HMC941
v00.0910
0.5 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 30 GHz
Features
0.5 dB LSB Steps to 15.5 dB
Single Positive Control Line Per Bit
±0.5 dB Typical Bit Error
High Input IP3: +45 dBm
Die Size: 2.29 x 0.95 x 0.1 mm
1
ATTENUATORS - DIGITAL - CHIP
Typical Applications
The HMC941 is ideal for:
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar & ECM
• Space Applications
Functional Diagram
General Description
The HMC941 die is a broadband 5-bit GaAs IC digi-
tal attenuator MMIC chip. Covering 0.1 to 30 GHz, the
insertion loss is less than 4 dB typical. The attenuator
bit values are 0.5 (LSB), 1, 2, 4, 8, for a total attenu-
ation of 15.5 dB. Attenuation accuracy is excellent
at less than ± 0.5 dB typical step error with an IIP3 of
+45 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)
0.5 - 7.5 dB States
8 - 15.5 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)
Idd
Iss
0.1 - 30.0 GHz
0.1 - 30.0 GHz
3
-4
0.1 - 30.0 GHz
0.1 - 30.0 GHz
0.1 - 0.5 GHz
0.5 - 30.0 GHz
0.1 - 0.5 GHz
0.5 - 30.0 GHz
0.1 - 30.0 GHz
60
90
5
-6
7
-8
ns
ns
mA
mA
± 0.3 + 4% of Atten. Setting Max
± 0.3 + 5% of Atten. Setting Max
22
27
42
45
dB
dB
dBm
dBm
dBm
dBm
Frequency (GHz)
0.1 - 18.0 GHz
18.0 - 30.0 GHz
0.1 - 30.0 GHz
0.1 - 30.0 GHz
Min.
Typ.
2.5
4.0
15.5
15
Max.
3.5
4.8
Units
dB
dB
dB
dB
1-1
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
HMC941
v00.0910
0.5 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 30 GHz
Normalized Attenuation
0
NORMALIZED ATTENUATION (dB)
Insertion Loss vs. Temperature
0
-1
INSERTION LOSS (dB)
-2
-3
-4
-5
-6
0
5
10
15
20
25
30
35
40
FREQUENCY (GHz)
(Only Major States are Shown)
1
-5
-10
+25 C
+85 C
-55 C
-15
-20
0
5
10
15
20
25
30
35
40
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
FREQUENCY (GHz)
-50
0
5
10
15
20
25
30
35
40
FREQUENCY (GHz)
Bit Error vs. Attenuation State
1
0.8
0.6
BIT ERROR (dB)
Bit Error vs. Frequency
1.5
1
BIT ERROR (dB)
0.5
0
-0.5
-1
-1.5
(Only Major States are Shown)
15.5 dB
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
4
8
12
16
ATTENUATION STATE (dB)
10 GHz
20 GHz
30 GHz
0
5
10
15
20
25
30
35
40
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
1-2
ATTENUATORS - DIGITAL - CHIP
HMC941
v00.0910
0.5 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 30 GHz
Step Attenuation vs. Attenuation State
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
0
4
8
12
16
ATTENUATION STATE (dB)
10 GHz
20 GHz
30 GHz
1
ATTENUATORS - DIGITAL - CHIP
Relative Phase vs. Frequency
(Only Major States are Shown)
60
50
RELATIVE PHASE (deg)
40
30
20
10
0
-10
15.5 dB
0
5
10
15
20
25
30
35
40
FREQUENCY (GHz)
Input IP3 Over Major Attenuation States
60
Input IP3 vs. Temperature
(Minimum Attenuation State)
60
STEP ATTENUATION (dB)
IP3 (dBm)
8 dB
15.5 dB
50
IP3 (dBm)
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
30
26
P0.1dB (dBm)
22
18
14
10
6
0.01
Truth Table
Control Voltage Input
P4
8 dB
High
High
High
High
High
Low
Low
P3
4 dB
High
High
High
High
Low
High
Low
P2
2 dB
High
High
High
Low
High
High
Low
P1
1 dB
High
High
Low
High
High
High
Low
P0
0.5 dB
High
Low
High
High
High
High
Low
Attenuation
State
RF1 - RF2
Reference I.L.
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
0.1
1
FREQUENCY (GHz)
10
100
Any Combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
1-3
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
HMC941
v00.0910
0.5 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 30 GHz
Bias Voltages & Currents
Vdd
Vss
+5V @ 5 mA
-5V @ 6 mA
Absolute Maximum Ratings
RF Input Power (0.5 to 30 GHz)
Control Voltage (P0 to P4)
Vdd
Vss
Channel Temperature
Thermal Resistance
(channel to die bottom)
Storage Temperature
Operating Temperature
+27 dBm
Vdd + 0.5V
+7 Vdc
-7 Vdc
150 °C
146 °C/W
-65 to + 150 °C
-55 to +85 °C
1
Control Voltage
State
Low
High
Bias Condition
0 to 0.8V @ 1 µA
2 to 5V @ 1 µA
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
1. ALL DIMENSIONS ARE IN INCHES (MILLIMETERS).
2. TYPICAL BOND PAD IS .004” 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
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.
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
1-4
ATTENUATORS - DIGITAL - CHIP
HMC941
v00.0910
0.5 dB LSB GaAs MMIC 5-BIT DIGITAL
ATTENUATOR, 0.1 - 30 GHz
1
ATTENUATORS - DIGITAL - CHIP
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
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
1-5
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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