Video ICs Single chip Hi-Fi audio signal processor BH7802K The BH7802K incorporates the functions for a VHS audio signal processing system on a single chip. The circuits on the chip are a peak-noise reduction processor (PNR), an FM modulator / demodulator circuit, an I / O switcher, an automatic FM detector circuit, an FM bandpass filter, and a regulator circuit. Applications •VCR S •1)Features Operates off dual ± power supply which allows a large reduction in the number of coupling capacitors required. A built-in regulator makes it easy to construct a power supply system. 2) A two-line I2C bus control decoder circuit is provided, allowing the various IC modes to be set using serial control. 3) A four line input switcher is included (tuner, BS, and line 1 / 2). The output switcher can switch between STEREO, LEFT, and RIGHT, and Hi-Fi, MIX, and NORMAL, and a BS MONITOR function is also provided. The MIX AMP is AV-LINK compatible. 4) The PNR processor and FM modulator / demodulator circuit have reversed characteristics at recording and playback. In addition, the adjustment for carrrier frequency and FM deviation / playback level are common. 5) The built-in bandpass filter excels at attenuation of other channels, and can be directly coupled to the playback amplifier. The FM recording output block has a high-performance low-pass filter to produce sine wave output. 6) Slope-control-type FM-switching-noise compensation circuit. 7) Envelope detector circuit and noise-detector-type automatic FM detector circuit. 8) VCO that uses the color signal sub-carrier frequency fsc (NTSC: 3.579545MHz, PAL: 4.433619MHz) and auto-adjusting BPF circuit ensure stable adjustment with no fluctuation due to mounting stress or time. •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Power dissipation Symbol Limits Unit VCC 18, 36pin······························ 6.0 V VEE 39pin································· – 6.0 V VIN 5, 6, 32pin···························· 6.5 V VIN Pins other than the above···· 6.0 V Pd 850∗ mW Operating temperature Topr – 10 ~ + 70 °C Storage temperature Tstg – 55 ~ + 125 °C ∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C, when mounted on a 70mm × 70mm, t = 1.6mm glass epoxy board. 1 Video ICs BH7802K LINE2 R IN MUTE CTRL NORMAL OUT LINE L OUT LINE R OUT MIX OUT MIX ALC NORMAL IN NR TC R WTNG R NR EMPH R •Block diagram 33 32 31 30 29 28 27 26 25 24 23 MIX AMP LINE2 L IN 34 22 DC FB R PNR 21 FM REC OUT LINE AMP VREFP 35 FM OUT SW MODEM LINE AMP VCC 36 ERP 37 20 AUDIO HEAD SW PULSE IN 19 FM ALC D.O. COM. GND 38 18 VCCM REG LINE2L LINE2R BSL BSR VEE 39 LINE1 R IN 40 17 VCO FO ADJ VCO BPF AUTO ADJUST OUTPUT SWITCH FMBPF LINE1 L IN 41 15 GNDM ERM 42 ALC ENVE LOPE MODEM BS R IN 43 14 ENVE OUT / ADJ FLAG / Hi-Fi DET Hi-Fi DET INPUT 13 FM PB IN SWITCH DATA DECODER PNR 1 2 3 4 5 6 7 8 9 10 11 TUNER L IN TUNER M IN Hi-Fi ALC SCL SDA GNDD FSC IN NR TC L WTNG L NR EMPH L 12 DC FB L TUNER R IN BS L IN 44 2 16 BPF ADJ Video ICs BH7802K •Pin descriptions Pin No. Pin name 2, 1, 3 TUNER IN L, R, M Tuner input (L, R, M) 0.0V 150kΩ 4 Hi-Fi ALC ALC time constant setting for Hi-Fi audio 0.0V EF (NPN) ~ 200Ω 5 SCL CLOCK input for I2C bus control — B (PNP) 6 SDA DATA input for I2C bus control — B (PNP) 7 GNDD GND for serial control — — 8 FSC IN fSC input for VCO and BPF adjustment 0.0V 200kΩ NR TC L, R PNR attack and recovery time setting. Attack R: 530Ω, Recovery R: 6.5kΩ – 5.0V — 10, 24 WTNG L, R Waiting characteristic, treble time constant (External C = 0.022µF) 0.0V — 11, 23 NR EMPH L, R NR emphasis time constant setting (External C = 0.0047µF) 0.0V — 12, 22 DC FB L, R PNR operating reference potential point 0.0V 11.5kΩ 13 FM PB IN Playback FM input 660mVP-P Typ. Input coupling capacito (GND ~ VCC) 0.0V 100kΩ 14 ENVE OUT / ADJ FLAG / Hi-Fi DET EE: 0.8V FM Lch signal component envelope output / Hi-Fi DET output / ADJ FLAG output for ADJ PB: 1.0V 9, 25 Function Pin voltage I / O circuit EE: 50kΩ PB, ADJ: EF (NPN) 15 GNDM GND for PNR, MODEM and BPF 0.0V — 16 BPF f0 ADJ Center frequency adjustment for FM BPF 1.9V EF (NPN) ~ 200Ω 17 VCO f0 ADJ VCO control current setting 2.5V EF (NPN) 18 VCCM VCC for MODEM and BPF 5.0V — 19 FM ALC FM ALC time constant setting 0.0V EF (NPN) ~ 2.5kΩ 20 AHSWP IN Audio head switching pulse input — B (PNP) 21 FM REC OUT EE: recording FM output , sine wave output PB: FM BPF output monitor EE: 3.3V EF (NPN) ~ 200Ω 26 NORMAL IN Normal input 0.0V 100kΩ MIX ALC ALC time constant setting for mixer amplifier. Attack and recovery time setting 27 28 – 5.0V EF (NPN) ~ 500Ω MIX OUT Mixer amplifier output for RF converter 0.0V 30, 29 LINE L, R OUT Line output 0.0V EF (NPN) 330Ω 31 NORMAL OUT Normal output 0.0V EF (P-P) MUTE CTRL Line output mute control input — 3kΩ ( > 2.5V) LINE2 L, R IN LINE2 input (L, R) 0.0V 88kΩ 35 VREFP VCC / 2 reference voltage (power on detect and pre-charge functions) 2.5V 10kΩ 36 VCC VCC regulator 5.0V — 37 ERP VCC regulator error output 5.0V C (NPN) 38 GND I / O switch GND 0.0V — 39 VEE VEE regulator LINE1 IN L, R LINE1 input (L, R) ERM VEE regulator error output BS IN L, R BS input (L, R) 32 34, 33 41, 40 42 44, 43 – 5.0V 0.0V – 5.0V 0.0V — 88kΩ C (PNP) 88kΩ ∗ I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector. All numerical values are standardized values. 