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High Performance, ISM Band,
FSK/ASK Transceiver IC
ADF7020
FEATURES
Low power, low IF transceiver
Frequency bands
431 MHz to 478 MHz
862 MHz to 956 MHz
Data rates supported
0.15 kbps to 200 kbps, FSK
0.15 kbps to 64 kbps, ASK
2.3 V to 3.6 V power supply
Programmable output power
−16 dBm to +13 dBm in 0.3 dBm steps
Receiver sensitivity
−119 dBm at 1 kbps, FSK
−112 dBm at 9.6 kbps, FSK
−106.5 dBm at 9.6 kbps, ASK
Low power consumption
19 mA in receive mode
26.8 mA in transmit mode (10 dBm output)
−3 dBm IIP3 in high linearity mode
On-chip VCO and fractional-N PLL
On-chip 7-bit ADC and temperature sensor
Fully automatic frequency control loop (AFC) compensates
for ±25 ppm crystal at 862 MHz to 956 MHz or±50 ppm at
431 MHz to 478 MHz
Digital RSSI
Integrated Tx/Rx switch
Leakage current of <1 μA in power-down mode
APPLICATIONS
Low cost wireless data transfer
Remote control/security systems
Wireless metering
Keyless entry
Home automation
Process and building control
Wireless voice
FUNCTIONAL BLOCK DIAGRAM
RSET
CREG[1:4]
ADCIN
MUXOUT
R
LNA
LDO(1:4)
OFFSET
CORRECTION
TEMP
SENSOR
TEST MUX
ADF7020
LNA
RFIN
RFINB
GAIN
OFFSET
CORRECTION
IF FILTER
RSSI
MUX
7-BIT ADC
FSK/ASK
DEMODULATOR
DATA
SYNCHRONIZER
CE
AGC
CONTROL
DATA CLK
Tx/Rx
CONTROL
DATA I/O
FSK MOD
CONTROL
GAUSSIAN
FILTER
Σ-∆
MODULATOR
AFC
CONTROL
INT/LOCK
RFOUT
DIVIDERS/
MUXING
DIV P
N/N + 1
SLE
SERIAL
PORT
SDATA
SREAD
SCLK
DIV R
OSC
CLK
DIV
05351-001
VCO
CP
PFD
VCOIN CPOUT
OSC1
OSC2
CLKOUT
Figure 1.
Rev. C
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 ©2005–2011 Analog Devices, Inc. All rights reserved.
ADF7020
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description ......................................................................... 4
Specifications..................................................................................... 5
Timing Characteristics..................................................................... 8
Timing Diagrams.......................................................................... 8
Absolute Maximum Ratings.......................................................... 10
ESD Caution................................................................................ 10
Pin Configuration and Function Descriptions........................... 11
Typical Performance Characteristics ........................................... 13
Frequency Synthesizer ................................................................... 15
Reference Input........................................................................... 15
Choosing Channels for Best System Performance................. 17
Transmitter ...................................................................................... 18
RF Output Stage.......................................................................... 18
Modulation Schemes.................................................................. 18
Receiver............................................................................................ 20
RF Front End............................................................................... 20
RSSI/AGC.................................................................................... 21
FSK Demodulators on the ADF7020....................................... 21
FSK Correlator/Demodulator................................................... 21
Linear FSK Demodulator .......................................................... 23
AFC .............................................................................................. 23
Automatic Sync Word Recognition ......................................... 24
Applications Information .............................................................. 25
LNA/PA Matching...................................................................... 25
Image Rejection Calibration ..................................................... 26
Transmit Protocol and Coding Considerations ..................... 27
Device Programming after Initial Power-Up ......................... 27
Interfacing to Microcontroller/DSP ........................................ 27
Power Consumption and battery lifetime calculations......... 28
Serial Interface ................................................................................ 31
Readback Format........................................................................ 31
Registers........................................................................................... 32
Register 0—N Register............................................................... 32
Register 1—Oscillator/Filter Register...................................... 33
Register 2—Transmit Modulation Register (ASK/OOK
Mode)........................................................................................... 34
Register 2—Transmit Modulation Register (FSK Mode) ..... 35
Register 2—Transmit Modulation Register (GFSK/GOOK
Mode)........................................................................................... 36
Register 3—Receiver Clock Register ....................................... 37
Register 4—Demodulator Setup Register ............................... 38
Register 5—Sync Byte Register................................................. 39
Register 6—Correlator/Demodulator Register ...................... 40
Register 7—Readback Setup Register...................................... 41
Register 8—Power-Down Test Register .................................. 42
Register 9—AGC Register......................................................... 43
Register 10—AGC 2 Register.................................................... 44
Register 11—AFC Register ....................................................... 44
Register 12—Test Register......................................................... 45
Register 13—Offset Removal and Signal Gain Register ....... 46
Outline Dimensions ....................................................................... 47
Ordering Guide .......................................................................... 47
Rev. C | Page 2 of 48
ADF7020
REVISION HISTORY
5/11—Rev. B to Rev. C
Added Exposed Pad Notation to Outline Dimensions ..............47
Changes to Ordering Guide...........................................................47
8/07—Rev. A to Rev. B
Changes to Features ..........................................................................1
