TCM320AC56 Datasheet, PDF (18/23 Pages) Texas Instruments – VOICE-BAND AUDIO PROCESSORS (VBAP)

TCM320AC56, TCM320AC57
VOICE-BAND AUDIO PROCESSORS (VBAP)
SLWS016A – JUNE 1996 – REVISED APRIL 1997
PRINCIPLES OF OPERATION
Table 2. Receive-Data Bit Definitions
BIT NO.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
COMPANDED MODE
CD7
CD6
CD5
CD4
CD3
CD2
CD1
CD0
–
–
–
–
–
–
–
–
LINEAR MODE
LD12
LD11
LD10
LD9
LD8
LD7
LD6
LD5
LD4
LD3
LD2
LD1
LD0
V2
V1
V0
Volume control and other control bits always follow the PCM data in time:
Companded Mode: _MSB
(sign bit)
LSB
CD7 CD6 CD5 CD4 CD3 CD2 CD1 CD0
Companded Data
Linear Mode: _MSB
(sign bit)
LSB
LD12 LD11 LD10 LD9 LD8 LD7 LD6 LD5 LD4 LD3 LD2 LD1 LD0
V2 V1 V0
where:
Linear Data
Time
CD7– CD0 = Data word when in companded mode
LD12– LD0 = Data word when in linear mode
V2, V1, V0 = Volume (attenuation control) 000 = maximum volume, 3 dBm0
111 = minimum volume, –18 dBm0
Volume Control
18
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