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HMC468LP3
1 dB LSB GaAs MMIC 3-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 6.0 GHz
v00.0403
Functional Diagram
Electrical Specifi cations,
T
A
= +25 C, With Vdd = +5V & Vctl = 0/+5V
Typical Applications
The HMC468LP3 is ideal for:
Cellular; UMTS/3G Infrastructure
Fixed Wireless & WLL
Microwave Radio & VSAT
Test Equipment
Features
1 dB LSB Steps to 7 dB
High IP3: +50 dBm
+/- 0.25 dB Typical Bit Error
Single Control Line Per Bit
Single +5V Supply
3 mm x 3 mm x 1 mm SMT Package
General Description
The HMC468LP3 is a broadband 3-bit GaAs IC
digital attenuator in a low cost leadless surface
mount package. Covering DC to 6.0 GHz, the
insertion loss is less than 1 dB typical up to 4
GHz. The attenuator bit values are 1 (LSB), 2 and
4 dB for a total attenuation of 7 dB. Attenuation
accuracy is excellent at 0.4 dB typical step error
with an IIP3 of +50 dBm. Three control voltage
inputs, toggled between 0 and +5V, are used to
select each attenuation state. A single Vdd bias
of +5V is required.
Parameter
Frequency
(GHz)
Min.
Typ.
Max.
Units
Insertion Loss
DC - 2.5 GHz
2.5 - 4.5 GHz
4.5 - 6.0 GHz
0.7
0.9
1.3
1.0
1.3
1.8
dB
dB
dB
Attenuation Range
DC - 6.0 GHz
7
dB
Return Loss (RF1 & RF2, All Atten. States)
DC - 4.0 GHz
4.0 - 6.0 GHz
20
15
dB
dB
Attenuation Accuracy:
(Referenced to Insertion Loss)
All States
1 - 4 dB States
5 - 7 dB States
DC - 2.5 GHz
2.5 - 6.0 GHz
2.5 - 6.0 GHz
0.2 + 2% of Atten. Setting Max.
0.3 + 3% of Atten. Setting Max.
0.4 + 4% of Atten. Setting Max.
dB
dB
dB
Input Power for 0.1 dB Compression
0.25 - 6.0 GHz
20
dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
0.25 - 6.0 GHz
50
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
DC - 6.0 GHz
110
135
ns
ns
* Bypass capacitor connecting ACG1, ACG2 & ACG3 to RF ground required per pin description herein.
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HMC468LP3
Return Loss RF1, RF2
(Only Major States are Shown)
v00.0403
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
Bit Error vs. Frequency
(Only Major States are Shown)
Relative Phase vs. Frequency
(Only Major States are Shown)
Bit Error vs. Attenuation State
1 dB LSB GaAs MMIC 3-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 6.0
-3
-2.5
-2
-1.5
-1
-0.5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
IL
1 dB
2 dB
4 dB
7 dB
RETURN LOSS (dB)
FREQUENCY (GHz)
-10
-8
-6
-4
-2
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
1 dB
2 dB
4 dB
7 dB
NORMALI
ZED ATTENUATI
ON (dB)
FREQUENCY (GHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1
2
3
4
5
6
7
80 MHz
500 MHz
1 GHz
2 GHz
3 GHz
4 GHz
5 GHz
6 GHz
BI
T ERROR (dB)
ATTENUATION STATE (dB)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
1 dB
2 dB
4 dB
7 dB
BI
T ERROR (dB)
FREQUENCY (GHz)
-10
-5
0
5
10
15
20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
1 dB
2 dB
4 dB
7 dB
RELATIVE PHASE (deg)
FREQUENCY (GHz)
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9
HMC468LP3
v00.0403
1 dB LSB GaAs MMIC 3-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 6.0 GHz
Truth Table
TTL/CMOS Control Voltages
State
Bias Condition
Low
0 to 0.8 Vdc @ -5 uA Typ.
High
+2.0 to +5.0 Vdc @ 40 uA Typ.
Control Voltage Input
Attenuation Setting
RF1 - RF2
V1
4 dB
V2
2 dB
V3
1 dB
High
High
High
Reference I.L.
High
High
Low
1 dB
High
Low
High
2 dB
Low
High
High
4 dB
Low
Low
Low
7 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Worst Case Step Error
Between Successive Attenuation States
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
STEP ERROR (dB)
FREQUENCY (GHz)
Bias Voltage & Current
Vdd Range= +5.0 Vdc 10%
Vdd
(Vdc)
Idd (Typ.)
(mA)
Idd (Max.)
(mA)
+5.0
1.05
1.8
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Absolute Maximum Ratings
Outline Drawing
Control Voltage (V1 to V3)
-0.5 Vdc to Vdd +1 Vdc
Bias Voltage (Vdd)
+7.0 Vdc
Staorage Temperature
-65 to +150 C
Operating Temperature
-40 to +85 C
RF Input Power
+30 dBm
NOTES:
1. MATERIAL PACKAGE BODY: LOW STRESS INJECTION MOLDED
PLASTIC SILICA AND SILICON IMPREGNATED.
2. LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY
3. LEAD AND GROUND PADDLE PLATING: Sn/Pb SOLDER
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
6. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
7. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
8. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
HMC468LP3
v00.0403
1 dB LSB GaAs MMIC 3-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 6.0 GHz
MICROWAVE CORPORATION
9 - 108
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
HMC468LP3
v00.0403
1 dB LSB GaAs MMIC 3-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 6.0 GHz
Pin Descriptions
Pin Number
Function
Description
Interface Schematic
1, 3, 4, 8, 9, 10, 12
N/C
These pins should be connected to PCB RF ground to maxi-
mize performance.
2,11
RF1, RF2
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required
13 - 15
V1 - V3
See truth table and control voltage table.
5 - 7
ACG1 - ACG3
External capacitor to ground is required.
Select value for lowest frequency of operation.
Place capacitor as close to pins as possible.
16
Vdd
Supply Voltage
GND
Package bottom has an exposed metal paddle
that must be connected to RF/DC ground.
Application Circuit
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