U4089B-P_05 Datasheet, PDF (14/26 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit

Table 8-1. U4089B-P Control
MUTX
MIC1, MIC2 transmit enabled receive enable
0
AFS = on
AGA = on
TXACL = on
DTMF transmit enabled receive enable
Z
AFS = on
AGA = on
TXACL = on
DTMF transmit enabled DTMF to receive enable
1
AFS = off
AGA = off
TXACL = off
0
0 to Z
1 to Z
1
IMPSEL
Line impedance = 600Ω
TXA = on
ES = off
Line impedance = 600Ω
TXA = off
ES = on
Line impedance = 900Ω
TXA = off
ES = on
Line impedance = 900Ω
TXA = on
ES = off
Logic level
0 = < (0.3V)
Z = > (1V) < (V_MP – 1V) or (open input)
1 = > (V_MP – 0.3V)
AFS = Acoustical feedback-suppression control
AGA = Automatic gain adjustment
TXACL = Transmit anti-clipping control
ES = External supply
MODE
Speech
For answering machine
DTMF dialling
MODE
Speech
Transmit mute
Transmit mute
Speech
14 U4089B-P
4518C–CORD–10/05