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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 *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 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. 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 = 25C)
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 Unit V V V V mW C C
******************** 6.5 Pins other than the above *** 6.0
5, 6, 32pin 850 - 10 ~ + 70 - 55 ~ + 125
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
BH7801BK
*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
LINE AMP 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
FMBPF
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 Hi-Fi ALC
5 SCL
6 SDA
7 GNDD
8 FSC IN
9 NR TC L
10 WTNG L
11 NR EMPH L
2
Video ICs
BH7801BK
*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 Function TUNER input (L, R, M) ALC time constant setting for Hi-Fi audio CLOCK input for I2C BUS control DATA input for I2C BUS control GND for I2C BUS 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 = 0.022F) NR emphasis time constant setting (External C = 0.0047F) PNR operating reference potential point Playback FM input 660mVP-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) Pin 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 -- EE: 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 I / O circuit 150k EF (NPN) ~ 200 B (PNP) B (PNP) -- 200k -- -- -- 11.5k 100k EE: 50k PB, ADJ: EF (NPN) -- EF (NPN) ~ 200 EF (NPN) -- EF (NPN) ~ 2.5k B (PNP) EF (NPN) ~ 200 50k EF (NPN) ~ 500 EF (NPN) 330 EF (P-P) 3k ( > 2.5V) 88k 10k -- C (NPN) -- -- 88k C (PNP) 88k
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 1 (2, 3pin) 2.0V 150k 33 (34, 40, 41, 43, 44pin)
58k
2.0V 30k
VEE GND
VEE GND
LINE L / R OUT (30, 29pin)
MIX OUT (28pin)
VCC 50 200 28
VCC
25k
330
(29pin) 30 26k
200
5k
11.56k 50 30k VEE GND
47k
VEE GND
FM REC OUT (21pin)
FM PB IN (13pin)
VCC 200 3.5V
VCC
200 21
50k
20P
2k 13
PB 3P 8k 12.5k 100k
VEE GND
VEE GND
4
Video ICs
BH7801BK
AHSWP IN (20pin)
ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin)
VCC PB 200
VCC
42.5k
30k
5k 20 14
50k
VEE GND
VEE GND
SCL (5pin)
SDA (6pin)
VCC
VCC
30k 5 6
30k
90 3V 3V
VEE
VEE
MUTE CTRL (32pin)
32 VCC
FSC IN (8pin)
VCC
51k 10k 2k
2.5V
2k 8 200 16k 50k 10k 100k 50k
100k VEE GND VEE GND
5
Video ICs
BH7801BK
*Electrical characteristics (unless otherwise noted, Ta = 25C, UNREG - VCC = + 10V, UNREG - VEE = - 10V)
* 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) : 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
Parameter REGULATOR Quiescent current (positive supply) EE Quiescent current (positive supply) PB Quiescent current (negative supply) EE Quiescent current (negative supply) PB Regulator input voltage (positive) Regulator input voltage (negative) IqPEE IqPPB IqMEE IqMPB VCC VEE 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 OUTPUT: LINE OUT L / R) INPUT condition 1 INPUT condition 1 INPUT condition 1,1 THD = 1%,1 INPUT condition 2 ALC ON INPUT condition 2,1 ALC ON Symbol Min. Typ. Max. Unit
BH7801BK
Conditions
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
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 - 11.7 - 0.8 -- 8.3 - 3.8 -- -- -- -- - 10.2 0.0 0.017 10.7 - 1.8 0.03 - 94.0 - 88.0 - 103 - 8.7 0.8 0.10 -- + 0.2 0.25 - 86.0 - 70.0 - 90 dBV dB % dBV dBV % dBV dBV dBV
Relevant input shorted to GND,2 Relevant input: shorted to GND Non-relevant input: Input condition 2,2 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 - 21.5 - 20.0
OUTPUT: NORMAL OUT) - 18.5 dBV INPUT condition 1 L&R input together,1
BS / L2 THROUGH (INPUT: BS / L2 IN L / R 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) - 11.7 -- -- - 10.2 0.005 - 99.0 - 8.7 0.09 - 85.0 dBV % dBV VIN = - 10.2dBV VIN = - 10.2dBV,1 BS IN pin shorted to GND,2
