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| NJM2259 RF Modulator for UHF Band DESCRIPTION The NJM2259 is a RF modulator IC especially designed for UHF 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 BLOCK DIAGRAM AUDIO IN VIDEO IN PACKAGE OUTLINE 16 15 14 13 12 11 10 AUDIO SUBCARRIER MODULATOR VIDEO CLAMP REGULATOR LPF WHITE CLIP RF MIXER RF OSCILLATOR REGULATOR 1 GND 3 2 GND 2 3 OSC B1 4 OSC E1 5 OSC E2 6 OSC B2 7 VCC 2 VCC 3 RF OUT P/S Adj. TANK 1 TANK 2 GND 1 VCC 1 9 8 -1- NJM2259 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Supply Voltage VCC Power Dissipation PD Input Voltage Operating Temperature Range Storage Temperature Range VI Topr Tstg (TA=25C) Unit V mW V C C (TA=25C) Unit V Ratings 7 300 -0.3 to VCC -20 to +75 -40 to +125 RECOMMENDED OPERATING VOLTAGE RANGE Parameter Condition Operating Voltage Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 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 Min. 18 (73) (60) (80) (10) (85) - (VCC=5V,TA=25C) Typ. Max. Unit 30 32 mA 78 75 94 3 3 13 100 0.3 60 700 (83) (90) (98) (16) (115) dBu % % % deg dB % % dB % (Note 1) Because AC characteristics largely depends on application circuit, DC test is applied these parameters. -2- NJM2259 TEST CIRCUIT AUDIO IN VIDEO IN RF OUT 68p 6p + 1u 100p 16 AUDIO IN 15 TANK1 14 TANK2 13 P/S Adj. 12 VCC3 11 VIDEO IN 10 GND1 9 REG OUT VCC3 OSC B1 OSC E1 OSC E2 OSC B2 GND3 GND2 1 2 3 3p 100p 4 1p 1p 5 3p 6 VCC2 7 8 VCC 100p 22p 22p 50k 50k VCO -3- NJM2259 TERMINAL CHARACTERISTICS Typ. DC No. Symbol Voltage (V) 1 2 GND 3 GND 2 - Equivalent Circuit Function GND for RF OSC AMP 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 8 VCC 2 VCC 3 - RF OSC Regulator Power Supply RF Mixer Power Supply 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 -4- NJM2259 No. 12 Symbol VCC 1 Typ. DC Voltage (V) 3.55 TANK 1: H 2.80 TANK 1: L H : 3.60 14 TANK 2 L : 2.85 H : 3.60 15 TANK 1 L : 2.85 Sound FM Modulation Circuit Equivalent Circuit Function Power Supply 13 P/S Adj. Picture-to-sound Ratio Adjust 16 AUDIO IN - Audio Signal Input -5- NJM2259 TYPICAL CHARACTERISTICS TA=25C ICC vs VCC 50 45 40 35 30 25 20 15 10 5 0 4.0 4.5 5.0 5.5 VCC [ V ] VIDEO MODULATION DEPTH vs VCC 80 78 mp [ % ] b [ % ] 76 74 72 70 4.0 4.5 5.0 5.5 VCC [ V ] 6.0 6.5 7.0 125 120 115 110 105 100 95 90 85 80 75 4.0 4.5 5.0 5.5 VCC [ V ] 6.0 6.5 7.0 6.0 6.5 7.0 74 4.0 4.5 5.0 5.5 VCC [ V ] AUDIO FM MODULATION DEPTH vs VCC 6.0 6.5 7.0 76 Vo [ dBuV ] ICC [ mA ] 80 78 82 84 VIDEO OUTPUT LEVEL vs VCC -6- 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- |
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