KESRX04
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Symbol
IFFLT1
IFDC1
IFIN
IFDC2
VCC
IFOUT
VCCRF
MIXIP
RFOP
VEERF
RFIN
AGC
PEAK
DATOP
DSN
LF
VEE
VCO2
VCO1
DF2
DF1
DF0
XTAL2
XTAL1
PD
DETB
RSSI
IFFLT2
Function
Noise reducing IF filter
Log amp dc stability capacitor
Log amp input
Log amp dc stability capacitor
Positive supply
IF output to external IF filter
Positive supply for RF circuits
Mixer input
Output from LNA
Negative supply for RF circuits
Input to LNA
RF AGC time constant
Data signal peak detect
Sliced data output
Data slice level
PLL loop filter
Negative supply
Voltage controlled oscillator
Voltage controlled oscillator
Data filter
Data filter
Data filter
Crystal oscillator
Crystal oscillator
Power down
Anti-jam detector input
RSSI output
Noise reducing IF filter
DESCRIPTION
The single-conversion super-heterodyne receiver approach
is now generally considered the way forward for ISM band type
applications because of lower cost, superior selectivity, lower
radiation, and flexibility over other techniques. For power-
conscious, hand-held applications KESRX04 provides im-
proved performance and flexibility on a lower 3.0V supply and
a power-down feature allows faster switch-on times for use in
a pulsed power saving mode.
Although this is a relatively simple receiver, the flexibility of
using an external IF filter allows the designer to choose both
the selectivity and the IF in order to optimise the performance
for a wide range of applications and locations world wide.
The KESRX04, with its Anti-jamming detector circuit, is an
ideal ASK / OOK receiver for difficult reception areas caused
by interference such as “Amateur Radio Repeater Stations”
and Wireless Stereo Head-Phones”. Operation is possible
with interfering signals which are more than 14dB stronger that
the wanted signal (IF bandwidth = 470kHz.), without the cost
penalities of increased IF selectivity and frequency accuracy.
Figure 2 is the system block diagram for the device with an
external ceramic IF filter, SAW fillter and noise reduction filter.
2
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
