CPC5622 Clare, CPC5622 Datasheet - Page 13

• Manufacturer Part Number: CPC5622
• Description: LITELINK III, Full-wave Ring Detect
• Manufacturer: Clare

Figure 6. Differential and Single-ended Transmit
3.4 Initialization Requirement
Following Power-up
OH must be de-asserted (set logic high) once after
power-up for at least 50ms to transfer internal gain
trim values within LITELINK. This would be normal
operation in most applications. Failure to comply with
this requirement will result in transmission gain errors
and possibly distortion.
3.5 DC Characteristics
The CPC5622 is designed for worldwide applications.
Modification of the values of the components at the
ZDC, DCS1, and DCS2 pins allow for control of the VI
slope characteristics of LITELINK. Selecting
appropriate resistor values for R
R
enable compliance with various DC requirements.
3.5.1 Setting a Current Limit
LITELINK includes a telephone line current limit
feature that is selectable by choosing the desired
value for R
Clare recommends using 8.2 Ω for R
applications, limiting telephone line current to 130 mA.
Whether using the recommended value above or
when setting R
Rev. 1.0
Host CODEC or
Transmit Circuit
Host CODEC or
Transmit Circuit
DCS2
TXA1
TXA2
TXA1
(R15) in the provided application circuits
Path Connections to LITELINK
ZDC
I
CL
ZDC
(R16) using the following formula:
Amps
N/C
higher for a lower loop current limit
0.1uf
0.1uf
0.1uf
=
------------ -
R
1V
ZDC
LITELINK
LITELINK
TX+
TX-
TX+
TX-
+
0.008A
ZDC
(R16) and
ZDC
-
+
+
-
for most
www.clare.com
refer to the guidelines for FET thermal management
provided in AN-146,
LITELINK
3.6 AC Characteristics
3.6.1 Resistive Termination Applications
North American and Japanese telephone line AC
termination requirements are met with a resistive
600Ω ac 2-wire termination. For these applications
LITELINK’s 2-wire network termination impedance is
set by the resistor R
(pin 29) with a value of 301Ω.
3.6.2 Reactive Termination Applications
Many countries use a single-pole complex impedance
to model the telephone network transmission line
characteristic impedance as shown in the table below.
Proper gain and termination impedance circuits for a
complex impedance requires the use of complex
network on ZNT as shown in the
Application Circuit” on page
3.6.3 Mode Pin Usage
Assert the MODE pin low (MODE = 0) introduces a
7 dB pad into the transmit path and adds 7 dB of gain
to the receive path. These changes compensate for
the gain changes made to the transmit and receive
paths necessary for reactive termination
implementations. Overall insertion loss with the
reactive termination application circuit and MODE
asserted is 0 dB.
Overall insertion loss with MODE de-asserted
(MODE = 1) for the resistive termination application
circuit is 0 dB.
R
P
R
S
C
P
Designs.
Line Impedance Model
R
R
C
S
P
P
ZNT
Australia
Guidelines for Effective
120 nF
220 Ω
820 Ω
(R10) located at the ZNT pin
8.
100 nF
“Reactive Termination
China
200 Ω
680 Ω
CPC5622
TBR 21
150 nF
270 Ω
750 Ω
13