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Video ICs
Single chip Hi-Fi audio signal processor
BH7800K
The BH7800K 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 *Features off dual power supply which allows a 1) Operates
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 SSB (Synchronized Serial 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. 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. 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: 3.59545MHz, 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)
Parameter Symbol VCC Applied voltage VEE VIN VIN Power dissipation Operating temperature Storage temperature Pd Topr Tstg Limits 18, 36pin *************************** 6.0 39pin ****************************** - 6.0 5, 6, 32pin ************************ 6.5 Pins other than the above *** 6.0 850 - 10 ~ + 70 - 55 ~ + 125 Unit V V V V mW C C
Reduced by 8.5mW for each increase in Ta of 1C over 25C when mounted on a 70mm x 70mm, t = 1.6mm glass epoxy board. 1
Video ICs
BH7800K
*Block diagram
NORMAL OUT LINE R OUT NR EMPH R 23 LINE L OUT MUTE CTRL NORMAL IN LINE2 R IN NR TC R MIX OUT WTNG R 24 MIX ALC 27
33
32
31
30
29
28
26
25
LINE2 L IN 34
MIX AMP
PNR
22 DC FB R
VREFP 35 FM OUT SW
21 FM REC OUT AUDIO HEAD SW PULSE IN
VCC 36
MODEM
20
ERP 37
AMP LINE LINE AMP
19 FM ALC D.O COM.
GND 38 REG VEE 39
18 VCCM
OUTPUT LINE1 R IN 40 SWITCH
VCO BPF AUTO ADJUST
17 VCO FO ADJ FM BPF
16 BPF ADJ
LINE1 L IN 41 ENVE LOPE Hi-Fi DET
15 GNDM ENVE OUT / ADJ FLAG / Hi-Fi DET
ERM 42 INPUT BS R IN 43 SWITCH
ALC
MODEM
14
13 FM PB IN DATA DECODER PNR
BS L IN 44
12 DC FB L
1 TUNER R IN
2 TUNER L IN
3 TUNER M IN
4 HiFi ALC
5 SCL
6 SDA
7 GNDD
8 FSC IN
9 NR TC L
10 WTNG L
11 NR EMPH L
2
Video ICs
BH7800K
*Pin descriptions
Pin No. 2, 1, 3 4 5 6 7 8 9, 25 10, 24 11, 23 12, 22 13 14 15 16 17 18 19 20 21 26 27 28 30, 29 31 32 34, 33 35 36 37 38 39 41, 40 42 44, 43 Pin name TUNER IN L, R, M Hi-Fi ALC SCL SDA GNDD FSC IN NR TC L, R WTNG L, R NR EMPH L, R DC FB L, R FM PB IN ENVE OUT / ADJ FLAG / Hi-Fi DET GNDM BPF f0 ADJ VCO f0 ADJ VCCM FM ALC AHSWP IN FM REC OUT NORMAL IN MIX ALC MIX OUT LINE L, R OUT NORMAL OUT MUTE CTRL LINE2 L, R IN VREFP VCC ERP GND VEE LINE1 IN L, R ERM BS IN L, R Tuner input (L, R, M) ALC time constant setting for Hi-Fi audio CLOCK input for SSB control DATA input for SSB bus control GND for serial control fSC input for VCO and BPF adjustment PNR attack and recovery time setting Attack R: 530, Recovery R: 6.5k Waiting characteristic, treble time constant (external C = 0.0047F) NR emphasis time constant setting (External C = 0.0047F) PNR operating reference potential point Playback FM input 1320mVP-P Typ. Input coupling capacitor (GND ~ VCC) FM Lch signal component envelope