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PDF BA7780 Data sheet ( Hoja de datos )
| Número de pieza | BA7780 | |
| Descripción | Stereo zoom microphone amplifier for camcorders | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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 cir-
cuit 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
1) Operates off a 3.0V to 5.25V power supply.
2) Zoom microphone processing function on one chip.
3) Built-in electronic volume for external setting of sen-
sitivity 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 = 25°C)
Parameter
Symbol
Power supply voltage
VCC
Power dissipation
Pd
Operating temperature
Topr
Storage temperature
Tstg
∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.
Limits
7.0
750∗
– 10 ~ + 70
– 55 ~ + 125
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ.
Power supply voltage
VCCS 3.0 —
Max.
5.25
Unit
V
1
1 page  
Video ICs
BA7780KV
•Electrical characteristics
Measurement conditions
Unless otherwise noted, the following conditions apply:
Ta = 25°C, VCC3.3V, external supply voltage (pin 24) =
4.75V, pin 19 = “H” or open, pin 26 = 1 / 2VCC, pin 51 =
0.58 × pin 4, pin 27 = 0.733 × pin 4, pin 28 = 0.80 × pin 4,
pin 29 = 2.2V, pin 30 = 2.2V
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
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)
Symbol
IqE
GVE
GVIH
GVIM
GVIL
THDW
THDE
THDZ
VOM
VONE
Min.
—
27.0
21.5
18.5
16.5
—
—
—
0.75
—
Output noise voltage 2 (INT, WIDE) VONW —
Output noise voltage 3 (INT, ZOOM) VONZ
—
Typ.
8.5
28.0
24.5
21.5
18.5
0.05
0.1
0.15
0.95
30
30
60
Max.
12.0
29.0
27.5
24.5
21.5
0.5
0.25
0.5
—
60
Unit
mA
dB
dB
dB
dB
%
%
%
Vrms
µVrms
60 µVrms
120 µVrms
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 = 1kΩ∗1
INT MIC IN, Rg = 1kΩ∗1
GAIN CTL H
INT MIC IN, Rg = 1kΩ∗1
Pins 29 and 30 = 0V, GAIN CTL H
Input switch crosstalk (INT to EXT)
CTIE
— – 76 – 70 dB Note 1
Interchannel crosstalk
CTCH — – 76 – 70 dB Note 2
GC OUT L / R gain differential
GVGLR – 1.5 0.0 1.5 dB INT MIC IN, HML,10 39
Inverter OUT L / R gain differential GVILR – 1.5 0.0 1.5 dB INT MIC IN, HML, 9 40
Internal microphone power supply output voltage VREG 2.3 2.5 2.75 V Pins 4 and 45 output current for 30kΩ load
External power supply output voltage VEXT 4.3 4.5 —
V Pin 25 DC for pin 25 output current of 25mA
External power supply limit current ILTD — — 30 mA Pin 25 output current when grounded
VHSWH
1.6
—
VCC
V
“H” level, pin 6 / 43 DC
Input switching CTL holding voltage
VHSWL
0
— 0.7 V “L” level, pin 6 / 43 DC
VHGH
2.8
—
VCC
V
“H” level, pin 26 DC
Gain switching CTL holding voltage VHGM 1.3 — 2.0 V “M” level, pin 26 DC
VHGL 0 — 0.5 V “L” level, pin 26 DC
HPF, CTL holding voltage
VHHPFH 2.0 — VCC V HPF OFF, 19pin DC
VHHPFL
0
— 0.5 V HPF ON, 19pin DC
MIX 1 gain
GVM1-1 – 7.0 – 6.0 – 5.0 dB 63→62 / 50→62 pin
GVM1-2 – 1.0 0 1.0 dB Gain differential for pins 63 to 62 and 50 to 62
MIX 2 gain
GVM2-1 6.0 7.0 8.0 dB INT L / M / H, 2→57, 47→57pin
GVM2-2 – 1.0 0 1.0 dB Gain differential for pins 2 to 57 and 47 to 57
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet BA7780.PDF ] | |
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