplifier
LT1490/LT1491
Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps
Max Supply Current 50 µA per Amplifier, 200kHz GBW, 0.07V/ µs Slew Rate, Operates with Inputs 44V Above V – Independent of V +
LT1498/LT1499
Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps
TM
µV VOS(MAX) ,
475µV VOS(MAX) , 10MHz GBW, 6V/ µs Slew Rate, Max Supply Current 2.2mA per Amplifier
C-Load is a trademark of Linear Technology Corporation.
16
Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507 ● TELEX: 499-3977 ● www.linear-tech.com
14923f LT/TP 1097 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1997
