EVAL-ADF7021DBZ5 Datasheet, PDF(44/64 Page) Analog Devices – High Performance Narrow-Band Transceiver IC

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EVAL-ADF7021DBZ5 Datasheet, PDF (44/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

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ADF7021

APPLICATIONS CIRCUIT

The ADF7021 requires very few external components for

operation. Figure 56 shows the recommended application

circuit. Note that the power supply decoupling and regulator

capacitors are omitted for clarity.

Data Sheet

For recommended component values, refer to the ADF7021

evaluation board data sheet and AN-915 application note

accessible from the ADF7021 product page. Follow the

reference design schematic closely to ensure optimum

performance in narrow-band applications.

LOOP FILTER

CVCO

CAP

EXT VCO L*

VDD

TCXO

REFERENCE

VDD

ANTENNA

CONNECTION

T-STAGE LC

FILTER

VDD

MATCHING

RLNA

RESISTOR

VDD

1 VCOIN

2 CREG1

3 VDD1

4 RFOUT

5 RFGND

6 RFIN

7 RFINB

8 RLNA

9 VDD4

10 RSET

11 CREG4

GND4

RSET

RESISTOR

ADF7021

CLKOUT 36

TxRxCLK 35

TxRxDATA 34

SWD 33

VDD2 32

CREG2 31

ADCIN 30

GND2 29

SCLK 28

SREAD 27

SDATA 26

SLE 25

MICROCONTROLLER

Tx/Rx SIGNAL

INTERFACE

VDD

MICROCONTROLLER

CONFIGURATION

INTERFACE

CHIP ENABLE

TO MICROCONTROLLER

*PIN 44 AND PIN 46 CAN BE LEFT FLOATING IF EXTERNAL INDUCTOR VCO IS NOT USED.

NOTES

1. PINS [13:18], PINS [20:21], AND PIN 23 ARE TEST PINS AND ARE NOT USED IN NORMAL OPERATION.

Figure 56. Typical Application Circuit (Regulator Capacitors and Power Supply Decoupling Not Shown)

Rev. B | Page 44 of 64

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