CPC5621 datasheet(5/18 Pages) CLARE

5 / 18 page

CPC5620/CPC5621

Rev. 0.E

www.clare.com

1.3 Pin Description

Figure 2. Pinout

Name

Function

VDD

Host (CPE) side power supply

TXSM

Transmit summing junction

3TX-

Negative differential transmit signal to DAA

from host

4TX+

Positive differential transmit signal to DAA from

host

Transmit differential amplifier output

6MODE

When asserted low, changes gain of TX path

(-7 dB) and RX path (+7 dB) to accommodate

reactive termination networks

GND

Host (CPE) side analog ground

8OH

Assert logic low for off-hook operation

9RING

Indicates ring signal, pulsed high to low

10 CID

Assert logic low while on hook to place CID

information on RX pins.

11 RX-

Negative differential analog signal received

from the telephone line. Must be AC coupled

with 0.1

µF.

12 RX+

Positive differential analog signal received from

the telephone line. Must be AC coupled with

0.1

µF.

13 SNP+

Positive differential snoop input

14 SNP-

Negative differential snoop input

15 RXF

Receive photodiode amplifier output

16 RX

Receive photodiode summing junction

17 VDDL

Power supply for line side, regulated from tip

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

VDD

TXSM

TX-

TX+

MODE

GND

RING

CID

RX-

RX+

SNP+

SNP-

RXF

REFL

TXF

ZTX

ZNT

TXSL

BR-

NTS

GAT

NTF

DCS1

DCS2

ZDC

BR-

RPB

RXS

VDDL

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