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Video ICs
VCR standard audio signal processor
BA7796FS
The BA7796FS is a standard audio signal processor designed for use in VCRs and tape decks. The circuit is comprised of a playback preamplifier, a line amplifier, a recording amplifier, an ALC circuit, an EQ switch, and high-voltage head switch. The IC has three input switching systems, and a built-in coil equivalent circuit for recording equalization, which eliminates the need for an external component.
*Applications recorders and tape decks Video cassette *Featuresinput switching systems built-in (LINE1, 1) Three
LINE2, and TUNER). 2) Built-in coil equivalent circuit for recording equalization. 3) 4) 5) 6) Two-mode EQ switch. High-performance low-noise playback amplifier. Fixed ALC level ( - 7.2dB when VCC = 12V). Phase-inverting recording amplifier.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13 800 - 10 ~ + 65 - 55 ~ + 125 Unit V mW C C
When mounted on a 90mm x 50mm x 1.6mm glass epoxy board. Reduced by 8.0mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC Min. 7.5 Typ. -- Max. 12.5 Unit V
1
Video ICs
BA7796FS
*Block diagram
PB IN
1
REC
24
HEAD GND
LP + EP
HEAD EQ SW
2
23 PB
PB NFB
REC HEAD SW
3 REC SP
22
PB EQ SW
REC OUT
4 PB
21
PB OUT
REC AMP REC L2 5 EQ 0dB REC L1 6 20 PB LINE IN
ALC + 28dB
19
ALC FILTER
EQ CTRL
7
LINE
ATT
- 8dB
18
TUNER IN
VCC
8
17
INPUT SW CTRL
RIPPLE FILTER
9
ATT
- 8dB
16
LINE IN1
REC / EE CTRL
10 MUTE
15
PB / EE CTRL
BUFF
LINE OUT
11
ATT
- 8dB
14
LINE IN2
GND
12
13
MUTE CTRL
Units: R [] C [F]
2
Video ICs
BA7796FS
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin name PB IN HEAD EQ SW REC HEAD SW REC OUT REC L 2 REC L 1 EQ CTRL VCC RIPPLE FILTER REC / EE CTRL LINE OUT GND MUTE CTRL LINE IN2 PB / EE CTRL LINE IN1 Function Playback amplifier input / playback head switch Head resonance capacitor switch High-withstanding voltage recording head switch Recording amplifier output Recording EQ switch Recording EQ pin EQ control VCC Ripple filter REC / EE control Line amplifier output GND Mute control Line input 2 PB / EE control Line input 1 Pin voltage 2.0V 0.0V 0.0V 5.7V 5.7V 5.7V -- 12.0V 12.0V -- 5.7V 0.0V -- 5.6V -- 5.6V -- 5.6V PB: 0.0V PB: not fixed 5.6V 2.0V 2.0V 2.0V 0.0V I / O circuit REC: 120k REC: 11 220k / 20 (ON) REC: 11 (ON) REC: OPEN EF (P - P) 19 (ON) / OPEN B (NPN) See input / output circuit -- 10k (VCC) See input / output circuit EF (P - P) -- See input / output circuit 120k See input / output circuit 120k See input / output circuit 120k EF (NPN) ~ 100 120k EF (P - P) 35 (ON) / OPEN B (NPN) --
INPUT SW CTRL Input switch control TUNER IN ALC FILTER PB LINE IN PB OUT PB EQ SW PB NFB HEAD GND Tuner input For setting the time constant for the ALC filter (attack and recovery times) Line input for playback Playback amplifier output Playback equalizer switch Playback amplifier feedback GND for playback amplifier and head switch
EF: emitter follower, P-P: push pull, B: base, and C: collector.
All measurements made using the measurement circuit (Fig. 1) with VCC = 12V and quiescent circuit conditions. All numerical values are standardized values.
3
Video ICs
BA7796FS
*Input / output circuits
EQ CTRL 7 REC / EE CTRL 10 REC / EE CTRL 10 56k 7 EQ CTRL H L 10k L H
REC AMP
PB HEAD SW
MUTE CTRL 13
PB / EE CTRL 15
MUTE CTRL 13
56k M
PB / EE CTRL 15
56k M
INPUT SW CTRL 17
H 56k L INPUT SW CTRL 17
L, M, and H in the above diagrams are 1.7V, 2.5V, and 3.3V respectively.
