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Video ICs
Stereo zoom microphone amplifier for camcorders
BA7780KV
The BA7780KV is a microphone amplifier developed for use in camcorders. The IC features an electronic volume circuit for presetting the curve required for the stereo zoom function, a microphone element power supply regulator, a wind-noise rejection filter, a current limiting circuit for external accessory power supplies, and an input for external microphone input. The IC operates off a 3.3V power supply.
*Applications Camcorders *Features off a 3.0V to 5.25V power supply. 1) Operates
2) Zoom microphone processing function on one chip. 3) Built-in electronic volume for external setting of sensitivity and control voltage. 4) Adjustable microphone element sensitivity. 5) Matrix amplifier for stereo emphasis. 6) Automatic switching circuit for external inputs, and built-in external monaural decision circuit.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 750 - 10 ~ + 70 - 55 ~ + 125 Unit V mW C C
Reduced by 7.5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCCS Min. 3.0 Typ. -- Max. 5.25 Unit V
1
Video ICs
BA7780KV
*Block diagram
OUT AMP IN L
PRE OUT L
MTX OUT L
INV OUT L
GC OUT L
BL OUT L
SUB IN L
MTX IN L
HPF IN L
MODE 43
EXT IN L
INT IN L
VREG L
48 GND L 49 MIX1 IN L 50
13dB
47
46
45
44
43
42
41
40
39 GC
38
37
36
35
34
33 32 OUT L 31 MIC MONO 30 Z B
13dB
REC
EXT INT
- +
INT: ON
GZ CONT 51 SUB INV2 OUT 52 SUB INV2 IN 53 SUB BUF2 OUT 54 SUB VCA OUT 55 SUB VCA IN 56 MIX CImt MIX2 OUT 57 SUB BUF2 IN 58 SUB INV1 OUT 59 SUB BUF1 OUT 60
EXT 15dB EXT INT
EXTC L 29 Z A 28 Z SENSE 27 Z POINT 26 GAIN CONT 25 EX VCC OUT 24 EX VCC 23 VCC 22 Z AC HPFC 21 Z BC 20 IN MONI 19 HPF CONT 18 BIAS SUB 17 OUT R 16 EXTC R
-+
RFLT BALANCE
5dB
BALANCE
5dB INT
SUB BUF1 IN 61 MIX1 OUT 62 MIX1 IN R 63
13dB
15dB
MIX
INT INT: 0N
GND R 64 01 RIPL 02 SUB IN R 03 INT IN R 04 VREG R
EXT 13dB
GC 09 INV OUT R 10 GC OUT R
05 EXT IN R
06 MODE 6
07 PRE OUT R
08 OUT AMP IN R
11 MTX IN R
MTX OUT R
BL OUT R
HPF IN R
2
BIAS R
- +
REG
12
13
14
BIAS 15
RFLT
BIAS L
BG
Video ICs
BA7780KV
*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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Pin name RIPL SUB IN R INT IN R VREG R EXT IN R MODE 6 PRE OUT R OUT AMP IN R INV OUT R GC OUT R MTX IN R MTX OUT R BL OUT R HPF IN R BIAS R EXTC R OUT R BIAS SUB HPF CONT IN MONI Z BC Z AC VCC EX VCC EX VCC OUT GAIN CONT Z POINT Z SENSE ZA ZB MIC MONO OUT L EXTC L BIAS L HPF IN L BL OUT L MTX OUT L MTX IN L GC OUT L INV OUT L OUT AMP IN L PRE OUT L For bias ripple filter capacitor Sub microphone input Internal microphone input Regulator output External microphone input Mode control 6 input Preamplifier output Out amplifier input Inverter output Gain control amplifier output Matrix amplifier input Matrix amplifier output Zoom balance circuit output HPF input Bias output For connection of out amplifier output inhibit capacitor Signal output Sub bias output HFP control input Input switch decision signal output For connection of noise cutting capacitor for zoom control signal For connection of noise cutting capacitor for zoom control signal VCC Current limiter VCC Current limiter output Gain control amplifier switch input Cross-point variation input