Automotive-qualified audio line receiver achieves a high common-mode rejection ratio

The INA1650-Q1 SoundPlus audio line receiver, from Texas Instruments, achieves an extremely high common-mode rejection ratio (CMRR) of 91dB while maintaining ultra-low THD+N of –119dB at 1kHz for 20dBu signal levels. Unlike other line receiver products, the device is characterized over temperature and tested in production to deliver consistent performance in a wide variety of applications. The device operates over a very-wide-supply range of ±2.25V to ±12V, on 10.5mA of supply current. In addition to the two line-receiver channels, a buffered mid-supply reference output is included to allow the device to be configured for dual or single-supply applications. The mid-supply output can be used as a bias voltage for other analog circuitry in the signal chain. The device features a unique internal layout for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded. This device is specified from –40C to +125C.