Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
2005 Cermetek Microelectronics, Inc.
Page 14
Document No. 607-0017-01 Revision A (05/05)
Table 6. CH2165 iModem Electrical Specifications.
Parameter Minimum
Typical
Maximum
Units Comments
Off Hook Impedance
20
Mohm
Trans Hybrid Loss
25
dB
600 Ohm, RXA, TXA
Ring Voltage Loop
15
V
PP
On 48VDC line voltage
for sustained periods
Line Loop Current - (Off
Hook)
20 60
mA
Return Loss @ 1000 Hz
15
dB
600 Ohm
Ring Frequencies
18
20
30
Hz
Receiver Insertion Gain
-0.5
0.0
+0.5
dB
Transmit Power
-9.5
dBm
600 Ohm- Data Mode
First Character After Reset
See Note 1
25.0 sec
Delay
Inter Character Delay
20
50
msec
Between all command
characters
Command Delay
100
200
msec
Between all AT
commands
Minimum Reset Pulse
1
µsec
If user supplied
Note: 1. All CH2165 iModem devices re-load operating firmware upon reset and then perform an internal
self-check. The CH2165 will not respond to commands issued during this sequence.
Figure 8.
Physical Dimensions and Pin Functions for CH21XX Product Family.
