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ISM Band
FSK Receiver IC
ADF7902
FEATURES
Single-chip, low power UHF receiver
Companion receiver to ADF7901 transmitter
Frequency range: 369.5 MHz to 395.9 MHz
Eight RF channels selectable with three digital inputs
Modulation parameters supported
FSK demodulation
2 kbps data rate
34.8 kHz frequency deviation
5.0 V supply voltage
Low power consumption
18.5 mA with receiver enabled
1 μA standby current
24-lead TSSOP
GENERAL DESCRIPTION
The ADF7902 is a low power UHF receiver. The device demodu-
lates frequency shift keyed (FSK) signals with 34.8 kHz frequency
deviation and at data rates of up to 2 kbps. There are eight specific
RF channels ranging from 369.5 MHz to 395.9 MHz on which the
receiver can operate. Each channel is selectable by configuring
three digital control lines.
The ADF7902 is designed for low power applications, consuming
18.5 mA (typical) during normal operation and 1 μA (maximum)
in standby mode.
FUNCTIONAL BLOCK DIAGRAM
GND
CE
ADF7902
LNA_1
LNA
LNA_2
IF FILTER
FSK
DEMODULATOR
Rx_DATA
VBAT1
CREG1
VBAT2
CREG2
LDO1
CH1_SEL
N DIVIDER
SELECT
LDO2
CH2_SEL
CH3_SEL
VCO
LNA_RSET
BIAS
CP
PFD
OSC
CLKOUT
CLKOUT_ENB
06456-001
RSET
CVCO
VCOIN
CPOUT
OSC1 OSC2
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
ADF7902
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ..............................................6
Applications Information .................................................................7
Applications Circuits ....................................................................7
Test Modes..........................................................................................9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
1/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADF7902
SPECIFICATIONS
V
DD
=5.0 V; GND = 0 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical specifications T
A
= 25°C.
Table 1.
Parameter
CHANNEL FREQUENCIES
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
RECEIVER PARAMETERS
Data Rate
Frequency Deviation
Input Sensitivity
LNA Input Impedance
CHANNEL FILTERING
IF Filter Bandwidth
Adjacent Channel Rejection
Min
Typ
369.5
371.1
375.3
376.9
388.3
391.5
394.3
395.9
2
−34.8
+34.8
−110
128 − j125
200
60
Max
Unit
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
kbps
kHz
kHz
dBm
Ω
kHz
dB
Test Conditions
Data = 0
Data = 1
f
RF
= 388.3 MHz
−3 dB bandwidth
1 MHz offset
Desired signal 3 dB above input sensitivity level,
with interferer power increased until BER = 10
−3
PHASE-LOCKED LOOP
CE High to Receive Data
REFERENCE INPUT
Crystal Reference
INPUT LOGIC LEVELS
Input High Voltage, V
IH
Input Low Voltage, V
IL
OUTPUT LOGIC LEVELS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Output Drive Level
POWER SUPPLY
Voltage Supply
V
DD
Current Consumption
Receiver Enabled
Low Power Sleep Mode
4
9.8304
0.7 × V
DD
0.2 × V
DD
4.5
0.4
2
ms
MHz
V
V
V
V
mA
±25 ppm frequency accuracy
5
18.5
1
V
mA
μA
CE = 1
CE = 0
Rev. 0 | Page 3 of 12
ADF7902
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
VBAT to GND
1
Digital I/O Voltage to GND
LNA_1, LNA_2
Operating Temperature Range
Industrial (B Version)
Storage Temperature Range
Maximum Junction Temperature
TSSOP θ
JA
Thermal Impedance
Lead Temperature, Soldering
Vapor Phase (60 sec)
Infrared (15 sec)
1
Rating
−0.3 V to +6.0 V
−0.3 V to VBAT + 0.3 V
0 dBm
−40°C to +85°C
−40°C to +125°C
125°C
150.4°C/W
235°C
240°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
GND = GND1 = GND1B = GND2 = 0 V.
Rev. 0 | Page 4 of 12
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