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

CPC5620/CPC5621
1.3 Pin Description
Figure 2. Pinout
Pin Name Function
1
VDD
2
TXSM
REFL
32
TXF
31
1 VDD
Host (CPE) side power supply
3
TX-
ZTX
30
2 TXSM Transmit summing junction
4
TX+
5
TX
ZNT
29
TXSL
28
3 TX-
Negative differential transmit signal to DAA
from host
6
MODE
7
GND
BR-
27
NTS
26
4 TX+
Positive differential transmit signal to DAA from
host
8
OH
9
RING
10
CID
GAT
25
NTF
24
DCS1
23
5 TX
6 MODE
7 GND
8 OH
9 RING
10 CID
Transmit differential amplifier output
When asserted low, changes gain of TX path
(-7 dB) and RX path (+7 dB) to accommodate
reactive termination networks
Host (CPE) side analog ground
Assert logic low for off-hook operation
Indicates ring signal, pulsed high to low
Assert logic low while on hook to place CID
information on RX pins.
Negative differential analog signal received
11
RX-
12
RX+
13
SNP+
14
SNP-
y ¹⁵
RXF
inar ¹⁶
RX
DCS2
ZDC
BR-
RPB
RXS
VDDL
22
21
20
19
18
17
11 RX-
12 RX+
13 SNP+
14 SNP-
15 RXF
16 RX
17 VDDL
from the telephone line. Must be AC coupled
with 0.1 µF.
Positive differential analog signal received from
lim ^{the telephone line. Must be AC coupled with}
0.1 µF.
Positive differential snoop input
Negative differential snoop input
e ^{Receive photodiode amplifier output}
Receive photodiode summing junction
r _{Power supply for line side, regulated from tip}
P ^{and ring.}
18 RXS
Receive isolation amp summing junction
19 RPB
Receive LED pre-bias current set
20 BR-
Bridge rectifier return
21 ZDC
Electronic inductor DCR/current limit
22 DCS2 DC feedback output
23 DCS1 V to I slope control
24 NTF
Network amplifier feedback
25 GAT
External MOSFET gate control
26 NTS
Receive signal input
27 BR-
Bridge rectifier return
28 TXSL
Transmit photodiode summing junction
29 ZNT
Receiver impedance set
30 ZTX
Transmit transconductance gain set
31 TXF
Transmit photodiode amplifier output
32 REFL
1.25 Vdc reference
Rev. 0.E
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