OUTPUT: LINE OUT L / R) VOLINE1 + 8.8 + 9.8 + 10.8 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
AUDIO
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
- 12.5 -- - 4.7
- 10.5 0.08 - 2.7
- 8.5 0.50 - 0.7
1: B.W. = 0.4 to 30kHz 2: DIN
7
Video ICs
Parameter Symbol Min. Typ. Max. Unit
BH7801BK
Conditions
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 fNOL fNOR fPOL fPOR DEVL DEVR 1.2905 1.6920 1.3910 1.7925 43.0 44.5 118 118 300 310 -- -- -- -- - 14.5 1.2975 1.6990 1.3980 1.7995 49.0 50.5 140 140 355 365 - 53.0 - 48.0 - 52.0 - 55.0 - 12.5
OUTPUT: FM REC OUT) 1.3045 1.7060 1.4050 1.8065 55.0 56.5 162 162 410 420 - 40.0 - 40.0 - 40.0 - 40.0 - 10.5 MHz MHz MHz MHz kHz kHz kHz kHz mVP-P mVP-P dB dB dB dB dB No input, after automatic adjustment
PAL carrier frequency
No input, after automatic adjustment
Frequency deviation
INPUT condition 1
Maximum frequency deviation
Lch DEVMax.L Rch DEVMax.R Lch Rch Lch Rch Lch Rch VOFML VOFMR f2L f2R f3L f3R fLR
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 3nd 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: 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 Lch Rch VODL VODR VOD VODL2 VODR2 THDDL THDDR VONDL VONDR VODSWL - 12.7 - 12.7 - 1.6 VODL - 10.0 VODR - 10.0 -- -- -- -- -- - 10.2 - 10.2 0.0 VODL - 7.8 VODR - 7.8 0.12 0.13 - 98.0 - 98.0 - 20.0 - 7.7 - 7.7 + 1.6 VODL - 5.6 VODR - 5.6 0.35 0.35 - 86.0 - 86.0 - 19.0 dBV dBV dB dBV dBV % % dBV dBV dB DEVL = 50.0kHz, f = 1kHz DEVR = 50.0kHz, f = 1kHz VODL - VODR 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 output level L / R difference -- Lch Demodulation output level 2 Rch Demodulation distortion Lch Rch Lch Rch Lch
Demodulation noise level
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. Recordingplayback overall characteristics (EE***INPUT: LINE IN L / R, OUTPUT: LINE OUT L / R) (PB***INPUT: FM PB IN, OUTPUT: LINE OUT L / R) 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)
Lch Line output recording / playback level difference Rch
VRPL
- 1.2
0.0
+ 1.2
dB
VRPR
- 1.2
0.0
+ 1.2
dB
1: B.W. = 0.4 to 30kHz 2: DIN
AUDIO
8
Video ICs
Parameter Symbol Min. Typ. Max. Unit
BH7801BK
Conditions
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 = 200mVP-P 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 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 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 Envelope output level SP1 Envelope output level SP2 Envelope output level EP1 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 ATTPRC ATTPR
1.40
ATTNLC ATTNL
1.15
- 14.1
- 11.1
- 8.1 ATTNLC - 2.3 ATTNLC - 2.5 ATTNLC - 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
ATTNLC ATTNLC - 9.8 - 5.3 ATTNLC - 8.1 -- ATTNLC - 5.0 --
ATTNL
1.45
ATTNL
1.70
ATTNRC ATTNR
1.55
- 15.3
- 12.3
- 9.3
dB dB dB dB
1.30MHz + 1.70MHz FM ALC ON 1.55MHz + 1.30MHz 1.85MHz + 1.30MHz 1.30MHz + 1.70MHz
ATTNRC ATTNRC ATTNRC - 8.8 - 5.7 - 3.4 ATTNRC ATTNRC ATTNRC - 9.5 - 4.7 - 1.4 -- -- ATTNRC - 30.0
ATTNR
1.85
ATTNR
1.30
ATTPLC ATTPL
1.80
- 12.9 --
- 9.9 --
- 6.9 ATTPLC - 30.0
dB dB
1.40MHz + 1.80MHz 1.40MHz + 1.80MHz
- 14.3 --
- 11.3 --
- 8.3 ATTPRC - 30.0
dB dB
1.40MHz + 1.80MHz 1.40MHz + 1.80MHz
Return delay time
FNDLY
110
125
140
mS
9
Video ICs
Parameter Control system mode holding voltage CLOCK IN L mode holding voltage H mode holding voltage 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 VH5L VH5H 0.0 2.5 -- -- 0.5 VCC V V Symbol Min. Typ. Max. Unit
BH7801BK
Conditions
10
Video ICs
BH7801BK
*Measurement circuit
NORMAL OUT LINE L OUT MUTE CTRL LINE R OUT 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
