MICROWAVE CORPORATION
HMC173MS8
General Description
The HMC173MS8 is a miniature absorp-
tive voltage variable attenuator in an 8-
lead MSOP package. The device oper-
ates with a positive supply voltage, and a
positive control voltage. Unique features
include a high dynamic attenuation range,
and excellent power handling performance
through all attenuation states. The
HMC173MS8 is ideal for operation in wire-
less applications between 800 MHz and
1600 MHz. 1.7 to 2.0 GHz operation is
possible, with a reduced maximum attenu-
ation of 30 dB and increased VSWR. The
HMC173MS8 can be used with an exter-
nal driver circuit for improved linearity of
attenuation.
Min
800-1000 MHz
1000-1600 MHz
1600-2000 MHz
800-1000 MHz
1000-1600 MHz
1600-2000 MHz
800-1000 MHz
1000-1600 MHz
800-1000 MHz
1000-1600 MHz
1600-2000 MHz
Min Atten.
Atten.>2.0
Min Atten.
Atten.>2.0
Min Atten.
Atten.>2.0
800-2000 MHz
21
10
30
15
45
27
25
GaAs MMIC VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
F
EBRUARY
2001
Features
SINGLE POSITIVE VOLTAGE CONTROL: 0 to +3V
HIGH ATTENUATION RANGE: >50 dB @ 0.9 GHz
2
SMT A
TTENUATORS
HIGH P1dB COMPRESSION POINT: +16 dBm
ULTRA SMALL PACKAGE: MSOP
Guaranteed Performance
V
dd
= +4.0 Vdc, 50 Ohm System, -40 to +85°C
Parameter
Insertion Loss (Min. Atten.)
(V
CTL
= 0.0 Vdc)
Attenuation Range
(V
CTL
= 0 to +3 V)
Flatness
(Peak to Peak)
Return Loss
(V
CTL
= 0 to +3 V)
Input Power for 0.1 dB Compression
(825 MHz)
Input Power for 1.0 dB Compression
(825 MHz)
Input Third Order Intercept
825 MHz, two tones @ +5.0 dBm
Switching Characteristics
t
RISE
, t
FALL
(10/90% RF)
t
ON
, t
OFF
(50% CTL to 10/90% RF)
Typical
1.8
2.6
3.2
52
32
30
± 0.15
± 0.25
12
8
7
19
9
25
16
37
21
1.0
1.2
Max
2.3
3.1
3.7
Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dBm
µS
µS
6
5
5
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
2 - 26
HMC173MS8
MICROWAVE CORPORATION
HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
F
EBRUARY
2001
Attenuation vs. Control Voltage
@900 and 1900 MHz
0
-10
Input IP3 vs. Control Voltage
@825 MHz
40
825 MHz INPUT IP3 (dBm)
35
30
25
+85C
20
15
10
-40C
ATTENUATION (dB)
-20
1900 MHz
-30
-40
825 MHz
2
SMT A
TTENUATORS
+25C
-50
-60
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE (V)
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE (V)
Attenuation vs. Temperature
Normalized to +25°C @825 MHz
NORMALIZED ATTENUATION (dB)
10
8
6
4
2
0
-2
-4
-6
-8
-10
0
0.5
1
1.5
2
2.5
3
-40C
Input P1dB Compression
@825 MHz
Input Power For 1 dB Compression Point
Test Condition
(825MHz)
Min. Attenuation
Max. Attenuation
V
CTL
(Vdc)
0.0
+3.0
Vdd
(Vdc)
+4.0
+4.0
+25C
26
16.5
+85C
24
15
-40C
25
23
Units
dBm
dBm
+85C
Worst Case
P1dB @
Typical V
CTL
+1.8
+4.0
16.5
15.5
14
dBm
CONTROL VOLTAGE (V)
Broadband Attenuation and
Insertion Loss
0
-10
0
Broadband Return Loss vs.
