Video ICs Single chip Hi-Fi audio signal processor BH7801BK The BH7801BK 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 •VCRs •1)Features Operates off dual ± power supply which allows a 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. 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 STREO, LEFT, and RIGHT, and Hi-Fi, MIX, and NORMAL, and a BS MONITOR function is also provided. 4) The PNR processor and FM modulator / demodulator circuit have reversed characteristics at recording and playback. In addition, the adjustment for carrier frequency and FM deviation / playback level are common. •Absolute maximum ratings (Ta = 25°C) Parameter Limits Unit VCC 18, 36pin ······················· 6.0 V VEE 39pin ························· – 6.0 V VIN V VIN ···················· 6.5 Pins other than the above ··· 6.0 V Pd 850∗ mW Operating temperature Topr – 10 ~ + 70 °C Storage temperature Tstg – 55 ~ + 125 °C Applied voltage Power dissipation ∗ Symbol 5, 6, 32pin 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 BH7801BK 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 VREFP 35 FM OUT SW MODEM VCC 36 ERP 37 20 AUDIO HEAD SW PULSE IN LINE AMP 19 FM ALC LINE AMP D.O. COM. GND 38 18 VCCM REG 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 14 ENVE OUT / ADJ FLAG / Hi-Fi DET Hi-Fi DET INPUT BS R IN 43 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 BH7801BK •Pin descriptions Pin No. Pin name 2, 1, 3 TUNER IN L, R, M TUNER input (L, R, M) Function Pin voltage 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 I2C BUS control — — 8 FSC IN fSC input for VCO and BPF adjustment 0.0V 200kΩ 9, 25 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 capacitor (GND ~ VCC) 0.0V 100kΩ 14 ENVE OUT / ADJ FLAG / Hi-Fi DET FM Lch signal component envelope output / Hi-Fi DET output / ADJ FLAG output for ADJ EE: 0.8V PB: 1.0V 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 50kΩ 27 MIX ALC ALC time constant setting for mixer amplifier. Attack and recovery time setting 28 – 5.0V I / O circuit EF (NPN) ~ 500Ω MIX OUT Mixer amplifier output for RF converter 0.0V 30, 29 LINE L, R OUT Line output 0.0V 330Ω 31 NORMAL OUT Normal output 0.0V EF (P-P) 32 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) 34, 33 41, 40 42 44, 43 ERM VEE regulator error output BS IN L, R BS input (L, R) – 5.0V 0.0V – 5.0V 0.0V EF (NPN) — 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 BH7801BK •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 50 200 28 25k (29pin) 330 5k 200 30 26k 47k 11.56k 50 30k 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 BH7801BK 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 MUTE CTRL (32pin) VEE 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 BH7801BK •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 cotrol (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) = + 10V, UNREG – VEE = – 10V) : STEREO : BSL2 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) Signal frequency f = 1kHz • INPUT condition 1: TU IN VIN = – 20dBV, LINE1 / LINE2 / BS VIN = – 10.2dBV • INPUT condition 2: TU IN VIN = – 9.8dBV, LINE1 / LINE2 / BS VIN = 0.0dBV • INPUT condition 3: TU IN VIN = – 2.0dBV, LINE1 / LINE2 / BS VIN = 8.0dBV MODEM carrier frequency NTSC Lch 1.30MHz MODEM carrier frequency NTSC Rch 1.70MHz MODEM carrier frequency PAL Lch 1.40MHz MODEM carrier frequency PAL Rch 1.80MHz fsc NTSC 3.579545MHz fsc PAL 4.433619MHz 6 Video ICs BH7801BK 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 input voltage (positive) VCC 