U4089B-P Datasheet, PDF (14/26 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit

U4089B-P Control
MUTX
MODE
0
MIC 1/2 transmit enabled receive enable
AFS = on
AGA = on
TXACL = on
Speech
Z
DTMF transmit enabled receive enable
AFS = on
AGA = on
TXACL = on
For answering machine
1
DTMF transmit enabled DTMF to receive enable
DTMF dialling
AFS = off
AGA = off
TXACL = off
0
0 to Z
1 to Z
1
IMPSEL
Line impedance = 600 Ω
TXA = on
ES = off
Line impedance = 600 Ω
TXA = off
ES = on
Line impedance = 900 Ω
TXA = off
ES = on
Line impedance = 900 Ω
TXA = on
ES = off
MODE
Speech
Transmit mute
Transmit mute
Speech
Logic-level
0 = < (0.3 V)
Z = > (1 V) < (V_MP - 1 V) or (open input)
1 = > (V_MP - 0.3 V)
AFS = Acoustical feedback-suppression control
AGA = Automatic gain adjustment
TXACL = Transmit anti-clipping control
ES = External supply
14 U4089B-P
4518A–CORD–05/02