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v00.0805

Application Circuit

Note:

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

through either Pin 9 or Pin 16.

Truth Table

Control Voltage Input

Attenuation

Setting

RF1 - RF2

V1

8 dB

V2

4 dB

V3

2 dB

V4

1 dB

V5

0.5 dB

High

High

High

High

High

Reference I.L.

High

High

High

High

Low

0.5 dB

High

High

High

Low

High

1 dB

High

High

Low

High

High

2 dB

High

Low

High

High

High

4 dB

Low

High

High

High

High

8 dB

Low

Low

Low

Low

Low

15.5 dB Max.

Atten.

Any combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.

Worst Case Step Error

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0.6

0.5

1

1.5

2

2.5

3

3.5

4

FREQUENCY (GHz)

Control & Bias Voltages

State

Bias Condition

Low

0 to +0.2V @ 1.0 μA Max.

High

Vdd

Note: Vdd = +3V to +5V

±

0.00.20.2

0.2V

Bias Voltage & Current

Vdd = +5.0 Vdc ± 10%

Vdd

(VDC)

Idd (Typ.)

(μA)

+3.0

4.0

+5.0

5.0

0.5 dB LSB GaAs MMIC 5-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, 0.7 - 3.8 GHz