ATTENUATORS - DIGITAL - CHIP
1
HMC939A
v01.0916
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Electrical Specications, T
A
= +25° C, With Vdd = +5V, Vss = -5V & VCTL = 0/ +5V
The HMC939A is ideal for:
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar & ECM
• Space Applications
1.0 dB LSB Steps to 31 dB
Single Positive Control Line Per Bit
±1.0 dB Typical Bit Error
High Input IP3: +43 dBm
Die Size: 2.34 x 1.0 x 0.1 mm
The HMC939A die is a broadband 5-bit GaAs IC
digital attenuator MMIC chip. Covering 0.1 to 40 GHz,
the insertion loss is less than 5 dB typical. The
attenuator bit values are 1.0 (LSB), 2, 4, 8, 16 for a
total attenuation of 31 dB. Attenuation accuracy is
excellent at less than ±1.0 dB typical step error with
an IIP3 of +43 dBm. Five control voltage inputs,
toggled between +5V and 0V, are used to select each
attenuation state.
General Description
Features
Functional Diagram
Typical Applications
Parameter Frequency (GHz) Min. Typ. Max. Units
Insertion Loss
0.1 - 18 GHz
18 - 40 GHz
4.3
7.0
5.0
7.8
dB
dB
Attenuation Range 0.1 - 40 GHz 31 dB
Return Loss (RF1, All Atten. States)
(RF2, All Atten. States)
0.1 - 40 GHz
0.1 - 40 GHz
10
12
dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All States
0.1 - 15 dB
16 - 31 dB
0.1 - 20 GHz
20 - 40 GHz
20 - 40GHz
± 0.5 + 3% of Atten. Setting Max
± 0.5 + 5% of Atten. Setting Max
± 0.6 + 6% of Atten. Setting Max
dB
dB
dB
Input Power for 0.1 dB Compression
0.1 - 0.5 GHz
0.5 - 40.0 GHz
21
24
dBm
dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 8 dBm Each Tone)
0.1 - 0.5 GHz
0.5 - 40.0 GHz
43
40
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON/tOFF (50% CTL to 10/90% RF)
0.1 - 40 GHz
50
70
ns
ns
Idd 0.1 - 40 GHz 3 5 7 mA
Iss 0.1 - 40 GHz -4 -6 -8 mA
