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Space Applications
Functional Diagram
General Description
The HMC424 die is a broadband 6-bit GaAs IC
digital attenuator MMIC chip. Covering DC to 13
GHz, the insertion loss is less then 4 dB typical.
The attenuator bit values are 0.5 (LSB), 1, 2, 4,
8, and 16 dB for a total attenuation of 31.5 dB.
Attenuation accuracy is excellent at 鹵 0.5 dB typi-
cal step error with an IIP3 of +32 dBm. Six con-
trol voltage inputs, toggled between 0 and -5V,
are used to select each attenuation state. A single
Vee bias of -5V allows operation at frequencies
down to DC.
Electrical Speci鏗乧ations,
T
A
= +25擄 C, With Vee = -5V & VCTL = 0/-5V
Parameter
Insertion Loss
Attenuation Range
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
0.5 - 7.5 dB States
8 - 31.5 dB States
Input Power for 0.1 dB Compression
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON/tOFF (50% CTL to 10/90% RF)
REF State
All Other States
DC - 13.0 GHz
DC - 13.0 GHz
1.0 - 13.0 Ghz
1.0 - 13.0 Ghz
DC - 13.0 GHz
30
50
ns
ns
鹵 0.3 + 4% of Atten. Setting Max
鹵 0.3 + 6% of Atten. Setting Max
22
46
32
dB
dB
dBm
dBm
dBm
Frequency (GHz)
DC - 8.0 GHz
8.0 - 13.0 GHz
DC - 13.0 GHz
DC - 8.0 GHz
8.0 - 13.0 GHz
8
11
Min.
Typ.
3.0
4.0
31.5
12
15
Max.
3.8
4.6
Units
dB
dB
dB
dB
dB
2-8
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
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