KESRX04
260 to 470MHz. ASK Receiver with Power Down
Preliminary Information
DS4997 - 1.5 August 1998
The KESRX04 is a single chip ASK (Amplitude Shift Key)
Receiver IC. It is designed to operate in a variety of low power
radio applications including keyless entry, general domestic
and industrial remote control, RF tagging and local paging
systems.
The receiver offers an exceptionally high level of integration
and performance to meet the local oscillator radiation require-
ments of regulatory authorities world-wide. Functionally the
device works in the same way as the KESRX01 with the added
features of low supply voltage, in-band interference rejection
(anti-jamming detector), a 2 stage power down to enable
receiver systems to be implemented with less than 1mA supply,
and a wide IF bandwidth and drive stage to interface to an
external ceramic IF band pass filter at intermediate frequencies
from 0.2MHz to 15MHz.
The KESRX04 is an ideal receiver for difficult reception
areas where high level interferers would jam the wanted signal.
The anti-jamming circuit allows operation to be possible with
interfering signals which are more than 14dB stronger than the
wanted signal, without the cost penalties of increased IF
selectivity and frequency accuracy.
P
IFFLT1
IFDC1
IFFLT2
RSSI
PIN 1
REF. SPOT
IFIN
IFDC2
VCC
IFOUT
VCCRF
MIXIP
RFOP
VEERF
RFIN
AGC
PEAK
DATOP
DETB
PD
XTAL1
XTAL2
DF0
DF1
DF2
VCO1
VCO2
VEE
LF
DSN
(9.80/10.01)
QP28
Figure 1 Pin Connections (top view)
FEATURES
s
In-band interference rejection (typ. 14dB)
s
-103dBm Sensitivity (IF BW = 470kHz)
s
AGC around LNA and Mixer
s
Low supply voltage (3 to 6V)
s
2 stage power-down for low current applications
s
Interface for ceramic IF filters up to 15MHz
APPLICATIONS
s
Remote Keyless Entry
s
Security, tagging
s
Remote Controlled equipment
ORDERING INFORMATION
KESRX04/IG/QP1S (anti-static tubes)
KESRX04/IG/QP1T (tape and reel)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Vcc
Storage temperature,Tstg
Junction Temperature, Tj
RF Input power
-0.5V to +7V
-55 to 150°C
-55 to 150°C
+20dBm from 50Ω
agc
RF Input
mixer
Ceramic
IF Filter
RSSI detector
Anti-jam data filter
Slicer
SAW
Filter
LNA
Noise
reduction
Filter
Local
Oscillator
Sliced
data
Ref
Figure 2 Typical system application
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