4
Video ICs
BA7796FS
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 12V, and f = 1kHz)
Parameter Quiescent current EE Quiescent current PB Quiescent current REC Line amplifier Voltage gain (PB input) GVCLP 27.0 19.0 -- 7.3 -- - 8.2 -- -- 28.0 20.0 0.1 10.5 - 81.5 - 7.2 0.1 - 82.0 29.0 21.0 0.3 -- - 75 - 6.2 0.5 - 72 dB dB % dBV dBV dBV % dB VO = - 8dBV VO = - 8dBV VO = - 8dBV, RL = 4.7k THD = 1%, RL = 4.7k Rg = 4.7k, DIN AUDIO VIN = - 25dBV VIN = - 25dBV, RL = 4.7k VO = 0dBV, DIN AUDIO LINE1, LINE2, TUNERREC OUT VO = - 8dBV VO = - 8dBV, RL = 4.7k THD = 1% , RL = 4.7k
Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1
Symbol Min. IqEE IqPB IqREC 7.4 7.4 6.4
Typ. 9.8 9.8 8.4
Max. 13.0 13.0 11.2
Unit mA mA mA
Conditions No signal input No signal input No signal input
Measurement circuit
Fig.1 Fig.1 Fig.1
Voltage gain (LINE1, LINE2, TU inputs) GVCLT Distortion Maximum output level Output residual noise ALC level ALC distortion Mute attenuation ratio Recording amplifier Voltage gain Distortion Maximum output level Openloop gain Playback preamplifier Openloop gain Input conversion noise Head switch PB head switch impedance REC head switch impedance RPH RRH GVOP VNINP GVCR THDR VOmR GVOR THDLT VOmLT VNOLT VOA THDA MT
19.0 -- 7.0 60
20.0 0.13 10.0 71
21.0 0.4 -- --
dB % dBV dB
Fig.1 Fig.1 Fig.1 Fig.1
61 -- 35.0
68
- 122.5
-- - 114 37.0
dB dBV dB A VP-P E3 = 55V
-- Rg = 680, DIN AUDIO PB INPB OUT
Fig.1 Fig.1 Fig.1
Voltage gain (stand alone, SP mode) GVCP
36.0
-- -- -- 80
11 11 0 100
20 20 10 --
-- -- 1.5V
Fig.1 Fig.1 Fig.1 Fig.2
REC head switch DC withstanding voltage BVRHDC REC head switch AC withstanding voltage BVRHAC
f = 70kHz, V3
Measured at BW = 0.4 to 30kHz.
5
Video ICs
BA7796FS
*Measurement circuits
68k PB IN 3.3 ON : GvoPB 1 REC 24 330 22 PB OUT 4.7 0.01 4.7k 4.7k LINE PB IN 22 2.2M ON : ALC OFF 0.1 TUNER IN LINE IN1 LINE IN2
+
680
HEAD EQ SW
2 LP + EP PB
23 12k 330k
REC HEAD SW REC OUT 4.7
3 REC SP
22 8.2k
4 15k PB
21 0.1
4.7k
6000p
5 1.5k 1800p 12k
REC AMP EQ 0dB
20
6
ALC + 28dB
19
EQ CT RL 33
7
LINE
ATT - 8dB
18
+
+
4.7k 8 17 0.1 INPUT SW CTRL
VCC
22
9
ATT - 8dB
4.7k
16
REC / EE CTRL 4.7
10 MUTE
15 0.1
PB / EE CTRL
BUFF
LINE OUT
11
ATT - 8dB
4.7k
14
4.7k 12 13 MUTE CTRL
Units: R [] C [F]
Fig. 1
6
+ + + + +
Video ICs
BA7796FS
LP + EP
1
PB IN
2
SW3 4
REC REC OUT
3
0.1
V ~
BVRHAC
100k
100k
1k
~
V V3 0.1
e3
Fig. 2 REC head switch AC withstanding voltage measurement circuit
*Control/ mode tablePB / EE CTRL, INPUT SW CTRL (1) REC EE CTRL,
Control pins REC / EE L L L L H H H H PB / EE L L L H L L L H INPUT SW L M H -- L M H -- TUNER LINE2 LINE1 PB TU REC L2 REC L1 REC inhibit Mode PB HSW OFF OFF OFF OFF ON ON ON -- ON ON ON ON OFF OFF OFF -- Function REC HSW LINE SW TUNER LINE2 LINE1 PB TUNER LINE2 LINE1 -- REC AMP OFF OFF OFF OFF ON ON ON --
If REC / EE CTRL is set to"M", the REC pause state is possible (REC head switch: open, REC amplifier: off).