3 Video ICs BH7802K •Input / output circuits TUNER L / R / M IN (2, 1, 3pin) LINE1, LINE2, BS L / R IN (34, 33, 41, 40, 44, 43pin) VCC VCC – 2.0V – 2.0V 3k 58k 1 33 (2, 3pin) (34, 40, 41, 43, 44pin) 2.0V 150k 2.0V 30k VEE VEE GND GND LINE L / R OUT (30, 29pin) MIX OUT (28pin) VCC VCC 200 50 28 25k 330 5k 200 30 (29pin) 47k 11.56k 50 VEE VEE GND GND FM REC OUT (21pin) FM PB IN (13pin) VCC VCC 200 3.5V 200 50k 20p 2k 21 13 PB 3p 4 8k 12.5k 100k VEE VEE GND GND Video ICs BH7802K AHSWP IN (20pin) ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin) VCC VCC PB 200 42.5k 30k 5k 14 20 50k VEE VEE GND GND SCL (5pin) SDA (6pin) VCC VCC 30k 30k 5 6 90 3V 3V VEE VEE GND MUTE CTRL (32pin) FSC IN (8pin) 32 VCC VCC 2.5V 51k 10k 2k 2k 8 200 16k 100k 50k 50k 10k 100k VEE VEE GND GND 5 Video ICs BH7802K •Electrical characteristics (unless otherwise noted, Ta = 25°C, UNREG – V CC • Output switch control (W2D3, W2D4, W2D5) • BS L2 Through / LINE MUTE control (W2D6, W2D7) • LINE AMP gain control (W2D1, W2D2) • FM output control (W1D3) • FM OUT switch control (W1D4, W1D5, W1D6) • NTSC / PAL control (W1D8) • Recording MUTE (W1D7) • Hi-Fi PB MUTE (W2D8) • Normal input switch control (W3D4, W3D5) • Hi-Fi ALC control (W3D8) • ENVELOPE GAIN (Typ. / 4dB) control (W4D4) • FM detector level control (W4D1, W4D2) • ENVE characteristic control (W4D3) • FM TEST control (W4D6) • FM ALC control (W4D5) • MUTE control (pin 32) Signal frequency f = 1kHz • INPUT condition 1: TU IN VIN = – 20dBV, • INPUT condition 2: TU IN VIN = – 9.8dBV, • INPUT condition 3: TU IN VIN = – 2.0dBV, MODEM carrier frequency NTSC MODEM carrier frequency NTSC MODEM carrier frequency PAL MODEM carrier frequency PAL fsc NTSC fsc PAL 6 = + 10V, UNREG – VEE = – 10V) : STEREO : BS L2 Through / LINE MUTE OFF : Typ. ( + 9.8dB) : FM OUTPUT ON : FM REC output, MIX ratio 1 ( – 12.5dB) : NTSC : Recording MUTE : OFF : Hi-Fi MIX : OFF : Typ. : Typ. : FNORM detect, no ENVE output : OFF : ALC ON : L (MUTE) LINE1 / LINE2 / BS VIN = – 10.2dBV LINE1 / LINE2 / BS VIN = 0.0dBV LINE1 / LINE2 / BS VIN = 8.0dBV Lch 1.30MHz Rch 1.70MHz Lch 1.40MHz Rch 1.80MHz 3.579545MHz 4.433619MHz Video ICs BH7802K Parameter Symbol Min. Typ. Max. Unit Conditions Quiescent current (positive supply) EE IqPEE 30.0 40.0 53.0 mA EE MODE, after carrier frequency adjustment with no input Quiescent current (positive supply) PB IqPPB 40.0 54.0 72.0 mA PB MODE, carrier frequency adjustment FNORM, after BPF adjustment Quiescent current (negative supply) EE IqMEE – 20.0 – 15.0 – 11.0 mA EE MODE, after carrier frequency adjustment with no input Quiescent current (negative supply) PB IqMPB – 22.0 – 16.0 – 12.0 mA PB MODE, carrier frequency adjustment FNORM, after BPF adjustment Regulator pin voltage (positive) VCC 4.75 5.10 5.45 V — Regulator pin voltage (negative) VEE – 5.35 – 5.00 – 4.65 V — 〈REGULATOR〉 〈EE THROUGH〉 (INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R Line output level VOEE – 11.7 Channel balance (L / R) CBEE – 0.8 – 10.2 – 8.7 OUTPUT: LINE OUT L / R) dBV INPUT condition 1 0.0 0.8 dB INPUT condition 1 INPUT condition 1, ∗1 Distortion THDEE — 0.017 0.10 % Maximum output level VOMEE 8.3 10.7 — dBV THD = 1%, ∗1 dBV INPUT condition 2 ALC ON ALC level VALC ALC distortion Output residual noise + 2.8 + 4.8 + 6.8 THDALC — 0.03 0.25 VONEE — – 94.0 – 87.0 % INPUT condition 2, ∗1 ALC ON dBV Relevant input shorted to GND, ∗2 Crosstalk CTEE — – 88.0 – 70.0 dBV Relevant input: shorted to GND Non-relevant input: Input condition 2, ∗2 Muting level MTEE — – 103 – 90 dBV INPUT condition 2, ∗2 (INPUT: TU L / R, LINE1 L/R, LINE2 L / R, BS L / R, TU M IN Normal out output level VONORM 〈BS / L2 THROUGH〉 (INPUT: BS / L2 IN L / R VOBS VOL2 Output level – 21.5 OUTPUT: NORMAL OUT) – 20.0 – 18.5 – 11.7 – 10.2 – 8.7 THDBS THDL2 — 0.005 0.09 Output residual noise VONBS VONL2 — – 99.0 – 87.0 Line amplifier gain1 VOLINE1 + 8.8 + 9.8 + 10.8 VOMIX – 10.7 – 8.7 – 6.7 Distortion THDMIX — 0.08 0.50 MIX ALC level VALCMIX – 4.2 – 2.2 – 0.2 ∗1: B.W. = 0.4 to 30kHz ∗2: DIN dBV VIN = – 10.2dBV % dBV VIN = – 10.2dBV, ∗1 BS IN pin shorted to GND, ∗2 OUTPUT: LINE OUT L / R) 〈MIX AMP〉 (INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R Output level INPUT condition 1 L&R input together, ∗1 OUTPUT: LINE OUT L / R) Distortion 〈LINE AMP〉 (INPUT: NORMAL IN dBV dB VIN = – 20dBV OUTPUT: MIX OUT) dBV % dBV INPUT condition 1 L&R input together INPUT condition 1 L&R input together, ∗1 INPUT condition 2 L&R input together AUDIO 7 Video ICs BH7802K Parameter Symbol Min. Typ. Max. Unit Conditions 〈OUTPUTSW: Hi-Fi / NORMAL MIX MODE〉 (INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R, NORMAL IN OUTPUT: LINE OUT) Hi-Fi / NORMAL MIX level VHNMIX – 11.7 – 10.2 – 8.7 dBV INPUT condition 1 NORMAL IN: – 20dBV 〈MODEM REC MODE〉 (INPUT: TUNER IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R OUTPUT: FM REC OUT) NTSC carrier frequency PAL carrier frequency Frequency deviation Maximum frequency deviation FM output level Carrier 2nd harmonic Carrier 3rd harmonic Lch fNOL 1.2905 1.2975 1.3045 MHz Rch fNOR 1.6920 1.6990 1.7060 MHz Lch fPOL 1.3910 1.3980 1.4050 MHz Rch fPOR 1.7925 1.7995 1.8065 MHz Lch DEVL 43.0 49.0 55.0 ± kHz Rch DEVR 44.5 50.5 56.5 ± kHz Lch DEVMax.L 118 140 162 ± kHz Rch DEVMax.R 118 140 162 ± kHz Lch VOFML 300 355 410 mVP-P Rch VOFMR 310 365 420 mVP-P No input, after automatic adjustment No input, after automatic adjustment INPUT condition 1 INPUT condition 3 (f = 10kHz) FM OUT SW: FM L mode FM OUT SW: FM R mode Lch f2L — – 53.0 – 40.0 dB Rch f2R — – 48.0 – 40.0 dB Lch f3L — – 52.0 – 40.0 dB Rch f3R — – 55.0 – 40.0 dB Spectrum ratio of 2nd harmonic with respect to fundamental Lch: FM L mode, Rch: