HMC288MS8
/
288MS8E
v01.0705
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Typical Applications
Features
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
6
ATTENUATORS - SMT
The HMC288MS8 / HMC288MS8E is ideal for:
• Cellular
• PCS, ISM, MMDS
• WLL applications
Functional Diagram
General Description
The HMC288MS8 & HMC288MS8E are broadband 3-
bit positive control GaAs IC digital attenuators in 8 lead
MSOP surface mount plastic packages. 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 excel-
lent 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 mm2.
Electrical Specifications,
T
A
= +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)
Parameter
Frequency
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
0.7 - 3.7 GHz
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
14
11
10
9
Min.
Typical
1.0
1.3
1.5
1.7
14
17
15
14
12
Max.
1.4
1.7
2.0
2.3
Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
Insertion Loss
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
Input Third Order Intercept Point
(Two-tone Input Power = 0dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
0.7 - 3.7 GHz
560
600
ns
ns
5V
3V
5V
3V
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
0.7 - 3.7 GHz
0.7 - 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
25
22
51
47
dB
dB
dB
dB
dBm
dBm
dBm
dBm
6 - 34
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
HMC288MS8
/
288MS8E
v01.0705
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Return Loss RF1, RF2
Insertion Loss
0
-0.5
INSERTION LOSS (dB)
(Only Major States are Shown)
0
2 dB
4 dB
8 dB
14 dB
6
ATTENUATORS - SMT
-5
-1.5
-2
-2.5
-3
-3.5
-4
0.5
-25
0.5
+25 C
-40 C
+85 C
RETURN LOSS (dB)
-1
-10
-15
-20
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
(Only Major States are Shown)
0
NORMALIZED ATTENUATION (dB)
-2
Absolute Bit Error
vs. Attenuation State
1.5
1.2
-4
BIT ERROR (dB)
-6
-8
-10
-12
-14
-16
0.5
0
1
1.5
2
2.5
3
3.5
4
2
4
6
8
10
12
14
FREQUENCY (GHz)
ATTENUATION STATE (dB)
2 dB
4 dB
8 dB
14 dB
0.9
0.9 GHz
1.9 GHz
2.4 GHz
3.5 GHz
0.6
0.3
Absolute Bit Error vs. Frequency
(Only Major States are Shown)
1.5
Relative Phase vs. Frequency
(Only Major States are Shown)
60
1.2
BIT ERROR (dB)
2 dB
4 dB
8 dB
14 dB
RELATIVE PHASE (deg.)
40
2 dB
4 dB
8 dB
16 dB
0.9
20
0.6
0
0.3
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 - 35
HMC288MS8
/
288MS8E
v01.0705
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Truth Table
Control & Bias Voltages
V3
2 dB
High
Low
High
High
Low
Attenuation
Setting
RF1 - RF2
Reference
I.L.
2 dB
4 dB
8 dB
14 dB
Max. Atten.
State
Low
High
Bias Condition
0 to +0.2V @ 20 uA Max.
Vdd ± 0.2V @ 50 uA Max
6
ATTENUATORS - SMT
Control Voltage Input
V1
8 dB
High
High
High
Low
Low
V2
4 dB
High
High
Low
High
Low
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 5 or PIN 8.
6 - 36
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
HMC288MS8
/
288MS8E
v01.0705
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Absolute Maximum Ratings
Control Voltage (V1, V2, V3)
Bias Voltage (Vdd)
Storage Temperature
Operating Temperature
RF Input Power (0.7 - 4 GHz)
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
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Package Information
Part Number
HMC288MS8
HMC288MS8E
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
[3]
H288
XXXX
H288
XXXX
[2]
[1] Max peak reflow temperature of 235 °C
[2] Max peak reflow temperature of 260 °C
[3] 4-Digit lot number XXXX
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 - 37
HMC288MS8
/
288MS8E
v01.0705
2 dB LSB GaAs MMIC 3-BIT DIGITAL
ATTENUATOR, 0.7 - 3.7 GHz
Evaluation Circuit Board
6
ATTENUATORS - SMT
* R2 = R3 = R4 = 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 103143
Item
J1 - J2
J3 - J6
R1
R2, R3, R4
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 Fre-
quency of Operation
HMC288MS8 / HMC288MS8E
Digital Attenuator
103141 Evaluation PCB 1.5” x 1.5”
[1]
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 - 38
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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