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HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Features
1 dB LSB Steps to 31 dB CMOS Compatible Serial Data Interface SPI Compatible Serial Output 0.4 dB Typical Bit Error 24 Lead 4x4mm QFN Package: 16mm2 Included in the HMC-DK004 Designer's Kit
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
The HMC271LP4 / HMC271LP4E is ideal for: * Cellular/3G Infrastructure * Fixed Wireless, WiMax & WiBro * Test Instrumentation
Functional Diagram
General Description
The HMC271LP4 & HMC271LP4E are broadband 5-bit positive control GaAs IC digital attenuators with CMOS compatible serial-to-parallel drivers in low cost leadless QFN 4x4 mm SMT packages. Covering 0.7 to 3.7 GHz, the insertion loss is typically less than 2.5 dB. The attenuator bit values are 1 (LSB), 2, 4, 8, and 16 dB for a total attenuation of 31 dB. Accuracy is excellent at 0.4 dB typical with an IIP3 of up to +48 dBm. Five bit CMOS compatible serial control words are used to select each attenuation state. A single Vcc bias of +3V to +5V applied through an external 5k Ohm resistor is required.
Electrical Specifi cations, TA = +25 C, Vcc = +3V to +5V
Parameter Frequency 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 3.7 GHz 0.7 - 3.7 GHz 0.7 - 1.4 GHz 1.4 - 2.7 GHz 2.7 - 3.7 GHz 0.7 - 0.9 GHz 0.9 - 2.2 GHz 2.2 - 3.7 GHz Vcc = 5V Vcc = 3V Vcc = 5V Vcc = 3V 0.7 - 3.7 GHz 0.7 - 3.7 GHz Min. Typical 1.9 2.3 2.6 2.8 31 12 15 16 (0.4 + 5% of Atten. Setting) Max (0.4 + 4% of Atten. Setting) Max (0.4 + 5% of Atten. Setting) Max 24 22 48 46 Max. 2.4 2.8 3.1 3.3 Units dB dB dB dB dB dB dB dB dB dB dB dBm dBm dBm dBm
Insertion Loss
Attenuation Range Return Loss (RF1 & RF2, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) 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 tRISE, tFALL (10/90% RF) tON, tOFF (Latch Enable to 10/90% RF)
0.7 - 3.7 GHz
750 830
ns ns
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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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Return Loss RF1, RF2 Insertion Loss
0 -0.5 INSERTION LOSS (dB) -1 -1.5 -2 -2.5 -3 -3.5 -4 0.5 -25 1 dB -30 1 1.5 2 2.5 3 3.5 4 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) I.L.
+25C +85C -40C
(Only Major States are Shown)
0 -5 RETURN LOSS (dB) 16 dB -10 -15 -20 2 dB 4 dB 8 dB 31 dB
5
ATTENUATORS - DIGITAL - SMT
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Normalized Attenuation
(Only Major States are Shown)
0 NORMALIZED ATTENUATION (dB) -5
Bit Error vs. Attenuation State
2 1.5 0.9 GHz BIT ERROR (dB) 1 0.5 0 -0.5 3.5 GHz -1 1.9 GHz 2.4 GHz
-10 -15 -20 -25 -30 -35 0.5
1
1.5
2
2.5
3
3.5
4
0
4
8
12
16
20
24
28
32
FREQUENCY (GHz)
ATTENUATION STATE (dB)
Bit Error vs. Frequency
(Only Major States are Shown)
4
Relative Phase vs. Frequency
(Only Major States are Shown)
100 75
3 BIT ERROR (dB) 16 dB 2 8 dB 1, 2, 4 dB
RELATIVE PHASE (deg.)
50 31 dB 25 0 -25 -50 -75 1, 2, 4, 8 dB 16 dB
1
31 dB
0
-1 0.5
-100 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz)
Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.). 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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Worst Case Step Error Between Successive Attenuation States
1.2 0.8 STEP ERROR (dB) 0.4 0 -0.4 -0.8 -1.2 0.5
Digital Control Voltages
State Low High Vcc = +5V 0 to 1.3V 3.5 to 5V Vcc = +3V 0 to 0.7V 2.3 to 3V
Serial Input Truth Table
Latch Enable X X
1 1.5 2 2.5 3 3.5 4
Shift Clock X X
Reset L H H
Function Shift register cleared Shift register clocked Contents of shift register transferred 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 C1 through C16 Setup time from Reset to Shift Clock Clock Frequency (1/tclk) ts th 20 0 Max. Min. 100 5 Max. ns ns Vcc = +5V Vcc = +3V Units
Truth Table
Serial Data Input C1 High Low High tlsup 40 100 ns High High High tpd 30 70 ns Low fclk 20 30 50 10 ns MHz Low Low Low Low C2 High High Low High High High C4 High High High Low High High C8 High High High High Low High C16 High High High High High Low Attenuation Setting RF1 - RF2 Reference I.L. 1 dB 2 dB 4 dB 8 dB 16 dB 31 dB Max. Atten.
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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Logic / Functional Diagram
5
ATTENUATORS - DIGITAL - SMT
Programming Example to Select 1 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
5 - 23
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Pin Descriptions
Pin Number 1, 3, 4, 6, 10, 12, 13, 15, 16, 18 Function N/C Description These pins should be connected to PCB RF ground to maximize performance. This pin is DC coupled and matched to 50 Ohms Blocking capacitors are required. Select value based on lowest frequency of operation. Interface Schematic
2, 17
RF1, RF2
5
Serial Output
Serial data output. Serial input data delayed by 8 clock cycles.
7 8 9
Reset Shift Clock Latch Enable
See truth table, control voltage table and timing diagram.
11
Serial Input
14
Vcc
Supply Voltage. Package bottom has an exposed metal paddle that must also be connected to RF/DC Ground.
19 - 24
GND
5 - 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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Application Circuit
5
ATTENUATORS - DIGITAL - SMT
DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer specifi c frequency to pass with minimal loss. R1 = 5k Ohm is required to supply voltage to the circuit through either PIN 2 or PIN 17.
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
5 - 25
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Absolute Maximum Ratings
Digital Inputs (Reset, Shift Clock, Latch Enable & Serial Input) Digital Outputs (Serial Output) DC Current on Serial Output Bias Voltage (Vcc) Storage Temperature Operating Temperature RF Input Power (0.7 - 3.7 GHz) ESD Sensitivity (HBM) -1.5 to (Vcc + 1.5) V -0.5 to (Vcc + 0.5) V 35 mA +7V -65 to +150 C -40 to +85 C +26 dBm Class 1A
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 HMC271LP4 HMC271LP4E 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] H271 XXXX H271 XXXX
[2]
[1] Max peak reflow temperature of 235 C [2] Max peak reflow temperature of 260 C [3] 4-Digit lot number XXXX
5 - 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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Evaluation Circuit Board
5
ATTENUATORS - DIGITAL - SMT
List of Materials for Evaluation PCB 108782 [1]
Item J1 - J2 J3 C1, C2 C3 R1 U1 PCB [2] Description PCB Mount SMA Connector 2 mm Molex Header 100 pF Capacitor, 0402 Pkg. 0.01 F Capacitor, 0402 Pkg. 5k Ohm Resistor, 0402 Pkg. HMC271LP4 / HMC271LP4E Digital Attenuator 108780 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB [2] Circuit Board Material: Rogers 4350
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 ground paddle should be connected directly to the ground plane similar to that shown below. A sufficient number of via holes should be used to connect the top and bottom ground planes. The evaluation circuit board as shown is available from Hittite Microwave Corporation upon request.
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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