CPC5620 Datasheet, PDF (5/18 Pages) Clare, Inc. – LITELINK III Phone Line Interface IC (DAA)

INTEGRATED CIRCUITS DIVISION
1.3 Pin Description
Pin Name
1 VDD
2 TXSM
3 TX-
4 TX+
5 TX
6 MODE
7 GND
8 OH
9 RING
10 CID
11 RX-
12 RX+
13 SNP+
14 SNP-
15 RXF
16 RX
17 VDDL
18 RXS
19 RPB
20 BR-
21 ZDC
22 DCS2
23 DCS1
24 NTF
25 GAT
26 NTS
27 BR-
28 TXSL
29 ZNT
30 ZTX
31 TXF
32 REFL
Function
Low-voltage (CPE) side power supply
Transmit summing junction
Negative differential transmit signal to DAA
from low-voltage side
Positive differential transmit signal to DAA from
low-voltage side
Transmit differential amplifier output
When asserted low, changes gain of TX path
(-7 dB) and RX path (+7 dB) to accommodate
reactive termination networks
Low-voltage (CPE) side analog ground
Assert logic low for off-hook operation
Ringing Detect Output
Assert logic low while on hook to allow CID
information to be passed to the RX+ and RX-
output pins.
Negative differential analog signal received
from the telephone line. Must be AC coupled
with 0.1 F.
Positive differential analog signal received from
the telephone line. Must be AC coupled with
0.1 F.
Positive differential snoop input
Negative differential snoop input
Receive photodiode amplifier output
Receive photodiode summing junction
Power supply for line side, regulated from tip
and ring.
Receive isolation amp summing junction
Receive LED pre-bias current set
Bridge rectifier return
Electronic inductor DCR/current limit
DC feedback output
V to I slope control
Network amplifier feedback
External MOSFET gate control
Receive signal input
Bridge rectifier return
Transmit photodiode summing junction
Receiver impedance set
Transmit transconductance gain set
Transmit photodiode amplifier output
1.25 V_DC reference
Figure 1. Pinout
1
V_DD
2
TXSM
3
TX-
4
TX+
5
TX
6
MODE
7
GND
8
OH
9
RING
10
CID
11
RX-
12
RX+
13
SNP+
14
SNP-
15
RXF
16
RX
R05
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CPC5620/CPC5621
REFL
32
TXF
31
ZTX
30
ZNT
29
TXSL
28
BR-
27
NTS
26
GAT
25
NTF
24
DCS1
23
DCS2
22
ZDC
21
BR-
20
RPB
19
RXS
18
V_DDL
17
5