HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
Designer’s Kit
Available
Typical Applications
Features
RoHS Compliant Product
4 dB LSB Steps to 12 dB
Single Positive Control Per BIT, 0/+3V
+/-0.2 dB Typical Bit Error
Miniature SOT 26 Package: 9 mm
2
Included in the HMC-DK004 Designer’s Kit
6
ATTENUATORS - SMT
The HMC291 & HMC291E are ideal for:
• Cellular
• PCS, ISM, MMDS
• WLL Handset & Base Station
Functional Diagram
General Description
The HMC291 & HMC291E are general purpose
broadband 2-bit positive control GaAs IC digital
attenuators in 6 lead SOT26 surface mount plastic
packages. Covering 0.7 to 4 GHz, the insertion loss
is typically less than 0.7 to 1.3 dB. The attenuator bit
values are 4 (LSB) and 8 dB for a total attenuation of
12 dB. Accuracy is excellent at ± 0.2 dB typical with an
IIP3 of up to +54 dBm. Two bit control voltage inputs,
toggled between 0 and +3 to +5 volts, are used to
select each attenuation state at less than 50 uA each.
A single Vdd bias of +3 to +5 volts applied through an
external 5K Ohm resistor is required.
Electrical Specifications,
T
A
= +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)
Parameter
Insertion Loss
Frequency
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 4.0 GHz
0.7 - 4.0 GHz
0.7 - 1.4 GHz
1.4 - 4.0 GHz
14
16
Min.
Typical
0.7
0.9
1.0
1.1
12
17
22
Max.
1.0
1.3
1.4
1.6
Units
dB
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
All Attenuation States
Input Power for 0.1 dB Compression
5V
3V
5V
3V
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 4.0 GHz
0.7 - 4.0 GHz
± 0.3 + 3% of Atten. Setting Max
± 0.2 + 2% of Atten. Setting Max
± 0.2 + 3% of Atten. Setting Max
± 0.4 + 5% of Atten. Setting Max
26
22
54
50
dB
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 - 4.0 GHz
0.7 - 4.0 GHz
560
600
ns
ns
6 - 46
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
HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
Insertion Loss
0
Return Loss RF1, RF2
0
-5
6
ATTENUATORS - SMT
4 dB
8 dB
12 dB
INSERTION LOSS (dB)
-0.5
RETURN LOSS (dB)
+25 C
-40 C
+85 C
-10
-15
-20
-25
-30
-35
0.5
-1
-1.5
-2
-2.5
0.5
1
1.5
2
2.5
3
3.5
4
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
FREQUENCY (GHz)
Normalized Attenuation
0
NORMALIZED ATTENUATION (dB)
-2
-4
-6
-8
-10
4 dB
8 dB
12 dB
Absolute Bit Error vs. Attenuation State
1
0.9 GHz
1.9 GHz
2.4 GHz
3.5 GHz
0.8
BIT ERROR (dB)
0.6
0.4
0.2
-12
-14
0.5
0
1
1.5
2
2.5
3
3.5
4
4
6
8
10
12
FREQUENCY (GHz)
ATTENUATION STATE (dB)
Absolute Bit Error vs. Frequency
2
Relative Phase vs. Frequency
60
50
1.5
BIT ERROR (dB)
4 dB
8 dB
12 dB
RELATIVE PHASE (deg.)
40
30
20
10
0
-10
4 dB
8 dB
12 dB
1
0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
-20
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
6 - 47
HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
Control & Bias Voltages
Truth Table
6
ATTENUATORS - SMT
Control Voltage Input
V1
8 dB
High
High
Low
Low
V2
4 dB
High
Low
High
Low
Attenuation
Setting
RF1 - RF2
Reference I.L.
4 dB
8 dB
12 dB
Max. Atten.
State
Low
High
Bias Condition
0 to +0.2V @ 20 uA Max.
Vdd ± 0.2V @ 50 uA Max.
Note: Vdd = +3V to 5V ± 0.2V
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
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 throught either PIN 3 or PIN 1.
6 - 48
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
HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
Absolute Maximum Ratings
Control Voltage (V1, V2)
Bias Voltage (Vdd)
Storage Temperature
Operating Temperature
RF Input Power (0.7 - 4 GHz)
ESD Sensitivity (HBM)
Vdd + 0.5 Vdc
+8.0 Vdc
-65 to +150 °C
6
ATTENUATORS - SMT
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.
-40 to +85 °C
+28 dBm
Class 1A
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Package Information
Part Number
HMC291
HMC291E
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
H291
XXXX
291E
XXXX
[2]
[1] Max peak reflow temperature of 235 °C
[2] Max peak reflow temperature of 260 °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
6 - 49
HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
Evaluation Circuit Board
6
ATTENUATORS - SMT
* R2 = R3 = 100 Ohm.
These resistors are optional
and may be used to enhance
decoupling of the RF path
from the control inputs.
List of Materials for Evaluation PCB 103372
[1]
Item
J1 - J2
J3 - J6
R1
R2, R3
C1, C2
U1
PCB
[2]
Description
PCB Mount SMA Connector
DC Pin
5k Ohm Resistor, 0402 Chip
100 Ohm Resistor, 0402 Chip
0402 Chip Capacitor, Select for Lowest
Frequency of
Operation
HMC291 / HMC291E Digital Attenuator
103370 Evaluation PCB 1.5” x 1.5”
The circuit board used in the final application should
use RF circuit design techniques. Signal lines
should have 50 ohm impedance while the pack-
age ground leads 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 cir-
cuit board as shown is available from Hittite Micro-
wave Corporation upon request.
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
6 - 50
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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