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Multimedia ICs
Microphone Amplifier
BA7760 / BA7760F
The BA7760 and BA7760F are dual microphone amplifiers designed for audio signal amplification. These are low noise amplifiers with a low -122dBV (typically) equivalent input noise voltage. Each IC has an internal mixer buffer amplifier for the mixing of signals from two channels. When used with the BA7725S or BA7725FS, the BA7726AS or BA7726AFS and BU9252S or BU9252F, these ICs simplify the configuration of digital echo systems with two inputs (for karaoke duets, for instance).
*Applications with karaoke features, VCRs, LDs, etc. Audio equipment *Features2-channel low noise microphone amplifier. 1) Internal
2) Internal mixer buffer amplifier with mute function. 3) Available in 2 types of packages: DIP 14-pin or SOP 14-pin.
*Absolute maximum ratings (Ta = 25C)
Parameter Applied voltage Power dissipation BA7760 BA7760F Symbol VCC Pd Topr Tstg Limits 15 6001 4502 - 25 ~ + 75 - 55 ~ + 125 Unit V mW C C
Operating temperature Storage temperature
1 Unmounted. Reduced by - 6.0mW for each increase in Ta of 1C over 25C. 2 Unmounted. Reduced by - 4.5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions
Parameter Power supply voltage Symbol VCC Limits 6 ~ 14 Unit V
1
Multimedia ICs
BA7760 / BA7760F
*Block diagram
3 MIC IN Ch1 ( + ) 1 RIPPLE FILTER 4 MIC IN Ch1 ( - ) 6 MIC OUT Ch1 5 FILTER Ch1 7 MIX IN 2 GND MUTE CTRL 13
- MIX BF + + - MIC AMP CH 1 MIC AMP CH 2 + - FILTER Ch2 10
MIC IN Ch2 ( - ) 11
MIC IN Ch2 ( + ) 12
MIX OUT 8
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin name RIPPLE FILTER GND MIC IN ( + ) Ch1 MIC IN ( - ) Ch1 FILTER Ch1 MIC OUT Ch1 MIX IN MIX OUT MIC OUT Ch2 FILTER Ch2 MIC IN ( + ) Ch2 MIC IN ( - ) Ch2 MUTE CTRL VCC Ripple filter GND CH1 microphone amplifier input ( + ) CH1 microphone amplifier input ( - ) CH1 microphone amplifier fc CH1 microphone amplifier output Mixer buffer input Mixer buffer output CH2 microphone amplifier output CH2 microphone amplifier fc CH2 microphone amplifier input ( - ) CH2 microphone amplifier input ( + ) Mute control VCC Function Pin type Base (NPN) // 15k -- Base (NPN) // 120k Base (NPN) Base (NPN) ~ 450 Push-pull Base (NPN) // 65k Push-pull Push-pull Base (NPN) ~ 450 Base (NPN) Base (NPN) // 120k Fig.1 --
"Parallel" and "series" respectively refer to parallel and series insertion. All figures are standard values.
