SLOS948 February 2019 TAS6424M-Q1
In many automotive audio applications, the same head unit must drive either a speaker (with several ohms of impedance) or an external amplifier input (with several kiloohms of impedance). The design is capable of supporting both applications and has special line-drive gain and diagnostics. Coupled with the high switching frequency, the device is well suited for this type of application. Set the desired channel in line driver mode through I2C register 0x00, the externally connected amplifier must have a differential impedance from 600 Ω to 4.7 kΩ for the DC line diagnostic to detect the connected external amplifier. Figure 78 shows the recommended external amplifier input configuration.