output / Hi-Fi DET output / ADJ FLAG output for ADJ GND for PNR, MODEM and BPF Center frequency adjustment for FM BPF VCO control current setting VCC for MODEM and BPF FM ALC time constant setting Audio head switching pulse input EE: recording FM output , sine wave output PB: FM BPF output monitor Normal input ALC time constant setting for mixer amplifier Attack and recovery time setting Mixer amplifier output for RF converter Line output Normal output Line output mute control input Line2 input (L, R) VCC / 2 reference voltage (power on detect and pre-charge functions) VCC regulator VCC regulator error output I / O switch GND VEE regulator LINE1 input (L, R) VEE regulator error output BS input (L, R) Function Voltage 0.0V 0.0V -- -- -- 0.0V - 5.0V 0.0V 0.0V 0.0V 0.0V EE: 0.8V PB: 1.0V 0.0V 1.9V 2.5V 5.0V 0.0V -- 3.3V 0.0V - 5.0V 0.0V 0.0V 0.0V -- 0.0V 2.5V 5.0V 5.0V 0.0V - 5.0V 0.0V - 5.0V 0.0V Format 150k EF (NPN) ~ 200 B (PNP) B (PNP) -- 200k -- -- -- 23k 100k EE: 50k PB, ADJ: EF (NPN) -- EF (NPN) ~ 200 EF (NPN) -- EF (NPN) ~ 2.5k B (PNP) EF (NPN) ~ 200 100k EF (NPN) ~ 500 EF (NPN) 330 EF (P-P) 3k ( > 2.5V) 150k 10k -- C (NPN) -- -- 150k C (PNP) 150k
Note: EF: emitter follower, P-P: push pull, B: base, and C: collector. All numerical values are standardized values.
3
Video ICs
BH7800K
*Input / output circuits
TUNER L / R / M IN (2, 1, 3pin) BS L / R IN (44, 43pin) LINE1 L / R IN (41, 40pin) LINE2 L / R IN (34, 33pin)
VCC - 2.0V
(2, 3, 33, 34, 40, 41, 43, 44pin) 1
3k
2.0V 150k
VEE GND
LINE L / R OUT (30, 29pin)
VCC 50
MIX OUT (28pin)
VCC 200 28
25k
330
(29pin) 30 26k
200
5k
11.56k 50 30k VEE GND
47k
VEE GND
FM REC OUT (21pin)
VCC 200
FM PB IN (13pin)
VCC
3.5V
200 21
25k
25k
20p
2k 13
PB 3p 8k 12.5k 100k
VEE GND
VEE GND
4
Video ICs
AHSWP IN (20pin)
VCC PB 200
BH7800K
ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin)
VCC
42.5k
30k
5k 20 14
50k
VEE GND
VEE GND
SCL (5pin) SDA (6pin)
VCC
FSC IN (8pin)
VCC
2k
30k 5
(6pin)
8
3V
100k
50k
100k VEE VEE GND
MUTE CTRL (32pin)
32
VCC
51k 10k 2k
2.5V
200 16k 50k 10k
VEE GND
5
Video ICs
BH7800K
*Electrical characteristics (unless otherwise noted, Ta = 25, UNREG - Vcc = + 10V, UNREG - VEE = - 10V)
* Output switch control (W1bit5, W1bit4, W1bit3) * BS L2 Through / LINE MUTE control (W1bit2, W1bit1) * LINE AMP gain control (W1bit7, W1bit6) * FM output cotrol (W5bit5) * FM OUT switch control (W2bit4, W2bit3, W2bit2) * NTSC / PAL control (W2bit0) * Recording MUTE (W2bit1) * Hi-Fi MUTE (W1bit0) * Normal input switch control (W3bit4, W3bit3) * Hi-Fi ALC control (W3bit0) * ENVELOPE GAIN (Typ. / + 4dB / + 6dB) control (W4bit4, W4bit3) ) * FM detector level control (W4bit7, W4bit6) * ENVE characteristic control (W4bit5) * DAC TEST control (W4bit2) * MUTE control (pin 32) Signal frequency f = 1kHz * INPUT condition 1: TU / BS / LINE1 / LINE2 VIN = - 20dBV * INPUT condition 2: TU / BS / LINE1 / LINE2 VIN = - 9.8dBV * INPUT condition 3: TU / BS / LINE1 / LINE2 VIN = - 5.0dBV 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 : 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 : L (MUTE)
