stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 38

• Manufacturer Part Number: stlc3040
• Description: Subscriber Line Interface Codec Filter, Cofislic
• Manufacturer: STMicroelectronics

STLC3040
GAIN TRACKING Rx/Tx
B[1..8] = 0
Z[1..3] = 0
Reference frequency = 1kHz
Reference level on DD = -10dBm0 (or expected
value at Vout, pin 26, in the range of
14.39mVrms)
Figure 15. (Valid for 0 < T
38/49
R
X
CR[ 1] = 00
CR[ 2] = 00
CR[ 3] = 00
CR[ 4] = F9
CR[ 5] = 60
CR[ 6] = 50
K = 1000h
GR = FFh
GX = FFh
| 1000h
| 0h
| 0h
| 0h
| 1000h
| 0h
| 0h
| 0h
TRANSMIT:
RECEIVE:
-0.25
(dB)
0.25
-0.5
-1.4
1.4
0.5
-0.25
(dB)
0.25
-0.5
-1.4
2
1.4
0.5
G
-1
-2
2
1
G
amb
-1
-2
(4096) |
(0)
(0)
(0)
(4096) |
(0)
(0)
(0)
1
0
0
-70
-70
< 70°C)
CR[ 7] = 1C
CR[10] = 00
CR[11] = 10
CR[12] = 03
CR[ 9] = 2F
CR[ 8] = 08
|
|
|
|
|
|
(4096)
-60
(255)
(255)
-60
D96TL262
-55
-55
D96TL258A
-50
-50
-40
-40
Voutref = voltage on Vout with DDref = -10dBm0
Voutmes = voltage on Vout with -55dBm0 <
DDmes < 3dBm0
Rx gain tracking = 20 log (Vout mes / Voutref)
- (DDmes - DDref)
Tx gain tracking = starting from the same consid-
eration of the absolute gain.
DUref = dBm0 level at DU with (target DU) ref = -
10dBm0
DUmes = dBm0 level at DU with -55dBm0 < (tar-
get DU) mes < 3dBm0
Tx gain tracking = (DUmes - DUref) - ((target
DU)mes - (target DU)ref)
INPUT LEVEL (dBm0)
-30
INPUT LEVEL (dBm0)
-30
target DU represents the dBm0 level expected on DU
with a certain set of coefficient and a Vrac of
41.4Vrms
VRac_ref is the amplitude of the sine wave (1kHz) to
be applied on RAC (pin 16) in order to expect on DU
a Vpcm dBm0 level with the same set of coefficient.
target DU (dBm0) = 3.14 + 20
sqr(2)) / 1.514) 16 (K/8192) (X[1]/8192) (GX/256)
VRac_ref = 41.4mV 10^ ((Vpcm - target DU)/20)
0.966)
-20
-20
-10
-10
0
0
3
3
10
10
((0.0414
3
(2