ADF7021-N datasheet(8/64 Pages) AD

Part #	ADF7021-N

Description	High Performance Narrow-Band Transceiver IC

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ADF7021-N

Rev. 0 | Page 8 of 64

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

RSSI

Range at Input2

−120 to −47

dBm

Linearity

±2

dB

Input power range = −100 dBm to −47 dBm

Absolute Accuracy

±3

dB

Input power range = −100 dBm to −47 dBm

Response Time

390

μs

See the RSSI/AGC section

AFC

Pull-In Range

0.5

1.5 × IF_

FILTER_BW

kHz

The range is programmable in Register 10

(R10_DB[24:31])

Response Time

64

Bits

Accuracy

0.5

kHz

Input power range = −100 dBm to +12 dBm

Rx SPURIOUS EMISSIONS3

Internal Inductor VCO

−91/−91

dBm

<1 GHz at antenna input, unfiltered conductive/filtered

conductive

−52/−70

dBm

>1 GHz at antenna input, unfiltered conductive/filtered

conductive

External Inductor VCO

−62/−72

dBm

<1 GHz at antenna input, unfiltered conductive/filtered

conductive

−64/−85

dBm

>1 GHz at antenna input, unfiltered conductive/filtered

conductive

LNA INPUT IMPEDANCE

RFIN to RFGND

fRF = 915 MHz

24 − j60

Ω

fRF = 868 MHz

26 − j63

Ω

fRF = 450 MHz

63 − j129

Ω

fRF = 426 MHz

68 − j134

Ω

fRF = 315 MHz

96 − j160

Ω

fRF = 175 MHz

178 − j190

Ω

1 Calibration of the image rejection used an external RF source.

2 For received signal levels < −100 dBm, it is recommended to average the RSSI readback value over a number of samples to improve the RSSI accuracy at low input powers.

3 Filtered conductive receive spurious emissions are measured on the EVAL-ADF7021-NDBxx, which includes a T-stage harmonic filter (two inductors and one

capacitor).

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