4.75 5.10 5.45 V Regulator input 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 OUTPUT: LINE OUT L / R) Line output level VOEE – 11.7 – 10.2 – 8.7 dBV Channel balance (L / R) CBEE – 0.8 0.0 0.8 dB INPUT condition 1 INPUT condition 1,∗1 INPUT condition 1 Distortion THDEE — 0.017 0.10 % Maximum output level VOMEE 8.3 10.7 — dBV THD = 1%,∗1 – 3.8 – 1.8 + 0.2 dBV INPUT condition 2 ALC ON THDALC — 0.03 0.25 Output residual noise VONEE — – 94.0 – 86.0 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 ALC level VALC ALC distortion (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 – 20.0 – 18.5 – 11.7 – 10.2 – 8.7 — 0.005 0.09 Output residual noise VONBS VONL2 — – 99.0 – 85.0 VOLINE1 + 8.8 + 9.8 + 10.8 VOMIX – 12.5 – 10.5 – 8.5 Distortion THDMIX — 0.08 0.50 MIX ALC level VALCMIX – 4.7 – 2.7 – 0.7 ∗1: B.W. = 0.4 to 30kHz ∗2: DIN INPUT condition 1 L&R input together,∗1 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 dBV OUTPUT: LINE OUT L / R) THDBS THDL2 Line amplifier gain1 INPUT condition 2,∗1 ALC ON OUTPUT: NORMAL OUT) Distortion 〈LINE AMP〉 (INPUT: NORMAL IN % 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 BH7801BK Parameter Symbol Min. Typ. 〈MODEM REC MODE〉 (INPUT: TUNER IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R NTSC carrier frequency PAL carrier frequency Frequency deviation Maximum frequency deviation FM output level Carrier 2nd harmonic Carrier 3rd harmonic Max. Unit Conditions OUTPUT: FM REC OUT) 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 FM OUT SW: FM L mode Rch VOFMR 310 365 420 mVP-P 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 FM OUT SW: FM R mode Spectrum ratio of 2nd harmonic with respect to fundamental Lch: FM L mode, Rch: FM R mode Spectrum ratio of 3nd 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 No input, after automatic adjustment No input, after automatic adjustment INPUT condition 1 INPUT condition 3 (f = 10kHz) 〈MODEM PB MODE〉 (INPUT: M PB IN, OUTPUT: LINE OUT L / R) Carrier setting resistor, after BPF f0 adjustment, VIN = 660mVP-P, 1.30MHz, 1.70MHz MIX IN Demodulation output level 1 VODL – 12.7 – 10.2 – 7.7 dBV Rch VODR – 12.7 – 10.2 – 7.7 dBV ∆VOD – 1.6 0.0 + 1.6 dB 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 – 86.0 dBV Unmodulated Rch VONDR — – 98.0 – 86.0 dBV ∗2 Demodulation output level L / R difference — Lch Demodulation output level 2 Demodulation distortion Demodulation noise level DEVL = ± 50.0kHz, f = 1kHz Lch DEVR = ± 50.0kHz, f = 1kHz VODL – VODR AHSWPIN: 30Hz, 5VP-P FMPBIN: DEV. = ± 40kHz (f = 10kHz) Demodulation SW noise level Relative ratio of actual values of fC = 3kHz, – 48dB / oct. after passing through LPF, and fC Rch VODSWR — – 20.0 – 19.0 dB = 20kHz, – 48dB/oct. after passing through LPF. 〈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 VODSWL Lch VRPL — – 1.2 – 20.0 0.0 – 19.0 dB + 1.2 dB Line output recording / playback level difference Rch ∗1: B.W. = 0.4 to 30kHz ∗2: DIN 8 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 BH7801BK 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 – 8.1 dB 1.30MHz + 1.70MHz FM ALC ON 〈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 ATTNL ATTNLC ATTNLC – 9.8 – 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 – 9.3 dB 1.30MHz + 1.70MHz FM ALC ON 1.15 ATTNL 1.45 ATTNL 1.70 – 11.1 NTSC Rch 1.70MHz insertion loss 1.55MHz attenuation 1.85MHz attenuation 1.30MHz attenuation ATTNRC – 15.3 ATTNR ATTNRC ATTNRC ATTNRC – 8.8 – 5.7 – 3.4 dB 1.55MHz + 1.30MHz ATTNRC ATTNRC ATTNRC – 9.5 – 4.7 – 1.4 dB 