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STLC3055N bảng dữ liệu(PDF) 3 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
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STLC3055N
Table 3. Operating Range
(1) Vbat is self generated by the on chip DC/DC converter and can be programmed via RF1 and RF2.
RF1 and RF2 shall be selected in order to fulfil the a.m limits (see External Components Table page 11)
Table 4. Thermal Data
Table 5. Pin Description
Symbol
Parameter
Value
Unit
Vpos
Positive Supply Voltage
5.5 to +12
V
A/BGND
AGND to BGND
-100 to +100
mV
Vdig
Pin D0, D1, D2, DET, CKTTX, PD
-0.25 to 5.25
V
Top
Ambient Operating Temperature Range
-40 to +85
°C
Vbat
(1)
Self Generated Battery Voltage
-74 max.
V
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction to Ambient
Typ.
60
°C/W
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.
8DET
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 100k
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.
17
RS
Protection resistors image (the image resistor is connected from this node to ZAC).
18
ZB
Balance Network for 2 to 4 wire conversion (the balance impedance ZB is connected from
this node to AGND. ZA impedance is connected from this node to ZAC1).
19
CAC
AC feedback input, AC/DC split capacitor (CAC).
20
TX
4 wire output port (TX output). The signal is referred to AGND. If connected to single supply
CODEC input it must be DC decoupled with proper capacitor.
21
VF
Feedback input for DC/DC converter controller.


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