FM R mode Spectrum ratio of 3rd harmonic with respect to fundamental Lch: FM L mode, Rch: FM R mode – 12.5 – 10.5 dB Spectrum ratio 1.30MHz / 1.70MHz FM MIX ratio (FM MIX1 mode) fLR – 14.5 〈MODEM PB MODE〉 (INPUT: FM PB IN, OUTPUT: LINE OUT L / R) Carrier setting resistor, after BPF f0 djustmen, VIN = 660mVP-P, 1.30MHz, 1.70MHz MIX IN Demodulation output level 1 Lch VODL – 12.7 – 10.2 – 7.7 dBV DEVL = ± 50.0kHz, f = 1kHz Rch VODR – 12.7 – 10.2 – 7.7 dBV DEVR = ± 50.0kHz, f = 1kHz Lch VODL2 VODL – 10.0 VODL – 7.8 VODL – 5.6 dBV DEVL = ± 50.0kHz, f = 10kHz Rch VODR2 VODR – 10.0 VODR – 7.8 VODR – 5.6 dBV DEVR = ± 50.0kHz, f = 10kHz Lch THDDL — 0.12 0.35 % DEVL = ± 50.0kHz, f = 1kHz, ∗1 Rch THDDR — 0.13 0.35 % DEVR = ± 50.0kHz, f = 1kHz, ∗1 Lch VONDL — – 98.0 – 92.0 dBV Unmodulated Rch VONDR — – 98.0 – 92.0 dBV ∗2 Demodulation output level 2 Demodulation distortion Demodulation noise level 〈Recording→playback overall characteristics〉 (EE···INPUT: LINE IN L / R, OUTPUT: LINE OUT L / R) (PB···INPUT: FM PB IN, OUTPUT: LINE OUT L / R) Lch VRPL – 1.2 0.0 + 1.2 dB Line output recording / playback level difference Rch ∗1: B.W. = 0.4 to 30kHz 8 ∗2: DIN AUDIO VRPR – 1.2 0.0 + 1.2 dB Carrier frequency, after adjusting BPF EE mode: INPUT condition 1 PB mode: FM PB IN = 660mVP-P f = 1.30MHz, 1.70MHz 1: 1 MIX, The difference between the EE and PB line out levels when input is DEV = DEVL, R (the frequency deviation given above) Video ICs Parameter BH7802K Symbol Min. Typ. Max. Unit Conditions 〈FM BPF〉 (INPUT: FM PB IN, OUTPUT: BPF MONITOR L / R) BPF L / R level difference NTSC ∆VBPFN – 5.0 0.0 5.0 dB After automatic adjustment, NTSC f = 1.505MHz, VIN = 200mVP-P BPF L / R level difference PAL ∆VBPFP – 5.0 0.0 5.0 dB After automatic adjustment, PAL f = 1.605MHz, VIN = 200mVP-P 〈Lch, Rch mix input signal level 660mVP-P (RATIO 1: 1) 〉 NTSC Lch 1.30MHz insertion loss 1.15MHz attenuation 1.45MHz attenuation 1.70MHz attenuation ATTNLC – 14.1 – 11.1 – 8.1 dB 1.30MHz + 1.70MHz FM ALC ON ATTNL ATTNLC – 9.8 ATTNLC – 5.3 ATTNLC – 2.3 dB 1.15MHz + 1.70MHz ATTNLC – 8.1 ATTNLC – 5.0 ATTNLC – 2.5 dB 1.45MHz + 1.70MHz — — ATTNLC – 30.0 dB 1.30MHz + 1.70MHz 1.15 ATTNL 1.45 ATTNL 1.70 NTSC Rch 1.70MHz insertion loss 1.55MHz attenuation 1.85MHz attenuation 1.30MHz attenuation ATTNRC – 15.3 – 12.3 – 9.3 dB 1.30MHz + 1.70MHz FM ALC ON ATTNR ATTNRC – 8.8 ATTNRC – 5.7 ATTNRC – 3.4 dB 1.55MHz + 1.30MHz ATTNRC – 9.5 ATTNRC – 4.7 ATTNRC – 1.4 dB 1.85MHz + 1.30MHz — — ATTNRC – 30.0 dB 1.30MHz + 1.70MHz 1.55 ATTNR 1.85 ATTNR 1.30 PAL Lch 1.40MHz insertion loss 1.80MHz attenuation ATTPLC ATTPL 1.80 – 12.9 — – 9.9 — – 6.9 dB 1.40MHz + 1.80MHz ATTPLC – 30.0 dB 1.40MHz + 1.80MHz – 8.3 dB 1.40MHz + 1.80MHz ATTPRC – 30.0 dB 1.40MHz + 1.80MHz PAL Rch 