MICROWAVE CORPORATION
9 - 26
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
A
TTENU
A
T
ORS - SMT
9
HMC288MS8
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
v00.0600
General Description
Features
Functional Diagram
2 dB LSB Steps to 14 dB
Single Positive Control Per BIT
Monotonic: 03 dB Bit Error Typical
Miniature MSOP-8 Package, 14.8mm
2
Electrical Specifi cations,
T
A
= +25 C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)
Typical Applications
The HMC288MS8 is a broadband 3-bit positive con-
trol GaAs IC digital attenuator in an 8 lead MSOP
surface mount plastic package. Covering 0.7 to 3.7
GHz, the insertion loss is typically less than 1.2 to
1.8 dB. The attenuator bit values are 2 (LSB), 4,
and 8 dB for a total attenuation of 14 dB. Accuracy
is excellent at 0.3 dB typical with an IIP3 of up to
+51 dBm. Three bit control voltage inputs, toggled
between 0 and +3 to +5V, are used to select each
attenuation state at less than 50 uA each. A single
Vdd bias of +3 to +5V applied through an external
5K Ohm resistor is required while occupying less
than 14.8 mm.
The HMC288MS8 is ideal for:
Cellular
PCS, ISM, MMDS
WLL applications
Parameter
Frequency
Min.
Typical
Max.
Units
Insertion Loss
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
1.0
1.3
1.5
1.7
1.4
1.7
2.0
2.3
dB
dB
dB
dB
Attenuation Range
0.7 - 3.7 GHz
14
dB
Return Loss (RF1 & RF2, All Atten. States)
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
14
11
10
9
17
15
14
12
dB
dB
dB
dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
All Attenuation States
All Attenuation States
All Attenuation States
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
0.3 + 3% of Atten. Setting Max
0.2 + 3% of Atten. Setting Max
0.3 + 3% of Atten. Setting Max
0.3 + 4% of Atten. Setting Max
dB
dB
dB
dB
Input Power for 0.1 dB Compression
5V
3V
0.7 - 3.7 GHz
25
22
dBm
dBm
Input Third Order Intercept Point
(Two-tone Input Power = 0dBm Each Tone)
5V
3V
0.7 - 3.7 GHz
51
47
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
0.7 - 3.7 GHz
560
600
ns
ns
MICROWAVE CORPORATION
9 - 27
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
A
TTENU
A
T
ORS - SMT
9
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
INSERTION LOSS (dB)
FREQUENCY (GHz)
+85 C
-40 C
+25 C
HMC288MS8
Absolute Bit Error
vs. Attenuation State
Return Loss RF1, RF2
(Only Major States are Shown)
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
0
0.3
0.6
0.9
1.2
1.5
2
4
6
8
10
12
14
BIT ERROR (dB)
ATTENUATION STATE (dB)
1.9 GHz
2.4 GHz
0.9 GHz
3.5 GHz
-25
-20
-15
-10
-5
0
0.5
1
1.5
2
2.5
3
3.5
4
RETURN LOSS (dB)
FREQUENCY (GHz)
14 dB
8 dB
4 dB
2 dB
-16
-14
-12
-10
-8
-6
-4
-2
0
0.5
1
1.5
2
2.5
3
3.5
4
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
14 dB
8 dB
4 dB
2 dB
Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.).
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
v00.0600
Absolute Bit Error vs. Frequency
(Only Major States are Shown)
0
0.3
0.6
0.9
1.2
1.5
0.5
1
1.5
2
2.5
3
3.5
4
BIT ERROR (dB)
FREQUENCY (GHz)
14 dB
8 dB
4 dB
2 dB
-20
0
20
40
60
0.5
1
1.5
2
2.5
3
3.5
4
RELATIVE PHASE (deg.)
FREQUENCY (GHz)
14 dB
8 dB
4 dB
2 dB
Relative Phase vs. Frequency
(Only Major States are Shown)
MICROWAVE CORPORATION
9 - 28
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
A
TTENU
A
T
ORS - SMT
9
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
HMC288MS8
v00.0600
Control & Bias Voltages
Truth Table
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 throught either PIN 5 or PIN 8.
Control Voltage Input
Attenuation
Setting
RF1 - RF2
V1
8 dB
V2
4 dB
V3
2 dB
High
High
High
Reference
I.L.
High
High
Low
2 dB
High
Low
High
4 dB
Low
High
High
8 dB
Low
Low
Low
14 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 +0.2V @ 20 uA Max.
High
Vdd 0.2V @ 50 uA Max
Note: Vdd = +3V to 5V 0.2V
MICROWAVE CORPORATION
9 - 29
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
A
TTENU
A
T
ORS - SMT
9
HMC288MS8
v00.0600
Absolute Maximum Ratings
Outline Drawing
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Control Voltage (V1, V2, V3)
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 - 4 GHz)
+28 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 - 30
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
A
TTENU
A
T
ORS - SMT
9
Evaluation Circuit Board
The circuit board used in the fi 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 .
A suffi cient 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
* R2 = R3 = R4 = 100 Ohm.
These resistors are optional
and may be used to enhance
decoupling of the RF path
from the control inputs.
v00.0600
HMC288MS8
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Item Description
J1 - J2
PC Mount SMA Connector
J3 - J6
DC Pin
R1
5k Ohm Resistor, 0402 Chip
R2, R3, R4
100 Ohm Resistor, 0402 Chip
C1, C2
0402 Chip Capacitor, Select for Lowest
Frequency of Operation
U1
HMC288MS8 Digital Attenuator
PCB*
103141 Evaluation PCB 1.5" x 1.5"
*Circuit Board Material: Rogers 4350
PDF 
ZIP