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EVAL-ADF7020DBZ3 PDF预览

EVAL-ADF7020DBZ3

更新时间: 2022-04-14 19:30:13
品牌 Logo 应用领域
亚德诺 - ADI ISM频段
页数 文件大小 规格书
48页 719K
描述
High Performance, ISM Band, FSK/ASK Transceiver IC

EVAL-ADF7020DBZ3 数据手册

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ADF7020  
Data Sheet  
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.  
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.  
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.  
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.  
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.  
Rev. D | Page 4 of 48  
 

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