ADF7021 datasheet(4/44 Pages) AD

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ADF7021

Preliminary Technical Data

Rev. PrI | Page 4 of 44

SPECIFICATIONS

VDD = 2.3 V to 3.6 V, GND = 0 V, TA = TMIN to TMAX, unless otherwise noted. Typical specifications are at VDD = 3 V, TA = 25°C.

All measurements are performed with the EVAL-ADF7021DBx using PN9 data sequence, unless otherwise noted.

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions

RF CHARACTERISTICS

Frequency Ranges (Direct Output)

135

650

MHz

External VCO inductor

Frequency Ranges (Divide-by-2 Mode)

325

MHz

External VCO inductor, divide-by-2 enabled

Frequency Ranges (Direct Output)

862

940

MHz

Internal VCO inductor

Frequency Ranges (Divide-by-2 Mode)

431

470

MHz

Internal VCO inductor, divide-by-2 enabled

Phase Frequency Detector (PFD)

Frequency

RF/256

TBD

MHz

TRANSMISSION PARAMETERS

Data Rate

0.05

kbps

Frequency Shift Keying

Frequency Deviation1

Phase frequency detector (PFD) = 3.625 MHz

306

PFD = 20 MHz

Deviation Frequency Resolution

PFD = 3.625 MHz

Gaussian Filter BT

0.5

Raised Cosine Filter Alpha

0.5

Transmit Power 2

−20

+13

dBm

VDD = 3.0 V, TA = 25°C

Transmit Power Variation vs. Temperature

±1

From −40°C to +85°C

Transmit Power Variation vs. VDD

±1

From 2.3 V to 3.6 V at 915 MHz, TA = 25°C

Transmit Power Flatness

±1

From 902 MHz to 928 MHz, 3 V, TA = 25°C

Programmable Step Size

−20 dBm to +13 dBm

0.3125

Spurious Emissions

Integer Boundary

−55

dBc

50 kHz loop bandwidth (BW)

Reference

−65

dBc

Harmonics

Second Harmonic

−27

dBc

Unfiltered conductive

Third Harmonic

−21

dBc

Unfiltered conductive

All Other Harmonics

−35

dBc

Unfiltered conductive

Optimum PA Load Impedance3

39 + j61

FRF = 915 MHz

48 + j54

FRF = 868 MHz

54 + j94

FRF = 433 MHz

RECEIVER PARAMETERS

2FSK Input Sensitivity

Bit error rate (BER) = 10−3, FRF = 915 MHz, low

noise amplifier (LNA) and power amplifier

(PA) matched separately4

Sensitivity at 1 kbps

−125

dBm

FDEV = 1 kHz, high sensitivity mode5

LNA and Mixer, Input IP3

Enhanced Linearity Mode

6.8

dBm

Pin = −20 dBm, 2 CW interferers

Low Current Mode

−3.2

dBm

FRF = 915 MHz, F1 = FRF + 3 MHz

High Sensitivity Mode

−35

dBm

F2 = FRF + 6 MHz, maximum gain

Rx Spurious Emissions6

−57

dBm

<1 GHz at antenna input

−47

dBm

>1 GHz at antenna input

AFC

Maximum Pull-In Range

±127.5

kHz

Response Time

Bits

Mod index = 0.875

Accuracy

kHz

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