LUCL9500AGF-D datasheet(8/32 Pages) AGERE

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Preliminary Data Sheet

September 2001

High-Voltage Ringing SLIC for VoIP Applications

L9500A

Agere Systems Inc.

Pin Information (continued)

Table 1. Pin Descriptions

28-Pin

PLCC

48-Pin

MLCC

Symbol

Type

Name/Function

143

NSTAT

Loop Closure Detector Output—Ring Trip Detector Output.

When low, this logic output indicates that an off-hook condition

exists or ringing is tripped or a ring ground has occurred.

245

VITR

Transmit ac Output Voltage. Output of internal AAC amplifier.

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

ential ac tip/ring current.

RCVP

Receive ac Signal Input (Noninverting). This high-impedance

input controls to ac differential voltage on tip and ring. This node

is a floating input.

RCVN

Receive ac Signal Input (Inverting). This high-impedance

input controls to ac differential voltage on tip and ring. This node

is a floating input.

RINGINN

Power Ring Signal Input. Couple to a sine wave or lower crest

factor low-voltage ring signal. The input here is amplified to pro-

vide the full power ring signal at tip and ring. This signal may be

applied continuously, even during nonringing states.

RINGINP

Power Ring Signal Input. Couple to a sine wave or lower crest

factor low-voltage ring signal. The input here is amplified to pro-

vide the full power ring signal at tip and ring. This signal may be

applied continuously, even during nonringing states.

DCOUT

dc Output Voltage. This output is a voltage that is directly pro-

portional to the absolute value of the differential tip/ring current.

This is used to set ring trip threshold.

CF2

—

Filter Capacitor. Connect a capacitor from this node to ground.

910

CF1

—

Filter Capacitor. Connect a capacitor from this node to CF2.

RTFLT

—

Ring Trip Filter. Connect this lead to DCOUT via a resistor and

to AGND with a capacitor to filter the ring trip circuit to prevent

spurious responses. A single-pole filter is needed.

VREF

SLIC Internal Reference Voltage. Output of internal 1.5 V ref-

erence voltage.

AGND

GND

Analog Signal Ground.

VCC

PWR

Analog Power Supply. User choice of 5 V or 3.3 V nominal

power or supply.

VBAT1

PWR

Battery Supply 1. High-voltage battery.

VBAT2

PWR

Battery Supply 2. Lower-voltage battery.

BGND

GND

Battery Ground. Ground return for the battery supplies.

3, 4, 5, 7, 9, 11,

14, 17, 18, 20,

22, 27, 29, 30,

32, 36, 37, 40,

42, 44, 46

—

No Connection.

VPROG

Current-Limit Program Input. Connect ground to this pin to set

current limit to 25 mA; leave this pin open to set current limit to

40 mA.

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