6
Video ICs
Parameter [REGULATOR] Quiesent current (positive supply) EE Quiesent current (positive supply) PB Quiesent current (negative supply) EE Quiesent current (negative supply) PB Regulator input voltage (positive) Regulator input voltage (negative) IqP IqP IqM IqM
EE
BH7800K
Symbol Min. Typ. Max. Unit Conditions
30.0 40.0 - 20.0 - 22.0 4.75 - 5.35
40.0 54.0 - 15.0 - 16.0 5.10 - 5.00
53.0 72.0 - 11.0 - 12.0 5.45 - 4.65
mA mA mA mA V V
EE MODE, after carrier frequency adjustment with no input PB MODE, carrier frequency adjustment FNORM, after BPF adjustment EE MODE, after carrier frequency adjustment with no input PB MODE, carrier frequency adjustment FNORM, after BPF adjustment
PB
EE
PB
VCC VEE
[EE THROUGH] (INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R Line output level Channel balance (L / R) Distortion Maximum output level ALC level ALC distortion Output residual noise Crosstalk Muting level VOEE CBEE THDEE VOMEE VALC THDALC VONEE CTEE MTEE - 11.4 - 0.8 -- 9.0 - 3.8 -- -- -- -- - 10.2 0.0 0.017 10.7 - 1.8 0.03 - 94.0 - 88.0 - 103 - 9.0 0.8 0.10 -- + 0.2 0.25 - 86.0 - 75.0 - 90
OUTPUT: LINE OUT L / R) dBV dB % dBV dBV % dBV dBV dBV INPUT condition 1 INPUT condition 1 INPUT condition 1,1 THD = 1%,1 INPUT condition 2 ALC ON INPUT condition 2,1 ALC ON Relevant input shorted to GND,2 Relevant input: shorted to GND,2 Non-relevant input: Input condition 2,2 INPUT condition 2,2 OUTPUT: NORMAL OUT) INPUT condition 1 L & R input together,1
(INPUT: TU L / R / M IN, BS L / R IN, LINE1 L / R IN, LINE2 L / R IN Normal out output level VONORM - 21.5 - 20.0 - 18.5 dBV
[BS / L2 THROUGH] (INPUT: BS / LINE2 L / R IN Output level Distortion Output residual noise [LINE AMP] (INPUT: NORMAL IN Line amplifier gain1 VOBS VOL2 THDBS THDL2 VONBS VONL2
OUTPUT: LINE OUT L / R) - 11.4 -- -- - 10.2 0.005 - 99.0 - 9.0 0.08 - 86.0 dBV % dBV VIN = - 20.0dBV VIN = - 20.0dBV,1 BS IN pin shorted to GND,2
OUTPUT: LINE OUT L / R) VOLINE1 + 9.0 + 9.8 + 10.6 dB VIN = - 20dBV
[MIX AMP] (INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R Output level Distortion MIX ALC level VOMIX THDMIX VALCMIX - 7.2 -- - 4.2 - 6.0 0.08 - 2.7 - 4.8 0.50 - 1.2
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
1: B.W. = 0.4 to 30kHz
2: DIN
AUDIO
7
Video ICs
Parameter Symbol Min. Typ. Max. Unit Conditions
BH7800K
