KESRX05
Name
DF0
Function
Anti-jam detector circuit output
DF0
7µA
Pin
22
Schematic
23
XTAL2
Crystal oscillator input
This pin is directly connected to the base of the
Colpitts oscillator input transistor. The value of the
feedback capacitors C13, C14 connected between
XTAL1 and XTAL2 are set by the parallel load
capacitance of the external crystal. Connecting a
200kΩ resistor from XTAL 1 to ground (in parallel
with C14 ) will maintain oscillation of the crystal in
PD0 mode but increase the receiver current
consumption by approx 20µA.
6k
12k
XTAL2
XTAL1
18·7k
200k
42µA
V
CC
24
25
XTAL1
PD
Crystal oscillator input
Power down input
This tristate input pin is designed to power-up the
device in two modes PD0 to PD2 and PD1 to PD2.
For further information please refer to the Functional
Description.
See pin 23
V
CC
300k
PD
124k
V
EE
26
DETB
Anti-jam detector input
DETB input is configured as a high impedance input
where the signal is DC restored on the peak of the
signal, with the aid of capacitor C10.
For further information please refer to the Anti
Jamming Circuit
V
CC
3µA
DETB
27
RSSI
RSSI output
The RSSI output is configured as a low impedance
output. Tracking of the receive baseband signal is
achieved by an internal current source. See pins 3
and 11.
For further information please refer to IF Amp/RSSI
Detector
RSSI
7µA
V
EE
28
IFFLT2
Noise reducing IF filter
Table 1 Pin descriptions (continued)
See pin 1
6
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
