SSM2804CBZ-R7 datasheet(31/36 Pages) AD

31 / 36 page

SSM2804

Rev. 0 | Page 31 of 36

ALC CONTROL 2, ADDRESS 0x0B

Table 36. ALC Control 2 Register Bit Map

ALCEN

COMP[1:0]

ALCLV_FIX

ALCLV[3:0]

Table 37. ALC Control 2 Register Bit Descriptions

Bit Name

Description

Settings

ALCEN

ALC enable

0 = ALC disabled (default)

1 = ALC enabled

COMP[1:0]

Compressor setting (see the Soft-Knee

Compression section for more information)

00 = Compression Mode 1 (1:4 to 1:∞)

01 = Compression Mode 2 (1:1.7 to 1:4 to 1:∞)

10 = Compression Mode 3 (1:1.3 to 1:2.5 to 1:∞)

11 = Limiter mode (1:∞)

ALCLV_FIX

ALC threshold mode setting

0 = supply tracking (threshold is a constant fraction of supply voltage)

1 = fixed power (threshold is a fixed voltage)

ALCLV[3:0]

ALC threshold level setting

See Table 38

Table 38. ALC Threshold Levels

Supply Tracking Threshold (% of PVDD)

Fixed Power Threshold (V)

ALCLV[3:0] Value

(ALCLV_FIX = 0)

(ALCLV_FIX = 1)

0000

2.74

0001

2.89

0010

3.04

0011

3.19

0100

3.34

0101

3.50

0110

3.65

0111

3.80

1000

3.95

1001

4.10

1010

4.25

1011

102

4.40

1100

108

4.56

1101

114

4.71

1110

122

4.86

1111

130

5.01

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