HMC985LP4KE
v01.0813
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 10 - 40 GHz
Typical Applications
the HMC985lP4Ke is ideal for:
Features
Wide Bandwidth: 10 - 40 gHz
excellent linearity: +32 dB Input IP3
Wide attenuation range: 35 dB
no external Matching
24 lead 4x4 mm sMt Package: 16 mm²
attenuators - analog - sMt
•
Point-to-Point radio
•
Vsat radio
•
test Instrumentation
•
Microwave sensors
•
Military, eCM & radar
General Description
the HMC985lP4Ke is an absorptive Voltage Variable
attenuator (VVa) which operates from 10 - 40 gHz and
is ideal in designs where an analog DC control signal
must be used to control rF signal levels over a 35 dB
dynamic range. It features two shunt-type attenuators
which are controlled by two analog voltages, Vctl1 and
Vctl2. optimum linearity performance of the attenuator
is achieved by first varying Vctl1 of the first attenuation
stage from -3V to 0V with Vctl2 fixed at -3V. the control
voltage of the second attenuation stage, Vctl2, should
then be varied from -3V to 0V with Vctl1 fixed at 0V.
if the Vctl1 and Vctl2 pins are connected together it is
possible to achieve the full analog attenuation range
with only a small degradation in input IP3 performance.
applications include agC circuits and temperature
compensation of multiple gain stages in microwave
point-to-point and Vsat radios.
Functional Diagram
Electrical Specifications, T
A
= +25 °C, Test Condition Vctl1 = Vctl2
Parameter
Frequency
10 - 20 gHz
Insertion loss
[1]
20 - 30 gHz
30 -40 gHz
10 - 20 gHz
attenuation range
20 - 30 gHz
30 - 40 gHz
Input return loss
output return loss
Input third order Intercept
(two-tone input Power = 10 dBm each tone)
[2]
[1] Vcntl1 = Vcntl2 =-2.4V
[2] Vcntl1 = Vcntl2 =-2.0V worst case
10 - 40 gHz
10 - 40 gHz
25
30
35
Min.
typ.
3
3
3.5
30
35
40
13
13
33
Max.
3.5
4
4.5
units
dB
dB
dB
dB
dB
dB
dB
dB
dBm
1
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC985LP4KE
v01.0813
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 10 - 40 GHz
Attenuation vs. Frequency over Vctl1 =
Variable, Vctl2 = -3V
0
-5
ATTENUATION (dB)
ATTENUATION (dB)
Attenuation vs. Frequency over Vctl1 =
0V, Vctl2 = Variable
0
-20
-30
-40
-50
-60
-10
-15
-20
-25
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
-70
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
Attenuation vs. Vctl1
Over Temperature @ 25 GHz, Vctl2 = -3V
0
-3
ATTENUATION (dB)
Attenuation vs. Vctl2
Over Temperature @ 30 GHz, Vctl1 = 0V
0
-5
-10
ATTENUATION (dB)
-15
-20
-25
-30
-35
-40
-6
-9
-12
-15
-2.4
-2
-1.6
-1.2
Vctrl1 (V)
-0.8
-0.4
0
-45
-2.4
-2
-1.6
-1.2
Vctrl1 (V)
-0.8
-0.4
0
+25 C
+85 C
-40 C
+25 C
+85 C
-40 C
Attenuation vs. Pin @ 20 GHz over Vctl1
Vctl1 = Variable, Vctl2 = -3V
0
-4
ATTENUATION (dB)
-8
-12
-16
-20
-24
-5
-1
3
7
11
15
INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
Attenuation vs. Pin @ 20 GHz over Vctl2
Vctl2 = Variable, Vctl1 = 0V
0
-10
ATTENUATION (dB)
-20
-30
-40
-50
-5
-1
3
7
11
15
INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
attenuators - analog - sMt
2
-10
HMC985LP4KE
v01.0813
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 10 - 40 GHz
