DatasheeDatasheett Ground Isolation Amplifier BA3121F General Description Key Specifications BA3121F is a ground isolation amplifier developed for Power Supply Voltage Range: 4V to 18V car audio applications. This IC efficiently eliminates Quiescent Current: 9.0mA (Typ) problems caused by wiring resistance and removes High Common-mode Rejection Ratio(1kHz): noise generated by other electrical devices used in 57dB (Typ) automobiles. The external capacitor values required for Low Noise: V = 3.5Vrms(Typ) NO this IC are so small that it allows for compact and Low Distortion: THD = 0.002% (Typ) reliable set design. Operation temperature range: -30C to +85C Features Package W(Typ) x D(Typ) x H(Max) Large Capacitors not Required High Common-mode Rejection Ratio Low Noise Low Distortion Two Channels Applications Car audio systems SOP8 5.00mm x 6.20mm x 1.71mm Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0C2C0EZ00390-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/12 TSZ2211114001 13.Nov.2015 Rev.001 BA3121F Block Diagram and Pin Configuration TOP VIEW VM1 VM2 Absolute Maximum Ratings (Ta = 25 C) Parameter Symbol Limit Unit Power Supply Voltage V 18 V CC (Note 1) Power Dissipation Pd 0.45 W Operation Temperature Topr -30 to +85 C Storage Temperature Tstg -55 to +125 C (Note 1) Reduced by 4.5mW in Ta of 1C over 25C . Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. Recommended Operating Conditions (Ta = 25C) Parameter Symbol Min Typ Max Unit Power Supply Voltage VCC 4 12 18 V Electrical Characteristics (Unless otherwise noted, Ta = 25 C, VCC = 12V, f = 1kHz, Rg = 1.8k) Parameter Symbol Unit Conditions Min Typ Max Quiescent Current IQ 5.6 9.0 14.0 mA VIN0Vrms Output Noise Voltage VNO 3.5 8.0 Vrms BPF 20Hz-20kHz Voltage Gain GV -1.5 -0.04 +1.5 dB VOUT -10dBm, Rg 0 Maximum Output Voltage VOM 1.8 2.0 Vrms THD0.1 , VCC8V Total Harmonic Distortion THD 0.002 0.02 V 0.7Vrms OUT Common-mode Rejection Ratio CMRR 41 57 - dB Common-made Voltage VCM 2.5 3.75 - Vrms VCC8V,CMRR40dB fRR100Hz,VRR-10dBm, Ripple Rejection Ratio RR 72 80 - dB Rg 0 V -10dBm, IN Channel Separation CS - 82 - dB Rg 1.8k/OPEN Slew Rate SR - 2.0 - V/S Input Resistance RIN 44 55 66 k www.rohm.com TSZ02201-0C2C0EZ00390-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/12 TSZ2211115001 13.Nov.2015 Rev.001