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BA3123F PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BA3123F
기능 Ground Isolation Amplifier
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BA3123F 데이터시트, 핀배열, 회로
Datasheet
Ground Isolation Amplifier
BA3123F
General Description
BA3123F is a ground isolation amplifier developed for
car audio applications. This IC efficiently eliminates
problems caused by wiring resistance and removes
noise generated by other electrical devices used in
automobiles. The external capacitor values required for
this IC are so small that it allows for compact and
reliable set design.
Key Specifications
Power Supply Voltage Range:
4V to 18V
Quiescent Current:
9.0mA (Typ)
High Common-mode Rejection Ratio(1kHz):
57dB(Typ)
Low Noise:
Low Distortion:
VNO = 3.5µVrms(Typ)
THD = 0.002%(Typ)
Operation Temperature Range: -40°C to +85°C
Features
Large Capacitors not Required
High Common-Mode Rejection Ratio
Low Noise
Low Distortion
Two Channels
Package
W(Typ) x D(Typ) x H(Max)
Applications
Car audio systems
Typical Application Circuit
SOP8
5.00mm x 6.20mm x 1.71mm
Product structureSilicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays
1/12
TSZ02201-0C2C0EZ00400-1-2
13.Nov.2015 Rev.001




BA3123F pdf, 반도체, 판매, 대치품
BA3123F
Typical Performance Curves continued
VCC=12V
VIN = -10dBm
10 20 50 100 200 500 1k 2k
Frequency : f (Hz)
5k 10k 20k
Figure 5. Voltage Gain vs Frequency
VCC=12V
VIN = -10dBm
Rg=1.8kΩ/Open
RL=10kΩ
10 20 50 100 200 500 1k 2k
Frequency : f (Hz)
5k 10k 20k
Figure 6. Channel Separation vs Frequency
VCC = 12V
f=1kHz
RL=10kΩ
VCC = 12V
VRR=-10dBm
Rg=0Ω
RL=10kΩ
10 20 50 100 200 500 1k 2k
Frequency : f (Hz)
5k 10k 20k
Figure 7. Ripple Rejection Ratio vs Frequency
Output Voltage : VOUT (Vrms)
Figure 8. Total Harmonic Distortion vs Output
Voltage
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/12
TSZ02201-0C2C0EZ00400-1-2
13.Nov.2015 Rev.001

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BA3123F 전자부품, 판매, 대치품
BA3123F
Application Information
1. Circuit Operation
Figure 13. Flow of Noise in Car Audio Systems
Car audio systems are grounded to the car body. For
this reason, electrical noise generated by the car
electrical system can enter the power amplifier input
through the chassis and become audible.
BA3123Futilizes the common-mode rejection
characteristics of an operational amplifier to eliminate
this noise. Without BA3123F noise enters the power
amplifier inputs directly. With BA3123F, the CMRR of
operational amplifiers 1-A and 2-A eliminates the noise.
Principle of noise elimination:
To obtain the output voltage (eO)
Vi
R4
R3 R4
e2
eO
R2
R1
e1
R1 R2
R1
Vi
From and
eO
-
R2
R1
e1
R1 R2
R1
R4
(R3 R4 )
e2
 
- R2
R1
e1 - e2
R1R4 - R2R3
R1(R3 R4 )
e2
Figure 14. The Principle of Noise Rejection
With BA3123F, the elimination level of
the noise is expressed as:
CMRR = 20log (eO/eI)(eI = e1 = e2)
Therefore, CMRR 41dB can be guaranteed.
Ideally, if R1R4 = R2R3, and e1 = e2, the noise voltage will
be zero. However, due to resistor mismatch, difference in the noise voltages (e1 and e2),
and tolerances in the operational amplifier, a noise voltage is generated.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/12
TSZ02201-0C2C0EZ00400-1-2
13.Nov.2015 Rev.001

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부품번호상세설명 및 기능제조사
BA3123F

Ground Isolation Amplifier

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