Changes to General Description .....................................................4
Changes to Table 1 ............................................................................5
Changes to Table 2 ............................................................................8
Changes to Reference Input Section.............................................15
Changes to N Counter Section......................................................16
Changes to Choosing Channels for Best Performance Section 17
Changes to Table 5 ..........................................................................20
Changes to FSK Correlator Register Settings Section ................22
Added Image Rejection Calibration Section ...............................26
Added Figure 41 ..............................................................................30
Changes to Readback Format Section..........................................31
Changes to Register 9—AGC Register Comments Section.......43
Added Register 12—Test Register Comments Section ..............45
4/06—Rev. 0 to Rev. A
Changes to Features ..........................................................................1
Changes to Table 1 ............................................................................5
Changes to Figure 24 ......................................................................17
Changes to the Setting Up the ADF7020 for GFSK Section......19
Changes to Table 6 ..........................................................................21
Changes to Table 9 ..........................................................................23
Changes to External AFC Section.................................................23
Deleted Maximum AFC Range Section.......................................23
Added AFC Performance Section.................................................24
Changes to Internal Rx/Tx Switch Section..................................25
Changes to Figure 32 ......................................................................25
Changes to Transmit Protocol and Coding Considerations
Section ..............................................................................................26
Added Text Relating to Figure 37 .................................................27
Changes to Figure 41 ......................................................................31
Changes to Register 1—Oscillator/Filter Register
Comments........................................................................................31
Changes to Figure 42 ......................................................................32
Changes to Register 2—Transmit Modulation Register
(FSK Mode) Comments .................................................................33
Changes to Figure 44 ......................................................................34
Changes to Register 2—Transmit Modulation Register
(GFSK/GOOK Mode) Comments................................................34
Changes to Register 4—Demodulator Setup Register
Comments........................................................................................36
Changes to Figure 51 ......................................................................41
Changes to Figure 53 ......................................................................42
Changes to Ordering Guide...........................................................45
6/05—Revision 0: Initial Version
Rev. C | Page 3 of 48
ADF7020
GENERAL DESCRIPTION
The ADF7020 is a low power, highly integrated FSK/ASK/OOK
transceiver designed for operation in the license-free ISM bands
at 433 MHz, 868 MHz, and 915 MHz, as well as the proposed
Japanese RFID band at 950 MHz. A Gaussian data filter option
is available to allow either GFSK or G-ASK modulation, which
provides a more spectrally efficient modulation. In addition to
these modulation options, the ADF7020 can also be used to
perform both MSK and GMSK modulation, where MSK is a
special case of FSK with a modulation index of 0.5. The modula-
tion index is calculated as twice the deviation divided by the
data rate. MSK is spectrally equivalent to O-QPSK modulation
with half-sinusoidal Tx baseband shaping, so the ADF7020 can
also support this modulation option by setting up the device in
MSK mode.
This device is suitable for circuit applications that meet the
European ETSI-300-220, the North American FCC (Part 15),
or the Chinese Short Range Device regulatory standards. A
complete transceiver can be built using a small number of
external discrete components, making the ADF7020 very
suitable for price-sensitive and area-sensitive applications.
The transmitter block on the ADF7020 contains a VCO and
low noise fractional-N PLL with an output resolution of
<1 ppm. This frequency agile PLL allows the ADF7020 to be
used in frequency-hopping spread spectrum (FHSS) systems.
The VCO operates at twice the fundamental frequency to
reduce spurious emissions and frequency-pulling problems.
The transmitter output power is programmable in 0.3 dB steps
from −16 dBm to +13 dBm. The transceiver RF frequency,
channel spacing, and modulation are programmable using a
simple 3-wire interface. The device operates with a power
supply range of 2.3 V to 3.6 V and can be powered down when
not in use.
A low IF architecture is used in the receiver (200 kHz),
minimizing power consumption and the external component
count and avoiding interference problems at low frequencies.
The ADF7020 supports a wide variety of programmable
features, including Rx linearity, sensitivity, and IF bandwidth,
allowing the user to trade off receiver sensitivity and selectivity
against current consumption, depending on the application.
The receiver also features a patent-pending automatic frequency
control (AFC) loop, allowing the PLL to track out the frequency
error in the incoming signal.
An on-chip ADC provides readback of an integrated tempera-
ture sensor, an external analog input, the battery voltage, or the
RSSI signal, which provides savings on an ADC in some appli-
cations. The temperature sensor is accurate to ±10°C over the
full operating temperature range of −40°C to +85°C. This
accuracy can be improved by doing a 1-point calibration at
room temperature and storing the result in memory.
Rev. C | Page 4 of 48
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