ISDN TA POTS Interface
CMX625
1.4
External Components
V
DD
FSC
V
DD
R6
R7
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
SPM
RING
DAC OUT
TXON
TXN
TXO
TONEFSK
V
BIAS
RXO
RXN
RXP
V
BIAS
R2
C1
R3
C4
C3
Rx In
V
SS
C5
R4
R5
C6
Tx In
V
SS
C2
DCL
DD
DU
TE/NTE
SA0
SA1
SA2
DS
IOM
TM
-2
Bus
Interface
CMX625
V
DD
R1
RESET
IRQN
V
SS
V
SS
Figure 2 Recommended External Components
R1, R4
R2, R3
R5
R6, R7
100kΩ
110kΩ
56kΩ
Note 2
C1, C2
C3
C4, C5
C6
1.0µF
100nF
220pF
22nF
Resistor ±1%, capacitors ±5% unless otherwise stated.
Note:
1. The recommended component values, C3 to C6 and R2 to R5 and tolerances are essential to
meet the ITU-T Recommendation G.172 filter specification. See figure 12.
2. R6, R7 = 750Ω with 5V supply. R6, R7 = 470Ω with 3.3V supply.
2001 Consumer Microcircuits Limited
6
D/625/2
CMLMICRO [ CML MICROCIRCUITS ]
