U4092B Datasheet, PDF (6/32 Pages) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

U4092
GT ₁
40 _TXIN
DTMF 2
39 _RECIN
MICO 3
MIC2 4
38 _TTXA
37 ^GR
MIC1 5
36 ^RAC
PD 6
35 STI
IND 7
VL ₈
GND ₉
SENSE ₁₀
U4092B
34 RECO
33 VM
32 STO
31 IREF
VB ₁₁
30 ^AGA
SAO 12
29 ^TLDR
VMPS ₁₃
VMP ₁₄
28 TLDT
27 INLDR
SWOUT ₁₅
26 INLDT
COSC ₁₆
25 ATAFS
VRING ₁₇
24 MUTX
THA ₁₈
23 SAI
RFDO ₁₉
22 GSA
IMPSEL 20
21 _TSACL
94 8900
TELEFUNKEN Semiconductors
Pin description
Pin Symbol
Function
1
G_T 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 G_T.
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 V_L 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
V_L Line voltage
9 GND Reference point for dc- and
ac-output signals.
10 SENSE A small resistor (fixed) connected
from this pin to V_L sets the slope of
the dc characteristic and also effects
the line length equalization charac-
teristics and the line current at
which the loudspeaker amplifier is
switched on.
11 V_B Unregulated supply voltage for
peripheral circuits (voice switch);
limited to typically 7 V.
12 SAO Output of loudspeaker amplifier.
13 V_MPS Unregulated supply voltage for µP,
limited to 6.3 V.
14 V_MP Regulated supply voltage 3.3 V for
peripheral circuits (especially
microprocessors). The maximum
output current is 2 mA.
15 SWOUT Output for driving external
switching transistor
16 COSC 40 kHz oscillator for ringing power
converter
6
Preliminary Information
Rev. A1: 24.01.1995