U209B
| Model | U209B |
| Description | Monolithic Integrated Feature Phone Circuit |
| PDF file | Total 34 pages (File size: 675K) |
| Chip Manufacturer | ATMEL |
U4090B
U 4090 B - Control
0
IMPSEL
Line-impedance = 600
W
TXA = on
ES = off
Line-impedance = 600
W
TXA = off
ES = on
Line-impedance = 900
W
TXA = off
ES = on
Line-impedance = 900
W
TXA = on
ES = off
MODE
Speech
0
MUTX
MIC 1/2 transmit enabled
receive enable
AFS = on
AGA = on
TXACL = on
DTMF transmit enabled
receive enable
AFS = on
AGA = on
TXACL = on
DTMF transmit enabled
DTMF to receive enable
AFS = off
AGA = off
TXACL = off
MODE
Speech
0 to Z
Transmit-mute
Z
Transmit-mute
1 to Z
For answering
machine
1
Speech
1
DTMF dialling
0
0 to Z
1 to Z
MUTR
RA2 = on
RECATT = on
STIS + STIL = on
RA2 = on
RECATT = off
STIS = on, STIL = off
RA2 = off
RECATT = off
STIS = on, STIL = off
AGA off for STIS
RA2 = off
RECATT = on
STIS + STIL = on
MODE
Speech
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
For answering
machine
For answering
machine
1
Speech + ear-
peace mute
20 (34)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
