MICROWAVE CORPORATION

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9

2 dB LSB GaAs MMIC 3-BIT DIGITAL

ATTENUATOR, 0.7 - 3.7 GHz

HMC288MS8

v00.0600

Control & Bias Voltages

Truth Table

Application Circuit

DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer specific

frequency to pass with minimal loss. R1 = 5K Ohm is required to supply voltage to the circuit throught either PIN 5 or PIN 8.

Control Voltage Input

Attenuation

Setting

RF1 - RF2

V1

8 dB

V2

4 dB

V3

2 dB

High

High

High

Reference

I.L.

High

High

Low

2 dB

High

Low

High

4 dB

Low

High

High

8 dB

Low

Low

Low

14 dB

Max. Atten.

Any combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.

State

Bias Condition

Low

0 to +0.2V @ 20 uA Max.

High

Vdd ± 0.2V @ 50 uA Max

Note: Vdd = +3V to 5V ± 0.2V