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STLC3055N Datasheet(PDF) 6 Page - STMicroelectronics

Part # STLC3055N
Description  WLL and ISDN-TA subscriber line interface circuit
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLC3055N Datasheet(HTML) 6 Page - STMicroelectronics

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Pin description
STLC3055N
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2
Pin description
Figure 2.
Pin connection (top view)
1
2
3
5
6
4
7
8
9
10
17
11
18
19
20
21
22
44
43
42
41
39
40
38
37
36
35
34
28
27
26
24
23
25
33
32
31
29
30
N.C.
GAIN SET
PD
D1
D0
D2
CTTX2
CTTX1
CKTTX
N.C.
DET
RLIM
AGND
CVCC
RSENSE
GATE
VPOS
CSVR
ILTF
RD
IREF
RTH
D00TL488-MOD
12
13
14
15
16
Table 2.
Pin description
Pin
Function
1
D0
Control Interface: input bit 0.
2
D1
Control Interface: input bit 1.
3
D2
Control interface: input bit 2.
4
PD
Power down input. Normally connected to CVCC (or to logic level high).
5
Gain SET
Control gain interface:
0 Level Rxgain = 0dB
Txgain = -6dB
1 Level Rxgain = +6dB Txgain = -12dB
6,7,36,
38,39,40,42
NC
Not connected.
8
DET
Logic interface output of the supervision detector (active low).
9
CKTTX
Metering pulse clock input (12 KHz or 16KHz square wave).
10
CTTX1
Metering burst shaping external capacitor.
11
CTTX2
Metering burst shaping external capacitor.
12
RTTX
Metering pulse cancellation buffer output. TTX filter network should be connected to
this point. If not used should be left open.
13
FTTX
Metering pulse buffer input this signal is sent to the line and used to perform TTX
filtering.
14
RX
4 wire input port (RX input). A 100 k
Ω external resistor must be connected to AGND to
bias the input stage. This signal is referred to AGND. If connected to single supply
CODEC output it must be DC decoupled with proper capacitor.
15
ZAC1
RX buffer output, (the AC impedance is connected from this node to ZAC).
16
ZAC
AC impedance synthesis.


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