HMC939A Datasheet, PDF (1/6 Pages) Analog Devices – Space Applications

Typical Applications
The HMC939A is ideal for:
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar & ECM
• Space Applications
HMC939A
v01.0916
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Features
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
Functional Diagram
General Description
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.
Electrical Specifications, T_A = +25° C, With Vdd = +5V, Vss = -5V & VCTL = 0/ +5V
Parameter
Frequency (GHz)
Min.
Typ.
Max.
Insertion Loss
0.1 - 18 GHz
18 - 40 GHz
4.3
5.0
7.0
7.8
Attenuation Range
0.1 - 40 GHz
31
Return Loss (RF1, All Atten. States)
(RF2, All Atten. States)
0.1 - 40 GHz
10
0.1 - 40 GHz
12
Attenuation Accuracy: (Referenced to Insertion Loss)
All States
0.1 - 15 dB
16 - 31 dB
Input Power for 0.1 dB Compression
Input Third Order Intercept Point
(Two-Tone Input Power= 8 dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON/tOFF (50% CTL to 10/90% RF)
Idd
Iss
0.1 - 20 GHz
20 - 40 GHz
20 - 40GHz
0.1 - 0.5 GHz
0.5 - 40.0 GHz
0.1 - 0.5 GHz
0.5 - 40.0 GHz
0.1 - 40 GHz
0.1 - 40 GHz
0.1 - 40 GHz
± 0.5 + 3% of Atten. Setting Max
± 0.5 + 5% of Atten. Setting Max
± 0.6 + 6% of Atten. Setting Max
21
24
43
40
50
70
3
5
7
-4
-6
-8
Units
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
ns
ns
mA
mA
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