ADF7901BRUZ1 datasheet(4/12 Pages) AD

Part #	ADF7901BRUZ1

Description	High Performance ISM Band OOK/FSK Transmitter IC

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ADF7901

Rev. A | Page 4 of 12

Parameter

Min

Typ

Max

Unit

Comments/Conditions

PHASE-LOCKED LOOP

VCO Gain

30

MHz/V

At 384 MHz

Spurious3, 7

100 kHz loop BW

Integer Boundary

–45

−23

dBc

Reference

−70

−23

dBc

Harmonics3

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

Crystal ESR8

80

Ω

POWER AMPLIFIER

PA Output Impedance

97 Ω + 6.4 pF

At 384 MHz

TIMING INFORMATION

Crystal Oscillator to PLL Lock3

2

3

ms

PA Enable to PA Ready–PLL Settle9

100

250

μs

TEMPERATURE RANGE (TA)

0

50

°C

1 Operating temperature range is 0°C to 50°C.

2 Frequency Deviation = 58 × (9.8304 MHz)/214. Error in the crystal is 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, maximum hold enabled.

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

7 Measured >461.9 kHz away from channel.

8 Maximum recommended crystal ESR. The crystal oscillator works with crystals with higher ESR, but this results in longer power-up times.

9 This specification 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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