2
MIC OUT Ch2 9
VCC 14
Multimedia ICs
BA7760 / BA7760F
*Input / output circuits
40k MUTE CTRL 13
Fig. 1
*Electrical characteristics (unless otherwise noted, Vcc = 12V, Ta = 25C)
Parameter Supply current Symbol Iq Min. 3.65 Typ. 4.87 Max. 6.09 Unit mA Conditions --
MIC AMP (GVC= 36dB, f = 1kHz)
Open loop voltage gain Input conversion noise Distortion Maximum output level Input impedance Crosstalk GVOM VnM THDM VomM ZinM CTM 55.0 -- -- 8.3 92 -- 65.0 - 122 0.008 10.4 123 - 86 -- - 114 0.1 -- -- - 78 dB dBV % dBV k dBV VIN = - 70dBV Rg = 2.2k, DIN AUDIO VIN = - 40dBV B.W. = 0.4 ~ 30kHz THD = 1% B.W. = 0.4 ~ 30kHz VIN = - 40dBV, 100kAttenuation VIN = - 36dBV Rg = 2.2k, DIN AUDIO
MIX BF (f = 1kHz)
Voltage gain Output residual noise Distortion Maximum output level Input impedance Mute level Mute threshold voltage GVB VnB THDB VOMB ZinB MTB VTHMUTE - 0.7 -- -- 8.3 50.0 -- 2.12 0 - 110 0.002 10.5 66.5 - 110 2.62 0.7 - 100 0.07 -- -- - 100 3.12 dB dBV % dBV k dBV V VIN = - 10dBV Rg = 2.2k, DIN AUDIO VIN = - 10dBV B.W. = 0.4 ~ 30kHz THD = 1% B.W. = 0.4 ~ 30kHz VIN = - 10dBV, 50kAttenuation VIN = - 10dBV, DIN AUDIO --
3
Multimedia ICs
BA7760 / BA7760F
*Measurement circuit
MIX OUT 10k MIX BF 8 5k 10F + - 9 150pF 6 150pF 7 + 4.7F 5k 2.2k MIX IN 1M 470F + 11 + 47F MIC IN Ch2 220 4.7F 4 220 + 47F MIC IN Ch1 MIC OUT Ch2 MIC OUT Ch1 2.2k 13 2 22F 13.9k
MIC AMP Ch2
10
MIC AMP Ch1
13.9k
1M
-
+
+
-
5
470F +
+ 4.7F 2.2k
12
3
+
MUTE CTRL
VCC
14
1
+
BA7760 / F
Fig. 2
(Refer to "Application Example") *Circuit operationBA7760F are dual microphone ampliThe BA7760 and
VOLTAGE GAIN : GV (dB)
fiers. 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.
(Note: The attached component numbers are those used in "Application Example.")
60dB
40dB
C C
20dB
=
15
0p
F
0dB 180 0 3 61 3 61 3 61 3 61 3 61 - 180 1kHz 10kHz 100kHz 1MHz 10MHz 100MHz FREQUENCY : f (Hz) Characteristics when using standard components and standard constants
- 20dB
Fig. 3 Microphone amplifier frequency characteristics
4
PHASE
=
0
Multimedia ICs
Output from these dual amplifiers is level-adjusted with an attached volume control (VR) and then input to pin 7 and mixed by the mixer buffer amplifier. The ON / OFF operation of the mixer buffer amplifier can be controlled with the signal input to pin 13 (MUTE CTRL). For DC loads, this volume control (VR) should be set above 4.5k to assure proper performance of the IC's internal driver.
Mode MUTE MUTE
BA7760 / BA7760F
Control signal L H Operation Muted Normal operation
*Application example
MIXOUT MIX BF
+
10F
9 150pF MIC AMP Ch2 MIC AMP Ch1
6 150pF
5k (VR)
1F 12k
1F 12k
R6
-
+
+
-
R7 11 220 4 47F
+
R3
10
5
R4
+
220 4.7F
+ +
MICIN Ch2
22k
+
-
5k (VR)
47F MICIN Ch1
12
3
4.7F 2.2k MUTE CTRL 13 2 2.2k
VCC
14
1
22F
BA7760 / F
Fig. 4
0.1F
8
+
7
0.1F
10k
22k
+
+
5
Multimedia ICs
BA7760 / BA7760F
*External dimensions (Units: mm)
BA7760
19.4 0.3 14 8 6.5 0.3 14 6.2 0.3 4.4 0.2
BA7760F
8.7 0.2 8
1 0.51Min. 4.25 0.3
7 7.62
1.5 0.1
1
7
0.3 0.1
0.11
1.27
0.4 0.1
0.3Min. 0.15
3.2 0.2
2.54
0.5 0.1
0 ~ 15
DIP14
SOP14
6
0.15 0.1

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