Agere Systems Inc.

5

Data Sheet

November 2001

with Reverse Battery and PPM

L9217A/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

PPMIN

I

Receive PPM Signal Input. This high-impedance input controls the PPM differential

voltage on tip and ring. The PPM signal may be present at this pin at all times: how-

ever, PPM will only be transmitted to tip and ring if the appropriate PPM state is cho-

sen. ac couple the PPM signal to this node.

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

ential 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

OVH

I

PPM Overhead. Connect a resistor from this node to ground to set the overhead volt-

age during PPM high overhead modes.

28

PPMOUT

O

PPM Signal Output. Connect a resistor from this node to TG for hybrid cancellation

of the periodic pulse metering (PPM) signal.