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HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
Features
Wide Bandwidth: 5 - 30 GHz Excellent Linearity: +28 dBm Input P1dB Wide Attenuation Range: 30 dB Compact Die Size: 1.4 x 1.2 x 0.1 mm
1
ATTENUATORS - ANALOG - CHIP
Typical Applications
The HMC712 is ideal for: * Point-to-Point Radio * VSAT Radio * Test Instrumentation * Microwave Sensors * Military, ECM & Radar
Functional Diagram
General Description
The HMC712 die is an absorptive Voltage Variable Attenuator (VVA) which operates from 5 - 30 GHz and is ideal in designs where an analog DC control signal must be used to control RF signal levels over a 30 dB amplitude range. It features two shunt-type attenuators which are controlled by two analog voltages, Vctrl1 and Vctrl2. Optimum linearity performance of the attenuator is achieved by first varying Vctrl1 of the 1st attenuation stage from -3V to 0V with Vctrl2 fixed at -3V. The control voltage of the 2nd attenuation stage, Vctrl2, should then be varied from -3V to 0V, with Vctrl1 fixed at 0V. However, if the Vctrl1 and Vctrl2 pins are connected together it is possible to achieve the full analog attenuation range with only a small degradation in input IP3 performance. Applications include AGC circuits and temperature compensation of multiple gain stages in microwave point-to-point and VSAT radios.
Electrical Specifi cations, TA = +25 C, 50 Ohm system
Parameter Insertion Loss Attenuation Range Input Return Loss Output Return Loss Input Power for 1 dB Compression (any attenuation) Input Third Order Intercept (Two-tone Input Power = 10 dBm Each Tone) 5 - 16 GHz 16 - 24 GHz 24 - 30 GHz Min. Typ. 2.5 3.5 4.5 30 12 10 28 32 Max. Units dB dB dB dB dB dB dBm dBm
1 - 20
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
Attenuation vs. Frequency over Vctrl Vctrl1 = Variable, Vctrl2 = -3V
0
Attenuation vs. Frequency over Vctrl Vctrl1 = 0V, Vctrl2 = Variable
0
1
ATTENUATORS - ANALOG - CHIP
1 - 21
-10 ATTENUATION (dB) -5 ATTENUATION (dB)
-20
-30
-3.0 V -1.8 V -1.4 V -0.8 V 0.0 V
-10
-3.0 V -1.8 V -1.4 V -0.8 V 0.0 V
-40
-15 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
-50 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
Attenuation vs. Vctrl1 Over Temperature @ 10 GHz, Vctrl2 = -3V
0
Attenuation vs. Vctrl2 Over Temperature @ 10 GHz, Vctrl1 = 0V
0 -5
-2 ATTENUATION (dB) ATTENUATION (dB) -10 -15 -20 -25 -30 -35 -3 -2.5 -2 -1.5 Vctrl1 (V) -1 -0.5 0 -3 -2.5 -2 -1.5 Vctrl2 (V) -1 -0.5 0
+25 C +85 C -55 C
-4
-6
+25 C +85 C -55 C
-8
-10
Attenuation vs. Pin @ 10 GHz Vctrl1 = Variable, Vctrl2 = -3V
0
-2 ATTENUATION (dB)
-4
-6
-8
-3.0 V -1.8 V -1.2 V
-0.6 V 0.0 V
-10 0 5 10 INPUT POWER (dBm) 15 20
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
1
ATTENUATORS - ANALOG - CHIP
Insertion Phase vs. Vctrl1, Vctrl2 = -3V
180 INSERTION PHASE (degrees) 135 90 45 0 -45 -90 -135 -180 -3
2 GHz 5 GHz 10 GHz 20 GHz 25 GHz
Insertion Phase vs. Vctrl2, Vctrl1 = 0V
180 135 INSERTION PHASE (degrees) 90 45 0 -45 -90 -135 -180 -225
2 GHz 5 GHz 10 GHz 20 GHz 25 GHz
-2.5
-2
-1.5 VCTRL 1
-1
-0.5
0
-3
-2.5
-2
-1.5 VCTRL 2
-1
-0.5
0
Input Return Loss Vctrl1 = Variable, Vctrl2 = -3V
0
Input Return Loss Vctrl1 = 0V, Vctrl2 = Variable
0
-10 RETURN LOSS (dB) RETURN LOSS (dB)
-10
-20
-20
-30
-3.0 V -1.6 V 0.0 V
-30
-40
-3.0 V -1.6 V 0.0 V
-50 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
-40 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
Output Return Loss Vctrl1 = Variable, Vctrl2 = -3V
0
Output Return Loss Vctrl1 = 0V, Vctrl2 = Variable
0
RETURN LOSS (dB)
-10
RETURN LOSS (dB)
-3.0 V -1.6 V 0.0 V
-10
-20
-20
-3.0 V -1.6 V 0.0 V
-30 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
-30 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
1 - 22
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
Input IP3 vs Input Power @ 10 GHz Vctrl1 = Variable, Vctrl2 = -3V
60
Input IP3 vs. Input Power Over Frequency Vctrl1 = -2.2V, Vctrl2 = -3V (Worst Case IP3)
40
1
ATTENUATORS - ANALOG - CHIP
1 - 23
50 35 IP3 (dBm) IP3 (dBm) 40
30
10 GHz 15 GHz 20 GHz 25 GHz
30
-3.0 V -2.4 V -2.2 V -1.8 V 0.0 V
25
20
10 0 5 10 15 20 SINGLE TONE INPUT POWER (dBm)
