HMC121C8
MICROWAVE CORPORATION
HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz
FEBRUARY 2001
Single-Line Control Driver
V02.0400
50
RF1
50
RF2
2
500 500
500
500
V2 I
+5V
1N4148
O V1
500
CTL
3.9K
500 3.9K
TL321
OR EQUIVALENT
-5V
External op-amp control circuit maintains impedance match while attenuation is varied. Input control ranges
from 0 Volts (min. attenuation) to -2.5 Volts (max. attenuation.)
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343
2 - 18
Fax: 978-250-3373
Web Site: www.hittite.com