5

5 - 172

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

Order On-line at www.hittite.com

Truth Table

Control Voltage

Bias Voltage & Current

Worst Case Step Error

Between Successive Attenuation States

Vdd = +5.0 Vdc ± 10%

Vdd

(VDC)

Idd (Typ.)

(mA)

+4.5

3.0

+5.0

3.2

+5.5

3.4

State

Bias Condition

Low

0 to +0.8V @ -5 uA Typ.

High

+2.0 to + 5.0 Vdc @ 40 uA Typ.

Note: Vdd = +5V

Control Voltage Input

Attenuation

State

RF1 - RF2

V1

8 dB

V2

4 dB

V3

2 dB

V4

1 dB

High

High

High

High

Reference

I.L.

High

High

High

Low

1 dB

High

High

Low

High

2 dB

High

Low

High

High

4 dB

Low

High

High

High

8 dB

Low

Low

Low

Low

15 dB

Any combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

012345

6

FREQUENCY (GHz)

1 dB LSB GaAs MMIC 4-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz

v00.0605