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STLC3075

Table 3. Operating Range

(1) Vbat is self generated by the on chip DC/DC converter and can be programmed via RF1 and RF2.

RF1 and RF2 shall be selected in order to fulfil the a.m limits (see External Components Table page 10)

Table 4. Thermal Data

Symbol

Parameter

Value

Unit

Positive Supply Voltage

4.5 to +12

V

A/BGND

AGND to BGND

-100 to +100

mV

Pin D0, D1, D2, DET, CKTTX, PD

-0.25 to 5.25

V

Ambient Operating Temperature Range

-40 to +85

°C

(1)

Self Generated Battery Voltage

-74 max.

V

Symbol

Parameter

Value

Unit

Thermal Resistance Junction to Ambient

Typ.

60

°C/W

Table 5. Pin Description

N°

Pin

Function

1

D0

Control Interface: input bit 0.

2

D1

Control Interface: input bit 1.

3

D2

Control interface: input bit 2.

4

PD

Power Down input. Normally connected to CVCC (or to logic level high).

5Gain

SET

6,22,38,

39,40,42

NC

Not connected.

7DET

Logic interface output of the supervision detector (active low).

8

CKTTX

Metering pulse clock input (12 KHz or 16KHz square wave).

9

CTTX1

Metering burst shaping external capacitor.

10

CTTX2

Metering burst shaping external capacitor.

11

RTTX

Metering pulse cancellation buffer output. TTX filter network should be connected to this point.

If not used should be left open.

12

FTTX

Metering pulse buffer input this signal is sent to the line and used to perform TTX filtering.

13

RX

4 wire input port (RX input); 300K

Ω input impedance. This signal is referred to AGND.

If connected to single supply CODEC output it must be DC decoupled with proper capacitor.

14

ZAC1

RX buffer output (the AC impedance is connected from this node to ZAC).

15

ZAC

AC impedance synthesis.

16

RS

Protection resistors image (the image resistor is connected from this node to ZAC).

17

ZB

Balance Network for 2 to 4 wire conversion (the balance impedance ZB is connected from this

node to AGND. ZA impedance is connected from this node to ZAC1).

18

CAC

AC feedback input, AC/DC split capacitor (CAC).

19

TX

4 wire output port (TX output). The signal is referred to AGND. If connected to single supply

CODEC input it must be DC decoupled with proper capacitor.

20

CZ

Fly-Back compensation

21

VF

Feedback input for DC/DC converter controller.