THERMAL DATA

Symbol

Description

Value

Unit

Thermal Resistance Junction-ambient

Max

80

°C/W

PIN DESCRIPTION

Pin

Name

Description

Negative Battery Supply Input.

2

RING

RING wire of 2 Wire Line Interface.

3

ZAC

Non Inverting Input of the AC Impedance Synthesis Circuit.

4

VREG

Emitter Connection for the External Transistor.

5

AGND

Analog/Digital Ground.

6

BGND

Battery Ground. This is the Reference for the Battery Voltage (note 1).

7

CAC

AC Current Feedback Input.

8

RPC

External Protection Resistors AC Transmission Compensation.

9

TX

Four Wire Transmitting Amplifier Output.

10

ZB

Non Inverting Operational Input Inserted in the Hybrid Circuit for 2W to 4W

Conversion. The Network Connected from this Pin to Ground shall be a copy

of the Line Impedance.

11

ZA

VRX Output Buffer 2W to 4W Conversion.

12

RX

High Impedance Four Wire Receiving Input.

13

Positive 5V Supply Voltage.

14

REF

Voltage Reference Output; a Resistor Connected to this pin sets the Internal

Bias Current.

15

Negative 5V Supply Voltage.

16

IL

Transversal Line Current Feedback Divided by 50.

17

VPOL

Non Inverting Operational Input to Implement DC Character.

18

BASE

Driver for External Transistor Base.

19

LIM

Voltage Reference Output; a Resistor Connected to this Pin Sets the Value of

Line Current Limitation.

20

RNG

Ringing Logic Input from Line Card Controller.

21

SBY

Stand by Logic Input (SBY = 1 Set Line Current Limitation at 3mA).

22

PU

Power u.p Logic Output for the Codec Filter. (PU = 0 means Codec Filter

Activated)

23

CS

Ring Injector Enable for L3234 Output. (CS = 1 means L3234 Ringing

Injection Enable).

24

OH

Hook Status Logic Output (OH = 0 means off hook).

25

GDK

Ground Key Status Logic Output (GDK = 0 means Ground Key on).

26

RTF

Time Constant Hook Detector Filter Input.

27

GKF

Time Constant GK Detector Filter Input.

28

TIP

Tip Wire of 2 Wire Line Interface.

Note 1:

AGND and BGND pins must be tied together at a low impedance point (e.g. at card connector level).

L3234 - L3235

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