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DA7219

Audio codec with Advanced Accessory Detect

Company confidential

Datasheet

Revision 2.1

17-Dec -2015

39 of 123

Table 29: cp_thresh_vdd2 settings in signal size mode (cp_mchange = 11)

cp_thresh_vdd2 setting

Approximate switching

point (Note 6)

Notes

0x00

Never

Not recommended. Always VDD/1 mode

0x01

Never

Not recommended. Always VDD/1 mode

0x02

-32 dBFS

Not recommended. Very power-inefficient as

nearly always VDD/1

0x03

-24 dBFS

Good to use

0x04

-20 dBFS

Good to use

0x05

-17 dBFS

Good to use

0x06

-15 dBFS

Recommended setting

0x07

-13 dBFS

Good to use

0x08

-12 dBFS

Good to use

0x09

-11 dBFS

Good to use

0x0A

-10 dBFS

Good to use

0x0B

-9 dBFS

Not recommended. VDD/2 begins to clip

0x0C

Never

Not recommended. Always VDD/2 mode

0x0D

Never

Not recommended. Always VDD/2 mode

0x0E

Never

Not recommended. Always VDD/2 mode

0x0F

Never

Not recommended. Always VDD/2 mode

Note 6

Full Scale (FS) = 1.6 * VDD_A

9.4.4

Tracking the demands on the charge pump output

There are three points at which the demands on the charge pump can be tracked. These tracking

points are determined by cp_mchange.

9.4.4.1

cp_mchange = 01 (tracking the PGA gain setting)

If cp_mchange = 01, it is the PGA gain setting that is tracked, and which provides the feedback to

boost the clock frequency when necessary.

9.4.4.2

cp_mchange = 10 (tracking the DAC signal setting)

If cp_mchange = 10, it is the size of the DAC signal that is tracked, and which provides the feedback

to boost the clock frequency when necessary.

9.4.4.3

cp_mchange = 11 (tracking the output signal magnitude)

If cp_mchange = 11, it is the magnitude of the output signal that is tracked, and which provides the

feedback to boost the clock frequency when necessary.

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