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Product Detailed Parameters
- Description：IC AMP CLASS AB STEREO 8DIP
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tube
- Type：Class AB
- Output Type：2-Channel (Stereo)
- Max Output Power x Channels @ Load：-
- Voltage - Supply：4V ~ 18V
- Features：-
- Mounting Type：Through Hole
- Supplier Device Package：8-DIP
- Package / Case：8-DIP (0.300", 7.62mm)
- Operating Temperature：-30°C ~ 85°C (TA)
- Grade：-
- Qualification：-
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Overview
The BA3121 is a ground isolation amplifier developed for car audio applications. It efficiently eliminates problems caused by wiring resistance and removes noise generated by other electrical devices used in automobiles. The IC requires small external capacitor values, allowing for compact and reliable set design. It features two channels with high common-mode rejection ratio (57dB typ. at f = 1kHz), low noise (VNO = 3.5μVrms Typ.), and low distortion (THD = 0.002% Typ.).
Feature Summary
- High common-mode rejection ratio to eliminate chassis noise.
- Low noise and low distortion performance.
- Requires small external capacitors for compact design.
Applications
- Car audio systems
Procurement Notes
Verify the specific package suffix (e.g., F, N) against the required footprint. Confirm availability status as some variants may be discontinued. Ensure peripheral components match the recommended operating conditions for stable ripple rejection and CMMR performance.
Selection Notes
Select based on the required channel count and package type. Consider the need for high common-mode rejection to mitigate automotive electrical noise. Verify that the external capacitor ratios meet the 2:1 requirement for pin 2 and pin 6 to maintain stable ripple rejection.
Part Context
The BA3121 belongs to ROHM's Audio ICs line, specifically designed as a ground isolation amplifier. It utilizes the common-mode rejection characteristics of operational amplifiers to prevent electrical noise from entering power amplifier inputs via the chassis in earthed car-audio systems.
Replacement Considerations
BA3121F and BA3121N are direct functional equivalents within the same family, differing primarily in package configuration.
FAQ
How does the BA3121 eliminate noise?
It uses the common-mode rejection characteristics of its internal operational amplifiers to cancel out noise voltages entering the system via the chassis.
What is the typical common-mode rejection ratio?
The typical CMRR is 57dB at a frequency of 1kHz.
