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| NJM2542 VIF/SIF Demodulator DESCRIPTION The NJM2542 is a VIF/SIF demodulator especially designed for TV and VCR based on the NTSC system. FM-PLL(Phase Locked Loop) detector reduces the number of pins and external parts, for efficient use of set space. FEATURES * Operating Voltage 5V * Alignment-free Automatic Frequency Tuning * Alignment-free FM-PLL Demodulator * Intercarrier type * Bipolar Technology * Package Outline: SSOP20 NJM2542V PACKAGE OUTLINE BLOCK DIAGRAM AGCFLT1 AFTOUT RFAGC ADJ RFAGC OUT 20 19 18 17 16 15 14 13 12 11 AGC AFT IFAMP SVCO APC EQAMP DET AFAMP FMDET LIM VCO 1 EQOUT 2 APCFLT 3 EQIN 4 V+ 5 VCOL1 6 VCOL2 7 VREF 8 VDETOUT 9 AGCFLT2 10 LIMIN AFOUT AFNFB IFIN2 IFIN1 GND EQ -1- NJM2542 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Supply Voltage Vcc Power Dissipation PD Operating Temperature Range Topr Storage Temperature Range Tstg * Test IC soldered on PC board RECOMMENDED OPERATING VOLTAGE RANGE Parameter Condition Operating Voltage ELECTRICAL CHARACTERISTICS Standard Test Conditions: (TA =25C,Vcc=5V,IF=45.75MHz/90dBuV,IF IN has 1:1Transformer instead of SAW filter.) Parameter Condition Symbol Min. Typ. AFT-Defeat Supply Current Icc 51 IFGR-MAX(AGCFLT=GND) VIF Section (45.75MHz/90dBuV) No IF Signal Video Output Level (DC) VDC 3.6 FGR-MAX(AGCFLT=GND) Video Output Level Video : 100% White,87.5% Mod Vo 1.5 1.9 Video Bandwidth -3dB Point fvc 7 Video S/N VIDEO:100% White,87.5%Mod Video S/N 50 56 Intermodulation P/C/S=1/-10/-10dB IM 34 40 Differential Gain DG 2 Differential Phase DP 2 Input Signal Voltage Sensitivity -3dB Point VINMIN 44 Maximum Input signal Voltage VS Ratio (>24%,<34%) VINMAX 101 105 IF Gain Control Range VINMAX-VINMIN GR 49 61 RF AGC Maximum Voltage IFGR-MAX(AGCFLT=GND) VRAH 4.3 4.9 RF AGC Minimum Voltage IFGR-MIN(AGCFLT= V+) VRAL 0 0.03 Picture Carrier Capture Range 1 CL-U 1.3 Picture Carrier Capture Range 2 CL-L 3.5 AFT Sensivity Sf 20 30 AFT Maximum Voltage VAFH 4.2 4.9 AFT minimum Voltage VAFL 0 0.05 Sync Level VOSYNC 1.35 AFTOUT=2.5V VCO Frequency Range FVCOWB 250 Center=45.65MHz SIF Section(SIF=4.5MHz/90dBuV) Audio Output DC Voltage LIMIN=4.5MHz CW VDCA 1.8 2.2 Audio Output LIMIN=4.5MHz FM25kHz dev VAFO 390 540 Total Harmonic Distortion LIMIN=4.5MHz FM25kHz dev THDAF 0.2 Input Limiting Voltage Sensivity LIM 38 AM Rejection Ratio FM25kHzDEV :AM30% AMR 50 56 Audio S/N De-Emphasis: ON AF S/N 56 Max. Unit mA Symbol Vcc Min. 4.75 Typ. 5.0 (TA=25C) Max. Unit 5.25 V (TA=25C) Unit V mW C C Ratings 6 *600 -20 to +80 -40 to +150 2.3 50 7 7 52 5.0 0.5 5.0 0.5 2.6 770 1.0 - V Vp-p MHz dB dB % deg dBuV dBuV dB V V MHz MHz mV/kHz V V V kHz V mVrms % dBuV dB dB -2- NJM2542 PINNING Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol EQOUT APCFLT EQIN V+ VCOL1 VCOL2 VREF VDETOUT AGCFLT2 LIMIN AFOUT AFNFB AGCFLT1 RFAGCOUT GND IFIN1 IFIN2 RFAGCADJ AFTOUT EQ Description Equalizer AMP Output APC Filter (PLL loop Filter) Equalizer AMP Input Power Supply VCO Coil 1 VCO Coil 2 Reference Voltage for Audio Video Demodulator Output AGC Filter 2 Limiter (sound intercarrier) Input Audio Output Audio High Pass Filter AGC Filter 1 RF AGC Output GND IF Differential Input 1 IF Differential Input 2 RF AGC Adjustment AFT Output Equalizer -3- NJM2542 TEST CIRCUIT AFT-OUT RFAGC-OUT Audio-OUT V+ IF-IN V+ 100k 50kVR Saw Filter 100k 10n 10n 100k 100k 10n 10n 10n 0.22u + 1u 2.4k 33n EQ 20 19 18 17 16 15 14 13 12 11 AGC AFT IFAMP SVCO APC EQAMP DET AFAMP FMDET LIM VCO 1 EQ -OUT 0.22u 47 Video OUT 2 EQ -IN 3 V+ 4 5 27CH 6 7 VDET -OUT 10n 8 9 10 LIM-IN 10n 39CH 10n + 10n 10n 100u 12u VCO COIL 470 1k 200 360 T4.5C SFE4.5C -4- NJM2542 TYPICAL CHARACTERISTICS Standard Test Conditions: (TA=25C,Vcc=5V,IF=45.75MHz/90dBuV, IF IN has 1:1Transformer instead of SAW filter.) VIDEO S/N 60 10 DG DP 8 50 DG[%] / DP[deg] VIDEO S/N [dB] 6 VIDEO DG/DP 40 4 30 2 20 -60 -50 -40 -30 -20 -10 0 10 IF Level [dBm ] VIDEO Chrom a/920K_Beat 50 0 -60 -50 -40 -30 -20 -10 0 10 IF Level [dBm ] AUDIO S/N / BUZZ 60 Chroma/920K_Beat [dB] AUDIO S/N / BUZZ [dB] 40 50 40 S/N BUZZ(SMPTE) 30 30 20 20 10 10 0 -60 -50 -40 -30 -20 -10 0 10 -70 -60 -50 -40 -30 -20 -10 0 IF Level [dBm ] AF Level P/S [dB] THD 3 0 600 500 AF Level [mVrms] 2 400 THD [%] 1 200 0 -80 -60 -40 SIF [dBm ] -20 0 2 3 4 SIF [MHz] 5 6 7 300 100 -5- MEMO [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. |
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