for zoom balance circuit Sensitivity variation input for zoom balance circuit Zoom control input Zoom control input External microphone monaural decision signal output Signal output For connection of out amplifier output inhibit capacitor Bias output HPF input Zoom balance circuit output Matrix amplifier output Matrix amplifier input Gain control amplifier output Inverter output Out amplifier input Preamplifier output Function Pin voltage (V) 1.65 1.65 1.65 2.5 1.65 -- 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 2.3 1.65 1.65 -- -- -- -- 3.3 4.75 4.5 -- -- -- -- -- -- 1.65 2.3 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 Format 50k 100k 75k C 75k 25k EF (P - P) 100k EF (P - P) EF (P - P) B EF (P - P) EF (P - P) 100k EF (P - P) C C (P - P) EF (P - P) 10k C B B -- -- C 50k B B B B C EF (P - P) C EF (P - P) 100k EF (P - P) EF (P - P) B EF (P - P) EF (P - P) 100k EF (P - P)
3
Video ICs
BA7780KV
Pin No. 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
Pin name MODE 43 EXT IN L VREG L INT IN L SUB IN L BG GND L MIX 1 IN L GZ CONT SUB INV2 OUT SUB INV2 IN SUB BUF2 OUT SUB VCA OUT SUB VCA IN MIX2 OUT SUB BUF2 IN SUB INV1 OUT SUB BUF1 OUT SUB BUF1 IN MIX1 OUT MIX1 IN R GND R Mode control 43 input External microphone input Regulator output Internal microphone input Sub microphone input
Function
Pin voltage (V) -- 1.65 2.5 1.65 1.65 1.25 -- 1.65 -- 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 --
Format 25k 75k C 75k 100k 10k -- 100k 50k EF (P - P) B EF (P - P) EF (P - P) 100k EF (P - P) 100k EF (P - P) EF (P - P) 100k EF (P - P) 100k --
For regulator ripple filter capacitor Left channel GND Mixer amplifier input Sub VCA control input Sub inverter 2 output Sub inverter 2 input Sub buffer 2 output Sub VCA output Sub VCA input Mixer 2 output Sub buffer 2 input Sub inverter 1 output Sub buffer 1 output Sub buffer 1 input Mixer 1 output Mixer 1 input Right channel GND
EF: emitter follower, P-P: push pull, B: base, and C: collector. All numerical values are standardized values.
4
Video ICs
BA7780KV
*Electrical characteristics Measurement conditions
Unless otherwise noted, the following conditions apply: Ta = 25C, VCC3.3V, external supply voltage (pin 24) = 4.75V, pin 19 = "H" or open, pin 26 = 1 / 2VCC, pin 51 = 0.58 x pin 4, pin 27 = 0.733 x pin 4, pin 28 = 0.80 x pin 4, pin 29 = 2.2V, pin 30 = 2.2V
Parameter Current dissipation Voltage gain 1 Voltage gain 2 Voltage gain 3 Voltage gain 4 Distortion 1 Distortion 2 Distortion 3 Maximum output Output noise voltage 1 (EXT) Output noise voltage 2 (INT, WIDE) Output noise voltage 3 (INT, ZOOM) Input switch crosstalk (INT to EXT) Interchannel crosstalk GC OUT L / R gain differential Inverter OUT L / R gain differential
Internal microphone power supply output voltage External power supply output voltage External power supply limit current Input switching CTL holding voltage
Input signal level Int = - 31.5dBV Ext = - 38.5dBV Sub = - 33.5dBV (1kHz) Monitoring pins: 17 and 32 1 JIS-A filter used 2 400Hz to 30kHz filter used
