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MICROWAVE CORPORATION
v02.0404
HMC424
Features
0.5 dB LSB Steps to 31.5 dB Single Control Line Per Bit +/- 0.5 dB Typical Bit Error Die Size: 0.85 mm x 1.45 mm x 0.1 mm
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
Typical Applications
The HMC424 is ideal for:
2
ATTENUATORS - CHIP
* Fiber Optics & Broadband Telecom * Microwave Radio & VSAT * Military Radios, Radar, & ECM * 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 0.5 dB typical step error with an IIP3 of +32 dBm. Six control 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 Specifications, TA = +25 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 0.3 + 4% of Atten. Setting Max 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
MICROWAVE CORPORATION
v02.0404
HMC424
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
GaAs MMIC Insertion Loss
0 -1 -2 INSERTION LOSS (dB) -3 -4 -5 -6 -7 -8 -9 -10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FREQUENCY (GHz) -25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FREQUENCY (GHz)
+25 C +85 C -55 C
SUB-HARMONICALLY (Only Major States are Shown) - 25 GHz PUMPED MIXER 17
0
0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
Return Loss RF1, RF2
-5 RETURN LOSS (dB)
2
ATTENUATORS - CHIP
2-9
-10
-15
-20
Normalized Attenuation
(Only Major States are Shown)
0 NORMALIZED ATTENUATION (dB) -5 -10 BIT ERROR (dB) -15 -20 -25 -30 -35 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FREQUENCY (GHz)
0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
Bit Error vs. Attenuation State
2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 0 4 8 12 16 20 24 28 32 ATTENUATION STATE (dB)
0.1 GHz 4 GHz 8 GHz 13 GHz
Bit Error vs. Frequency
(Only Major States are Shown)
2 1.5 1 BIT ERROR (dB) 0.5 0 -0.5 -1 -1.5 -2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FREQUENCY (GHz)
0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
Relative Phase vs. Frequency
(Only Major States are Shown)
100 80 RELATIVE PHASE (deg) 60 40 20 0 -20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FREQUENCY (GHz)
0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
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
v02.0404
MICROWAVE CORPORATION
HMC424
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
Worst Case Step Error Between Successive Attenuation States
2 1.5 1 STEP ERROR (dB)
Bias Voltage & Current
Vee Range= -5.0 Vdc 10% Vee (Vdc) -5.0 Iee (Typ.) (mA) 2 Iee (Max.) (mA) 4
2
ATTENUATORS - CHIP
0.5 0 -0.5 -1 -1.5 -2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Control Voltage
State Low High Bias Condition 0 to -3V @ 70 A Typ. -5 to -4.2V @ 5 A Typ.
FREQUENCY (GHz)
Truth Table
Control Voltage Input V1 16 dB Low Low Low Low Low Low High High V2 8 dB Low Low Low Low Low High Low High V3 4 dB Low Low Low Low High Low Low High V4 2 dB Low Low Low High Low Low Low High V5 1 dB Low Low High Low Low Low Low High V6 0.5 dB Low High Low Low Low Low Low High Attenuation State RF1 - RF2 Reference I.L. 0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
Absolute Maximum Ratings
Control Voltage (V1 to V6) Bias Voltage (Vee) Channel Temperature Thermal Resistance Storage Temperature Operating Temperature RF Input Power (0.5 - 13.0 GHz) Vee - 0.5 Vdc -7.0 Vdc 150 C 140 C/W -65 to + 150 C -55 to +85 C +25 dBm
Any Combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.
2 - 10
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
MICROWAVE CORPORATION
v02.0404
HMC424
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
Outline Drawing
2
ATTENUATORS - CHIP
Interface Schematic
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
Pad Descriptions
Pad Number Function Description
GND
Die bottom must be connected to RF ground.
1, 3
RF1, RF2
This pad is DC coupled and matched to 50 Ohm. Blocking capacitors are required if RF line potential is not equal to 0V.
2
VEE
Supply Voltage -5V 10%
4, 5, 6, 7, 8, 9
V1 - V6
See truth table and control voltage table.
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
2 - 11
MICROWAVE CORPORATION
v02.0404
HMC424
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
Suggested Driver Circuit (One Circuit Required Per Bit Control Input)
2
ATTENUATORS - CHIP
Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current. * Recommended value to suppress unwanted RF signals at V1 - V6 control lines.
Assembly Diagram
Mounting & Bonding Techniques for Millimeterwave GaAs MMICs
The die should be attached directly to the ground plane eutectically or with conductive epoxy (see HMC general Handling, Mounting, Bonding Note). 50 Ohm Microstrip transmission lines on 0.127mm (5 mil) thick alumina thin film substrates are recommended for bringing RF to and from the chip (Figure 1). If 0.254mm (10 mil) thick alumina thin film substrates must be used, the die should be raised 0.150mm (6 mils) so that the surface of the die is coplanar with the surface of the substrate. One way to accomplish this is to attach the 0.102mm (4 mil) thick die to a 0.150mm (6 mil) thick molybdenum heat spreader (moly-tab) which is then attached to the ground plane (Figure 2). Microstrip substrates should be brought as close to the die as possible in order to minimize bond wire length. Typical die-tosubstrate spacing is 0.076mm to 0.152 mm (3 to 6 mils).
2 - 12
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
MICROWAVE CORPORATION
v02.0404
HMC424
0.5dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 13 GHz
2
ATTENUATORS - CHIP
2 - 13
Handling Precautions
Follow these precautions to avoid permanent damage. Cleanliness: Handle the chips in a clean environment. DO NOT attempt to clean the chip using liquid cleaning systems. Static Sensitivity: Follow ESD precautions to protect against > 250V ESD strikes. Transients: Suppress instrument and bias supply transients while bias is applied. Use shielded signal and bias cables to minimize inductive pick-up. General Handling: Handle the chip along the edges with a vacuum collet or with a sharp pair of bent tweezers. The surface of the chip has fragile air bridges and should not be touched with vacuum collet, tweezers, or fingers.
Mounting
The chip is back-metallized and can be die mounted with AuSn eutectic preforms or with electrically conductive epoxy. The mounting surface should be clean and flat. Eutectic Die Attach: A 80/20 gold tin preform is recommended with a work surface temperature of 255 deg. C and a tool temperature of 265 deg. C. When hot 90/10 nitrogen/hydrogen gas is applied, tool tip temperature should be 290 deg. C. DO NOT expose the chip to a temperature greater than 320 deg. C for more than 20 seconds. No more than 3 seconds of scrubbing should be required for attachment. Epoxy Die Attach: Apply a minimum amount of epoxy to the mounting surface so that a thin epoxy fillet is observed around the perimeter of the chip once it is placed into position. Cure epoxy per the manufacturer's schedule.
Wire Bonding
Ball or wedge bond with 0.025 mm (1 mil) diameter pure gold wire. Thermosonic wirebonding with a nominal stage temperature of 150 deg. C and a ball bonding force of 40 to 50 grams or wedge bonding force of 18 to 22 grams is recommended. Use the minimum level of ultrasonic energy to achieve reliable wirebonds. Wirebonds should be started on the chip and terminated on the package or substrate. All bonds should be as short as possible <0.31 mm (12 mils).
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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