MAAD-011021-000DIE_16 Datasheet, PDF (8/9 Pages) M/A-COM Technology Solutions, Inc. – Digital Attenuator, 6-Bit, 0.5 dB LSB step

MAAD-011021-000DIE
Digital Attenuator, 6-Bit, 0.5 dB LSB step
DC - 40 GHz
Rev. V3
Applications Section
Application Information
The MAAD-011021 is designed for extremely wide
band and robust attenuation applications. It uses a
combination of series and shunt cold channel,
multiple-gate FETs to achieve high linearity and
accurate attenuation repeatability. We recommend
using double bonds at both RF input and output, as
well as keeping bondwires as short as possible to
ensure higher frequency operation. This part is the
most accurate for X-band applications.
The MAAD-011021 has a built in inverter function
which allows a single +5 V / 0 V single control for
each bit. This is useful if you require very fast
switching times and have +5 V / 0 V available.
The MAAD-011021 is DC-coupled at both RF_IN and
RF_OUT. If operation at DC is desired, 0 Ω jumpers
(or continuous 50 Ω RF lines) should be used in
series with RF_IN and RF_OUT. Customer should take
extra care to ensure that the voltage at both RF_IN
and RF_OUT are 0 V; excess voltage can damage the
part. If operation at DC is not required, simply use
series blocking capacitors.
Mounting and Bonding Techniques
The Monolithic Circuit is designed for robust and
reliable usage. The die features complete
passivation on all critical areas as well as a
protective BCB die coat.
The die should be attached directly to the ground
plane with silver conductive epoxy for best results.
A true 50 Ω microstrip or co-planar waveguide is
recommended for bringing RF to and from the die
as shown in the demonstration board below. This
board uses 0.200 mm (8 mils) Rogers 4350 as the
top dielectric layer.
Alternatively one can mount the die directly to the
ground plane and launch with microstrip substrates
in either alumina or Rogers to the same level as
the top of the die, allowing for shorter bond wires.
The RF input and output pads are DC coupled.
Blocking capacitors are required if there is a DC
potential on either port.
PCB Layout
Sample board size above is 28 x 25 mm
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