0.5 dB LSB, 6-Bit, Silicon Digital

Attenuator, 9 kHz to 40 GHz

Data Sheet

ADRF5720

Rev. 0

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FEATURES

Ultrawideband frequency range: 9 kHz to 40 GHz

Attenuation range: 0.5 dB steps to 31.5 dB

Low insertion loss with impedance match

2.0 dB up to 18 GHz

2.8 dB up to 26 GHz

4.5 dB up to 40 GHz

Attenuation accuracy with impedance match

±(0.20 + 1.0% of attenuation state) up to 18 GHz

±(0.20 + 1.5% of attenuation state) up to 26 GHz

±(0.40+ 3.0% of attenuation state) up to 40 GHz

Typical step error with impedance match

±0.25 dB up to 26 GHz

±0.65 dB up to 40 GHz

High input linearity

P0.1dB insertion loss state: 30 dBm

P0.1dB other attenuation states: 27 dBm

IP3: 50 dBm typical

High RF input power handling: 27 dBm average, 30 dBm peak

Tight distribution in relative phase

No low frequency spurious signals

SPI and parallel mode control, CMOS/LVTTL compatible

RF amplitude settling time (0.1 dB of final RF output): 8 µs

24-terminal, 4 mm × 4 mm LGA package

Pin-compatible with ADRF5730, 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 ADRF5720 is a silicon, 6-bit digital attenuator with 31.5 dB

attenuation control range in 0.5 dB steps.

This device operates from 9 kHz to 40 GHz with better than 4.5 dB

of insertion loss and excellent attenuation accuracy. The ATTIN

port of the ADRF5720 has a radio frequency (RF) input power

handling capability of 27 dBm average and 30 dBm peak for all

states.

The ADRF5720 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 ADRF5720 is pin-compatible with the ADRF5730, the fast

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

The ADRF5720 RF ports are designed to match a characteristic

impedance of 50 Ω. For wideband applications, impedance

matching on the RF transmission lines can further optimize high

frequency insertion loss, return loss, and attenuation accuracy

characteristics. Refer to the Electrical Specifications section, the

Typical Performance Characteristics section, and the Applications

Information section for more details.

The ADRF5720 comes in a 24-terminal, 4 mm × 4 mm, RoHS

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

−40°C to +105°C.

PS

LE

GND

GND

ATTIN

GND

VSS

VDD

GND

GND

ATTOUT

PACKAGE

BASE

GND

GND

10

18

13

17

16

15

14

11

12

7

8

9

21

20

19

24

23

22

1

6

2

3

4

5

6-BIT DIGITAL

ATTENUATOR

SERIAL/

PARALLEL

INTERFACE

ADRF5720