Max. 12.0 29.0 27.5 24.5 21.5 0.5 0.25 0.5 -- 60 60 120 - 70 - 70 1.5 1.5 2.75 -- 30 VCC 0.7 VCC 2.0 0.5 VCC 0.5 - 5.0 1.0 8.0 1.0 Unit mA dB dB dB dB % % % Vrms Vrms Vrms Vrms dB dB dB dB V V mA V V V V V V V dB dB dB dB Conditions INT / EXT MIC IN, No input EXT MIC IN INT MIC IN, GAIN CTL H INT MIC IN, GAIN CTL M INT MIC IN, GAIN CTL L INT MIC IN, WIDE, Vo = 300mVrms EXT MIC IN, VO = 300mVrms INT MIC IN, ZOOM, VO = 300mVrms INT / EXT MIC IN, THD = 1%2 EXT MIC IN, Rg = 1k1 INT MIC IN, Rg = 1k1 GAIN CTL H INT MIC IN, Rg = 1k1 Pins 29 and 30 = 0V, GAIN CTL H Note 1 Note 2 INT MIC IN, HML, 10 39 INT MIC IN, HML, 9 40
Pins 4 and 45 output current for 30k load Pin 25 DC for pin 25 output current of 25mA Pin 25 output current when grounded "H" level, pin 6 / 43 DC "L" level, pin 6 / 43 DC "H" level, pin 26 DC "M" level, pin 26 DC "L" level, pin 26 DC
Symbol IqE GVE GVIH GVIM GVIL THDW THDE THDZ VOM VONE VONW VONZ CTIE CTCH GVGLR GVILR VREG VEXT ILTD VHSWH VHSWL VHGH
Min. -- 27.0 21.5 18.5 16.5 -- -- -- 0.75 -- -- -- -- -- - 1.5 - 1.5 2.3 4.3 -- 1.6 0 2.8 1.3 0 2.0 0 - 7.0 - 1.0 6.0 - 1.0
Typ. 8.5 28.0 24.5 21.5 18.5 0.05 0.1 0.15 0.95 30 30 60 - 76 - 76 0.0 0.0 2.5 4.5 -- -- -- -- -- -- -- -- - 6.0 0 7.0 0
Gain switching CTL holding voltage
VHGM VHGL
HPF, CTL holding voltage
VHHPFH VHHPFL
HPF OFF, 19pin DC HPF ON, 19pin DC 6362 / 5062 pin
Gain differential for pins 63 to 62 and 50 to 62
MIX 1 gain
GVM1-1 GVM1-2 GVM2-1
INT L / M / H, 257, 4757pin
Gain differential for pins 2 to 57 and 47 to 57
MIX 2 gain
GVM2-2
5
Video ICs
Parameter ZOOM - BALANCE Gain 1 Rch / Lch Symbol Min. Typ. Max. Unit Conditions
BA7780KV
1213 or 3736 pin GVZ1-1 - 23.0 - 20.0 - 17.0 GVZ1-2 - 11.7 GVZ1-3 - 2.0 - 7.7 1.0 - 4.7 4.0 dB dB dB 29, 30 pin 0.0V (DC) 29, 30 pin 0.8V (DC) 29, 30 pin 2.2V (DC)
ZOOM - BALANCE Gain 2 Rch / Lch
5213 or 5236 pin GVZ2-1 - 23.0 - 20.0 - 17.0 GVZ2-2 - 11.7 GVZ2-3 - 2.0 - 7.7 1.0 - 4.7 4.0 dB dB dB 29, 30 pin 2.2V (DC) 29, 30 pin 1.4V (DC) 29, 30 pin 0.0V (DC)
28 pin 0.8 x 4pin, 29 30 pin 1.1V, ZOOM - BALANCE Variable position Rch / Lch GVZ3-1 GVZ3-2 - 2.5 - 7.5 1213 or 3736 pin 0.5 - 4.5 3.5 - 1.5 dB dB dB 27 pin 0.64 x 4pin (DC) 27 pin 0.733 x 4pin (DC) 27 pin 0.82 x 4pin (DC)
GVZ3-3 - 20.6 - 17.0 - 12.0
27 pin 0.733 x 4pin, 29 30 pin 0.4V, ZOOM - BALANCE Variable slope Rch / Lch GVZ4-1 GVZ4-2 - 5.5 - 9.5 1213 or 3736 pin - 2.5 - 6.5 0.5 - 3.5 dB dB dB dB dB dB 28 pin 0.59 x 4pin (DC) 28 pin 0.69 x 4pin (DC) 28 pin 0.8 x 4pin (DC) 51 pin 0.74 x 4pin (DC) 51 pin 0.58 x 4pin (DC) 51 pin 0.48 x 4pin (DC)
GVZ4-3 - 17.5 - 14.5 - 11.5 Sub VCA gain 56pin 55pin GVVCA1 GV VCA2 GV VCA3 - 5.0 - 2.0 1.0 - 3.0 0.0 3.0 - 1.0 2.0 5.0
Note 1: Input switch crosstalk measurement method: (pin 19 = "H" or open, pin 26 = GND, pin 27 = 0.733 x pin 4, pin 28 = 0.80 x pin 4, pin 29 = 2.2V, pin 30 = 2.2V) Input 1kHz signals on the INT input pins (3 and 46) in INT input mode that give a distortion of 1% at the signal output pins (17 and 32), then connect the EXT input pins (5 and 44) to GND via Rg = 1k Switch to EXT input mode, and measure the relative output level of the output pins (17 and 32). Note 2: Interchannel crosstalk measurement method: The mode pin conditions are the same as for input switch crosstalk. Connect the input pin of the channel to be measured to GND via Rg = 1k. Input a 1kHz signal on the other channel's input that gives a distortion of 1% on the signal output pins (17 and 32), and measure the relative output level between the signal output pins (17 and 32).
