Texas Instruments PCM5122 Evaluation Module PCM5122EVM-U PCM5122EVM-U Datenbogen
Produktcode
PCM5122EVM-U
SLAS759A – AUGUST 2012 – REVISED SEPTEMBER 2012
Miscellaneous Coefficients
Table 40. Miscellaneous Coefficients
Coefficient
Register
Description
DRC_MB_1_DataBlock
C175 (Pg 49, Reg 108, 109, 110, 111)
DRC_MB_1_CoeffBlock
C176 (Pg 49, Reg 112, 113, 114, 115)
Volume_ZeroX_1_DataBlock
C177 (Pg 49, Reg 116, 117, 118, 119)
Volume_ZeroX_1_CoeffBlock
C178 (Pg 49, Reg 120, 121, 122, 123)
plus_one
C179 (Pg 49, Reg 124, 125, 126, 127)
ADD_OF_filter_in_L
C180 (Pg 50, Reg 8, 9, 10, 11)
ADD_OF_filter_in_R
C181 (Pg 50, Reg 12, 13, 14, 15)
Analog Gain Control
Analog gain control can be selected between 2V
rms
FS (0dB) or 1V
rms
FS (-6dB). Gain is controlled via hardware
by the AGNS pin, and via software (SPI/I
2
C), Page 1, Register 2, D4(L-ch) / D0(R-ch).
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.
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.
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.
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.
Table 41. Digital Volume Control Settings
Gain
Gain
Binary Data
Comments
Setting
(dB)
0
0000-0000
24.0
Positive maximum
1
0000-0001
23.5
:
:
:
46
0010-1110
1.0
47
0010-1111
0.5
48
0011-0000
0.0
No attenuation (default)
49
0011-0001
- 0.5
50
0011-0010
- 1.0
51
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
shown in
. 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 42. Ramp Up or Down Frequency
Ramp up
Ramp down
Every N f
S
Comments
Every N f
S
Comments
speed
frequency
00
1
Default
00
1
Default
01
2
01
2
10
4
10
4
62
Copyright © 2012, Texas Instruments Incorporated
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