AS3502 Datasheet, PDF (18/29 Pages) ams AG – 13-BIT LINEAR FEATURE CODEC WITH ANALOGUE FRONTEND

AS3502
13) VOLUME CONTROL REGISTER 2
This register contains the remaining two bits of the second frequency coefficient, and coarse and fine tone volume
control data for the receive direction.
V2
D7
D6
D5
D4
D3
D2
D1
D0
Name
0
0
V23
V22
V21
V20
F29
F28
Default
X
X
X
X
X
X
X
X
Bit No
D5-D3
D2
D1-D0
Symbol Name and Description
V23-V21
Receive Tone Coarse Volume Control ( V2C)
V23 V22
V21
Attenuation
0
0
0
- 10 dB
0
0
1
- 16 dB
0
1
0
- 22 dB
0
1
1
- 28 dB
1
0
0
- 34 dB
1
0
1
- 40 dB
V20
F29-F28
Sine Tone Fine Volume Control (V2F)
V20
Attenuation
0
0 dB
1
- 2.5 dB
In transmit direction the sineoutput value depends on V2F and DGX:
VOUT_SINE = 3.8 dBm + V2F + DGX (dBm0)
VOUT_{DTMF ROW TONE} = -2.2dBm + DGX (dBm0)
VOUT_{DTMFCOLUMN TONE} = -4.7dBm + DGX (dBm0)
In receive direction the sine output value on earpiece and speaker depends on V2C, V1
and AGR:
VOUT_EP= 3.8 dBm + V2C + V2F+ AGR (dBm)
VOUT_SP= 3.8 dBm + V2C + V2F+ 3dB (dBm)
These bits are the two most significant bits of the 10-bit frequency coefficient.
REV. M
Page 18
September 1998