7

TGL6425-SCC

Application Notes :

Suggested Driver Cir cuit

OVERVIEW

DRIVER CIRCUIT

SCHEMATIC

The following is a suggested driver circuit for the TriQuint TGL6425-SSC 0.5 to 18 - Ghz

step attenuator. The circuit allows the user to use a digital binary input to achieve the desir ed level

of attenuation; with a digital wor d of “00000” equaling0 -dB r elative attenuation and “11111”

equaling 15.5- dB r elative attenuation. The JFET s (2N5116 or equivalent) provide the r equired level

shift from TTL voltages to attenuation control levels. The 2 - input NOR gates should be CMOS

(74C02 or equivalent) with 0 V applied to the positive supply terminal and -5 V on the negative

supply terminal.

~ 5kOhms

TriQuint Semiconductor, Inc.

•

Texas Facilities

• (972) 995-8465

• www.triquint.com