6
MODE43
SW3 1 470p 2
Video ICs
EXT MIC IN
30k 10k 10k 0.1 0.022 2200p 0.1 0.1 0.1 0.1 0.1
*Measurement circuit
INT MIC IN
10
SUB MIC IN
+
48 47 13dB 46 45 44 43 42 41 40 39 38 37 32 31 30 15dB RFLT INT BALANCE 5dB EXT 28 27 26 25 CImt 24 RFLT BALANCE 5dB INT HPFC 21 15dB MIX INT 63 0.1 13dB 64 01 0.1 02 0.1 03 04 REG EXT 13dB 05 0.1 06 07 08 09 10 11 0.1 12 13 14 15 16 GC INT: ON EXT 20 19 18 23 BIAS 22 MIX 29 36 35 34 33
-+
49 0.1 REG INT 51 52 0.1 INT: ON 50 13dB EXT GC
Lch OUT MIC MONO ZB ZA Z SENSE Z POINT GAIN CONT EX VCC OUT EX VCC IN VCC Z AC Z BC IN MONI HPF ON / OFF SUB BIAS
GZ CONT
+ -
SW1 53 10k 3 2 32k 1 54 10k 55 10k 56 0.1 57 58 0.1 59 60 61 0.1 62
Fig. 1
GND
10
+-
Units: R [] C [F]
17
Rch OUT
+
2200p
0.022
SUB MIC IN
0.1 30k 10k 10k
0.1
470p
INT MIC IN
EXT MIC IN
1
2 SW2
BA7780KV
MODE6
7
Video ICs
BA7780KV
*Measurement circuit switching table (blank cells: no spesification)
Parameter Current dissipation Voltage gain 1 Voltage gain 2 Voltage gain 3 Voltage gain 4 Distortion 1 Distortion 2 Distortion 3 Maximum output Output noise voltage 1 (EXT) Output noise voltage 2 (WIDE) Output noise voltage 3 (ZOOM) Input switch crosstalk (INT to EXT) INT EXT GC out L / R gain differential Inverter OUT L / R gain differential Internal microphone power supply voltage External power supply output voltage External power supply limit current Input switching CTL holding voltage SW1 1 -- -- -- -- 2 2 1 1 2 2 3 2 2 2 1 1 -- -- -- 2 2 2 Gain switching CTL holding voltage 2 2 HPF, CTL holding voltage MIX 1 gain MIX 2 gain ZOOM - BALANCE Gain 1 ZOOM - BALANCE Gain 2 ZOOM - BALANCE Variable position ZOOM - BALANCE Variable inclination Sub VCA gain 2 -- -- 2 1 2 2 -- SW2 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 2.1 -- -- -- -- -- -- -- SW3 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 2.1 -- -- -- -- -- -- -- MODE6 MODE43 GAIN CTL H, L L H -- -- H L H H, L L H H L H L H H -- -- -- H Vth H H H H H H H H H H H H, L L -- -- -- L L L L L L L L L L L L -- -- -- Vth L L L L L L L L L L L L M M H M L M -- M L -- H H L M -- H, M, L H, M, L -- -- -- -- -- Vth Vth Vth -- M -- M M M M -- Signal input pin -- Ext Int Int Int Int Ext Sub Int, Ext, Sub -- -- -- Int Int Ext Int Int -- -- -- Int, Ext Int, Ext Int Int Int Int, Vth of pin 19 Int Sub Int Sub Int Int Sub
Interchannel crosstalk
Gain CTL pin 26.