1.80MHz insertion loss 1.40MHz attenuation ATTPRC ATTPR 1.40 – 14.3 — – 11.3 — 〈FNORM→Hi-Fi recovery delay circuit〉 Return delay time τFNDLY 110 125 140 ms Delay time from input of FM PB IN (1.30MHz, 1.70MHz 1: 1 MIX) 660mVP-P to rise of ENVE OUT AUDIO HEAD PULSE IN : f = 30Hz, 5VP-P, rectangular wave 〈Envelope output circuit〉 (INPUT: FM PB IN, OUTPUT: ENVE OUT) 0dB = 660mVP-P, 1.3MHz&1.70MHz MIX input Envelope output level SP0 VENVSP0 — 0 100 mV No signal, STANDARD MODE Envelope output level SP1 VENVSP1 2.08 2.58 3.08 V VIN = 0dB, STANDARD MODE Envelope output level SP2 VENVSP2 3.70 3.95 4.20 V VIN = + 10dB, STANDARD MODE Envelope output level EP1 VENVEP1 1.96 2.46 2.96 V VIN = – 4dB, + 4dB MODE 9 Video ICs Parameter BH7802K Symbol Min. Typ. Max. Unit Conditions L mode holding voltage VH5L 0.0 H mode holding voltage VH5H 2.5 — 0.5 V — — VCC V — L mode holding voltage VH6L 0.0 H mode holding voltage VH6H 2.5 — 0.5 V — — VCC V — MUTE holding voltage VH32L 0.0 — 1.0 V — DC MUTE holding voltage VH32H 3.9 — VCC V — 〈Control system mode holding voltage〉 CLOCK IN DATA IN MUTE CTRL 10 Video ICs BH7802K NORMAL IN MIX OUT LINE R OUT LINE L OUT 1k 22k 22k 22k MUTE CTRL NORMAL OUT •Measurement circuit 0.0047µ LINE2 R IN 1k 0.022µ 10µ 2.2M 47µ 4.7k VEE 1500p 1500p VEE S33 33 4.7k 31 30 29 28 27 26 25 24 23 100µ MIX AMP 34 LINE2 L IN 1k 32 22 PNR S34 0.01µ 35 21 100µ 4.7k FM OUT SW MODEM LINE AMP 36 VCC 20 37 19 D.O. COM. 38 18 47µ REG 27k LINE2L LINE2R BSL BSR 39 100µ 4.7k 40 LINE1 R IN 1k 17 VCO BPF AUTO ADJUST OUTPUT SWITCH 27k FMBPF 16 S40 4.7k 41 LINE1 L IN 15 S41 4.7k 42 ALC VEES MODEM 4.7k 43 4.7k 47k 13 SWITCH S43 DATA DECODER 44 BS L IN 14 Hi-Fi DET INPUT BS R IN ENVELOPE / Hi-Fi DET / AAA FLAG FM PB IN 100µ PNR 12 S44 1 2 3 4 5 6 7 8 9 1k S2 1k S3 10µ S1 2.2M 1k 47µ TUNER R IN 10 TUNER L IN 11 0.0047µ 1k ENVE LOPE 0.022µ 1k 1k AHSWP IN 0.022µ VCCS VEE FM REC OUT 10k LINE AMP 4.7µ FSC IN DATA TUNER M IN CLOCK VEE Fig.1 11 Video ICs BH7802K Circuit operation •Function table The BH7802K includes the following functions on one chip. No. Block name Main function 1 Regulator · ± 5V regulator (VCC, VEE) · Anti-pop circuit (ANTI-POP) 2 I2C BUS control · I2C 3 Input switcher · TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch 4 Output switcher 6 PNR processor 7 Modulator 8 FM detector control 9 FM BPF BUS data decoder Pin number Power supply 35 ~ 39, 42 UNREG-VCC: + 10V UNREG-VEE: – 10V GND: 38 5~7 · Line amplifier: + 9.8dB, + 10.3dB, + 11.3dB, + 15.0dB · STEREO / LEFT / RIGHT / 9 NORMAL switch · MIX ON / OFF switch · Mute switch · MIXER amplifier for RF converter (with ALC function) · BS / LINE2 through mode · 20kHz line low-pass filter (secondary LPF) · 20kHz PNR low-pass filter (secondary LPF) · PNR