Control Voltage
0
INSERTION LOSS (dB)
-1
-2
-3
-4
-5
-6
-7
ATTENUATION (dB)
RETURN LOSS (dB)
-20
-30
-40
-50
-60
-70
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-5
0V
-10
2V
2.25V
-15
3V
-20
0.6
0.8
1
1.2
1.4
1.6
1.8
2
FREQUENCY (GHz)
FREQUENCY (GHz)
S - Parameter data is available On-Line at
www.hittite.com
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
2 - 27
MICROWAVE CORPORATION
HMC173MS8
HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
F
EBRUARY
2001
Typical Performance for 800-1000 MHz Applications
Attenuation vs. Control Voltage
825 MHz
Return Loss vs. Control Voltage
825 MHz
0
-2
+85C
-40C
2
SMT A
TTENUATORS
ATTENUATION (dB)
0
-10
-20
-30
-40
-50
-60
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE (V)
+25C
RETURN LOSS (dB)
-4
-6
-8
-10
-12
-14
-16
-18
-20
0
0.5
1
-40C and +85C
+25C
1.5
2
2.5
3
CONTROL VOLTAGE (V)
Typical Performance for 1800-1900 MHz Applications
Attenuation vs. Control Voltage
1900 MHz
0
-5
Return Loss vs. Control Voltage
1900 MHz
0
-2
RETURN LOSS (dB)
ATTENUATION (dB)
-10
-15
-20
-25
-30
-35
0
0.5
1
+25C
-40C
+85C
-4
-6
-8
-10
-12
-14
-16
-18
-20
0
0.5
1
1.5
2
+25C
+85C
-40C
1.5
2
2.5
3
2.5
3
CONTROL VOLTAGE (V)
CONTROL VOLTAGE (V)
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
2 - 28
MICROWAVE CORPORATION
HMC173MS8
F
EBRUARY
2001
HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
Functional Diagram
RF2
GND
V dd
N/C
Control and Bias Voltages
V
CTL
Vdd
0 to +3.0Vdc @ -100
µ
A to +100
µA
+4.0Vdc +/- 0.1Vdc @ +100
µA
2
Absolute Maximum Ratings
PIN 1
RF1
GND
VCTL
N/C
V
CTL
Vdd
-0.2 Vdc to Vdd
+8 Vdc
+29 dBm
+21 dBm
-65 to +150 deg. C
Min Attenuation
Att. > 2 dB
* NOTE: DC blocking capacitors are required for each RF port. Capacitor value
determines lowest frequency of operation.
Maximum Input Power
Vdd = +4.0 Vdc
Storage Temperature
Operating Temperature -40 to +85 deg. C
Outline Drawing
RF2
Gnd
Vdd
N/C
0.116/ 0.120
(2.95/ 3.05)
LOT NUMBER
0.116/ 0.120
(2.95/ 3.05)
HMC
173
Gnd
VCTL
RF1
N/C
0.188/ 0.196
(4.78/ 4.98)
XXXX
YYWW
DATE CODE
YY= YEAR
WW= WEEK
PIN 1 (REF)
PIN 1
0.032/ 0.036
(0.81/ 0.91)
0.038/ 0.042
(0.96/ 1.07)
0.0256 TYP
(0.65)
0 to 5 deg
0.012 TYP
(0.30)
0.005/ 0.007
(0.13/ 0.18)
0.021 MIN TYP
(0.53)
1. MATERIAL:
A) PACKAGE BODY - LOW STRESS INJECTION - MOLDED PLASTIC, SILICA & SILICONE IMPREGNATED.
B) LEADFRAME MATERIAL: COPPER ALLOY
2. PLATING: LEAD - TIN SOLDER PLATE
3. DIMENSIONS ARE IN INCHES (MILLIMETERS), UNLESS OTHERWISE SPECIFIED TOL. ARE ±0.005(±0.13)
4. TAPE AND REEL SHIPMENT PACKAGING AVAILABLE, SEE PAGE 10 - 1
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
2 - 29
SMT A
TTENUATORS
MICROWAVE CORPORATION
HMC173MS8
HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
F
EBRUARY
2001
Attenuation Linearizing Control Circuit For The
HMC173MS8 Voltage Variable Attenuator
A driver circuit to improve the attenuation linearity of the HMC173MS8 can be implemented with a simple op-amp
configuration. A
breakpoint
linearization circuit will scale the voltage supplied to the control line of the HMC173MS8,
so that a more linear attenuation vs. control voltage slope can be achieved. A -5V and +5V supply is required.
2
SMT A
TTENUATORS
Diode and resistor values which define the op-amp gain, and breakpoint were selected to optimize a measured
production lot of attenuators at 825 MHz. R7 may be varied to optimize the performance of any given attenuator. If the
input voltage to the linearizing circuit will not drop below 1.0V, then R9 and D2 may be omitted, and this will greatly reduce
the overall power consumption of the driver circuit.
The linearizing circuit has been optimized for 825 MHz attenuation applications. A similar approach may be used at other
frequencies by adjusting RI - R9 resistor values.
Required Parts List
Part
AD822
R1
R2
R3
R4
R5
R6
R7
R8
R9
D1, D2
Schematic
0
+5V
R6
R5
VCTL IN
R8
0
R7
R1
3
Description
Op-Amp
10K ohms
200K ohms
7.5K ohms
39K ohms
220K ohms
91K ohms
910 ohms
51 ohms
100 ohms
LL4148 D-35
Manufacturer
Analog Devices
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Digikey
+5
-5V
D1
R4
R9
7
U3
6
+
V+
AD820/AD
2 _ V-
4
D2
VCTL OUT
-5V
R2
R3
Return Loss vs. Control Voltage
@ 825 MHz
-12
-13
RETURN LOSS (dB)
Attenuation vs. Control Voltage
@ 825 MHz
0
-10
Without
Linearizer
With
Linearizer
-14
-15
-16
-17
-18
-19
0.5
1
1.5
With
Linearizer
Without
Linearizer
ATTENUATION (dB)
-20
-30
-40
-50
-60
2
2.5
3
0
1
2
3
CONTROL VOLTAGE (Vdc)
CONTROL VOLTAGE (Vdc)
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
2 - 30
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