BA7760中文资料
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THDM
3.65 4.87 6.09
55.0 65.0
—
— – 122 – 114
—
0.008 0.1
Maximum output level Input impedance Crosstalk 〈MIX BF (f = 1kHz)〉 Voltage gain Output residual noise Distortion
(Note: The attached component numbers are those used in “Application Example.”)
60dB
40dB 20dB
C
=
C 150pF
=
0
0dB
180°
– 20dB
0°
3 1kHz
61 3 61 3 10kHz 100kHz
16M1 Hz31601MHz310601M–H1z80°
8 MIX OUT
Mixer buffer output
Push-pull
9 MIC OUT Ch2 CH2 microphone amplifier output
Push-pull
10 FILTER Ch2
CH2 microphone amplifier fc
Base (NPN) ~ 450Ω
11 MIC IN ( + ) Ch2 CH2 microphone amplifier input ( – ) Base (NPN)
VOMB
ZinB MTB VTHMUTE
8.3
10.5
—
50.0 66.5
—
— – 110 – 100
2.12 2.62 3.12
mA
—
dB VIN = – 70dBV
dBV Rg = 2.2kΩ, DIN AUDIO
%
VIN = – 40dBV B.W. = 0.4 ~ 30kHz
dBV
THD = 1% B.W. = 0.4 ~ 30kHz
•Application example
BA7760 / BA7760F
Mode MUTE MUTE
Control signal
Operation
L
Muted
H
Normal operation
FREQUENCY : f (Hz)
Characteristics when using standard components and standard constants
Fig. 3 Microphone amplifier
frequency characteristics
VOLTAGE GAIN : GV (dB) PHASE
VomM ZinM CTM
8.3
10.4
—
92
123
—
— – 86 – 78
GVB VnB THDB
– 0.7 — —
0 – 110
0.7 – 100
0.002 0.07
Maximum output level
Input impedance Mute level Mute threshold voltage
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗1 Unmounted. Reduced by – 6.0mW for each increase in Ta of 1°C over 25°C. ∗2 Unmounted. Reduced by – 4.5mW for each increase in Ta of 1°C over 25°C.
10
11 220Ω
+ 12
4.7µF 2.2kΩ
13
–+
+–
14
BA7760 / F
5
4 220Ω
4.7µF + 3
2.2kΩ 2
470µF +
+ 47µF
+ 1
22µF
VCC
Fig. 2
•Circuit operation (Refer to “Application Example”)
The BA7760 and BA7760F are dual microphone amplifiers. The audio signals from the microphones are input to pins 3 and 12. The gain at this time is determined by attached resistors R3 / R4 and R6 / R7. By attaching capacitors to pins 5 and 10, the microphone amplifiers can be given frequency characteristics like those shown below.
•Applications
Audio equipment with karaoke features, VCRs, LDs, etc.
•Features
1) Internal 2-channel low noise microphone amplifier. 2) Internal mixer buffer amplifier with mute function. 3) Available in 2 types of packages: DIP 14-pin or SOP
kΩ VIN = – 40dBV, 100kΩAttenuation
dBV
VIN = – 36dBV Rg = 2.2kΩ, DIN AUDIO
dB VIN = – 10dBV
dBV Rg = 2.2kΩ, DIN AUDIO
%
VIN = – 10dBV
B.W. = 0.4 ~ 30kHz
dBV
THD = 1% B.W. = 0.4 ~ 30kHz
MIC AMP CH 2 –
MIX BF +
+
+
7 MIX IN 6 MIC OUT Ch1 5 FILTER Ch1 4 MIC IN Ch1 ( – ) 3 MIC IN Ch1 ( + ) 2 GND 1 RIPPLE FILTER
BA7760 / BA7760F
MIX OUT 8 MIC OUT Ch2 9
kΩ VIN = – 10dBV, 50kΩAttenuation
dBV VIN = – 10dBV, DIN AUDIO
V
—
3
元器件交易网
Multimedia ICs
•Measurement circuit
10kΩ
8
5kΩ
10µF
9
MIX BF +
–
BA7760 / BA7760F
5 FILTER Ch1
CH1 microphone amplifier fc
Base (NPN) ~ 450Ω
6 MIC OUT Ch1 CH1 microphone amplifier output
Push-pull
7 MIX IN
Mixer buffer input
Base (NPN) // 65kΩ
14-pin.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Applied voltage
VCC
Power dissipation
BA7760 BA7760F
Pdห้องสมุดไป่ตู้
15
V
600∗1 mW
450∗2
Operating temperature
12 MIC IN ( – ) Ch2 CH2 microphone amplifier input ( + ) Base (NPN) // 120kΩ
13 MUTE CTRL
Mute control
Fig.1
14
VCC
VCC
—
∗ “Parallel” and “series” respectively refer to parallel and series insertion. All figures are standard values.
Parameter
Symbol Min. Typ. Max. Unit
Conditions
Supply current
Iq
〈MIC AMP (GVC= 36dB, f = 1kHz)〉
Open loop voltage gain
GVOM
Input conversion noise
VnM
Distortion
2.2kΩ
+ 7
4.7µF
5kΩ
6
150pF 13.9kΩ
1MΩ MIC OUT MIX IN Ch1
MIC OUT MIX OUT Ch2 1MΩ 13.9kΩ 150pF
MIC AMP Ch2 MIC AMP Ch1
MIC IN Ch1
CTRL Ch2
MUTE MIC IN
470µF +
+ 47µF
•Recommended operating conditions
Parameter
Symbol
Limits
Unit
Power supply voltage
