AD7021 IC Datasheet

AD7021 Datasheet PDF, Equivalent


Part Number

AD7021

Description

High Performance Narrowband ISM Transceiver IC

Manufacture

Analog Devices

Total Page 30 Pages
Datasheet
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AD7021
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Preliminary Technical Data
High Performance Narrowband
ISM Transceiver IC
ADF7021
FEATURES
Low power, low IF transceiver
Frequency bands
80 MHz to 650 MHz
862 MHz to 940 MHz
Modulation schemes
2FSK, 3FSK, 4FSK
Spectral shaping
Gaussian and raised-cosine filtering
Data rates supported
0.05 kbps to 25 kbps
2.3 V to 3.6 V power supply
Programmable output power
−16 dBm to +13 dBm in 63 steps
Automatic PA ramp control
Receiver sensitivity
−125 dBm at 1 kbps, 2 FSK
On-chip VCO and fractional-N PLL
RSET
On-chip 7-bit ADC and temperature sensor
Fully automatic frequency control loop (AFC)
Digital RSSI
Integrated Tx/Rx switch
Leakage current <1 μA in power-down mode
APPLICATIONS
Narrow-band standards
ETSI EN 300-220, FCC Part 90, FCC Part 15, FCC Part 95,
ARIB STD-T67
Low cost, wireless data transfer
Remote control/security systems
Wireless metering
Private mobile radio
Wireless medical telemetry service (WMTS)
Keyless entry
Home automation
Process and building control
Pagers
FUNCTIONAL BLOCK DIAGRAM
CE CREG(1:4)
MUXOUT
RLNA
POLARIZATION
TEMP
SENSOR
MUX
7-BIT ADC
LDO(1:4)
TEST MUX
RFIN
RFINB
LNA
GAIN
IF FILTER
RSSI/
OFFSET
CORRECTION
2FSK
3FSK
4FSK
DEMODULATOR
CLOCK
AND DATA
RECOVERY
Tx/Rx
CONTROL
PA RAMP
RFOUT
DIVIDERS/
MUXING
MUX
VCO
AGC
CONTROL
AFC
CONTROL
SERIAL
PORT
DIV P
N/N + 1
Σ-Δ
MODULATOR
2FSK
3FSK
4FSK
MOD CONTROL
CP PFD
DIV R
RING OSC
CLK
DIV
GAUSSIAN/
RAISED COSINE
FILTER
3FSK
ENCODING
L1 L2 VCOIN CPOUT
OSC1 OSC2
Figure 1.
CLKOUT
DATA CLK | TxDATA
DATA I/O | RxDATA
SWD
SLE
SDATA
SREAD
SCLK
Rev. PrI
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
DataSheet4 U .com
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
©2006 Analog Devices, Inc. All rights reserved.

AD7021
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ADF7021
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 3
Specifications..................................................................................... 4
Timing Characteristics..................................................................... 7
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Pin Configuration and Function Descriptions........................... 10
Frequency Synthesizer ................................................................... 12
Reference Input........................................................................... 12
MUXOUT.................................................................................... 13
Voltage Controlled Oscillator (VCO) ...................................... 14
Choosing Channels for Best System Performance................. 14
Transmitter ...................................................................................... 15
RF Output Stage.......................................................................... 15
Modulation Schemes.................................................................. 15
Spectral Shaping ......................................................................... 17
Modulation and Filtering Options ........................................... 17
Receiver Section.............................................................................. 18
RF Front End............................................................................... 18
RSSI/AGC.................................................................................... 19
FSK Demodulators on the ADF7021....................................... 19
FSK Correlator/Demodulator................................................... 19
Linear 2FSK Demodulator ........................................................ 21
3FSK Demodulator..................................................................... 21
4FSK Demodulator..................................................................... 21
Preliminary Technical Data
AFC Section ................................................................................ 21
Automatic Sync Word Recognition ......................................... 22
Applications..................................................................................... 23
LNA/PA Matching...................................................................... 23
Transmit Protocol and Coding Considerations ..................... 24
Device Programming after Initial Power-Up ........................... 24
Interfacing to Microcontroller/DSP ........................................ 26
Serial Interface ................................................................................ 27
Readback Format........................................................................ 27
Register 0—N Register............................................................... 28
Register 1—VCO/Oscillator Register ...................................... 29
Register 2—Transmit Modulation Register ............................ 30
Register 3—Transmit/Receive Clock Register........................ 31
Register 4—Demodulator Setup Register ............................... 32
Register 5—IF Filter Setup Register......................................... 33
Register 6—IF Fine Cal Setup Register ................................... 34
Register 7—Readback Setup Register...................................... 35
Register 8—Power Down Test Register................................... 36
Register 9—AGC Register......................................................... 37
Register 10—AFC Register ....................................................... 38
Register 11—Sync Word Detect Register................................ 39
Register 12—SWD/Threshold Setup Register........................ 40
Register 13—3FSK Demod Register ........................................ 41
Register 14—Test-DAC Register .............................................. 41
Register 15—Test Mode Register ............................................. 42
Outline Dimensions ....................................................................... 44
Ordering Guide .......................................................................... 44
DataSheet4 U .com
Rev. PrI | Page 2 of 44


Features www.DataSheet4U.com Preliminary Technic al Data FEATURES Low power, low IF tran sceiver Frequency bands 80 MHz to 650 M Hz 862 MHz to 940 MHz Modulation scheme s 2FSK, 3FSK, 4FSK Spectral shaping Gau ssian and raised-cosine filtering Data rates supported 0.05 kbps to 25 kbps 2. 3 V to 3.6 V power supply Programmable output power −16 dBm to +13 dBm in 63 steps Automatic PA ramp control Receiv er sensitivity −125 dBm at 1 kbps, 2 FSK On-chip VCO and fractional-N PLL H igh Performance Narrowband ISM Transcei ver IC ADF7021 On-chip 7-bit ADC and te mperature sensor Fully automatic freque ncy control loop (AFC) Digital RSSI Int egrated Tx/Rx switch Leakage current <1 μA in power-down mode APPLICATIONS N arrow-band standards ETSI EN 300-220, F CC Part 90, FCC Part 15, FCC Part 95, A RIB STD-T67 Low cost, wireless data tra nsfer Remote control/security systems W ireless metering Private mobile radio W ireless medical telemetry service (WMTS ) Keyless entry Home automation Process and building control Pagers .
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