H, M, and L are VCC, 1/2VCC, and GND respectively. Measure the voltage range that maintains the mode for Vth.
8
Video ICs
0.022 3300 6800p 6800p 8200 33k 10k 0.1 3300 0.022 0.022 0.022 470p 12k 0.047 2200 6800 10k 2200p 0.1 0.1 0.1 0.1 22k 48 49 5600p REG INT: 0N INT 31 30 29 EXT 28 INT 54 BALANCE 5dB 10k 55 10k 56 0.1 MIX CImt 57 0.010 58 59 BALANCE 0.01 60 1500 61 0.1 62 MIX INT 63 2700p 0.1 13dB 64 10k 01 0.1 02 0.1 03 04 05 0.1 REG EXT 13dB 06 07 08 09 10 11 0.1 12 13 14 22k 10k 0.022 3300 0.1 2200 2200 6800 0.022 15 16 GC INT: 0N 6800p 10k 19 18 15dB EXT 1k RFLT 5dB INT HPFC 21 20 10k 24 23 BIAS 22 25 26 27 50 0.1 13dB EXT GC 13dB 47 46 45 44 43 42 41 40 39 38 37 32 36 35 34 33 10k 2200 10
*Application example
EXT MIC IN
INT MIC IN
SUB MIC IN
+
-+
Lch OUT MIC MONO ZB ZA Z SENSE Z POINT GAIN CONT EX VCC OUT EX VCC IN VCC Z AC Z BC IN MONI HPF ON / OFF SUB BIAS
GZ CONT
52 10k 47k RFLT 15dB
51
+ -
53 3900p 0.1
Fig. 2
GND
10
+-
17
Rch OUT
+
2200p
0.022
SUB MIC IN
33k 10k 0.047 12k 3300 6800p 6800p
8200 0.022
INT MIC IN
Units: R [] C [F]
EXT MIC IN
470p
BA7780KV
9
Video ICs
BA7780KV
*Operation notes zoom operation Points to note regarding
When using a microprocessor to vary the voltages on pins 29 and 30 after presetting the electronic volume sensitivity and control voltage range, and with the pin 27 and 28 voltage fixed at a certain level, it is possible to minimize drift in the zoom characteristics due to tempreature fluctuations and differences between individual ICs by setting the pin 27 and 28 voltages using resistive voltage divider circuits connected to the pin 4 regulator voltage output.
4
27
28
*Electrical characteristic curves
17, 32pin OUTPUT ATTENUATION LEVEL: GVZ1 (dB) 17, 32pin OUTPUT ATTENUATION LEVEL: GVZ1 (dB) Ta = 25C 0
28pin 28pin 1.64V
Ta = 25C 0
Fig. 3
=
-5
1.64V
=
-5
27pin
27pin 1.67V 1.87V 1.87V
=
- 10
1.84V
1.84V
1.67V
- 10
- 15
1.94V
1.94V
- 15
2.07V 1.67V
- 20
2.04V
2.04V
- 20 1213, 3736pin 5213, 5236pin 0 0.1 0.6 1.1 1.6 2.1 2.2
1213, 3736pin 5213, 5236pin 0 0.1 0.6 1.1 1.6 2.1 2.2
29, 30pin CONTROL VOLTAGE: VCTL (V)
29, 30pin CONTROL VOLTAGE: VCTL (V)
Fig. 4 Zoom control slope variation characteristics
Fig. 5 Zoom control position variation characteristics
*External dimensions (Units: mm)
12.0 0.3 10.0 0.2 48 12.0 0.3 10.0 0.2 49 33 32
64 1 16
17
1.4 0.1
0.125 0.1
0.10
0.5
0.2 0.1 0.10
VQFP64
10
0.5
=

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