2 dB LSB, 4-Bit, Silicon Digital Attenuator,

9 kHz to 40 GHz

Data Sheet

ADRF5721

Rev. 0

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FEATURES

Ultrawideband frequency range: 9 kHz to 40 GHz

Attenuation range: 2 dB steps to 30 dB

Low insertion loss

1.6 dB to 18 GHz

2.0 dB to 26 GHz

3.4 dB to 40 GHz

Attenuation accuracy

±(0.1 + 1.0%) of attenuation state up to 18 GHz

±(0.1 + 2.5%) of attenuation state up to 26 GHz

±(0.6 + 10.0%) of attenuation state up to 40 GHz

Typical step error

±0.15 dB to 18 GHz

±0.20 dB to 26 GHz

±0.60 dB to 40 GHz

High input linearity

P0.1dB insertion loss state: 30 dBm

P0.1dB other attenuation states: 26 dBm

IP3: 50 dBm typical

High RF input power handling: 26 dBm average, 30 dBm peak

Tight distribution in relative phase

No low frequency switching spurs

SPI and parallel mode control, CMOS/LVTTL compatible

RF amplitude settling time (0.1 dB of final RF output): 8.5 μs

2.5 mm × 2.5 mm, 16-terminal LGA package

Pin compatible with ADRF5731, fast switching version

APPLICATIONS

Industrial scanners

Test and instrumentation

Cellular infrastructure: 5G millimeter wave

Military radios, radars, electronic counter measures (ECMs)

Microwave radios and very small aperture terminals (VSATs)

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADRF5721 is a silicon, 4-bit digital attenuator with a 30 dB

attenuation control range in 2 dB steps.

This device operates from 9 kHz to 40 GHz with better than 3.4 dB

of insertion loss. The ATTIN port of the ADRF5721 has a radio

frequency (RF) input power handling capability of 26 dBm

average and 30 dBm peak for all states.

The ADRF5721 requires a dual supply voltage of +3.3 V and

−3.3 V. The device features serial peripheral interface (SPI),

parallel mode control, and complementary metal-oxide

semiconductor (CMOS)-/low voltage transistor to transistor

logic (LVTTL)-compatible controls.

The ADRF5721 is pin compatible with the ADRF5731, the fast

switching version, which operates from 100 MHz to 40 GHz.

The ADRF5721 RF ports are designed to match a characteristic

impedance of 50 Ω.

The ADRF5721 comes in a 16-terminal, 2.5 mm × 2.5 mm,

RoHS compliant, land grid array (LGA) package and operates

from −40°C to +105°C.

PACKAGE

BASE

SERIAL/

PARALLEL

INTERFACE

4-BIT DIGITAL

ATTENUATOR

VDD

D4/SERIN

VSS

GND

ADRF5721

ATTOUT

1

D5/CLK

2

GND

3

ATTIN

4

12

11

10

9

6

5

78

16

15

14

13