Rf Modulator For Uhf Band

Transcript

NJM2259 RF Modulator for UHF Band „ DESCRIPTION The NJM2259 is a RF modulator IC especially designed for UHF „ PACKAGE OUTLINE band RF modulator and consists of video clamp circuit, white clip circuit, video AM modulator and audio FM modulator, built into one chip. NJM2259M „ FEATURES • Operating Voltage 5V • Picture-to-sound ratio is adjustable • Audio ripple is decreased by two internal regulators • Audio input circuit with low shock noise • Carrier-off switch function on chip • Bipolar Technology • Package Outline : DMP16 AUDIO IN TANK 1 TANK 2 P/S Adj. VCC 1 VIDEO IN GND 1 RF OUT „ BLOCK DIAGRAM 16 15 14 13 12 11 10 9 AUDIO SUBCARRIER MODULATOR VIDEO CLAMP REGULATOR LPF WHITE CLIP RF MIXER 1 2 3 4 5 6 7 8 GND 2 OSC B1 OSC E1 OSC E2 OSC B2 VCC 2 VCC 3 REGULATOR GND 3 RF OSCILLATOR -1- NJM2259 „ ABSOLUTE MAXIMUM RATINGS Parameter Symbol Supply Voltage VCC Power Dissipation PD Input Voltage Operating Temperature Range Storage Temperature Range VI Topr Tstg Ratings 7 300 (TA=25°C) Unit V mW -0.3 to VCC -20 to +75 -40 to +125 „ RECOMMENDED OPERATING VOLTAGE RANGE Parameter Condition Operating Voltage Symbol VCC „ ELECTRICAL CHARACTERISTICS Parameter Condition Symbol Operating Current No video/audio input signal ICC Video Output Level VO Video input Signal (Pin11)=0.5VPP (Note 1) Video Modulation Depth mp Video input Signal (Pin11)=0.5VPP (Note 1) Video Limiter Modulation mpmax Video input Signal (Pin11)=0.5VPP Depth (Note 1) Video input signal (Pin11)=0.5VPP Differential Gain DG Staircase Video input Signal (Pin11)=0.5VPP DP Differential Phase Staircase Picture-to-sound Ratio PS Video input Signal (Pin11)=0.5VPP (Note 1) Sound FM Modulation Audio input Signal (Pin16)=70mVPP ms Depth (Note 1) 100%=±50kHz dev. Audio Distortion ms=100%,1kHz sine wave THD Audio Signal-to-noise ms=100%,1kHz sine wave ASN Ratio Video input Signal (Pin11)=1VPP Maximum Sound FM Audio input Signal (Pin16)=500mVPP msmax Modulation 1kHz sine wave V °C °C Min. 4.5 Typ. 5.0 Min. 18 Max. 5.5 (TA=25°C) Unit V (VCC=5V,TA=25°C) Typ. Max. Unit 30 32 mA (73) 78 (83) dBu (60) 75 (90) % (80) 94 (98) % - ±3 - % - ±3 - deg (10) 13 (16) dB (85) 100 (115) % - 0.3 - % - 60 - dB - 700 - % (Note 1) Because AC characteristics largely depends on application circuit, DC test is applied these parameters. -2- NJM2259 „ TEST CIRCUIT AUDIO IN VIDEO IN 6p 68p P/S Adj. VCC3 VIDEO IN GND1 REG OUT OSC E2 OSC B2 VCC2 VCC3 9 OSC E1 10 TANK2 11 OSC B1 12 TANK1 13 GND2 14 AUDIO IN 15 100p 1u GND3 16 + RF OUT 1 2 3 4 5 6 7 8 3p 100p 22p 50k 1p 1p 3p VCC 100p 22p 50k VCO -3- NJM2259 „ TERMINAL CHARACTERISTICS Typ. DC No. Symbol Voltage (V) -4- Equivalent Circuit Function 1 GND 3 - GND for RF OSC AMP 2 GND 2 - GND for RF OSC 3 4 5 6 OSC B1 OSC E1 OSC E2 OSC B2 2.55 1.75 1.75 2.55 RF Oscillator 7 VCC 2 - 8 VCC 3 - 9 RF OUT 3.95 RF Mixer Output 10 GND 1 - GND Terminal except for RF Oscillator 11 VIDEO IN 1.70 Video Signal Input RF OSC Regulator Power Supply RF Mixer Power Supply NJM2259 No. Symbol Typ. DC Voltage (V) 12 VCC 1 - 13 P/S Adj. 3.55 TANK 1: H 2.80 TANK 1: L Equivalent Circuit Function Power Supply Picture-to-sound Ratio Adjust H : 3.60 14 TANK 2 L : 2.85 H : 3.60 15 Sound FM Modulation Circuit TANK 1 L : 2.85 16 AUDIO IN - Audio Signal Input -5- NJM2259 „ TYPICAL CHARACTERISTICS TA=25°C ICC vs VCC VIDEO OUTPUT LEVEL vs VCC 84 50 45 82 40 Vo [ dBuV ] ICC [ mA ] 35 30 25 20 80 78 15 10 76 5 0 74 4.0 4.5 5.0 5.5 6.0 6.5 7.0 4.0 4.5 5.0 VCC [ V ] 5.5 6.0 6.5 7.0 VCC [ V ] VIDEO MODULATION DEPTH vs VCC AUDIO FM MODULATION DEPTH vs VCC 125 80 120 115 78 76 βb [ % ] mp [ % ] 110 74 105 100 95 90 85 72 80 70 75 4.0 4.5 5.0 5.5 VCC [ V ] -6- 6.0 6.5 7.0 4.0 4.5 5.0 5.5 VCC [ V ] 6.0 6.5 7.0 NJM2259 „ OUTLINE DRAWING DMP16 [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -7- Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJM2259M NJM2259M-TE1