processor (MOA, CCA, WTNG, DET) · Emphasis / de-emphasis (EMPH / DEEMPH) · Switching noise slope-control type differential compensation circuit · FM modulation circuit (VCO, DEV) · FM demodulation / FM BPF MONITOR output switch (FMOUT SW) VCC3 (internal power supply) GND: 7 33, 34, 40, 41 43, 44 1~3 VCC (internally wired) VEE (internally wired) GND: 38 27 ~ 30 32 VCC (internally wired) VEE (internally wired) GND: 38 9 ~ 12 22 ~ 25 VCC (internally wired) VEE (internally wired) GND: 38 8, 14 17, 21 VCC: 18 VEE (internally wired) GND: 15 14, 20 VCC: 18 (internally wired) GND: 15 : FM MIX1 to 4, FM L, FM R, BPF L, BPF R 12 · Recording FM treble cutoff filter (FM LPF) · Over modulation limiter (AUDIO LIM) · Playback FM limiter (FM LIM) · VCO, BPF automatic adjustment circuit (AUTO AUDIO ADJUST) · NTSC / PAL switch function · Auto adjustment complete FLAG output circuit (ADJ FLAG) · D.O.detector circuit (D.O. DET) · Auto FM detector circuit (noise detect method) (FM DET) : Typ, + 10%, – 10% · Envelope detector circuit (ENVE) · Hold pulse generator · FM bandpass filter (FM BPF) · NTSC / PAL switch function · FM input automatic level adjust circuit (FM 13, 16, 19 ALC: ON / OFF) VCC: 18 GND: 15 Video ICs BH7802K NORMAL IN MIX OUT LINE R OUT LINE L OUT MUTE: H NORMAL OUT MUTE: H MUTE CTRL •Application example 33 LINE2 L IN 4.7k 32 31 30 29 28 27 26 25 24 0.0047µ 23 100µ MIX AMP 34 0.022µ 2.2M 47µ 1500p 4.7k 10µ LINE2 R IN 1500p VEE 22 PNR 35 21 LINE AMP 4.7µ 100µ UNREG VCC 4.7k MODEM LINE AMP 36 VCC FM OUT SW 20 19 D.O. COM. 38 18 47µ REG 27k LINE2L LINE2R BSL BSR 39 100µ BS L IN 4.7k 4.7k 15 42 ALC ENVELOPE MODEM Hi-Fi DET INPUT 43 13 SWITCH DATA DECODER 44 1 2 ENVELOPE / Hi-Fi DET / AAA FLAG 14 3 4 5 6 PNR 7 8 2.2M TUNER R IN 47µ 9 FM PB IN 100µ 12 10 11 0.0047µ BS R IN 16 41 0.022µ 4.7k UNREG VEE 27k FMBPF 10µ 4.7k SWITCH DATA LINE1 L IN 40 17 VCO BPF AUTO ADJUST OUTPUT CLOCK LINE1 R IN 4.7k AUDIO HEAD SWITCH PULSE IN 0.022µ 37 VEE FM REC OUT TUNER M IN fsc IN TUNER L IN Fig.2 notes •TheOperation VCO oscillation frequency and frequency deviation, and the BPF center frequency are directly influenced by the temperature characteristics of the setting resistors connected to pins 16 and 17. Use metal-film components. 13 Video ICs BH7802K •Electrical characteristic curves GAIN: Gv (dB) – 20 Lch Rch Lch 1.3MHz Rch – 10 1.4MHz 1.7MHz 1.8MHz – 20 GAIN: Gv (dB) – 10 – 30 – 30 – 40 – 40 – 50 – 50 0.75 1.50 2.25 0.85 1.60 2.35 FREQUENCY: f (MHz) FREQUENCY: f (MHz) Fig. 3 FM BPF frequency characteristics (NTSC) Fig. 4 FM BPF frequency characteristics (PAL) •External dimensions (Units: mm) 14.0 ± 0.3 10.0 ± 0.2 23 22 44 12 2.15 ± 0.1 0.05 1 0.8 11 0.35 ± 0.1 QFP44 14 1.2 14.0 ± 0.3 10.0 ± 0.2 33 34 0.15 ± 0.1 0.15