st5080d STMicroelectronics, st5080d Datasheet - Page 17

• Manufacturer Part Number: st5080d
• Description: Piafe Programmable Isdn Audio Front End
• Manufacturer: STMicroelectronics

Table 9: Control Register CR7 Functions
*:
(1):
X
Table 10: Control Register CR8 Functions
Table 11: Control Register CR9 Functions
msb
msb
f17
f27
7
0
0
0
0
0
0
0
0
1
1
7
7
Tone gain
f16
f26
6
0
0
0
0
1
1
1
1
X
X
6
6
state at power on initialization
value provided if f1 or f2 is selected alone.
if f1 and f2 are selected in the summed mode, f1=1.34 V
Output generator is 2.4 V
reserved: write 0
f15
f25
X
X
5
0
0
1
1
0
0
1
1
5
5
f14
f24
4
0
1
0
1
0
1
0
1
0
1
4
4
f13
f23
F1
3
0
0
1
1
3
3
f12
f22
F2
pp
2
0
1
0
1
2
2
f11
f21
SN
1
0
1
1
1
DE
f10
f20
lsb
lsb
0
0
1
0
0
f1 and f2 muted
f2 selected
f1 selected
f1 and f2 in summed mode
Squarewave signal selected
Sinewave signal selected
Normal operation
Tone / Ring Generator connected to
Transmit path
Binary equivalent of the decimal number used to calculate f1
Binary equivalent of the decimal number used to calculate f2
Attenuation
....0 dB *
-12 dB
-15 dB
-18 dB
-21 dB
-24 dB
-27 dB
- 9 dB
-3 dB
-6 dB
pp
while f2=1.06 V
pp
.
Function
Function
Function
...2.4 (1)
f1 V
1.70
1.20
0.85
0.60
0.43
0.30
0.21
0.15
0.10
pp
....1.9 (1)
f2 V
1.34
0.95
0.67
0.47
0.34
0.24
0.17
0.12
0.08
ST5080A
*
*
*
pp
17/32