Datasheet

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TSC2301

SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004

The DAC volume control register is formatted as follows:

Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

MSB LSB

DAMU DAVL DAVL5 DAVL4 DAVL3 DAVL DAVL DAVL DAMU DAVR6 DAVR5 DAVR4 DAVR3 DAVR2 DAVR DAVR

L 6 2 1 0 R 1 0

Bit 15 — DAMUL

Left DAC Mute. This bit is used to mute the input to the left channel DAC. The user can set this bit to mute the

DAC while retaining the previous gain setting in DAVL[6:0], so that the gain control returns to the previous gain

setting when DAMUL is cleared. When the DAMUL bit is set, the left DAC digital gain control soft-steps down to

its lowest level, then all zeroes are sent to the interpolation filter of this DAC. This procedure is used to reduce

any audible artifacts ( pops or clicks) of the mute procedure. This soft-stepping process is reversed when the

DAMUL bit is cleared (unmute).

Table 40. Left DAC Mute

DAMUL Description

0 Left channel DAC is active.

1 Left channel DAC is mute. (default)

Bits [14:8] — DAVL6- DAVL0

Left DAC Volume Control. These 7 bits control the gain setting of the left channel DAC volume control PGA. This

volume control can be programmed from -63.5 dB to 0dB in 0.5-dB steps. Full volume (0dB) corresponds to a

setting of 7Fh. Full attenuation (-63.5 dB) corresponds to 00h. The default volume setting is 0 dB.

DAVL[6:0] = 1111111 (127d) = 0 dB (default)

DAVL[6:0] = 0000000 (000d) = -63.5 dB (Min)

1LSB = 0.5 dB

Bit 7 — DAMUR

Right DAC Mute. This bit is used to mute the input to the right channel DAC. The user can set this bit to mute the

DAC while retaining the previous gain setting in DAVR[6:0], so that the gain control returns to the previous gain

setting when DAMUR is cleared. When the DAMUR bit is set, the left DAC digital gain control soft-steps down to

its lowest level, then all zeroes are sent to the interpolation filter of this DAC. This procedure is used to reduce

any audible artifacts ( pops or clicks) of the mute procedure. This soft-stepping process is reversed when the

DAMUR bit is cleared (unmute).

Table 41. Right DAC Mute

DAMUR Description

0 Right channel DAC is active.

1 Right channel DAC is mute. (default)

Bits [6:0] — DAVR6- DAVR0

Right DAC Volume Control. These 7 bits control the gain setting of the right channel DAC volume control. This

volume control can be programmed from -63.5 dB to 0 dB in 0.5-dB steps. Full volume (0 dB) corresponds to a

setting of 7Fh. Full attenuation (-63.5 dB) corresponds to 00h. The default volume setting is 0 dB.

DAVR[6:0] = 1111111 (127d) = 0 dB (default)

DAVR[6:0] = 0000000 (000d) = -63.5 dB (Min)

1LSB = 0.5 dB