[MODEM REC MODE] (INPUT: TUNER IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R NTSC carrier frequency Lch Rch Lch Rch Lch Rch Lch Rch Lch Rch Lch Rch Lch Rch fNOL fNOR fPOL fPOR DEVL DEVR DEVMax.L DEVMax.R VOFML VOFMR f2L f2R f3L f3R fLR 1.2925 1.6940 1.3930 1.7945 44.0 44.0 118 118 310 320 -- -- -- -- - 14.3 1.2975 1.6990 1.3980 1.7995 50.0 50.0 140 140 355 365 - 53.0 - 48.0 - 52.0 - 55.0 - 12.5 1.3025 1.7040 1.4030 1.8045 56.0 56.0 162 162 410 420 - 40.0 - 40.0 - 40.0 - 42.0 - 10.7 MHz MHz MHz MHz kHz kHz kHz kHz mVP-P mVP-P dB dB dB dB dB
OUTPUT: FM REC OUT)
No input, after automatic adjustment
PAL carrier frequency
No input, after automatic adjustment
Frequency deviation
INPUT condition 1
Maximum frequency deviation
INPUT condition 3 (f = 10kHz) FM OUT SW: FM L mode 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 3rd harmonic with respect to fundamental Lch: FM L mode, Rch: FM R mode Spectrum ratio 1.30MHz / 1.70MHz
FM output level
Carrier 2nd harmonic
Carrier 3rd harmonic FM MIX ratio (FM MIX1 mode)
[MODEM PB MODE] (INPUT: FM PB IN, OUTPUT: LINE OUT L / R) (After BPF f0 adjustment, VIN = 1320mVP-P, 1.30MHz, 1.70MHz MIX IN) Demodulation output level 1 Lch Rch Lch Demodulation output level 2 Rch Demodulation distortion Lch Rch Lch Rch VODR2 THDDL THDDR VONDL VONDR VODL VODR VODL2 - 12.4 - 12.4 VODL - 10.0 VODR - 10.0 -- -- -- -- - 10.2 - 10.2 VODL - 7.8 VODR - 7.8 0.12 0.13 - 98.0 - 98.0 - 8.0 - 8.0 VODL - 5.6 VODR - 5.6 0.35 0.35 - 85.0 - 85.0 dBV dBV dBV dBV % % dBV dBV DEVL = 50.0kHz, f = 1kHz DEVR = 50.0kHz, f = 1kHz DEVL = 50.0kHz, f = 10kHz DEVR = 50.0kHz, f = 10kHz DEVL = 50.0kHz, f = 1kHz,1 DEVR = 50.0kHz, f = 1kHz,1 Unmodulated
2
Demodulation noise level
[Recordingplayback overall characteristics] (EE***INPUT: LINE IN L / R, OUTPUT: LINE OUT L / R) (PB***INPUT: FM PB IN, OUTPUT: LINE OUT L / R) Lch Line output recording / playback level difference Rch VRPR - 1.2 0.0 + 1.2 dB VRPL - 1.2 0.0 + 1.2 dB Carrier frequency, after adjusting BPF EE mode: INPUT condition 1 PB mode: FM PB IN = 1320mVP-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)
[FM BPF] (INPUT: FM PB IN, OUTPUT: BPF MONITOR L / R) BPF L / R level difference NTSC BPF L / R level difference PAL VBPFN VBPFP - 5.0 - 5.0 0.0 0.0 5.0 5.0 dB dB After automatic adjustment, NTSC f = 1.505MHz, VIN = 400mVP-P After automatic adjustment, PAL f = 1.605MHz, VIN = 400mVP-P
1: B.W. = 0.4 to 30kHz
2: DIN
AUDIO
8
Video ICs
Parameter NTSC Lch 1.30MHz insertion loss 1.15MHz attenuation 1.45MHz attenuation 1.70MHz attenuation NTSC Rch 1.70MHz insertion loss 1.55MHz attenuation 1.85MHz attenuation 1.30MHz attenuation PAL Lch 1.40MHz insertion loss 1.80MHz attenuation PAL Rch 1.80MHz insertion loss 1.40MHz attenuation [FNORMHi-Fi recovery delay circuit] A T T PRC A T T PR
1.40
BH7800K
Symbol Min. Typ. Max. Unit Conditions
