All electrical specifications are based on the nominal
conditions of Vs1 (Pin 5) and Vs2 (Pin 3) equal to 12.5 Vdc
and with output power equaling 20 watts. With these condi-
tions, maximum current density on any device is 1.5 x 105
A/cm2 and maximum die temperature with 100° base plate
temperature is 165°. While the modules are designed to
have excess gain margin with ruggedness, operation of
these units outside the limits of published specifications is
not recommended unless prior communications regarding in-
tended use has been made with the factory representative.
Gain Control
This module is designed for wide range Pout level control.
The recommended method of power output control, as
shown in Figure 3, is to fix Vs1 and Vs2 at 12.5 Vdc and vary
the input RF drive level at Pin 7.
In all applications, the module output power should be lim-
ited to 20 watts.
passed with a 0.018
µF
chip capacitor effective for frequen-
cies from 5 through 470 MHz. For bypassing frequencies
below 5 MHz, networks equivalent to that shown in the test
fixture schematic are recommended. Inadequate decoupling
will result in spurious outputs at certain operating frequen-
cies and certain phase angles of input and output VSWR less
than 4:1.
Load Mismatch
During final test, each module is load mismatch tested in a
fixture having the identical decoupling network described in
Figure 1. Electrical conditions are Vs1 and Vs2 equal 15.5 V,
load VSWR infinite, and output power equal to 30 watts.
Mounting Considerations
To insure optimum heat transfer from the flange to heat-
sink, use standard 6–32 mounting screws and an adequate
quantity of silicon thermal compound (e.g., Dow Corning
340). With both mounting screws finger tight, alternately
torque down the screws to 4–6 inch pounds. The heatsink
mounting surface directly beneath the module flange should
be flat to within 0.005 inch to prevent fracturing of ceramic
substrate material. For more information on module mount-
ing, see EB–107.
Decoupling
Due to the high gain of the three stages and the module
size limitation, the external decoupling network requires
careful consideration. Both Pins 3 and 5 are internally by-
MHW720A BLOCK DIAGRAM
Pin 7
Z1
Pin 6 Pin 5
Pin 4
C2
Pin 3
Pin 2
Pin 1
Z2
10 dB
L1
C1
L2
C3
C4
Vs2
C6
C7
50
Ohm
Load
MHW720A Text Fixture Schematic
C2, C3 0.1
µF
Ceramic
C7 47
µF
Tantalum, 25 V
C5
Vs1
MICROLAB/ FXR AD 10N
Signal
Generator
Z1, Z2 50
Ω
Microstripline
L1, L2 Ferroxcube VK200–20/4B
C1, C4, C5, C6 1.0
µF
Tantalum 25 V
NOTE: No Internal D.C. blocking on input pin.
Figure 1. UHF Power Amplifier Test Setup
MHW720A1 MHW720A2
2
MOTOROLA RF DEVICE DATA
TYPICAL CHARACTERISTICS
MHW720A1, MHW720A2
η,
EFFICIENCY (%)
160
25
Pout , OUTPUT POWER (WATTS)
20
η
50
45
Pin, INPUT POWER (mW)
120
Pout = 20 W
Vs1 = Vs2 = 12.5 V
80
Pin
40
VSWR
0
390
410
430
450
f, FREQUENCY (MHz)
470
40
35
f = 400 MHz
440 MHz
470 MHz
15
10
5.0
0
0
20
Vs1 = Vs2 = 12.5 V
2.0:1
1.5:1
1.0:1
490
INPUT VSWR
40
60
f, FREQUENCY (MHz)
80
100
Figure 2. Input Power, Efficiency, and
VSWR versus Frequency
Figure 3. Output Power versus Input Power
25
Pout , OUTPUT POWER (WATTS)
20
Pin Set for Pout = 20 W
@ Vs1 = Vs2 = 12.5 Vdc
160
Pin, INPUT POWER (mW)
120
f = 470 MHz
80
440 MHz
400 MHz
40
Pout = 20 W
Vs1 = Vs2 = 12.5 V
15
f = 400 MHz
10
470 MHz
5.0
5.0
6.0
7.0
8.0
9.0 10
11
12
13
Vs1, Vs2, SUPPLY VOLTAGE (Vdc)
14
15
0
–40
–20
0
+20 +40 +60 +80 +100 +120
TC, CASE TEMPERATURE (°C)
Figure 4. Output Power versus Voltage
Figure 5. Input Power versus
Case Temperature
20
Pout , OUTPUT POWER (WATTS)
f = 400 MHz
15
440 MHz
470 MHz
10
Vs1 = Vs2 = 10.8 V
Pin = 100 mW (Fixed)
5.0
–40
–20
0
+20
+40
+60
+80
+100 +120
TC, CASE TEMPERATURE (°C)
Figure 6. Output Power versus Case
Temperature @ 10.8 V Supply
MOTOROLA RF DEVICE DATA
MHW720A1 MHW720A2
3
PACKAGE DIMENSIONS
G
Q
J
R
K
X
W
V
U
N
L
H
–A–
B
E
C
–T–
SEATING
PLANE
2 PL
0.13 (0.005)
M
S
M
A
M
T
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
INCHES
MIN
MAX
2.640
2.660
2.040
2.085
0.335
0.360
0.100
0.115
0.085
0.115
2.405 BSC
1.885
1.915
0.400
0.440
0.230
0.300
1.785
1.815
1.585
1.615
0.136
0.146
0.800
0.820
0.670
0.690
0.485
0.515
0.385
0.415
0.185
0.215
0.085
0.115
MILLIMETERS
MIN
MAX
67.06
67.56
51.82
52.95
8.51
9.14
2.54
2.92
2.16
2.92
61.09 BSC
47.88
48.64
10.16
11.18
5.85
7.62
45.34
46.10
40.26
41.02
3.46
3.70
20.32
20.82
17.02
17.52
12.32
13.08
9.78
10.54
4.70
5.46
2.16
2.92
–S–
DIM
A
B
C
E
F
G
H
J
K
L
N
Q
R
S
U
V
W
X
STYLE 2:
PIN 1.
2.
3.
4.
5.
6.
7.
F
RF OUTPUT
GROUND
Vs2
GROUND
Vs1
GROUND
RF INPUT
CASE 700–04
ISSUE F
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
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