ADF7901BRU datasheet(4/12 Pages) AD

Part #	ADF7901BRU

Description	High Performance ISM Band ASK/FSK Transmitter IC

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ADF7901

Preliminary Technical Data

Rev. PrD | Page 4 of 12

Parameter1

Min

Typ

Max

Unit

PHASE-LOCKED LOOP

VCO Gain

30

MHz/V at 384 MHz

Spurious7,

3

100 kHz loop BW

Integer Boundary

–45

−23

dBc

Reference

−70

−23

dBc

Harmonics

3

Second Harmonic VDD = 3.0 V

−24

−21

dBc

Third Harmonic VDD = 3.0 V

−14

−11

dBc

All Other Harmonics

−18

dBc

REFERENCE INPUT

Crystal Reference

9.8304

MHz

POWER AMPLIFIER

PA Output Impedance

97 Ω + 6.4

pF

At 384 MHz

TIMING INFORMATION

Crystal Oscillator to PLL Lock

3

2

3

ms

PA Enable to PA ready–PLL Settle8

100

250

µs

TEMPERATURE RANGE – TA

0

50

°C

1 Operating temperature range is as follows: 0°C to +50°C.

2 Frequency Deviation = 34 × (9.8304 MHz )/214. Error in the crystal will be reflected in variation in the desired deviation.

3 Not production tested. Based on characterization.

4 The output power can be varied in both ASK/FSK mode by altering the relevant external resistor.

5 Measured using Spectrum Analyzer, 1 MHz span, 100 kHz RBW, MAX HOLD enabled.

6 Maximum power-down current spec applies for the OSC2 pin grounded.

7 Measured > 461.9 kHz away from channel.

8 This spec refers to the time taken for the PLL to regain lock after the PA has been enabled. The PA is should only be enabled after the PLL has settled to the correct

frequency.

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