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v00.1002
MICROWAVE CORPORATION
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Features
1 dB LSB Steps to 31 dB Single Positive Control (+3 to +5V) Per Bit +/- 0.5 dB Typical Bit Error Small QSOP16 Plastic Package
Typical Applications
The HMC274QS16 is ideal for:
9
ATTENUATORS - SMT
* Cellular/PCS/3G Infrastructure * 2.4 GHz ISM Radios * Wireless Data
Functional Diagram
General Description
The HMC274QS16 is a broadband 5-bit positive control GaAs IC digital attenuator in a 16 lead QSOP plastic package. Covering 0.7 to 2.7 GHz the insertion loss is typically less than 2.3 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 0.5 dB typical with an IIP3 of up to +50 dBm. Five bit control voltage inputs, toggled between 0 and +3 to +5 volts, are used to select each attenuation state. A single Vdd bias of +3 to +5 volts applied through an external 5K Ohm resistor is required.
Electrical Specifications, TA = +25 C, Vdd = +3V to +5V & Vctl = 0/Vdd
Parameter Insertion Loss Frequency 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 0.7 - 2.7 GHz 0.7 - 1.4 GHz 1.4 - 2.7 GHz 10 12 Min. Typical 2.0 2.3 2.5 31 15 17 Max. 2.4 2.7 3.1 Units dB dB dB dB dB dB
Attenuation Range Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States All Attenuation States All Attenuation States Input Power for 0.1 dB Compression Vdd = 5V Vdd = 3V Vdd = 5V Vdd = 3V 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 0.7 - 2.7 GHz 0.35 + 5% of Atten. Setting Max 0.25 + 3% of Atten. Setting Max 0.30 + 5% of Atten. Setting Max 29 20 54 52 dB dB dB dBm dBm dBm dBm
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)
0.7 - 2.7 GHz
0.7 - 2.7 GHz 560 600 ns ns
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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
v00.1002
MICROWAVE CORPORATION
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Return Loss RF1, RF2
Insertion Loss
0 -0.5 -1
INSERTION LOSS (dB)
+25 C +85 C -40 C
(Only Major States are Shown)
0 -5
RETURN LOSS (dB)
I.L. 1 dB 2 dB 4 dB 8 dB 16 dB 31 dB
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ATTENUATORS - SMT
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-1.5 -2 -2.5 -3 -3.5 -4 -4.5 -5 0.5 1 1.5 2 2.5 3
-10 -15 -20 -25 -30 0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
FREQUENCY (GHz)
Normalized Attenuation
(Only Major States are Shown)
0
NORMALIZED ATTENUATION (dB)
Bit Error vs. Attenuation State
1.5 1
BIT ERROR (dB)
-5 -10 -15 -20 -25 -30 -35 0.5
0.5 0 -0.5 -1 -1.5
0.9 GHz 1.9 GHz 2.4 GHz
1
1.5
2
2.5
3
0
4
8
12
16
20
24
28
32
FREQUENCY (GHz)
ATTENUATION STATE (dB)
Bit Error vs. Frequency
(Only Major States are Shown)
2
Relative Phase vs. Frequency
(Only Major States are Shown)
150
1 dB 2 dB 4 dB 8 dB 16 dB 31 dB
1
BIT ERROR (dB)
RELATIVE PHASE (deg)
100
50
0
1 dB 2 dB 4 dB 8 dB 16 dB 31 dB
0
-1
-50
-2 0.5
1
1.5
2
2.5
3
-100 0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
FREQUENCY (GHz)
Note: All Data Typical Over Voltage (+3V to +5V). 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
v00.1002
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Compression Point & IP3
9
ATTENUATORS - SMT
Attenuation State (dB) 1 2 4 1 2 4
Control Voltage (V) 5 5 5 3 3 3
Input P1dB (dBm) +25C 32.3 32.3 32.8 24.8 24.7 26.0 +85C 31.8 31.8 32.1 25.7 24.1 25.6 -40C 32.9 32.8 33.3 25.2 25.1 26.6 +25C 29.4 29.2 29.4 19.7 19.7 19.6
Input P0.1dB (dBm) +85C 28.8 28.6 28.7 18.6 18.3 18.6 -40C 29.8 29.4 29.3 21.1 21.0 21.1 +25C 54.7 52.2 54.1 52.2 52.2 53.1
Input IP3 (dBm) +85C 49.1 49.1 48.65 48.1 48.1 47.65 -40C 52.2 52.2 52.7 52.5 52.2 53.2
Application Circuit
DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer specific frequency to pass with minimal loss. R1 = 5K Ohm is required to supply voltage to the circuit through either PIN 9 or PIN 16.
9 - 22
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
v00.1002
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Truth Table
Control Voltage Input V1 16 dB High High High High High Low Low V2 8 dB High High High High Low High Low V3 4 dB High High High Low High High Low V4 2 dB High High Low High High High Low V5 1 dB High Low 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.
Control Voltages
State Low High Bias Condition 0 to +0.2 V @ 20 uA Max Vdd 0.2V @ 100 uA Max
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ATTENUATORS - SMT
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Note: Vdd = +3V to 5V 0.2V
Absolute Maximum Ratings
Control Voltage (V1 - V5) Bias Voltage (Vdd) Storage Temperature Operating Temperature RF Input Power (0.7 - 2.7 GHz) Vdd + 0.5 Vdc +8.0 Vdc -65 to +150 C -40 to +85 C +30 dBm
Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.
Outline Drawing
NOTES: 1. PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC SILICA AND SILICON IMPREGNATED. 2. LEADFRAME MATERIAL: COPPER ALLOY 3. LEADFRAME PLATING: Sn/Pb SOLDER 4. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE. 6. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE. 7. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
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
v00.1002
MICROWAVE CORPORATION
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Pin Descriptions
9
ATTENUATORS - SMT
Pin Number
Function
Description
Interface Schematic
1, 2, 8, 10 - 15
GND
This pin must be DC grounded.
3-7
V1 - V5
See truth table and control voltage table.
9
RF1
This pin is DC coupled and matched to 50 Ohm. Blocking capacitors are required.
16
RF1
This pin is DC coupled and matched to 50 Ohm. Blocking capacitors are required.
9 - 24
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
v00.1002
MICROWAVE CORPORATION
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL ATTENUATOR, 0.7 - 2.7 GHz
Evaluation PCB
9
ATTENUATORS - SMT
9 - 25
* R2 - R6 = 100 Ohm. These resistors are optional and may be used to enhance decoupling of the RF path from the control inputs.
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 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.
List of Material
Item J1 - J2 J3 - J11 R1 R2 - R6 C1, C2 U1 PCB* Description PC Mount SMA Connector DC Pin 5k Ohm Resistor, 0402 Chip 100 Ohm Resistor, 0402 Chip 0402 Chip Capacitor, Select for Lowest Frequency of Operation HMC274QS16 Digital Attenuator 104931 Evaluation PCB
*Circuit Board Material: Rogers 4350
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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