RX1000
433.92 MHz ASH Receiver
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page 1 of 4
http://www.rfm.com
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. RX1000-121198
•Ideal for 433.92 MHz, 3 V Receivers in Europe (I-ETS 300 220)
•High-Sensitivity Passive Design with No RF Oscillation
•Baseband Data Rate of 2400 b/s
•Simple to Apply with External Parts Count
•Rugged, Surface-Mount Package with 130 mm2 Footprint
This amplifier-sequenced hybrid (ASH) receiver is based on several leading-edge
technologies that allow outstanding performance in a small and simple-to-apply mod-
ule. Two surface-accoustic-wave (SAW) devices are employed. Front-end filtering
by a low-loss coupled-resonator SAW filter provides excellent selectivity. Typical
sensitivity better than -100 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 1.1 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, security and data-link
devices operating in Europe under ETSI I-ETS 300 220.
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Operating Radio Frequency fC2, 3 433.92 Nominal MHz
Received Carrier Modulation Type 4, 5 Pulse Modulation (OOK)
RF Band Sensitivity
6
-100 dBm
Operating Signal Strength -10
Channel Width fC±200 kHz
Input Impedance ZIN 50 Nominal Ω
Interference Rejection Half-Frequency Spurious 7105 dB
fC±1 MHz 20
Sequencing (Sampling) Sample Duration 8700 ns
Sample Repetition Rate 250 kHz
Baseband Data Rate 92.4 kb/s
3 dB Bandwidth 2.4 kHz
Comparator Threshold Default (Terminal 5 NC) 10 25 mV
Override (Terminal 5 LOW) 0
Digital Output CMOS Load Capacitance
11
10 pF
Output HIGH Voltage VOH VCC -0.2 VCC V
Output LOW Voltage VOL 0.0 0.2
Rise Time tR9µs
Fall Time tF9
Power Supply Operating Voltage VCC 12.7 3.0 3.5 VDC
Current at 25C and 3.0 V ICC 1.1 1.25 mA
Operating Ambient Temperature TA1-40 +85 °C
Lid Symbolization (in addition to Lot and/or Date Codes) RFM RX1000
SM-10 Case
The RX Series SMT Hybrid ASH Receivers
RF Monolithics, Inc. Phone: (972)233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page2 of 4
http://www.rfm.com
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. RX1000-121198
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, specifications apply over the entire specified operating temperature and voltage ranges.
2. One or more of the following United States patents apply: 4,454,488; 4,616,197; 4,749,964; 4,902,925. Other patents are pending.
3. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the
equipment manufacturer.
4. The design, manufacturing process, and specifications of this device are subject to change without notice.
5. A variety of on-off-keyed (OOK) pulse modulation schemes are possible since digital decoding is an external function (not included
in the ASH receiver).
6. These parameters apply over the absolute minimum operating passband which is referenced to fC.
7. With interfering signal matched to the receiver modulation and code. See “Typical Modulated Interference Rejection” for a more
detailed view.
8. Sample repetition rates greater than 1 MHz are available in custom versions. Contact RFM for details.
9. Baseband data rates are available to 20 kbps, respectively, in custom versions. Contact RFM for details. See HX/RX Designer’s
Guide for details on data rate limits.
10. The default comparator threshold (with terminal 5 not connected) is optimized for low duty-cycle, or “bursty” data and eliminates
noise output when there is no RF signal. The override threshold (with terminal 5 connected to ground) is optimized for continuous
data.
11. The ASH receiver is designed to drive a single CMOS load.
12. For ESD protection.
Block Diagram and Electrical Connections
Absolute Maximum Ratings
Rating Value Units
Incident RF Power +10 dBm
Power Supply Voltage (VCC to Ground) (Observe ESD Precautions) -0.3 to +4.0 VDC
ESD (100 pF, 1.5 kΩ) Terminals 2, 3, or 7 to Ground ±2000 V
All Other Terminals to Ground ±300
Case Temperature -40 to +100 °C
Top View
50 ohm Antenna
+3V 10 uF
0.1 to 10 uF
1 uF
Pulse
Gen-
erator
SAW
Delay
Line LPF
RF
Amp. RF
Amp.
SAW BPF
Comparator
AM
Detector
10 9876
54321
RF Input Gnd Gnd Data Output Voltage
Reference
Vcc Baseband
Output Comparator
Input Gnd Threshold
Override
Note 12
The RX Series SMT Hybrid ASH Receivers
RF Monolithics, Inc. Phone: (972)233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page3 of 4
http://www.rfm.com
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. RX1000-121198
Demonstration Circuit
Typical Modulated Interference Rejection (433.92 MHz RX1000 Shown)
This plot is for an interfacing signal modulated with the receiver’s modulation and code. Continuous wave (CW) or signals with other
modulation or codes typically result in significantly better rejection performance.
+ +
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
+
Piezo
Alarm
620 K
0.1 uF
33 K
0.1 uF
1 mA @ 3VDC
RS 273-065A or equiv
+
+
+
+3V
Lithium
CR2032
1 uF
OPEN: Default 25mV
CLOSED: Override OV
.1 to 1uF
10 uF 1 Vcc
2 BB Out
3 Comp In
4 Gnd
5 Thres
Override
RF In 10
Gnd 9
Gnd 8
Data Out 7
Vref 6
Top View
MC145028 Decoder
Note 12
433.92
Operating Freq.
216.96
Half Freq. Spurious
Response
Frequency (MHz)
Spurious Rejection Relative to Passband Sensitivity (dB)
140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640120
0
10
20
30
40
50
60
70
80
90
100
110
0
10
20
30
40
50
60
70
80
90
100
110
The RX Series SMT Hybrid ASH Receivers
RF Monolithics, Inc. Phone: (972)233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page4 of 4
http://www.rfm.com
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. RX1000-121198
Case Design
Typical Antennas
Dimensions Units Frequency
303.825 418.0 433.92 916.5
AInches 5.35 3.9 3.55 1.58
Millimeters 135.89 99.06 90.17 40.13
BInches 1.0 0.6 0.6 0.4
Millimeters 25.4 15.24 15.24 10.16
CInches 0.25 0.6 0.55 0.18
Millimeters 6.35 15.24 13.97 4.57
DInches 3.7 2.7 2.4 1.0
Millimeters 93.98 68.58 60.96 25.4
EInches 0.375 0.1 0.1 0.1
Millimeters 9.53 2.54 2.54 2.54
FNumber of
Turns 4T 16T 15T 7T
GAWG #20 #22 #22 #24
0.10
(2.54)
0.370
(9.40)
0.540
(13.72)
0.241
(6.12)
0.050
(1.27)
10 Places
0.100
(2.54)
4 Places
0.065
(1.65)
10 Places
0.070
(1.78)
4 Places
RFM
Rxxxxx
Inner Dia = E
No. Turns = F
Enameled Wire, AWG = G
A
BCD
Ground Plane
50 Ω