1.85MHz + 1.30MHz ATTNRC – 30.0 dB 1.30MHz + 1.70MHz 1.55 ATTNR 1.85 ATTNR 1.30 — – 12.3 — 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 τ FNDLY 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&1.7MHz 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 BH7801BK Symbol Min. Typ. Max. Unit 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 DC MUTE holding voltage VH32H 3.9 — 1.0 V — VCC V 〈Control system mode holding voltage〉 CLOCK IN DATA IN MUTE CTRL 10 Conditions Video ICs BH7801BK 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 VEE 47µ 4.7k 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 FM REC OUT 10k 4.7µ MODEM 36 VCC FM OUT SW 100µ 4.7k 20 19 LINE AMP 37 D.O. COM. LINE AMP VCCS 38 18 47µ REG 27k 39 VEE 100µ 4.7k 1k SWITCH 27k FMBPF 16 S40 4.7k 41 LINE1 L IN 15 S41 4.7k 42 ALC MODEM VEES 43 4.7k 47k 13 SWITCH S43 DATA DECODER 44 BS L IN 14 Hi-Fi DET INPUT 4.7k 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 17 VCO BPF AUTO ADJUST OUTPUT 40 LINE1 R IN AHSWP IN 0.022µ FSC IN DATA TUNER M IN CLOCK VEE Fig.1 11 Video ICs BH7801BK Circuit operation •Function table The BH7801BK includes the following functions on one chip. No. Block name Main function Pin numbers Power supply 35 ~ 39, 42 UNRE-VCC: + 10V UNREG-VEE: – 10V GND: 38 1 Regulator · ± 5V regulator (VCC, VEE) · Anti-pop circuit (ANTI-POP) 2 I2C BUS control · I2C BUS data decoder 3 Input switcher · TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch 33, 34, 40, 41 43, 44 1~3 VCC (internally wired) VEE (internally wired) GND: 38 Output switcher · Line amplifier: + 9.8dB, + 10.3dB, + 11.3dB, + 14.0dB · STEREO / LEFT / RIGHT / NORMAL switch · MIX ON / OFF switch · Mute switch · MIXER amplifier for RF converter (with ALC function) · BS / LINE2 through mode 27 ~ 30 32 VCC (internally wired) VEE (internally wired) GND: 38 PNR processor · 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 9 ~ 12 22 ~ 25 VCC (internally wired) VEE (internally wired) GND: 38 Modulator · FM modulation circuit (VCO, DEV) · FM demodulation / FM BPF MONITOR output switch (FMOUT SW) : FM MIX1 to 4, FM L, FM R, BPF L, BPF R · Recording FM treble cutoff filte (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) 8, 14 17, 21 VCC: 18 VEE (internally wired) GND: 15 8 FM detector control · 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 14, 20 VCC: 8 (internally wired) GND: 15 9 FM BPF · FM bandpass filter (FM BPF) · NTSC / PAL switch function · FM input automatic level adjust circuit (FM ALC: ON / OFF) 4 6 7 12 5~7 13, 16, 19 VCC3 (internal power supply) GND: 7 VCC: 18 GND: 15 Video ICs BH7801BK 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 FM REC OUT 4.7µ MODEM 36 VCC FM OUT SW 100µ 4.7k 19 LINE AMP 37 38 D.O. COM. 18 47µ REG 27k 39 100µ 4.7k 4.7k UNREG VEE BS R IN BS L IN 4.7k 4.7k OUTPUT SWITCH 40 27k FMBPF 16 41 15 42 ALC ENVE LOPE MODEM INPUT 43 13 SWITCH DATA DECODER 44 1 2 ENVELOPE / Hi-Fi DET / AAA FLAG 14 Hi-Fi DET 3 4 5 6 PNR 7 8 2.2M TUNER R IN 47µ 9 FM PB IN 100µ 12 10 11 0.0047µ LINE1 L IN 4.7k 0.022µ LINE1 R IN 17 VCO BPF AUTO ADJUST 10µ VEE AUDIO HEAD SWITCH PULSE IN 0.022µ LINE AMP UNREG VCC 20 fsc IN DATA TUNER M IN CLOCK 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 BH7801BK •Electrical characteristic curves GAIN: Gv (dB) – 20 1.3MHz – 10 1.4MHz 1.7MHz 1.8MHz – 20 – 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 34 22 44 12 2.15 ± 0.1 0.05 1 0.8 11 0.35 ± 0.1 QFP44 1.2 14.0 ± 0.3 10.0 ± 0.2 33 14 Rch Lch Rch Lch GAIN: Gv (dB) – 10 0.15 ± 0.1 0.15