CH1817-D 查看數據表（PDF） - Unspecified

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CH1817-D

Family of Low Profile DAA Modules

Unspecified 

Cermetek Microelectronics, Inc.

CH1817 Family of Low Profile DAA Modules

Pin Name

1

TIP

Table 1. CH1817 Family Pin Description.

I/O

Function

I/O TIP. Direct telephone line connection.

2

RING

I/O RING. Direct telephone line connection.

3 OFFHK

4

RI

5

RCV

6 XMIT(-)

or

N/C

7

VCC

I

OFF HOOK. When set LOW, the CH1817 is placed On-Hook. When set HIGH, the

CH1817 is placed Off-Hook to answer or place a call. This input can also be used

for pulse dialing. NOTE: When answering incoming calls in response to a ring

indication on RI, internal relay contact degradation may occur if OFFHK is set HIGH

before RI returns to its HIGH state.

O RING INDICATION. It is asserted LOW by the CH1817 during the 2 second ON

portion of the incoming AC Ring Signal and is asserted HIGH during the 4 second

idle period between rings. An envelope of the AC ring signal may be created using

the application circuit shown in Figure 2.

O RECEIVE. This provides the signal or audio output with respect to ground and must

be AC coupled with a 0.1µF capacitor to eliminate DC offset.

I

TRANSMIT SIGNAL (-). Input a differential AC coupled audio signal with respect to

or XMIT(+), CH1817-D versions only. All others, No Connection. For single ended

-

operation of CH1817-D, connect this pin to ground through a 0.1µF capacitor.

I

POWER SUPPLY. +5V ± 5%

8 XMIT(+)

9

GND

I

TRANSMIT SIGNAL (+). Input an AC coupled audio signal with respect to ground.

Input a differential signal with respect to XMIT(-) for the CH1817-D versions only.

I

Ground. Must be connected to signal ground. Note: Noise should be less than

25mV peak-to-peak.

2002 Cermetek Microelectronics, Inc.

Page 3

Document No. 607-0007 Revision B (01/02)

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