6

Agere Communications Inc.

Data Sheet

September 2001

L7585G Full-Feature, Low-Power SLIC and Switch

Table 1. Pin Descriptions (continued)

imize the amount of PWB copper on all leads connected to this device for the lowest operating temperature.

Pin

Symbol

Type

Name/Function

22

B4

I

Bit 4. B0—B5 determine the state of the SLIC. See Operating States.

23

B3

I

Bit 3. B0—B5 determine the state of the SLIC. See Operating States.

24

B2

I

Bit 2. B0—B5 determine the state of the SLIC. See Operating States.

25

B1

I

Bit 1. B0—B5 determine the state of the SLIC. See Operating States.

26

B0

I

Bit 0. B0—B5 determine the state of the SLIC. See Operating States.

27

—

+5 V Digital dc Supply. +5 V supply for logic and switch circuitry.

28

DGND

—

29

—

Battery Supply. Negative high-voltage power supply.

30

BGND

—

31

ITR

I

Tip/Ring Current. A current output which is proportional to the differential current flowing

from tip to ring. Connect a resistor from this pin to VITR.

32

VITR

O

Tip/Ring Voltage Output. The voltage at this output is directly proportional to the differ-

ential tip/ring current. A resistor from this pin to ITR sets the gain.

33

TXI

I

Transmit ac Input. Connect a 0.1 µF capacitor from this pin to VITR.

34

VTX

O

Transmit ac Output Voltage. The ac voltage at this output is 7.2 times the ac voltage at

pin TXI. The dc voltage is equal to the dc voltage on pin VRTX.

35

VRTX

O

Transmit ac Reference Voltage. The dc voltage at this output (2.4 V nominal) is the dc

reference for the transmit signal output VTX.

36

RCVP

I

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

ferential voltage on tip and ring.

37

RCVN

I

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

tial voltage on tip and ring.

38

AGND

—

39

—

+5 V Analog dc Supply. +5 V supply for analog circuitry.

40

LCTH

I

old.

41

I

42

O

dc Output. This output is a voltage that is directly proportional to the differential

tip/ring current.

43

DCR

I

dc Resistance. Ground for dc feed resistance of 180

is connected to DCR.

44

CF2

I/O

Filter Capacitor 2. Connect a 0.1 µF, 100 V capacitor from this pin to AGND and a

0.22 µF, 100 V capacitor from this pin to pin CF1.