20 0 5 10 15 20 SINGLE TONE INPUT POWER (dBm)
Input IP3 vs. Input Power Over Temperature @ 10 GHz, Vctrl1 = -2.2V, Vctrl2 = -3V
40
Attenuation vs. Frequency over Vctrl Vctrl1 = Vctrl2
0
-10 35 IP3 (dBm) ATTENUATION (dB)
-20
-30
-3 V -1.8 V -1.4 V -0.8 V 0V
30
+25 C +85 C -55 C
-40
25 0 5 10 15 20 SINGLE TONE INPUT POWER (dBm)
-50 2 9 16 FREQUENCY (GHz) 23 30
Attenuation vs. Vctrl over Temperature @ 10 GHz, Vctrl1 = Vctrl2
0
Attenuation vs. Input Power over Vctrl Vctrl1 = Vctrl2
0
-10 ATTENUATION (dB) ATTENUATION (dB) -10
-20
-20
+25 C +85 C -40 C
-30
-30
-40
-3 V -1.8 V -1.4 V
-.8 V 0V
-40 -3 -2.5 -2 -1.5 -1 -0.5 0 CONTROL VOLTAGE (V)
-50 0 5 10 INPUT POWER (dBm) 15 20
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
1
ATTENUATORS - ANALOG - CHIP
Input Return Loss, Vctrl1 = Vctrl2
0
Output Return Loss, Vctrl1 = Vctrl2
0
RETURN LOSS (dB)
-20
RETURN LOSS (dB)
-10
-10
-20
-30
-3.0 V -1.8 V 0.0 V
-30
-3.0 V -1.8 V 0.0 V
-40 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
-40 2 6 10 14 18 22 26 30 FREQUENCY (GHz)
Input IP3 vs. Input Power Over Vctrl @ 10 GHz, Vctrl1 = Vctrl2
60 50 40 IP3 (dBm) 30 20 10 0 0 5 10 15 20 SINGLE TONE INPUT POWER (dBm)
-2.6 V -2.2 V -1.8 V -1.4 V 0V
Absolute Maximum Ratings
RF Input Power Control Voltage Range Channel Temperature Thermal Resistance (Channel to die bottom) Storage Temperature Operating Temperature +30 dBm +1 to -5V 150 C 64 C/W -65 to +150 C -55 to +85 C
Control Voltages
Vctrl1 Vctrl2 -3 to 0V @ 10 A -3 to 0V @ 10 A
ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS
1 - 24
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
Outline Drawing
1
ATTENUATORS - ANALOG - CHIP
Die Packaging Information [1]
Standard GP-2 (Gel Pack) Alternate [2]
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
[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, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
1 - 25
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
1
ATTENUATORS - ANALOG - CHIP
Pad Descriptions
Pad Number Function Description Interface Schematic
1
RFIN This pad is DC coupled and matched to 50 Ohms. A blocking capacitor is required if RF line potential is not equal to 0V.
2
RFOUT
3
Vctrl2
Control Voltage 2
4
Vctrl1
Control Voltage 1
GND
Die bottom must be connected to RF/DC ground.
Assembly Diagram
1 - 26
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC712
v01.0709
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz
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 brought as close to the die as possible in order to minimize bond wire length. Typical die-to-substrate spacing is 0.076mm to 0.152 mm (3 to 6 mils).
0.102mm (0.004") Thick GaAs MMIC
Wire Bond 0.076mm (0.003")
1
ATTENUATORS - ANALOG - CHIP
1 - 27
RF Ground Plane
0.127mm (0.005") Thick Alumina Thin Film Substrate Figure 1.
Handling Precautions
Follow these precautions to avoid permanent damage. Storage: All bare die are placed in either Waffle or Gel based ESD protective containers, and then sealed in an ESD protective bag for shipment. Once the sealed ESD protective bag has been opened, all die should be stored in a dry nitrogen environment. Cleanliness: Handle the chips in a clean environment. DO NOT attempt to clean the chip using liquid cleaning systems. Static Sensitivity: strikes. Follow ESD precautions to protect against ESD
0.150mm (0.005") Thick Moly Tab 0.254mm (0.010") Thick Alumina Thin Film Substrate Figure 2.
0.102mm (0.004") Thick GaAs MMIC
Wire Bond 0.076mm (0.003")
RF Ground Plane
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 may have 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 C and a tool temperature of 265 C. When hot 90/10 nitrogen/hydrogen gas is applied, tool tip temperature should be 290 C. DO NOT expose the chip to a temperature greater than 320 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 0.025mm (1 mil) diameter pure gold wire. Thermosonic wirebonding with a nominal stage temperature of 150 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 <0.31mm (12 mils).
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

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