Datasheet

ADAU1381

Rev. B | Page 49 of 84

This register manages the power consumption for the record

path. In particular, the current distribution for the mixer boosts,

ADC, front-end mixer, and PGAs can be set in one of four

modes. The four modes of operation available that affect the

performance of the device are normal operation, power saving,

enhanced performance, and extreme power saving. Normal

operation has a base current of 2.5 A, enhanced performance

has a base current of 3 A, power saving has a base current of

a 2 A, and extreme power saving has a base current of 1.5 A.

Enhanced performance offers the highest performance, but

with the trade-off of higher power consumption.

Bits[6:5], Mixer Amplifier Boost

These bits set the power mode of operation for the front-end

mixer boost. With higher AVDD1 levels, distortion may become

an issue affecting performance. Each boost level enhances the

THD + N performance at 3.3 V AVDD1.

Bits[4:3], ADC Bias Control

These bits set the bias current for the ADCs based on the mode

of operation selected.

Bits[2:1], Front-End Bias Control

These bits set the bias current for the PGAs and mixers in the

front-end record path.

Table 36. Record Power Management Register

Bits Description Default

7 Reserved

[6:5] Mixer amplifier boost 00

00: normal operation

01: Boost Level 1

10: Boost Level 2

11: Boost Level 3

[4:3] ADC bias control 00

00: normal operation

01: extreme power saving

10: power saving

11: enhanced performance

[2:1] Front-end bias control 00

00: normal operation

01: extreme power saving

10: power saving

11: enhanced performance

0 Reserved