U4090B Datasheet, PDF(6/34 Page) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

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U4090B Datasheet, PDF (6/34 Pages) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

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U4090B

GT 1

44 TXIN

DTMF 2

43 RECIN

MICO 3

MIC2 4

42 TTXA

41 GR

MIC1 5

40 RECO1

PD 6

39 RAC

IND 7

38 STIL

VL 8

37 STIS

GND 9

36 RECO2

SENSE 10

VB 11

U4090B

SAO 12

35 MUTR

34 VM

33 STO

VMPS 13

32 IREF

VMP 14

31 AGA

SWOUT 15

30 TLDR

COSC 16

29 TLDT

VRING 17

28 INLDR

THA 18

27 INLDT

RFDO 19

LIDET 20

26 ATAFS

25 MUTX

IMPSEL 21

24 SAI

TSACL 22

23 GSA

94 7905 e

Pin Description

Pin Symbol

Function

GT A resistor from this pin to GND sets the

amplification of microphone and DTMF

signals, the input amplifier can be muted

by applying VMP to GT.

2 DTMF Input for DTMF signals,

also used for the answering machine

and handsfree input

3 MICO Output of microphone preamplifier

4 MIC 2 Non-inverting input of microphone

amplifier

5 MIC 1 Inverting input of microphone

amplifier

6 PD Active high input for reducing the

current consumption of the circuit,

simultaneously VL is shorted by an

internal switch

7 IND The internal equivalent inductance of

the circuit is proportional to the value

of the capacitor at this pin,

a resistor connected to ground may be

used to reduce the dc line voltage

8 VL Line voltage

9 GND Reference point for dc- and ac-output

signals

10 SENSE A small resistor (fixed) connected

from this pin to VL sets the slope of

the dc characteristic and also effects

the line length equalization

characteristics and the line current at

which the loudspeaker amplifier is

switched on

11 VB Unregulated supply voltage for

peripheral circuits (voice switch),

limited to typically 7 V

12 SAO Output of loudspeaker amplifier

13 VMPS Unregulated supply voltage for ÂµP,

limited to 6.3 V

14 VMP Regulated supply voltage 3.3 V for

peripheral circuits (especially

microprocessors),

minimum output current: 2 mA

(ringing)

4 mA (speech mode)

15 SWOUT Output for driving external switching

transistor

16 COSC 40 kHz oscillator for ringing power

converter

6 (34)

TELEFUNKEN Semiconductors

Preliminary Information

Rev. C1, 28-Oct-96

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