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HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Typical Applications
Features
0.5 dB LSB Steps to 31.5 dB TTL/CMOS Compatible Serial Data Interface SPI Compatible Serial Output +/- 0.25 dB Typical Step Error Single +5V Supply 4x4 mm SMT Package
6
ATTENUATORS - SMT
The HMC542LP4 / HMC542LP4E is ideal for both RF and IF applications: * Cellular/PCS/3G Infrastructure * ISM, MMDS, WLAN, WiMAX, & WiBro * Microwave Radio & VSAT * Test Equipment and Sensors
Functional Diagram
General Description
The HMC542LP4 & HMC542LP4E are broadband 6-bit GaAs IC digital attenuators with CMOS compatible serial to parallel drivers in low cost leadless surface mount packages. This serial control digital attenuator incorporates off chip AC ground capacitors for near DC operation, making it suitable for a wide variety of RF and IF applications. Covering DC to 3.0 GHz, the insertion loss is less than 1.5 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 0.25 dB typical step error with an IIP3 of +45 dBm. Six bit serial control words are used to select each attenuation state. A single Vdd bias of +5V is required.
Electrical Specifications, TA = +25 C, With Vcc = +5V
Parameter Insertion Loss Attenuation Range Return Loss (RF1 & RF2, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States 0.5 - 3.5 dB States 4.0 - 31.5 dB States All Attenuation States Input Power for 0.1 dB Compression Input Third Order Intercept Point (Two-Tone Input Power= 0 dBm Each Tone) Switching Characteristics DC - 3.0 GHz tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 800 900 ns ns Frequency (GHz) DC - 1.5 GHz 1.5 - 3.0 GHz DC - 3.0 GHz DC - 3.0 GHz Min. Typ. 1.2 1.5 31.5 17 Max. 1.5 1.8 Units dB dB dB dB
DC - 1.0 GHz 1.0 - 2.2 GHz 1.0 - 2.2 GHz 2.2 - 3.0 GHz 0.1 - 3.0 GHz 0.1 - 1.5 GHz 1.5 - 3.0 GHz
(0.20 + 3% of Atten. Setting) Max. (0.25 + 3% of Atten. Setting) Max. (0.15 + 4% of Atten. Setting) Max. (0.30 + 3% of Atten. Setting) Max. 20 35 45
dB dB dB dB dBm dBm dBm
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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
HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Return Loss RF1, RF2
Insertion Loss
0 -0.5 INSERTION LOSS (dB)
(Only Major States are Shown)
0 -5 RETURN LOSS (dB) -10 -15 -20 -25 -30 -35 -40
31.5 dB 0.5-16 dB
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ATTENUATORS - SMT
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-1 -1.5 -2 -2.5 -3 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz)
+25 C +85 C -40 C
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
Normalized Attenuation
(Only Major States are Shown)
0 NORMALIZED ATTENUATION (dB) -5 BIT ERROR (dB) -10 -15 -20 -25 -30 -35 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz)
Bit Error vs. Attenuation State
1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 4 8 12 16 20 24 28 32 ATTENUATION STATE (dB)
2 GHz 100 MHz 40 MHz 3 GHz 1 GHz 500 MHz
Bit Error vs. Frequency
(Only Major States are Shown)
2 1.5 1 BIT ERROR (dB) 0.5 0 -0.5 -1
16 dB 0.5-8B 31.5 dB
Relative Phase vs. Frequency
(Only Major States are Shown)
80 60 RELATIVE PHASE (deg) 40 20 0 -20
0.5-4 dB
31.5 dB 16 dB 8 dB
-1.5 -2 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz)
-40 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz)
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
HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Worst Case Step Error Between Successive Attenuation States
CMOS Control Voltages
State Low High Vcc = +5V 0 to 1.3V 3.5 to 5.0V
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STEP ERROR (dB)
1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.5 1 1.5 2 2.5 3 3.5 4
ATTENUATORS - SMT
Serial Input Truth Table
Latch Enable X X X Shift Clock X Reset L H H Function Shift register cleared Shift register clocked Contents of shift register transferrred to Digital Attenuator
FREQUENCY (GHz)
Timing
Symbol Parameter Min. Serial Input Setup Time Hold time from Serial Input to Shift Clock Setup time from Shift Clock to Latch Enable Propagation delay, Latch Enable to C0.5 through C8 Setup time from Reset to Shift Clock Clock Frequency (1/tclk) ts th tlsup 20 0 40 Max. ns ns ns Vcc = +5V Units
Truth Table
Control Voltage Input C16 High High High High tpd 30 ns High High fclk 20 30 ns MHz Low Low C8 High High High High High Low High Low C4 High High High High Low High High Low C2 High High High Low High High High Low C1 High High Low High High High High Low C0.5 High Low High High High High High Low Attenuation State RF1 - RF2 Reference I.L. 0.5 dB 1 dB 2 dB 4 dB 8 dB 16 dB 31.5 dB
Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.
