ADF7021 datasheet(19/64 Pages) AD

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Data Sheet

ADF7021

Rev. B | Page 19 of 64

RES BW 300Hz

CENTER 869.5MHz

VBW 300Hz

SPAN 50Hz

SWEEP2.226s (401pts)

REF 15dBm

SAMP LOG 10dB/

ATTEN 25dB

VAVG 100

V1 V2

S3 FC

DR = 9.6kbps

DATA = PRS9

fDEV = 2.4kHz

RF FREQ = 869.5MHz

3FSK

RC3FSK

Figure 17. Output Spectrum in 3FSK and Raised Cosine 3FSK Modes

FREQUENCY OFFSET (kHz)

–10

–20

–30

–40

–100

–50

100

–50

–60

RAMP RATE:

CW ONLY

256 CODES/BIT

128 CODES/BIT

64 CODES/BIT

32 CODES/BIT

TRACE = MAX HOLD

PA ON/OFF RATE = 3Hz

PA ON/OFF CYCLES = 10000

VDD = 3.0V

Figure 18. Output Spectrum in Maximum Hold

for Various PA Ramp Rate Options

–8

–7

–6

–5

–4

–3

–2

–1

–122

–120

–118

–116

–114

–112

–110

–108

–106

–104

3.0V, +25°C

3.6V, –40°C

2.3V, +85°C

RF INPUT POWER (dBm)

DATA RATE = 9.6kbps

fDEV = 4kHz

RF FREQ = 868MHz

IF BW = 25kHz

Figure 19. 2FSK Sensitivity vs. VDD and Temperature, fRF = 868 MHz

–8

–7

–6

–5

–4

–3

–2

–1

–130 –128 –126 –124 –122 –120 –118 –116 –114 –112 –110 –108

3.6V, –40°C

3.0V, +25°C

2.3V, +85°C

RF INPUT POWER (dBm)

DATA RATE = 1kbps

fDEV = 1kHz

RF FREQ = 135MHz

IF BW = 12.5kHz

Figure 20. 2FSK Sensitivity vs. VDD and Temperature, fRF = 135 MHz

–8

–7

–6

–5

–4

–3

–2

–1

–120

–115

–110

–105

–100

–95

RF INPUT POWER (dBm)

2.3V +25°C

3.0V +25°C

3.6V +25°C

2.3V –40°C

3.0V –40°C

3.6V –40°C

2.3V +85°C

3.0V +85°C

3.6V +85°C

3FSK MODULATION

DATA RATE = 9.6kbps

fDEV = 2.4kHz

MOD INDEX = 0.5

RF FREQ = 440 MHz

Figure 21. 3FSK Sensitivity vs. VDD and Temperature, fRF = 440 MHz

–8

–7

–6

–5

–4

–3

–2

–1

–120

–115

–110

–105

–100

–95

RF INPUT POWER (dBm)

2.3V +25°C

3.0V +25°C

3.6V +25°C

2.3V –40°C

3.0V –40°C

3.6V –40°C

2.3V +85°C

3.0V +85°C

3.6V +85°C

DATA RATE = 19.6kbps

SYMBOL RATE = 9.8ksym/s

fDEV (inner) = 2.4kHz

MOD INDEX = 0.5

RF FREQ = 420MHz

IF BW = 12.5kHz

Figure 22. 4FSK Sensitivity vs. VDD and Temperature, fRF = 420 MHz

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