TS4621B datasheet(29/48 Pages) STMICROELECTRONICS

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TS4621B

Application information

Doc ID 022194 Rev 2

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4.1.3

Control register CR2 - address 2

Mute function: bits MUTE_L and MUTE_R

In the volume register, MUTE_L and MUTE_R are dedicated to enabling the mute function,

independently of the channel. When MUTE_L and MUTE_R are set to 1, the mute function

is enabled on the corresponding channel and the gain is set to -80 dB. When MUTE_L and

MUTE_R are set to 0, the I²C gain level is applied to the channel.

4.1.4

Control register CR3 - address 3

High output impedance mode: bits HiZ_L and HiZ_R

The TS4621B features a high-output impedance mode used, for example, to share the

headphone jack with the audio and composite video signal.

To set this mode, you must set the HIZ bit to 1 for the targeted output in the CR3 register.

At this time, the considered output is in high-impedance mode with the following

characteristics:

●

Maximum input voltage = -1.8 to +1.8 V

●

Output impedance = input impedance detected by the video driver. For an example,

refer to Chapter 3: Electrical characteristics on page 10 or Figure 18.

Table 12.

Volume control register CR2 - address 2

Volume control range: -60 dB to +4 dB

Gain

(in dB)

Gain

(in dB)

0000

-60 dB

10000

-11 dB

0000

-54 dB

10001

-10 dB

0001

-50.5 dB

10010

-9 dB

0001

-47 dB

10011

-8 dB

0010

-43 dB

10100

-7 dB

0010

-39 dB

10101

-6 dB

0011

-35 dB

10110

-5 dB

0011

-31 dB

10111

-4 dB

0100

-27 dB

11000

-3 dB

0100

-25 dB

11001

-2 dB

0101

-23 dB

11010

-1 dB

0101

-21 dB

11011

0 dB

0110

-19 dB

11100

+1 dB

0110

-17 dB

11101

+2 dB

0111

-15 dB

11110

+3 dB

0111

-13 dB

11111

+4 dB

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