L3037FN datasheet(4/22 Pages) STMICROELECTRONICS

4 / 22 page

PIN DESCRIPTION

Unless otherwise specified all the diagrams in this datasheet refers to the PLCC44 Pin Connection.

PQFP44

No.

PLCC44

No.

Description

VCC

Positive Power Supply (+5V)

ILTF

Transversal Line Current Image ((IA +IB) / 200)

RDC

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).

BASE

Driver for external transistor base

BGND

Battery ground

VREG

Regulated Voltage. Provides negative power supply for the power amplifier.

(connected to emitter of the external transistor.)

STIP

Input of A power amplifier (when no compensation of ext. ptc resistor mismatch is

requested it must be shorted to the TIP lead).

TIP

A line termination output (IA is the current sourced from this pin).

1, 28

10 to 14

32 to 36

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.

RING

B line termination output (IB is the current sunk into this pin).

SRING

Input of B power amplifier (when no compensation of ext. ptc resistor mismatch is

requested it must be shorted to the RING lead).

CRT

Ring trip and ground key capacitor

ODET

ON/OFF hook and RING TRIP output (when disable is internally pulled up)

RGIN

Ring input signal. (when open is internally pulled to GND)

OGK

Ground key output (when disable is internally pulled up)

GST

A open command (when open is internally pulled down)

Bit 1

Bit 0

LIM

Current Limitation Program. (when open is internally forced to 44mA current limitation)

VSS

Negative Power Supply (-5V)

REL

Ring relay driver output

CREV

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.

GREL

Ground reference for ring relay driver

CAC

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)

ZAC

Rx buffer output (the AC impedance is connected from this node to ACFD)

TTXIN

Metering input port/Vdrop programming. If not used should be connected to AGND.

RTTX

Metering cancellation network. If not used should be left open.

ACFD

AC impedance synthesis

AGND

DC and AC signal ground

IREF

Voltage Reference Output

2,5 to 7,

10,26,

27, 29,36

–

N.C.

Not connected

L3037

4/22

L3037FN 数据表(PDF) 4 Page - STMicroelectronics

L3037FN 数据表(HTML) 4 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

数据表下载