CPC5604A Clare, CPC5604A Datasheet - Page 17

• Manufacturer Part Number: CPC5604A
• Description: IC DAA OPT SGL 56K PCMCIA 32-SOP
• Manufacturer: Clare
• Series: LITELINK®r

Specifications of CPC5604A

• Function: Data Access Arrangement (DAA)
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 15mA
• Power (watts): 1W
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-SOIC (7.5mm Width)
• Includes: Caller ID Signal Detector, Ring Detector
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Temp Range: -20C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Compliant

Ring Signal Detection
The snoop circuit actively monitors the telephone line
for 2 conditions:
1. Incoming ring signal
2. Caller ID information
The Snoop circuit “snoops” the line continuously while
the LiteLink
from the telephone line in the on-hook condition by the
LITELINK
meeting regulatory requirements for minimum on-hook
impedance limitation. When the central office places
the ring signal on the telephone line, that signal is cou-
pled through a pair of RC circuits to a differential ampli-
fier in the LiteLink
Referring to Block Diagram, snoop capacitors connect-
ed to the SNP1/SNP2 pins provide a high voltage isola-
tion barrier between the host and the telephone line
while coupling the AC signals to the snoop amplifier.
The ring signal is digitized and brought out to the RING
pin where the host can qualify it as a valid ring signal.
The ring detection threshold is dependent on the values
of 3 external components: RRXF (R3), RSNOOP (R5 or
R6), and CS (C6 or C7). The default values in the typi-
cal bill of materials reflects the parameters in the data
sheet for typical operation. If it is desired to change the
threshold, the values can be selected by using the
equation:
V
Where f = ring frequency typically 20Hz.
XXX
Figure 2D Connection To Host Single Ended
(Transmit)
HOST DATA PUMP/CODEC
RING(PEAK)
TXA2
TXA1
SINGLE ENDED CONNECTION TO CPC5604A
TM
TM
= 330E-3
is maintained at a low 2uA maximum thus
is in the on-hook mode. Current taken
5R
TM
RXF
.
0.1uf
0.1uf
CPC5604A LITELINK
TX+
TX-
(R
SNOOP)
-
+
2
+
(2πf C
TM
1
S
)
2
www.clare.com
Full details about the CID signal can be found in Bellcore
document TR-TSY-000030, issue 1/1988.
Figure 2.7.A shows the CID timing diagram. Waveform
#1 represents the Analog signals on the telephone line
(amplitude not drawn to scale), waveform #2 is the dig-
ital RING detect output from the LiteLink
#3 is the CID input to the LiteLink
the first ring burst is detected by the host, the host
enables the CID line which automatically couples the
snoop circuit to the RX outputs on the LiteLink
Care should be taken when using this equation since
RRXF (R3), CS (C6 or C7), and RSNOOP (R5 or R6)
affect receive gain and Caller ID gain. It is recom-
mended that RRXF (R3) be set to the typical value and
then after adjusting the ring detect threshold, check that
CID gain is acceptable.
Caller ID Detection
Caller ID (CID) is a service offered by the telephone
company to provide caller information (i.e. caller’s tele-
phone number) to the called party. CID service is
optional and signals only appear on the telephone lines
of subscribers that pay for this feature. The CID infor-
mation appears on the telephone line after the first ring
burst is sent from the central office (CO).
Some of the characteristics of the CID signal are sum-
marized below:
Parameter
Signal Level
Link Type
Transmission Scheme
Logical 1 (mark)
Logical 0 (Space)
Transmission Rate
Data
BER
Bit Duration
Value
-13dBm
Simplex, 2W
Phase-coherent, FSK
1200±12Hz
2200± 22Hz
1200bps
serial binary async
< 10E -5
833±50uS (same for start/stop as
well)
TM
from the Host. After
TM
CPC5604
, waveform
TM
.
17