Input Return Loss
Vctl1 = Variable, Vctl2 = -3V
0
Input Return Loss
Vctl1 = 0V, Vctl2 = Variable
0
attenuators - analog - sMt
RETURN LOSS (dB)
-20
RETURN LOSS (dB)
10
15
20
25
30
35
40
-10
-10
-20
-30
-30
-40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
-40
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
Output Return Loss
Vctl1 = Variable, Vctl2 = -3V
0
Output Return Loss
Vctl1 = 0V, Vctl2 = Variable
0
RETURN LOSS (dB)
-20
RETURN LOSS (dB)
10
15
20
25
30
35
40
-10
-10
-20
-30
-30
-40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
-40
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
Input IP3 vs. Input Power @ 20 GHz
Vctl1 = Variable, Vctl2 = -3V
60
Input IP3 vs. Input Power Over Frequency
Vctl1 = -2V, Vctl2 = -3V
[1]
45
50
41
IP3 (dBm)
30
IP3 (dBm)
-5
-1
3
7
11
15
40
37
33
20
29
10
SINGLE TONE INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
25
-5
-3
-1
1
3
5
7
9
11
13
15
SINGLE TONE INPUT POWER (dBm)
10 GHz
20 GHz
30 GHz
[1] Worst Case IP3
3
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC985LP4KE
v01.0813
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 10 - 40 GHz
Input IP3 vs. Input Power Over Temperature
@ 20 GHz, Vctl1 = -2V, Vctl2 = -3V
[1]
45
Input IP3 vs. Input Power @ 20 GHz
Vctl2 = Variable, Vctl1 = 0V
60
41
50
IP3 (dBm)
33
IP3 (dBm)
37
40
30
29
20
25
-5
-3
-1
1
3
5
7
9
11
13
15
SINGLE TONE INPUT POWER (dBm)
+25 C
+85 C
-40 C
10
0
3
6
9
12
15
SINGLE TONE INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0 V
Input IP3 vs. Input Power Over Frequency
Vctl2 = -2V, Vctl1 = 0V
[1]
45
Input IP3 vs Input Power over Tempera-
ture @ 20 GHz, Vctl2 = -2V, Vctl1 = 0V
[1]
45
41
41
33
IP3 (dBm)
IP3 (dBm)
37
37
33
29
29
25
0
3
6
9
12
15
SINGLE TONE INPUT POWER (dBm)
10 GHz
20 GHz
30 GHz
25
0
3
6
9
12
15
SINGLE TONE INPUT POWER (dBm)
+25 C
+85 C
-40 C
[1] Worst Case IP3
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
attenuators - analog - sMt
4
HMC985LP4KE
v01.0813
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 10 - 40 GHz
Attenuation vs Frequency Over Vctrl
Vctl1 = Vctl2
0
Attenuation vs. Vctrl Over Temperature
@ 20 GHz, Vctl1 = Vctl2
0
-5
attenuators - analog - sMt
-10
-10
ATTENUATION (dB)
ATTENUATION (dB)
-20
-30
-40
-50
-40
-60
5
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4 V
-2.0 V
-1.6 V
-1.2 V
-0.8 V
-0.4 V
0.0 V
+25 C
-15
-20
-25
-30
-35
-45
-2.4
-2
-1.6
-1.2
Vctrl1 (V)
-0.8
-0.4
0
+85 C
-40 C
Attenuation vs. Pin @ 20 GHz Over Vctl
Vctl1 = Vctl2
0
-10
Input Return Loss, Vctl1 = Vctl2
0
-20
RETURN LOSS (dB)
-5
-1
3
7
11
15
ATTENUATION (dB)
-10
-20
-30
-40
-30
-50
INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
-40
10
15
20
25
30
35
40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
Output Return Loss, Vctl1 = Vctl2
0
Input IP3 vs. Input Power Over
Vctrl @ 20 GHz, Vctl1 = Vctl2
60
RETURN LOSS (dB)
-10
IP3 (dBm)
10
15
20
25
30
35
40
50
40
-20
30
-30
20
-40
FREQUENCY (GHz)
-2.4 V
-1.2V
0.0 V
10
0
3
6
9
12
15
SINGLE TONE INPUT POWER (dBm)
-2.4V
-2.0V
-1.6V
-1.2V
-0.8V
-0.4V
0.0V
5
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
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