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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 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 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 = 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 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
BH7802K
*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
LINE AMP
21 FM REC OUT FM OUT SW AUDIO HEAD SW PULSE IN
ERP 37 D.O. COM. REG VEE 39 LINE2L LINE2R BSL BSR OUTPUT SWITCH VCO BPF AUTO ADJUST
LINE AMP
VCC 36
MODEM
20
19 FM ALC
GND 38
18 VCCM
17 VCO FO ADJ
LINE1 R IN 40
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
BH7802K
*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 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 = 0.022F) NR emphasis time constant setting (External C = 0.0047F) PNR operating reference potential point Playback FM input 660mVP-P Typ. Input coupling capacito (GND ~ VCC) Pin voltage 0.0V 0.0V -- -- -- 0.0V - 5.0V 0.0V 0.0V 0.0V 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 100k EF (NPN) ~ 500 EF (NPN) 330 EF (P-P) 3k ( > 2.5V) 88k 10k -- C (NPN) -- -- 88k C (PNP) 88k
EE: 0.8V FM Lch signal component envelope output / Hi-Fi DET output / ADJ FLAG output for ADJ PB: 1.0V 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) 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; 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 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 30 (29pin)
200
5k
11.56k 50 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
AHSWP IN (20pin) ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin)
BH7802K
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 GND
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
BH7802K
*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 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 : 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
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 pin voltage (positive) Regulator pin voltage (negative) Line output level Channel balance (L / R) Distortion Maximum output level ALC level ALC distortion Output residual noise Crosstalk Muting level IqPEE IqPPB IqMEE IqMPB VCC VEE VOEE CBEE THDEE VOMEE VALC THDALC VONEE CTEE MTEE 30.0 40.0 - 20.0 - 22.0 4.75 - 5.35 - 11.7 - 0.8 -- 8.3 + 2.8 -- -- -- -- 40.0 54.0 - 15.0 - 16.0 5.10 - 5.00 - 10.2 0.0 0.017 10.7 + 4.8 0.03 - 94.0 - 88.0 - 103 53.0 72.0 - 11.0 - 12.0 5.45 - 4.65 - 8.7 0.8 0.10 -- + 6.8 0.25 - 87.0 - 70.0 - 90 mA mA mA mA V V 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 Symbol Min. Typ. Max. Unit Conditions
BH7802K
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
OUTPUT: LINE OUT L / R)
Relevant input shorted to GND, 2 Relevant input: shorted to GND Non-relevant input: Input condition 2, 2 INPUT condition 2, 2 INPUT condition 1 L&R input together, 1
(INPUT: TU L / R, LINE1 L/R, LINE2 L / R, BS L / R, TU M IN Normal out output level VONORM - 21.5
OUTPUT: NORMAL OUT) - 18.5 dBV
- 20.0
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 VOLINE1
OUTPUT: LINE OUT L / R) - 11.7 -- -- - 10.2 0.005 - 99.0 - 8.7 0.09 - 87.0 dBV % dBV VIN = - 10.2dBV VIN = - 10.2dBV, 1 BS IN pin shorted to GND, 2
OUTPUT: LINE OUT L / R) + 8.8 + 9.8 + 10.8 dB VIN = - 20dBV INPUT condition 1 L&R input together INPUT condition 1 L&R input together, 1 INPUT condition 2 L&R input together OUTPUT: MIX OUT) dBV % dBV
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
- 10.7 -- - 4.2
- 8.7 0.08 - 2.2
- 6.7 0.50 - 0.2
1: B.W. = 0.4 to 30kHz 2: DIN
7
Video ICs
Parameter Symbol Min. Typ. Max. Unit Conditions
BH7802K
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 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 1.2905 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 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
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) Carrier setting resistor, after BPF f0 djustmen, VIN = 660mVP-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 - 12.7 - 12.7 VODL - 10.0 VODR - 10.0 -- -- -- -- - 10.2 - 10.2 VODL - 7.8 VODR - 7.8 0.12 0.13 - 98.0 - 98.0 - 7.7 - 7.7 VODL - 5.6 VODR - 5.6 0.35 0.35 - 92.0 - 92.0 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 = 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)
1: B.W. = 0.4 to 30kHz
2: DIN
AUDIO
8
Video ICs
Parameter Symbol Min. Typ. Max. Unit Conditions
BH7802K
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&1.70MHz 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 ATTNLC - 9.8 ATTNLC - 8.1 --
- 11.1 ATTNLC - 5.3 ATTNLC - 5.0 --
- 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
ATTNL
1.45
ATTNL
1.70
ATTNRC ATTNR
1.55
- 15.3 ATTNRC - 8.8 ATTNRC - 9.5 --
- 12.3 ATTNRC - 5.7 ATTNRC - 4.7 --
- 9.3 ATTNRC - 3.4 ATTNRC - 1.4 ATTNRC - 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
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 -- --
BH7802K
Symbol Min. Typ. Max. Unit Conditions
10
Video ICs
BH7802K
*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
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
LINE AMP
21
10k
FM REC OUT
4.7
LINE AMP
VCC
36
100
MODEM
FM OUT SW
20
AHSWP IN
4.7k
VCCS
0.022
19 D.O. COM.
37
38 REG
VEE
18
47 27k
39
100
4.7k
LINE1 R IN
40
S40
LINE2L LINE2R BSL BSR
OUTPUT SWITCH
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
1k
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
BH7802K
*Circuit operation Function table
The BH7802K includes the following functions on one chip.
No. 1 Block name Regulator I2C BUS control Main function Pin number 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
* 5V regulator (VCC, VEE) * Anti-pop circuit (ANTI-POP) * I2C
BUS data decoder
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, + 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)
: FM MIX1 to 4, FM L, FM R, BPF L, BPF R
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
* 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
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
* FM bandpass filter (FM BPF) * NTSC / PAL switch function * FM input automatic level adjust circuit (FM
13, 16, 19 ALC: ON / OFF)
12
Video ICs
BH7802K
*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
LINE AMP
21 FM OUT SW
FM REC OUT
4.7
LINE AMP
VCC
36
100
MODEM
20
UNREG VCC
4.7k
0.022
19 D.O. COM.
AUDIO HEAD SWITCH PULSE IN
37
38 REG
VEE
18
47 27k
39
100
LINE1 R IN
4.7k
40
LINE2L LINE2R BSL BSR
OUTPUT SWITCH
VCO BPF AUTO ADJUST
17
27k
FMBPF
16
LINE1 L IN
4.7k
41 ENVELOPE 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
BH7802K
*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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