2 dB LSB, 4-Bit, Silicon Digital Attenuator,
9 kHz to 40 GHz
Data Sheet
ADRF5721
FEATURES
FUNCTIONAL BLOCK DIAGRAM
ADRF5721
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
16 15
14
13
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
1
2
12
11
10
9
VDD
D4/SERIN
D5/CLK
GND
SERIAL/
PARALLEL
INTERFACE
VSS
3
4
GND
4-BIT DIGITAL
ATTENUATOR
ATTOUT
ATTIN
5
6
7
8
± 0.15 dB to 18 GHz
PACKAGE
BASE
± 0.20 dB to 26 GHz
± 0.60 dB to 40 GHz
Figure 1.
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)
GENERAL DESCRIPTION
The ADRF5721 is a silicon, 4-bit digital attenuator with a 30 dB
attenuation control range in 2 dB steps.
semiconductor (CMOS)-/low voltage transistor to transistor
logic (LVTTL)-compatible controls.
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 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 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
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.
Rev. 0
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