HMC939
v01.0511
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Typical Applications
the hMC939 is ideal for:
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar & ECM
• Space Applications
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: 2.29 x 0.95 x 0.1 mm
AttenuAtors - DigitAl - Chip
Functional Diagram
General Description
The HMC939 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
Insertion Loss
Attenuation Range
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
1.0 - 15 dB States
16 - 31 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)
idd
iss
0.1 - 40 GHz
0.1 - 40 GHz
3
-4
0.1 - 40 GHz
0.1 - 40 GHz
0.1 - 0.5 ghz
0.5 - 40.0 GHz
0.1 - 0.5 ghz
0.5 - 40.0 GHz
0.1 - 40 GHz
60
90
5
-6
7
-8
ns
ns
mA
mA
± 0.5 + 5% of Atten. Setting Max
± 0.6 + 6% of Atten. Setting Max
20
25
40
43
dB
dB
dBm
dBm
dBm
dBm
Frequency (GHz)
0.1 - 18 GHz
18 - 40 GHz
0.1 - 40 GHz
0.1 - 40 GHz
Min.
Typ.
3.5
6.0
31
12
Max.
5.0
7.5
Units
dB
dB
dB
dB
0-1
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC939
v01.0511
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Insertion Loss vs. Temperature
0
-1
INSERTION LOSS (dB)
-2
-3
-4
-5
-6
-7
-8
-9
0
5
10
15
20
25
30
35
40
45
50
FREQUENCY (GHz)
+25 C
+85 C
-55 C
Normalized Attenuation
0
NORMALIZED ATTENUATION (dB)
-5
-10
-15
-20
-25
-30
-35
0
5
10
15
20
25
(Only Major States are Shown)
30
35
40
45
50
FREQUENCY (GHz)
Input Return Loss
0
(Only Major States are Shown)
Output Return Loss
0
(Only Major States are Shown)
-10
RETURN LOSS (dB)
RETURN LOSS (dB)
-10
-20
-20
-30
-30
-40
-40
-50
0
5
10
15
20
25
30
35
40
45
50
FREQUENCY (GHz)
-50
0
5
10
15
20
25
30
35
40
45
50
FREQUENCY (GHz)
Bit Error vs. Attenuation State
2
1.6
1.2
BIT ERROR (dB)
Bit Error vs. Frequency
3
2
31 dB
(Only Major States are Shown)
BIT ERROR (dB)
0.8
0.4
0
-0.4
-0.8
-1.2
-1.6
-2
0
4
8
12
16
20
24
28
32
ATTENUATION STATE (dB)
10 GHz
20 GHz
40 GHz
1
0
-1
-2
-3
0
5
10
15
20
25
30
35
40
45
50
FREQUENCY (GHz)
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
0-2
AttenuAtors - DigitAl - Chip
HMC939
v01.0511
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Relative Phase vs. Frequency
(Only Major States are Shown)
160
140
Step Attenuation vs. Attenuation State
2.4
2
1.6
1.2
0.8
0.4
0
-0.4
0
4
8
12
16
20
24
28
32
ATTENUATION STATE (dB)
10 GHz
20 GHz
40 GHz
AttenuAtors - DigitAl - Chip
RELATIVE PHASE (deg)
120
100
80
60
40
20
0
-20
0
5
10
15
20
25
30
35
40
45
50
31 dB
FREQUENCY (GHz)
Input IP3 Over Major Attenuation States
60
Input IP3 vs. Temperature
(Minimum Attenuation State)
60
50
IP3 (dBm)
IP3 (dBm)
STEP ATTENUATION (dB)
50
40
40
+25 C
+85 C
-40 C
30
30
20
0
5
10
15
20
25
30
35
40
FREQUENCY (GHz)
20
0.1
1
10
100
FREQUENCY (GHz)
Input Power for 0.1 dB Compression
28
24
P0.1dB (dBm)
20
16
12
8
4
0.01
0.1
1
FREQUENCY (GHz)
10
100
0-3
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC939
v01.0511
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Bias Voltages & Currents
Vdd
Vss
+5V @ 5 mA
-5V @ 6 mA
P4
16 dB
High
High
High
High
High
Low
Low
Truth Table
Control Voltage Input
p3
8 dB
High
High
High
High
Low
High
Low
p2
4 dB
High
High
High
Low
High
High
Low
p1
2 dB
High
High
Low
High
High
High
Low
p0
1 dB
High
Low
High
High
High
High
Low
Attenuation
State
RF1 - RF2
Reference I.L.
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
Control Voltage
State
Low
High
Bias Condition
0 to 0.8V @ 1 µA
2 to 5V @ 1 µA
Absolute Maximum Ratings
RF Input Power (0.5 to 40 GHz)
Control Voltage (P0 to P4)
Vdd
Vss
Channel Temperature
Thermal Resistance
(channel to die bottom)
Storage Temperature
Operating Temperature
+25 dBm
Vdd + 0.5V
+7 Vdc
-7 Vdc
150 °C
144
°C/W
-65 to + 150
°C
-55 to +85
°C
Any Combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Die Packaging Information
Standard
WP-9 (Waffle Pack)
[1]
Alternate
[2]
[1] Refer to the “Packaging Information” section for die packaging dimensions.
[2] For alternate packaging information contact Hittite Microwave Corporation.
1. ALL DIMENSIONS ARE IN INCHES (MILLIMETERS).
2. TYPICAL BOND PAD IS .003” SQUARE.
3. TYPICAL BOND PAD SPACING IS .006”
Center to Center eXCept As noteD.
4. BACKSIDE METALIZATION: GOLD
5. BACKSIDE METAL IS GROUND
6. BOND PAD METALIZATION: GOLD
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
0-4
AttenuAtors - DigitAl - Chip
HMC939
v01.0511
1.0 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 40 GHz
Pad Descriptions
Pad Number
Function
gnD
Description
Die bottom must be connected to RF ground.
This pad is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if RF line potential is not equal to 0V.
Interface Schematic
AttenuAtors - DigitAl - Chip
1, 9
RF1, RF2
2
Vss
Negative Bias -5V
3-7
P0 - P4
See truth table and control voltage table.
8
Vdd
Positive Bias +5V
Assembly Diagram
0-5
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
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