LUCL9310GP-D datasheet(13/60 Pages) AGERE

13 / 60 page

Data Sheet

July 2001

Full-Feature SLIC, Ringing Relay, and Test Access Device

L9310 Line Interface and Line Access Circuit

Agere Systems Inc.

Pin Information (continued)

Table 1. Pin Descriptions (continued)

Symbol

Type

Name/Function

ITR

Transmit Gain. A current output which is proportional to the differential current

flowing from tip to ring. Input to AX amplifier. Connect a resistor from this node to

VTX to set transmit gain to 300

Ω. Hybrid reject of meter pulse is done by a resis-

tor from this node to PPMOUT. Gain shaping for termination impedance with a

COMBO I codec is also achieved with a network from this node to VTX.

TXN

Transmit ac Input (Inverting). For higher-voltage meter pulse signals (5 Vrms),

connect a network to this node for meter pulse filtering. If lower-voltage meter

pulse is used and meter pulse rejection is done via PPMOUT, this node is not

used. This node has an internal connection to VREF; thus, it may be left floating if

unused.

TXI

Transmit ac Input (Noninverting). Connect a 0.1

µF capacitor from this pin to

VTX for dc blocking.

VITR

Transmit ac Output Voltage. The output is a voltage that is directly proportional

to the differential ac tip/ring current. This output is connected via a proper inter-

face network to the codec.

RCVP

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

the ac differential voltage on tip and ring.

RCVN

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

differential voltage on tip and ring.

AGND

Analog Ground. Ground return for VCC current.

VCC

5 V Analog Power Supply. 5 V supply for analog circuitry.

LUCL9310GP-D Datasheet(PDF) 13 Page - Agere Systems