(LcH, RcH mix input signal level 1320mVP-P (RATIO 1: 1))
A T T NLC A T T NL
1.15
- 20.1 A T T NLC - 9.8 A T T NLC - 8.1 --
- 17.1 A T T NLC - 5.3 A T T NLC - 5.0 --
- 14.1 A T T NLC - 2.3 A T T NLC - 2.5 A T T NLC - 30.0
dB dB dB dB
1.30MHz + 1.70MHz FM ALC ON 1.15MHz + 1.70MHz 1.45MHz + 1.70MHz 1.30MHz + 1.70MHz
A T T NL
1.45
A T T NL
1.70
A T T NRC A T T NR
1.55
- 21.3 A T T NRC - 8.8 A T T NRC - 9.5 --
- 18.3 A T T NRC - 5.7 A T T NRC - 4.7 --
- 15.3 A T T NRC - 3.4 A T T NRC - 1.4 A T T NRC - 30.0
dB dB dB dB
1.30MHz + 1.70MHz FM ALC ON 1.55MHz + 1.30MHz 1.85MHz + 1.30MHz 1.30MHz + 1.70MHz
A T T NR
1.85
A T T NR
1.30
A T T PLC A T T PL
1.80
- 18.9 --
- 15.9 --
- 12.9 A T T PLC - 30.0
dB dB
1.40MHz + 1.80MHz 1.40MHz + 1.80MHz
- 20.3 --
- 17.3 --
- 14.3 A T T PRC - 30.0
dB dB
1.40MHz + 1.80MHz 1.40MHz + 1.80MHz
Return delay time
FNDLY
110
125
140
mS
Delay time from input of FM PB IN (1.30MHz, 1.70MHz 1: 1 MIX) 1320mVP-P to rise of ENVE OUT AUDIO HEAD PULSE IN : f = 30Hz, 5VP-P, rectangular wave
(INPUT: FM PB IN, OUTPUT: ENVE OUT) Envelope output circuit 0dB = 1320mVP-P, 1.30MHz & 1.70MHz MIX input Envelope output level SP0 Envelope output level SP1 Envelope output level SP2 Envelope output level EP1 [Control system mode holding voltage] CLOCK IN L mode holding voltage H mode holding voltage VH5L VH5H 0.0 2.5 -- -- 0.5 VCC V V VENVSP0 VENVSP1 VENVSP2 VENVEP1 -- 2.08 3.70 1.96 0 2.58 3.95 2.46 100 3.08 4.20 2.96 mV V V V No signal, STANDARD MODE VIN = 0dB, STANDARD MODE VIN = + 10dB, STANDARD MODE VIN = - 4dB, + 4dB MODE
9
Video ICs
Parameter DATA IN L mode holding voltage H mode holding voltage MUTE CTRL MUTE holding voltage DC MUTE holding voltage VH32L VH32H 0.0 3.9 -- -- 1.0 VCC V V VH6L VH6H 0.0 2.5 -- -- 0.5 VCC V V Symbol Min. Typ. Max. Unit Conditions
BH7800K
*Measurement circuit
NORMAL OUT LINE R OUT LINE L OUT MUTE CTRL NORMAL IN
VEE VEE
22k
22k
22k
MIX OUT
1500p
1500p
2.2M
1k
LINE2 R IN
1k
S33
33
32
31
30
29
28
27
26
25
24
23
P.OFF: H
MIX AMP
0.0047
47
0.022
10
220
PNR 22
LINE2 L IN
1k
S34
Tr.35
34
R35 0.01
35 21
10k
FM REC OUT
4.7
VCC
36
100
MODEM
FM OUT SW
20
AHSWP IN
4.7k
UNREG VCC
0.022
AMP LINE
37
LINE AMP
19 D.O COM.
38 REG
VEE
18
47 27k
39
100
OUTPUT 40 SWITCH
LINE1 R IN
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
1k
LINE1 L IN
S40
41
1k S41
15 ENVE LOPE Hi-Fi DET 13 DATA DECODER PNR
ENVELOPE / Hi-Fi DET / ADJ FLAG FM PB IN
4.7k
UNREG VEE
42 INPUT
ALC
MODEM
14
47k
BS R IN
43
1k S43
SWITCH
220
12
BS L IN
44
1k S44
1
2
3
4
5
6
7
8
9
10
11
1k
TUNER L IN
S1
2.2M
47
VEE
1k
TUNER M IN
S2
1k
S3
Fig.1
10
FSC IN
CLOCK
DATA
10
TUNER R IN
0.0047
0.022
Video ICs
BH7800K
*Circuit operation Function table
The BH7800K includes the following functions on one chip.
