CMX625P4 CMLMICRO [CML Microcircuits], CMX625P4 Datasheet - Page 5

• Manufacturer Part Number: CMX625P4
• Description: ISDN TA POTS Interface
• Manufacturer: CMLMICRO [CML Microcircuits]

ISDN TA POTS Interface
2001 Consumer Microcircuits Limited
CMX625
Pin No.
D5/P4
Notes:
This device is capable of detecting and decoding small amplitude signals. To achieve this V
and V
important. It is recommended that the printed circuit board is laid out with a ground plane in the
CMX625 area to provide a low impedance connection between the V
decoupling capacitors.
12
13
14
15
16
17
18
19
20
21
22
23
24
BIAS
TONEFSK
DAC OUT
decoupling and protecting the receive path from extraneous in-band signals are very
I/P
O/P =
BI
N/C =
TXON
Name
V
RING
RXO
SPM
RXP
RXN
TXO
TXN
V
V
BIAS
DD
SS
=
=
Signal
No (external) Connection
Input
Output
Bi-directional
Power
Power
Type
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
I/P
I/P
I/P
The negative supply rail (ground).
The non-inverting input of the receive op-amp.
The inverting input of the receive op-amp.
The output of the receive op-amp.
An internally generated bias voltage of V
when the device has been reset, V
V
mounted close to the device pins.
The sinewave output of the Tones and FSK signal
generators.
The output of the buffer amplifier.
The inverting input to the buffer amplifier.
The inverted output of the buffer amplifier.
The output from the digital-to-analogue converter.
The square, trapezoidal and sinusoidal wave output from
the Ringing Signal Generator.
The sinewave output of the SPM signal generator.
The positive supply rail. Levels and thresholds within the
device are proportional to this voltage. It should be
decoupled to V
device pins.
SS.
It should be decoupled to V
5
SS
by a capacitor mounted close to the
Description
SS
BIAS
pin and the V
SS
will discharge to
by a capacitor
DD
/2, except
DD
and V
CMX625
D/625/2
BIAS
DD