ICS1660
Integrated
Circuit
Systems, Inc.
Incoming Call Line Identification (ICLID) Receiver
with Ring Detection
Description
Features
The ICS1660 “ICLID” circuit is a monolithic CMOS VLSI
device that decodes and detects the Frequency Shift Keying
(FSK) signals used in caller identification telephone service.
The ICS1660, when used in conjunction with some external
components, amplifies, filters and demodulates the FSK
data transmitted from the central office to the telephone
subscriber.
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Ring Detection
Low Battery Detection
Internal 5V Regulator - can externally source 25mA
FSK Demodulation
Power-down in Standby Mode
Direct Interface to Host Microprocessor or
Microcomputer
The ICS1660 detects the first power ring signal and demodu-
lates the 1200 baud FSK data transmitted during the silent
interval between the first and second power ring. TheFSK data
is transmitted from the central office switch to the subscriber
line as part of the CLASS service of Calling Number Delivery
(CND). This data is then demodulated, amplified and filtered
by the ICS1660 and digitally transmitted to the host control-
ler/processor.
Applications
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Telephones
Facsimile Machines
Modems
The ICS1660 is designed to be powered by any off-the-shelf
9.0 volt battery. The on-chip 5.0 voltage regulator powers the
host microprocessor and any external circuitry supported by
the ICS1660. This portion of the circuit can be overridden by
connecting the VIN pin (18) to the VDD pin (1) for a common
power supply. A low battery detection circuit is also provided
on-chip and signals the microprocessor on the FSK/BAT pin
(17) when the PWR pin (16) input is pulled low.
Telephone Interface Equipment
Stand-alone ICLID products
ICLID Block Diagram
TO LINE
Surge and
Lightning
Protection
2 x 16 LCD
Display
TO PHONE
3
8
Control
Data
ICS1660
KEYPAD
Micro-
Rng Detect
Controller
FSK Demodulation
Signal Conditioning
Low Battery Detect
External
Power-down
Standby
Memory
(RAM/EPROM)
+5VDC
DC
Jack
AC/DC
Adapter
Voltage
Regulation
9VDC
ICS1660RevA100694
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
