Agere Systems Inc.

5

Data Sheet

November 2001

with Reverse Battery and Dual Current Limit

L9219A/G Low-Cost Line Interface

Table 1. Pin Descriptions (continued)

PLCC

Symbol

Type

Description

7

LCTH

I

Loop Closure Threshold Input. Connect a resistor to DCOUT to set off-hook

threshold.

8

DCOUT

O

dc Output Voltage. This output is a voltage that is directly proportional to the abso-

lute value of the differential tip/ring current.

9

—

Battery Supply. Negative high-voltage power supply.

10

PR

I/O

Protected Ring. The output of the ring driver amplifier and input to loop sensing cir-

cuitry. Connect to the loop through overvoltage protection.

11

CF2

—

Filter Capacitor 2. Connect a 0.1

µF capacitor from this pin to AGND.

12

CF1

—

Filter Capacitor 1. Connect a 0.47

µF capacitor from this pin to pin CF2.

13

B2

I

State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B2 has internal pull-down.

14

B1

I

State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B1 has internal pull-down.

15

B0

I

State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B0 has internal pull-down.

16

AGND

—

Analog Signal Ground.

17

BGND

—

Battery Ground. Ground return for the battery supply.

18

PT

I/O

Protected Tip. The output of the tip driver amplifier and input to loop sensing cir-

cuitry. Connect to loop through overvoltage protection.

19

RTSN

I

Ring Trip Sense Negative. Connect this pin to the ringing generator signal through a

high-value resistor.

20

RTSP

I

Ring Trip Sense Positive. Connect this pin to the ring relay and the ringer series

resistor through a high-value resistor.

21

NC

—

No Connect.

22

NSTAT

O

Ring Trip Detector Output/Loop Detector Output. When low, this logic output indi-

cates that ringing is tripped or that an off-hook condition exists.

23

VITR

O

ac Output Voltage. The voltage at this point is directly proportional to the differential

tip/ring current.

24

TXI

I

ac/dc Separation. Connect a 0.1

µF capacitor from this point to VTX.

25

VTX

O

ac and dc Output Voltage. This output is a voltage that is directly proportional to the

differential tip/ring current.

26

TG

—

Transmit Gain. Connect an 8.06 k

Ω from TG to VTX to set the transmit gain of the

SLIC.

27

TSD

O

Thermal Shutdown. When high, this logic output indicates the device is in thermal

shutdown.

28

NC

—

No Connect.