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BA7781 PDF预览

BA7781

更新时间: 2024-02-10 01:12:33
品牌 Logo 应用领域
罗姆 - ROHM 放大器摄像机
页数 文件大小 规格书
7页 123K
描述
Stereo microphone amplifier for camcorders

BA7781 技术参数

是否无铅:不含铅是否Rohs认证:符合
生命周期:Active零件包装代码:QFP
包装说明:QFP-32针数:32
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.33.00.01风险等级:5.71
Is Samacsys:N商用集成电路类型:AUDIO AMPLIFIER
JESD-30 代码:S-PQFP-G32JESD-609代码:e3/e2
长度:7 mm信道数量:1
功能数量:1端子数量:32
封装主体材料:PLASTIC/EPOXY封装代码:LQFP
封装形状:SQUARE封装形式:FLATPACK, LOW PROFILE
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:1.55 mm最大供电电压 (Vsup):5 V
最小供电电压 (Vsup):3 V表面贴装:YES
端子面层:TIN/TIN COPPER端子形式:GULL WING
端子节距:0.8 mm端子位置:QUAD
处于峰值回流温度下的最长时间:10宽度:7 mm
Base Number Matches:1

BA7781 数据手册

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Video ICs  
BA7781K  
Measurement circuit switch table (blank cells: no spesification)  
Parameter  
SW1  
SW2  
MODE1  
H
MODE24  
L
Signal input pin  
Current dissipation 1  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Current dissipation 2  
Preamplifier gain  
Output amplifier gain  
Distortion  
Conditions other than No. 1  
Maximum output  
Output noise voltage  
Input switch separation (INTEXT)  
1
1
L
L
INT  
INT  
1
1
1
1
1
2
1
1
2
1
1
1
1
1
2
1
1
2
H
L
L
L
INT  
Interchannel separation  
EXT  
EXT  
Internal microphone power supply voltage  
H
Vth  
H
Vth  
L
INT, EXT  
Input switch control voltage  
INT, EXT  
L
INV (11) , HPF  
INV (11) , INT  
INV, 16pin of Vth  
HPF, 16pin of Vth  
High-pass filter switching attenuation characteristic  
High-pass filter control voltage  
H
L
H
L
H
L
H and L are VCC and GND levels.  
Measure the voltage range that maintains the mode for Vth.  
Operation notes  
(1) Automatic wind-noise rejection circuit  
(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.  
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).  
6

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