PCM5142 datasheet(44/123 Pages) TI2

44 / 123 page

PCM5141, PCM5142

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

www.ti.com

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.

1. Page 0 / Register 2

RQST = 1: Standby mode

2. Page 1 / Register 8

RCMF = 1: Fast ramp up

→ on

3. Page 1 / Register 9

VCPD = 0: VCOM is power on

Wait 3 ms with external capacitor = 1 µF

5. Page 1 / Register 8

RCMF = 0: Fast ramp up

→ off

6. Page 1 / Register 1

OSEL = 1: VCOM mode

7. Page 0 / Register 2

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

BINARY DATA

COMMENTS

SETTING

(dB)

0000-0000

24.0

Positive maximum

0000-0001

23.5

—

0010-1110

1.0

0010-1111

0.5

0011-0000

0.0

No attenuation (default)

0011-0001

–0.5

0011-0010

–1.0

0011-0011

–1.5

—

253

1111-1101

–102.5

254

1111-1110

–103

Negative maximum

255

1111-1111

–

∞

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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