U4090B Datasheet, PDF (20/34 Pages) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

U4090B
U 4090 B - Control
0
0 to Z
1 to Z
1
IMPSEL
W Line-impedance = 600
TXA = on
ES = off
W Line-impedance = 600
TXA = off
ES = on
W Line-impedance = 900
TXA = off
ES = on
W Line-impedance = 900
TXA = on
ES = off
MUTR
0
RA2 = on
RECATT = on
STIS + STIL = on
0 to Z RA2 = on
RECATT = off
STIS = on, STIL = off
1 to Z
RA2 = off
RECATT = off
STIS = on, STIL = off
AGA off for STIS
1
RA2 = off
RECATT = on
STIS + STIL = on
MODE
Speech
Transmit-mute
Transmit-mute
Speech
MODE
Speech
For answering
machine
For answering
machine
Speech + ear-
peace mute
MUTX
MODE
0
MIC 1/2 transmit enabled Speech
receive enable
AFS = on
AGA = on
TXACL = on
Z
DTMF transmit enabled
For answering
receive enable
machine
AFS = on
AGA = on
TXACL = on
1
DTMF transmit enabled
DTMF dialling
DTMF to receive enable
AFS = off
AGA = off
TXACL = off
Logic-level
0 = < (0.3 V)
Z = > (1 V) < (VMP – 1 V) or (open input)
1 = > (VMP – 0.3 V)
RECATT = Receive attenuation
STIS, STIL = Inputs of sidetone balancing amplifiers
ES = External supply
AFS = Acoustical feedback supression control
AGA = Automatic gain adjustment
RA2 = Inverting receive amplifier
TXACL = Transmit anticlipping control
20 (34)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96