u4089b-m ATMEL Corporation, u4089b-m Datasheet - Page 5

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u4089b-m

Manufacturer Part Number
u4089b-m
Description
Multi-standard Feature Phone Circuit With Voice Switch
Manufacturer
ATMEL Corporation
Datasheet

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Rev. A3, 06-Mar-01
10 (11)
11 (13)
12 (20) IMPSEL Control input for selection of line
13 (21)
14 (22)
1 (44)
9 (10)
2 (1)
3 (3)
4 (4)
5 (6)
6 (7)
7 (8)
8 (9)
Pin
Symbol
TSACL
SENSE
DTMF
MIC 2
MIC 1
GND
SAO
GSA
V
IND
G
V
V
MP
T
L
B
A resistor from this pin to GND sets the
amplification of microphone and DTMF
signals; the input amplifier can be
muted by applying V
Input for DTMF signals. Also used for
the answering machine and hands-free
input.
Non-inverting input of microphone
amplifier
Inverting input of microphone amplifier
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.
Line voltage
Reference point for DC- and AC-output
signals
A small resistor (fixed) connected from
this pin to V
characteristic and also affects the
line-lengthequalization characteristics
and the line current at which the
loudspeaker amplifier is switched on.
Unregulated supply voltage for
peripheral circuits (voice switch);
limited to typically 7 V.
Output of loudspeaker amplifier
Regulated supply voltage 3.3 V for
peripheral circuits. The maximum
output current is 2 mA.
impedance
1. 600 W
2. 900 W
3. Mute of second transmit stage (TXA);
also used for indication of external
supply (answering machine); last chosen
impedance is stored
Time constant of anti-clipping of
speaker amplifier
Current input for setting the gain of the
speaker amplifier. Adjustment charac-
teristic is logarithmical. For RGSA
> 2 M
switched off.
the speaker amplifier is
L
sets the slope of the DC
Function
MP
to G
T
.
15 (23)
16 (24)
17 (25)
18 (26)
19 (27)
20 (28)
21 (29)
22 (30)
23 (31)
24 (32)
25 (33)
26 (36)
27 (39)
28 (40)
29 (41)
30 (42)
Pin
Symbol
INLDR
MUTX
ATAFS
INLDT
RECIN
RECO
TTXA
TLDT
TLDR
AGA
IREF
STO
SA I
STI
V
G
M
R
Speaker amplifier input (for loud-
speaker, tone ringer and hands-free use)
Three-state input of transmit mute:
1) Speech condition; inputs MIC1 /
2) DTMF condition; input DTMF
3) Input DTMF used for answering
Attenuation of acoustical feedback
suppression. Maximum attenuation of
AFS circuit is set by a resistor at this
pin. Without the resistor, AFS is
switched off.
Input of transmit level detector
Input of receive level detector
Time constant of transmit level
detector
Time constant of receive level
detector
Automatic gain adjustment with line
current. A resistor connected from this
pin to GND sets the starting point. Max.
gain change is 6 dB.
Internal reference current generation;
RREF = 62 k ; IREF = 20 A
Side-tone reduction output. Output
resistance is approximately 300 .
Maximum load impedance is 10 k
Reference node for microphone-
earphone and loudspeaker amplifier.
Supply for electret microphone
(IM
Input for side-tone network
Output of receiving amplifier
A resistor connected from this pin to
GND sets the receiving ampli- fication
of the circuit; amplifier RA1 can be
muted by applying V
Time constant of anti-clipping in
transmit path
Input of receiving path; input
impedance is typically 80 kW
MIC2 active
active. A part of the input signal is
passed to the receiving amplifier as
a confidence signal during dialing.
machine and hands-free use; receive
branch is not affected.
U4089B-M
mA).
Function
MP
to G
R
5 (23)

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