ATTENUATORS - SMT
5
5 - 28
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
HMC274QS16 / 274QS16E
1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
v01.0505
General Description
Features
Functional Diagram
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
Included in the HMC-DK004 Designer’s Kit
Typical Applications
The HMC274QS16 / HMC274QS16E is ideal for:
• Cellular/PCS/3G Infrastructure
• 2.4 GHz ISM Radios
• Wireless Data
The HMC274QS16 & HMC274QS16E are broadband
5-bit positive control GaAs IC digital attenuators in
16 lead QSOP plastic packages. 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 Speci cations, TA = +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd
Parameter Frequency Min. Typical Max. Units
Insertion Loss
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.0
2.3
2.5
2.4
2.7
3.1
dB
dB
dB
Attenuation Range 0.7 - 2.7 GHz 31 dB
Return Loss (RF1 & RF2, All Atten. States) 0.7 - 1.4 GHz
1.4 - 2.7 GHz
10
12
15
17
dB
dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
All Attenuation States
All Attenuation States
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
± 0.35 + 5% of Atten. Setting Max
± 0.25 + 3% of Atten. Setting Max
± 0.30 + 5% of Atten. Setting Max
dB
dB
dB
Input Power for 0.1 dB Compression Vdd = 5V
Vdd = 3V 0.7 - 2.7 GHz 29
20
dBm
dBm
Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)
Vdd = 5V
Vdd = 3V 0.7 - 2.7 GHz 54
52
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
0.7 - 2.7 GHz 560
600
ns
ns
ATTENUATORS - SMT
5
5 - 29
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
HMC274QS16 / 274QS16E
Return Loss RF1, RF2
(Only Major States are Shown)
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
v01.0505 1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
Note: All Data Typical Over Voltage (+3V to +5V).
Bit Error vs. Attenuation State
Bit Error vs. Frequency
(Only Major States are Shown)
Relative Phase vs. Frequency
(Only Major States are Shown)
-5
-4
-3
-2
-1
0
0.5 1 1.5 2 2.5 3
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-1.5
-1
-0.5
0
0.5
1
1.5
0 4 8 12 16 20 24 28 32
0.9 GHz
1.9 GHz
2.4 GHz
BIT ERROR (dB)
ATTENUATION STATE (dB)
-35
-30
-25
-20
-15
-10
-5
0
0.5 1 1.5 2 2.5 3
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-100
-50
0
50
100
150
0.5 1 1.5 2 2.5 3
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
RELATIVE PHASE (deg)
FREQUENCY (GHz)
-2
-1
0
1
2
0.5 1 1.5 2 2.5 3
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
BIT ERROR (dB)
FREQUENCY (GHz)
-30
-25
-20
-15
-10
-5
0
0.5 1 1.5 2 2.5 3
I.L.
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
RETURN LOSS (dB)
FREQUENCY (GHz)
ATTENUATORS - SMT
5
5 - 30
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
Truth Table
Application Circuit
DC blocking capacitors C1 & C2 are
required on RF1 & RF2. Choose C1 = C2
= 100 ~ 300 pF to allow lowest customer
speci c frequency to pass with minimal
loss. R1 = 5K Ohm is required to supply
voltage to the circuit through either PIN 9
or PIN 16.
Control Voltage Input Attenuation
Setting
RF1 - RF2
V1
16 dB
V2
8 dB
V3
4 dB
V4
2 dB
V5
1 dB
High High High High High Reference I.L.
High High High High Low 1 dB
High High High Low High 2 dB
High High Low High High 4 dB
High Low High High High 8 dB
Low High High High High 16 dB
Low Low Low Low Low 31 dB Max. Atten.
Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.
Compression Point & IP3
Attenuation
State (dB)
Control
Voltage (V)
Input P1dB (dBm) Input P0.1dB (dBm) Input IP3 (dBm)
+25C +85C -40C +25C +85C -40C +25C +85C -40C
1 5 32.3 31.8 32.9 29.4 28.8 29.8 54.7 49.1 52.2
2 5 32.3 31.8 32.8 29.2 28.6 29.4 52.2 49.1 52.2
4 5 32.8 32.1 33.3 29.4 28.7 29.3 54.1 48.65 52.7
1 3 24.8 25.7 25.2 19.7 18.6 21.1 52.2 48.1 52.5
2 3 24.7 24.1 25.1 19.7 18.3 21.0 52.2 48.1 52.2
4 3 26.0 25.6 26.6 19.6 18.6 21.1 53.1 47.65 53.2
HMC274QS16 / 274QS16E
v01.0505 1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
ATTENUATORS - SMT
5
5 - 31
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
Control Voltages
Absolute Maximum Ratings
Outline Drawing
State Bias Condition
Low 0 to +0.2 V @ 20 uA Max
High Vdd ± 0.2V @ 100 uA Max
Note: Vdd = +3V to 5V ± 0.2V
Control Voltage (V1 - V5) Vdd + 0.5 Vdc
Bias Voltage (Vdd) +8.0 Vdc
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
RF Input Power (0.7 - 2.7 GHz) +30 dBm
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]
HMC274QS16 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] HMC274
XXXX
HMC274QS16E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] HMC274
XXXX
[1] Max peak re ow temperature of 235 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX
Package Information
HMC274QS16 / 274QS16E
v01.0505 1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS].
3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE.
4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE.
5. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
ATTENUATORS - SMT
5
5 - 32
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
Pin Descriptions
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.
9RF1
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.
HMC274QS16 / 274QS16E
v01.0505 1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
ATTENUATORS - SMT
5
5 - 33
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
Evaluation PCB
The circuit board used in the nal 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 Materials for Evaluation PCB 104976 [1]
* R2 - R6 = 100 Ohm.
These resistors are optional
and may be used to enhance
decoupling of the RF path
from the control inputs.
Item Description
J1 - J2 PCB Mount SMA Connector
J3 - J11 DC Pin
R1 5k Ohm Resistor, 0402 Chip
R2 - R6 100 Ohm Resistor, 0402 Chip
C1, C2 0402 Chip Capacitor, Select for Lowest
Frequency of Operation
U1 HMC274QS16 / HMC274QS16E
Digital Attenuator
PCB [2] 104931 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
HMC274QS16 / 274QS16E
v01.0505 1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
