CS4245 datasheet(45/54 Pages) CIRRUS

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CS4245

6.9.2

Analog Input Selection (Bits 2:0)

Function:

These bits are used to select the input source for the PGA and ADC. Please see Table 15 below.

6.10 DAC Channel A Volume Control - Address 0Ah

See 6.11 DAC Channel B Volume Control - Address 0Bh

6.11 DAC Channel B Volume Control - Address 0Bh

6.11.1 Volume Control (Bits 7:0)

Function:

The digital volume control allows the user to attenuate the signal in 0.5 dB increments from 0 to

-127 dB. The Vol0 bit activates a 0.5 dB attenuation when set, and no attenuation when cleared. The

Vol[7:1] bits activate attenuation equal to their decimal equivalent (in dB). Example volume settings

are decoded as shown in Table Table 16. The volume changes are implemented as dictated by the

DACSoft and DACZeroCross bits in the DAC Control 2 register (see section 6.12.1).

Table 14. PGA Soft Cross or Zero Cross Mode Selection

PGASoft

PGAZeroCross

Mode

Changes to affect immediately

Zero Cross enabled

Soft Ramp enabled

Soft Ramp and Zero Cross enabled (default)

Table 15. Analog Input Multiplexer Selection

Sel2

Sel1

Sel0

PGA/ADC Input

Microphone Level Inputs (+32 dB Gain Enabled)

Line Level Input Pair 1

Line Level Input Pair 2

Line Level Input Pair 3

Line Level Input Pair 4

Line Level Input Pair 5

Line Level Input Pair 6

Reserved

76543

210

Vol7

Vol6

Vol5

Vol4

Vol3

Vol2

Vol1

Vol0

Table 16. Digital Volume Control Example Settings

Binary Code

Volume Setting

00000000

0 dB

00000001

-0.5 dB

00101000

-20 dB

00101001

-20.5 dB

11111110

-127 dB

11111111

-127.5 dB

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