L3037 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L3037' PDF : 22 Pages View PDF
L3037
PIN DESCRIPTION
Unless otherwise specified all the diagrams in this datasheet refers to the PLCC44 Pin Connection.
PQFP44
No.
39
40
41
42
43
44
2
PLCC44
No.
1
2
3
4
5
6
7
Pin
VCC
IL TF
RDC
CF
BASE
BGND
VREG
3
8
STIP
4
9
TIP
1, 28 10 to 14 VB
32 to 36
8
15
RING
9
16 SRING
11
17
CRT
12
18 ODET
13
19
RGIN
14
20
OGK
15
21
GST
16
22
D1
17
23
D0
18
24
LIM
19
25
VSS
20
26
REL
21
27 CREV
22
28
23
29
24
30
25
31
30
37
31
38
32
39
33
40
34
41
35
42
37
43
38
44
2,5 to 7,
10,26,
–
27, 29,36
GREL
CAC
RS
ZB
Tx
Rx
ZAC
TTXIN
RTTX
ACFD
AGND
IREF
N.C.
Description
Positive Power Supply (+5V)
Transversal Line Current Image ((IA + IB) / 200)
DC feedback input (the RDC resistor is connected from this node to ILTF)
Battery voltage ripple rejection (CSVR capacitor is connected from this node to BGND).
Driver for external transistor base
Battery ground
Regulated Voltage. Provides negative power supply for the power amplifier.
(connected to emitter of the external transistor.)
Input of A power amplifier (when no compensation of ext. ptc resistor mismatch is
requested it must be shorted to the TIP lead).
A line termination output (IA is the current sourced from this pin).
Battery Supply
PLCC44: All pins are internally connected together.
PQFP44: It is mandatory to short pin 1 and pin 28 as closed as possible to the device.
B line termination output (IB is the current sunk into this pin).
Input of B power amplifier (when no compensation of ext. ptc resistor mismatch is
requested it must be shorted to the RING lead).
Ring trip and ground key capacitor
ON/OFF hook and RING TRIP output (when disable is internally pulled up)
Ring input signal. (when open is internally pulled to GND)
Ground key output (when disable is internally pulled up)
A open command (when open is internally pulled down)
Bit 1
Bit 0
Current Limitation Program. (when open is internally forced to 44mA current limitation)
Negative Power Supply (-5V)
Ring relay driver output
Reverse polarity transition time control. One proper capacitor connected between this
pin and AGND is setting the reverse polarity transition time. If reverse polarity feature
is not used must be open or connected to AGND through a filter capacitor.
Ground reference for ring relay driver
AC feedback input (ACDC split capacitor is connected from this node to ILTF)
Protection resistors image (the image resistor is connected from this node to ACFD)
Balance network for 2 to 4 wire conversion (the balance impedance ZB is connecetd
from this node to AGND. The ZA impedance is connected from this node to ZAC)
4 wire output port (Tx output)
4 wire receiving port. (Rx input)
Rx buffer output (the AC impedance is connected from this node to ACFD)
Metering input port/Vdrop programming. If not used should be connected to AGND.
Metering cancellation network. If not used should be left open.
AC impedance synthesis
DC and AC signal ground
Voltage Reference Output
Not connected
4/22
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