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

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HMC792LP4E

v00.0609

0.25 dB LSB GaAs MMIC 6-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Serial Control Interface

The HMC792LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface

is activated when P/S is kept high. The 6-bit serial word must be loaded MSB first. The positive-edge sensitive CLK

and LE requires clean transitions. If mechanical switches are used, sufficient debouncing should be provided. When

LE is high, 6-bit data in the serial input register is transferred to the attenuator. When LE is high CLK is masked to

prevent data transition during output loading.

When P/S is low, 3-wire SPI interface inputs (SERIN, CLK, LE) are disabled and the input register is loaded with

parallel digital inputs (D0-D5). When LE is high, 6-bit parallel data changes the state of the part per truth table.

For all modes of operations, the attenuation state will stay constant while LE is kept low.