PCM5141_16 Datasheet, PDF (44/123 Pages) Texas Instruments – Audio Stereo DAC

PCM5141, PCM5142
SLAS759B – AUGUST 2012 – REVISED JANUARY 2016
8.3.5.3.2 Mode Switching Sequence, from VREF Mode to VCOM Mode
Following register setting sequence is recommended for changing VREF mode to VCOM mode.
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1. Page 0 / Register 2
2. Page 1 / Register 8
3. Page 1 / Register 9　
4.
5. Page 1 / Register 8
6. Page 1 / Register 1
7. Page 0 / Register 2
RQST = 1: Standby mode
RCMF = 1: Fast ramp up → on
VCPD = 0: VCOM is power on
Wait 3 ms with external capacitor = 1 µF
RCMF = 0: Fast ramp up → off
OSEL = 1: VCOM mode
RQST = 0: Normal mode
8.3.5.4 Digital Volume Control
A basic digital volume control with range from 24 dB to –103 dB and mute is available on each channels by Page
0, Resister 61, D(7:0) for L-ch and Register 62, D(7:0) for R-ch. These volume controls all have 0.5-dB step
programmability over most gain and attenuation ranges. Table 29 lists the detailed gain versus programmed
setting for this basic volume control. Volume can be changed for both L-ch and R-ch at the same time or
independently by Page 0, Register 60, D(1:0). When D(1:0) set 00 (default), independent control is selected.
When D(1:0) set 01, R-ch accords with L-ch volume. When D(1:0) set 10, L-ch accords with R-ch volume. To set
D(1:0) to 11 is prohibited.
NOTE
This volume control is done externally to the miniDSP and only influences the analog DAC
output. Any changes to the SDOUT data should be done in the miniDSP process flow.
Table 29. Digital Volume Control Settings
GAIN
SETTING
0
1
:
46
47
48
49
50
51
:
253
254
255
BINARY DATA
0000-0000
0000-0001
:
0010-1110
0010-1111
0011-0000
0011-0001
0011-0010
0011-0011
:
1111-1101
1111-1110
1111-1111
GAIN
(dB)
24.0
23.5
—
1.0
0.5
0.0
–0.5
–1.0
–1.5
—
–102.5
–103
–∞
COMMENTS
Positive maximum
No attenuation (default)
Negative maximum
Negative infinite (Mute)
Ramp-up frequency and ramp-down frequency can be controlled by Page 0, Register 63, D(7:6) and D(3:2) as
shown in Table 30. Also Ramp-up step and ramp-down step can be controlled by Page 0, Register 63 D(5:4) and
D(1:0) as shown in Table 31.
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