10
4.7k
24
23
0.0047
47
0.022
4.7k
LINE2 L IN
34
S34
MIX AMP
100
PNR 22
1k
0.01
35 21
10k
FM REC OUT
4.7
VCC
36
100
MODEM
FM OUT SW
20
AHSWP IN
4.7k
VCCS
0.022
LINE AMP
37
LINE AMP
19 D.O. COM.
38 REG
VEE
18
47 27k
39
100
4.7k
LINE1 R IN
OUTPUT 40 SWITCH
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
1k
S40
4.7k
LINE1 L IN
41
S41
15 ENVE LOPE Hi-Fi DET 13 DATA DECODER PNR
ENVELOPE / Hi-Fi DET / AAA FLAG FM PB IN
1k
4.7k
VEES
42 INPUT 43
S43
ALC
MODEM
14
47k
4.7k
BS R IN
SWITCH
1k
4.7k
BS L IN
100
12
44
S44
1k
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
FSC IN
CLOCK
DATA
10
TUNER R IN
0.0047
0.022
11
Video ICs
BH7801BK
*Circuit operation Function table
The BH7801BK includes the following functions on one chip.
No. 1 Block name Regulator I2C BUS control Main function * 5V regulator (VCC, VEE) * Anti-pop circuit (ANTI-POP) * I2C BUS data decoder Pin numbers 35 ~ 39, 42 Power supply UNRE-VCC: + 10V UNREG-VEE: - 10V GND: 38 VCC3 (internal power supply) GND: 7 VCC (internally wired) VEE (internally wired) GND: 38
2
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, + 10.3dB, + 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 * 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 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) * 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 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: 8 (internally wired) GND: 15 VCC: 18 GND: 15
9
FM BPF
13, 16, 19
12
Video ICs
BH7801BK
*Application example
NORMAL OUT LINE R OUT LINE L OUT MUTE CTRL
MUTE: H MUTE: H
VEE
1500p
1500p
2.2M
NORMAL IN
MIX OUT
LINE2 R IN
33
32
31
30
29
28
27
26
25
10
4.7k
24
23
0.0047
47
0.022
LINE2 L IN
4.7k
34
MIX AMP
100
PNR 22
35
21 FM OUT SW
FM REC OUT
4.7
VCC
36
100
LINE AMP
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
LINE1 R IN
4.7k
OUTPUT 40 SWITCH
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
LINE1 L IN
4.7k
41 ENVE LOPE Hi-Fi DET
15
ENVELOPE / Hi-Fi DET / AAA FLAG FM PB IN
4.7k
UNREG VEE
42 INPUT 43 SWITCH
ALC
MODEM
14
BS R IN
4.7k
13 DATA DECODER PNR
BS L IN
4.7k
100
12
44
1
2
3
4
5
6
7
8
9
10
11
TUNER R IN
TUNER L IN
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.
fsc IN
DATA
TUNER M IN
2.2M
47
0.0047
0.022
10
13
Video ICs
BH7801BK
*Electrical characteristic curves
- 10 Lch Rch Lch - 10 1.4MHz - 20 GAIN: Gv (dB) 1.8MHz Rch - 20 GAIN: Gv (dB) 1.3MHz 1.7MHz
- 30
- 30
- 40
- 40
- 50 0.75 1.50 FREQUENCY: f (MHz) 2.25
- 50 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
14
1.2

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