LM4985, LM4985TMEVAL

www.ti.com

SNAS346B – MAY 2006 – REVISED MAY 2006

Volume Control Settings Binary Values

The minimum volume setting is set to –76dB when 00000 is loaded into the volume control register. Incrementing

the volume control register in binary fashion increases the volume control setting, reaching full scale at 11111.

Table 2 shows the value of the gain for each of the 32 binary volume control settings.

Table 2. Binary Values for the Different Volume Control Gain Settings

Gain

B4

B3

B2

B1

B0

18

1

1

1

1

1

17

1

1

1

1

0

16

1

1

1

0

1

15

1

1

1

0

0

14

1

1

0

1

1

13

1

1

0

1

0

12

1

1

0

0

1

10

1

1

0

0

0

8

1

0

1

1

1

6

1

0

1

1

0

4

1

0

1

0

1

2

1

0

1

0

0

0

1

0

0

1

1

–2

1

0

0

1

0

–4

1

0

0

0

1

–6

1

0

0

0

0

–8

0

1

1

1

1

–10

0

1

1

1

0

–12

0

1

1

0

1

–14

0

1

1

0

0

–16

0

1

0

1

1

–18

0

1

0

1

0

–21

0

1

0

0

1

–24

0

1

0

0

0

–27

0

0

1

1

1

–30

0

0

1

1

0

–34

0

0

1

0

1

–38

0

0

1

0

0

–44

0

0

0

1

1

–52

0

0

0

1

0

–62

0

0

0

0

1

–76

0

0

0

0

0

Revision History

Rev

Date

Description

1.0

05/17/06

Initial WEB release.

Copyright © 2006, Texas Instruments Incorporated

Submit Documentation Feedback

27

Product Folder Links: LM4985 LM4985TMEVAL