ADRF6821 datasheet(25/61 Pages) AD

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Data Sheet

ADRF6821

Rev. A | Page 25 of 61

APPLICATIONS INFORMATION

BASIC CONNECTIONS

RFIN_FB1

100pF

RF INPUT 0

24 25 26 27

DC DAC

÷2

SPI

PFD

Δ-Σ

DC DAC

RFIN_FB0

100pF

RF INPUT 0

CPOUT

VTUNE

EX_LO_IN–

EX_LO_IN+

100pF

RF_SEL0

RF_SEL1

25Ω

35.7Ω

39Ω

220Ω

VTUNE

CPOUT

0.1µF

I OUTPUT

TC 1-1-13MX+

25Ω

35.7Ω

0.1µF

39Ω

4300pF

0.12µF

EX LO INPUT

TCM 1-8 3X+

25Ω

35.7Ω

39Ω

0.1µF

Q OUTPUT

TC 1-1-13MX+

25Ω

35.7Ω

0.1µF

39Ω

Figure 47. Typical Application Circuit

Table 15. Typical Connections

Pin No.

Mnemonic

Description

Basic Connection

RF Inputs

4, 11

RFIN_FB0, RFIN_FB1

RF inputs

The single-ended RF inputs have a 50 Ω impedance.

These pins must be ac-coupled. Terminate unused

RF inputs with a dc blocking capacitor to ground

to improve isolation. Refer to the Layout section

for the recommended PCB layout.

RF Balun Optimization

RFBT_FB

RF balun tuning inductor

Connect the balun tuning inductor (LTUNE) to ground.

GPIOs

9, 10

RF_SEL0, RF_SEL1

RF select control pins

Active high. 1.8 V and 3.3 V logic level compatible.

See the Theory of Operation section for RF select

pin use.

SLEEP

Sleep mode enable pin

Active high. 1.8 V and 3.3 V logic level compatible.

ADRF6821 Datasheet(PDF) 25 Page - Analog Devices

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