SLAS666B January 2010 – October 2018 TLV320DAC3101
PRODUCTION DATA.
The device includes a microphone bias circuit that sources up to 4 mA of current and is programmable to a 2-V, 2.5-V, or AVDD level. The level is controlled by writing to page 1 / register 46, bits D1–D0. Table 6-10 lists this functionality.
D1 | D0 | FUNCTIONALITY |
---|---|---|
0 | 0 | MICBIAS output is powered down |
0 | 1 | MICBIAS output is powered to 2 V |
1 | 0 | MICBIAS output is powered to 2.5 V |
1 | 1 | MICBIAS output is powered to AVDD |
During normal operation, MICBIAS can be set to 2.5 V for better performance. However, based on the model of the selected microphone, optimal performance can be obtained at another setting and therefore the performance at a given setting must be verified.
The lowest current consumption occurs when MICBIAS is powered down. The next-lowest current consumption occurs when MICBIAS is set at AVDD.