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ASH Receiver
Ideal for 868.35 MHz, 3 V data Receivers in Europe
High-Sensitivity Passive Design with No RF Oscillation
Use with HX4007 for 19.2 kbps Data Rate
Simple to Apply with External Parts Count
Rugged, Surface-Mount Package with 130 mm
2
Footprint
This amplifier-sequenced hybrid (ASH) receiver is based on several leading-edge
SM-10 Case
technologies that allow outstanding performance in a small and simple-to-apply
module. Two surface-accoustic-wave (SAW) devices are employed. Front-end fil-
tering by a low-loss coupled-resonator SAW filter provides excellent selectivity. Typ-
ical sensitivity better than -80 dBm is achieved with no RF oscillating or regenerative circuits. This results in virtually no RF spurious
emissions. A low-loss SAW delay line provides the time delay necessary to sequence the two RF amplifiers. Time sequencing of the RF
gain eliminates the need for frequency conversion prior to AM detection. This receiver is designed to operate from 3 V lithium battery
with typically 2.5 mA current. For system design flexibility, the baseband output is accessible, and the comparator threshold can be
changed externally between two settings. Typical applications include unlicensed wireless remote-controls and digital data links operat-
ing in Europe under the European Telecommunication Standard (ETSI) 300-220-1.
Electrical Characteristics
Characteristic
Operating Radio Frequency
Received Carrier Modulation Type
RF Band
Sensitivity
Operating Signal Strength
Channel Width
Input Impedance
Interference Rejection
Sequencing (Sampling)
Data Rate
Comparator Threshold
Digital Output
Default (Terminal 5 LOW)
Override (Terminal 5 LOW)
Sym
f
C
Notes
2,3
4,5
Minimum
Typical
868.35 Nominal
Maximum
Units
MHz
Pulse Modulation (OOK)
-71
-10
dBm
kHz
50 Nominal
W
dB
ns
kHz
kbps
mV
10
p
F
V
6
Z
IN
7
8
9
10
f
C
鹵200
80
15
700
625
56
25
0
Half-Frequency Spurious
f
C
鹵 1 MHz
Sample Duration
Sample Repetition Rate
CMOS Load Capacitance
Output HIGH Voltage
Output LOW Voltage
Rise Time
Fall Time
V
OH
V
OL
t
R
t
F
V
CC
I
CC
T
A
1
1
2.7
11
V
CC
-0.2
0.0
3
3
3.0
4
-40
RFM RX4756
V
CC
0.2
ms
3.5
5
+85
VDC
mA
擄C
Power Supply
Operating Voltage
Current at 25C and 3.0 V
Operating Ambient Temperature
Lid Symbolization (in addition to Lot and/or Date Codes)
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
漏1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc
E-mail: info@rfm.com
http://www.rfm.com
RX4756-121198
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