ch1817lm ETC-unknow, ch1817lm Datasheet - Page 3

• Manufacturer Part Number: ch1817lm
• Description: Family Of Low Profile Daa Modules
• Manufacturer: ETC-unknow

¤2002 Cermetek Microelectronics, Inc.
Cermetek Microelectronics, Inc.
Pin
1
2
3
4
5
6
7
8
9
XMIT(+)
OFFHK
XMIT(-)
Name
RING
GND
RCV
VCC
N/C
TIP
RI
or
I/O
I/O
I/O
or
O
O
I
I
-
I
I
I
TIP. Direct telephone line connection.
RING. Direct telephone line connection.
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.
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.
RECEIVE. This provides the signal or audio output with respect to ground and must
be AC coupled with a 0.1PF capacitor to eliminate DC offset.
TRANSMIT SIGNAL (-). Input a differential AC coupled audio signal with respect to
XMIT(+), CH1817-D versions only. All others, No Connection. For single ended
operation of CH1817-D, connect this pin to ground through a 0.1PF capacitor.
POWER SUPPLY. +5V ± 5%
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.
Ground. Must be connected to signal ground. Note: Noise should be less than
25mV peak-to-peak.
Table 1.
CH1817 Family Pin Description.
Page 3
Function
CH1817 Family of Low Profile DAA Modules
Document No. 607-0007 Revision B (01/02)