ADF7021-V Ver la hoja de datos (PDF) - Analog Devices

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ADF7021-V

High Performance, Narrow-Band Transceiver IC

Analog Devices 

ADF7021-V

–100

–102

–104

–106

RF FREQ = 860MHz

2FSK MODULATION

DATA RATE = 9.6kbps

IFBW = 25kHz

VDD = 3.0V

TEMPERATURE = 25°C

–108

–110

–112

DISCRIMINATOR BANDWIDTH =

2× FSK FREQUENCY DEVIATION

–114

–116 DISCRIMINATOR BANDWIDTH =

1× FSK FREQUENCY DEVIATION

–118

0

0.2

0.4

0.6

0.8

1.0

1.2

MODULATION INDEX

Figure 29. 2FSK Sensitivity vs. Modulation Index and Correlator

Discriminator Bandwidth

0

–1

THRESHOLD DETECTION

–2

VITERBI DETECTION

–3

–4

–5 3FSK MODULATION

VDD = 3.0V, TEMP = 25°C

DATA RATE = 9.6kbps

–6 fDEV = 2.4kHz

RF FREQ = 868MHz

IFBW = 18.75kHz

–7

–120 –118 –116 –114 –112 –110 –108 –106 –104 –102 –100

INPUT POWER (dBm)

Figure 30. 3FSK Receiver Sensitivity Using Viterbi Detection and

Threshold Detection

–70

2FSK MODULATION

DATA RATE = 9.6kbps

–80

HIGH MIXER

LINEARITY

fDEV = 4kHz

IFBW = 12.5kHz

DEMOD = CORRELATOR

SENSITIVITY @ BER = 10–3

IP3 = –5dBm

–90

–100

–110

–120

IP3 = –3dBm

DEFAULT

MIXER

LINEARITY

IP3 = –9dBm

IP3 = –13.5dBm

IP3 = –20dBm

IP3 = –24dBm

–130

3, 72

(LOW GAIN MODE)

10, 72

(MEDIUM GAIN MODE)

30, 72

(HIGH GAIN MODE)

LNA GAIN, FILTER GAIN

Figure 31. 2FSK Receiver Sensitivity vs. LNA Gain/IF Filter Gain and Mixer

Linearity Settings (Input IP3 at Each Setting Also Shown)

Rev. 0 | Page 20 of 60

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