No. 1 Block name Regulator Main function * 5V regulator (VCC, VEE) * Anti-pop circuit (ANTI--POP) * SSB data decoder Pin numbers 35 ~ 39, 42 Power supply UNREG--VCC: + 10V UNREG--VEE: - 10V GND: 38 VCC3 (internal power supply) GND: 7 VCC (internally wired) VEE (internally wired) GND: 38
2
SSB control
5~7 33, 34, 40, 41 43, 44 1~3
3
Input switcher
* TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch * Line amplifier: + 9.8dB, + 10.8dB, + 12.0dB, + 14.8dB * STEREO / LEFT / RIGHT / 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) : FM MIX1 to 4, FM L, FM R, BPF L, BPF R * 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. , + 30%, - 10% * Envelope detector circuit (ENVE) * Hold pulse generator * FM bandpass filter (FM BPF) * NTSC / PAL switch function * FM input automatic level adjust circuit (FM ALC: ON / OFF)
4
Output switcher
27 ~ 30 32
VCC (internally wired) VEE (internally wired) GND: 38
6
PNR processor
9 ~ 12 22 ~ 25
VCC (internally wired) VEE (internally wired) GND: 38
7
Modulator
8, 14 17, 21
VCC: 18 VEE (internally wired) GND: 15
8
FM detector control
14, 20
VCC: 18 (internally wired) GND: 15 VCC: 18 GND: 15
9
FM BPF
13, 16, 19
11
Video ICs
BH7800K
*Application example
NORMAL OUT LINE R OUT LINE L OUT MUTE CTRL NORMAL IN
VEE VEE
22k
1500p
1500p
22k
MIX OUT
2.2M
LINE2 R IN
33
32
31
30
29
28
27
26
25
24
23
P.OFF: H
MIX AMP
0.0047
47
0.022
10
220
PNR 22
LINE2 L IN
Tr.35
34
R35
35
21 FM OUT SW
FM REC OUT
4.7
VCC
36
100
AMP LINE
MODEM
20
UNREG VCC
4.7k
0.022
37
LINE AMP
AUDIO HEAD SWITCH PULSE IN
19 D.O COM.
38 REG
VEE
18
47 27k
39
100
OUTPUT 40 SWITCH
LINE1 R IN
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
LINE1 L IN
41
15 ENVE LOPE Hi-Fi DET 13 DATA DECODER PNR
ENVELOPE / Hi-Fi DET / ADJ FLAG FM PB IN
4.7k
UNREG VEE
42 INPUT
ALC
MODEM
14
BS R IN
43
SWITCH
220
12
BS L IN
44
1
2
3
4
5
6
7
8
9
10
11
TUNER R IN
TUNER L IN
2.2M
47
VEE
CLOCK
Fig.2
*Operation notes frequency and frequency deviation, and the BPF center frequency are directly influenced by the The VCO oscillation
temperature characteristics of the setting resistors connected to pins 16 and 17. Use metal-film components.
12
fsc IN
DATA
TUNER M IN
0.0047
0.022
10
Video ICs
BH7800K
*Electrical characteristic curves
- 10 Lch - 20 1.3MHz GAIN: Gv (dB) - 30 1.7MHz GAIN: Gv (dB) Rch
- 10 Lch - 20 1.4MHz - 30 1.8MHz Rch
- 40
- 40
- 50
- 50
0.75
1.50 FREQUENCY: f (MHz)
2.25
0.85
1.60 FREQUENCY: f (MHz)
2.35
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
33 23 22
14.0 0.3 10.0 0.2
34
44
12
1 2.15 0.1 0.05
11
0.15 0.1
0.8
0.35 0.1
0.15
QFP44
1.2
13

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