Timing Diagram
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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
HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Logic / Functional Diagram
6
ATTENUATORS - SMT
Programming Example to Select 16 dB Attenuation State
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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HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Pin Descriptions
6
ATTENUATORS - SMT
Pin Number 1, 3, 5, 12, 14, 16-18, 23
Function N/C
Description These pins should be connected to PCB RF ground to maximize performance.
Interface Schematic
2
Vcc
Supply Voltage.
4, 15
RF1, RF2
This pin is DC coupled and matched to 50 Ohms Blocking capacitors are required. Select value based on lowest frequency of operation. External capacitor to ground is required. Select value for lowest frequency of operation. Place capacitor as close to pins as possible.
6 - 11, 13
ACG1 - ACG7
19
Serial Output
Serial data output. Serial input data delayed by 8 clock cycles
20 21 22
Reset Shift Clock Latch Enable See truth table, control voltage table and timing diagram.
24
Serial Input
GND
Package bottom has an exposed metal paddle that must be connected to RF/DC Ground.
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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
HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Application Circuit
6
ATTENUATORS - SMT
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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HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Bias Voltage
Vcc (Vdc) +4.5 +5.0 +7.0 Vdc 150 C 0.5 W 130 C/W -65 to +150 C -40 to +85 C +5.5 Idd (Typ.) (mA) 4.7 5.0 5.3
Absolute Maximum Ratings
6
ATTENUATORS - SMT
RF Input Power (DC - 3.0 GHz) Digital Inputs (Reset, Shift Clock, Latch Enable & Serial Input) Bias Voltage (Vcc) Channel Temperature Continuous Pdiss (T = 85 C) (derate 7.7 mW/C above 85 C) Thermal Resistance Storage Temperature Operating Temperature
+27 dBm (T = +85 C) -1.5 to (Vcc +1.5V) Vdc
ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS] 3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE. 4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM. PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM. 5. PACKAGE WARP SHALL NOT EXCEED 0.05mm. 6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB RF GROUND. 7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED LAND PATTERN.
Package Information
Part Number HMC542LP4 HMC542LP4E Package Body Material Low Stress Injection Molded Plastic RoHS-compliant Low Stress Injection Molded Plastic Lead Finish Sn/Pb Solder 100% matte Sn MSL Rating MSL1 MSL1
[1]
Package Marking [3] H472 XXXX H472 XXXX
[2]
[1] Max peak reflow temperature of 235 C [2] Max peak reflow temperature of 260 C [3] 4-Digit lot number XXXX
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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
HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Evaluation PCB
6
ATTENUATORS - SMT
List of Materials for Evaluation PCB 114399 [1]
Item J1 - J2 J3 C1 C2, C3 C4 - C7 U1 PCB [2] Description PCB Mount SMA Connector 14 Pin DC Connector 1000 pF Capacitor, 0603 Pkg. 1000 pF Capacitor, 0402 Pkg. 330 pF Capacitor, 0402 Pkg. HMC542LP4 / HMC542LP4E Digital Attenuator 114398 Evaluation PCB
The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 50 ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and bottom ground planes. The evaluation circuit board shown is available from Hittite upon request.
[1] Reference this number when ordering complete evaluation PCB [2] Circuit Board Material: Rogers 4350
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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