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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
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HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
v00.1002
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
Typical Applications
The HMC274QS16 is ideal for:
Cellular/PCS/3G Infrastructure
2.4 GHz ISM Radios
Wireless Data
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 inser-
tion 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 Specifi cations,
T
A
= +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
MICROWAVE CORPORATION
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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
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-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
HMC274QS16
Return Loss RF1, RF2
(Only Major States are Shown)
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
-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)
-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)
v00.1002
-35
-30
-25
-20
-15
-10
-5
0
0.5
1
1.5
2
2.5
3
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
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)
-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)
-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)
Relative Phase vs. Frequency
(Only Major States are Shown)
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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
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HMC274QS16
v00.1002
1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
Application Circuit
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 9
or PIN 16.
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
MICROWAVE CORPORATION
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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
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Control Voltages
Truth Table
Absolute Maximum Ratings
Outline Drawing
HMC274QS16
v00.1002
1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
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.
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
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.
MICROWAVE CORPORATION
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
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9
v00.1002
HMC274QS16
1 dB LSB GaAs IC 5-BIT DIGITAL
ATTENUATOR, 0.7 - 2.7 GHz
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.
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.
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