(2) MUTE CTRL
Control pins Mode MUTE H L MUTE MUTE LINE SW OPEN CLOSE Function
(3) EQ CTRL
Control pins EQ L M H Mode 2 MODE SP -- EP 3 MODE SP LP EP HEAD EQ OFF ON ON Function PB EQ CLOSE OPEN OPEN REC EQ CLOSE CLOSE OPEN
7
Video ICs
BA7796FS
3.3
*Application example
1
REC
24 330 22 0.01 TUNER IN LINE IN1 LINE IN2
LP + EP
2
23 12k 330k 22 8.2k SP 21 REC AMP EQ 0dB 0.1 PB 20 19 0.1 ATT
- 8dB
4
5 BIAS OSC REC + B EQ CTRL 33 + 7
REC
3
PB
6
ALC + 28dB LINE
18
VCC 22
8
+
17 0.1
INPUT SW CTRL
9
ATT
- 8dB
16
MUTE
REC / EE CTRL LINE OUT RL
10
15 0.1
PB / EE CTRL
BUFF
11
ATT - 8dB
14
12
13
MUTE CTRL
Fig. 3
Units: R [] C [F]
*Operation notes (1) Mute signal
Apply the mute signal shown below at power on and off. If the muting time is short, a "pop" sound will be audible, particularly when the power is switched on.
Vcc (H) (H) MUTE CTRL
2 sec. Min.
LINE OUT
(2) Recording control Do not switch the PB and REC modes on together. This will cause erroneous operation. (3) Line output The line output can drive a load resistance of up to 2k. Some types of load can result in local oscillation (eg. large capacitive loads that draw large current), so caution is required. In particular, when there is a possibility that the line output will be connected to a shielded cable, or line cable, connect a resistor of about 1k in series with the output so that the capacitive load is not directly coupled to the IC output terminal.
The mute signal must also be applied when switching PB, LINE1,LINE2 and TUNER.
8
+
+ + +
+
Video ICs
BA7796FS
*Electrical characteristic curves
VCC = 12V VIN = - 65dBV 50 GAIN: GV (dB)
+
PB
SP; ON. 22 8.2k 21
MAXIMUM OUTPUT VOLTAGE: Vom (dBV)
60
10 10 OUTPUT LEVEL: VOUT (dBV) 00 VCC = 12V f = 1kHz
Input: LINE1 IN Output: LINE OUT
23
OUT 330k 12k 0.01 22 330
8
40 EP 30
6
SP
4
Vcc = 12V THD = 1% (BW = 0.4 ~ 30k [Hz]) ALC OFF
LINE
- 10
20
2
+10
VOUT RL
- 20
10
100
1k
10k
100k
1M
10M
0
100 200
500
1k
2k
5k
10k
- 30 - 40
- 30
- 20
- 10
0
FREQUENCY: f (Hz)
LOAD RESISTANCE: RL ()
INPUT LEVEL: VIN (dBV)
Fig. 4 Gain vs. frequency (PB amplifier)
Fig. 5 Line amplifier load drive characteristics
Fig. 6 ALC input / output characteristics
50
40 GAIN: GVR (dB)
VCC = 12V ALC OFF Input: LINE1 IN Output: REC OUT
6 5 4
12k
15k 6000p
OUT
30
1800p
EP SP
1.5k
20
10
100
1k
10k
100k
FREQUENCY: f (Hz)
Fig. 7 Gain vs. frequency (REC amplifier)
9
Video ICs
BA7796FS
*External dimensions (Units: mm)
10.0 0.2 24 7.8 0.3 5.4 0.2 13
1 1.8 0.1
12
0.11
0.8
0.36 0.1
0.3Min. 0.15
SSOP - A24
10
0.15 0.1

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