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參數(shù)資料
| 型號： | BA7781 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Stereo microphone amplifier for camcorders |
| 中文描述： | 立體聲麥克風(fēng)放大器的攝像機(jī) |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 121K |
| 代理商： | BA7781 |
6
Video ICs
Measurement circuit switch table (blank cells: no spesification)
Parameter
BA7781K
SW1
SW2
MODE1
MODE24
1
1
H
L
1
1
1
1
1
1
1
1
1
1
1
1
1
1
L
L
INT
1
1
H
L
INT
1
1
L
L
EXT
1
1
1
1
H
Vth
1
1
Vth
L
2
2
H
L
INV (11) , HPF
1
1
H
L
INV (11) , INT
1
1
H
L
2
2
H
L
HPF, 16pin of Vth
INV, 16pin of Vth
INT, EXT
INT, EXT
EXT
INT
Signal input pin
Current dissipation 1
Current dissipation 2
Preamplifier gain
Output amplifier gain
Distortion
Maximum output
Output noise voltage
Input switch separation (INT
→
EXT)
Interchannel separation
Internal microphone power supply voltage
Input switch control voltage
High-pass filter switching attenuation characteristic
High-pass filter control voltage
Conditions other than No. 1
H and L are V
CC
and GND levels.
Measure the voltage range that maintains the mode for Vth.
Operation notes
(1) Automatic wind-noise rejection circuit
The MAX OUT (pin 10) signal passes through the
three-stage low-pass filter connected between pins 10
and 12, and the DC level of the low-frequency signal
component is detected. This DC voltage (pin 16 DC
voltage) automatically controls the on / off switching of
the high-pass filter. The components connected to pins
11 and 12 set the gain of a multiple-feedback-type two-
stage low-pass filter constructed around an inverting
amplifier, and by changing the gain of the circuit you
can adjust the detection sensitivity.
It is also possible to switch the high-pass filter manually
by applying a DC voltage to pin 16 (see Fig 2).
(2) Additional compornents for INT / EXT monitor use
An internal circuit sets pin 12 to roughly the bias poten-
tial in INT mode, and to GND for EXT mode. This
switches the external transistor on and off for INT and
EXT modes respectively. This can be used to indicate
whether the microphone amplifier is operating with the
INT or EXT input. In the case of a camcorder, this can
be used to display a massage such as “EXT MIC ON”
in the EVF.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA7781K | 制造商:ROHM 制造商全稱:Rohm 功能描述:Stereo microphone amplifier for camcorders |
| BA7785 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| BA7785FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Triple Audio Amplifier |
| BA7786FP-Y | 制造商:ROHM 制造商全稱:Rohm 功能描述:Headphone / speaker amplifier for notebook computers |
| BA7786FP--Y/BA7787FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Headphone/Speaker Amplifier for Notebook Computers |
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