ISO 9001 CERTIFIED BY DSCC
HIGH SPEED
POWER AMPLIFIER
111
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
Replaces Apex WA-01
Internal 1.5KΩ Feedback Resistor
High Output Current: 400mA
Very Fast Slew Rate: 3000V/µS
Fast Settling Time
Low Offset Voltage: ±5mV
Offset Null Capability
DESCRIPTION:
The MSK 111 is a high speed operational amplifier which utilizes low impedance push-pull circuitry to achieve high
speed amplification. Laser trimmed offset voltage provides a high DC accuracy typically less than ±2mV. The
MSK 111 also offers an external offset null capability for applications in which zero offset is critical. The speed and
output current offered by the MSK 111 makes it an excellent choice for video processing circuits and high speed test
circuits. The MSK 111 is packaged in a hermetically sealed 8 pin TO-3 package.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
Sample and Hold Circuits
Video Processing
Line Drivers
Function Generators
1
Output
+VCC
NC
Balance
8
7
6
5
Balance
-VCC
+Input
-Input
Rev. B 10/05
7
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage
Output Current
Differential Input Voltage
Common Mode Input Voltage
VCC
IOUT
VIN
VIN
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32V
0.4A
±6V
±VCC
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TST
TLD
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TC
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK111
MSK111H/E
Junction Temperature
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TJ
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-65°C to +150°C
300°C
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-40°C to +85°C
-55°C to +125°C
175°C
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ELECTRICAL SPECIFICATIONS
Group A
Parameter
MSK 111H/E
Test Conditions 1
MSK 111
Units
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max.
-
±12
±15
±16
±12
±15
±16
V
1
-
±28
±30
-
±28
±35
mA
2,3
-
-
±50
-
-
-
mA
1
-
±0.5
±5
-
±0.5
±10
mV
2,3
-
-
±30
-
-
-
mV
STATIC
Supply Voltge Range
2
Quiescent Current
VIN=0V
INPUT
Input Offset Voltage
VIN=0V
2
Input Bias Current
1
-
5
20
-
5
30
µA
VCM=±5V
4
48
54
-
48
54
-
dB
VCC=24V to 30V
1
60
75
-
60
75
-
dB
Output Voltage Swing
f=1KHz RL=1KΩ
4
±10
±11
-
±10
±11
-
V
Output Current
f=1KHz RL=50Ω
4
400
-
-
400
-
-
mA
Power Bandwidth 2
VO=20VPP
-
-
40
-
-
40
-
MHz
Settling Time 2
10V Step
-
-
20
-
-
20
-
nS
VOUT=±10V RL=1KΩ
4
2500
3000
-
-
V/µS
T C =25°C
-
-
2.9
-
-
2.9
-
nS
Junction to Case @ 125°C
-
-
31
-
-
35
-
°C/W
Rf
-
1.497
1.5
1.5
1.505
KΩ
Common Mode Rejection 2
Power Supply Rejection 2
OUTPUT
Slew Rate
Propagation Delay 2
Thermal Resistance 2
Internal Feedback Resistor
1.503 1.495
NOTES:
1 Unless otherwise specified, ±VCC=±15V AV=10V/V and RL=∞ and Tc=25°C.
2 Guaranteed by design but not tested. Typical parameters are representative of actual device
performance but are for reference only.
3 Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
4 Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
5 Subgroup 5 and 6 testing available upon request.
6 Subgroup 1,4 TA=TC=+25°C
Subgroup 2,5 TA=TC=+125°C
Subgroup 3,6
TA=TC=-55°C
7 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
2500 3000
30
Rev. B 10/05
APPLICATION NOTES
POWER SUPPLY BYPASSING
HEAT SINKING
Both the negative and the positive supplies must be
effectively decoupled with a high and low frequency
bypass circuit to avoid power supply induced oscillation. An effective decoupling scheme consists of a 0.01
microfarad ceramic capacitor in parallel with a 4.7 microfarad tantalum capacitor from each power supply pin
to ground. All power supply decoupling capacitors should
be placed as close to the package power supply pins as
possible.
Output, power supply, and bypass leads should be kept
as short as possible. Long connections can add significant inductance, raising impedance and limiting output
current slew rate. This is especially true in the video
frequency range.
The case of the MSK 111 is electrically isolated and
should be connected to a common ground plane. In addition to the case, the input signal and input resistors
should be connected to this common ground plane using a single point grounding scheme. This will help to
prevent undesired current feedback that can cause instability in the circuit.
To select the correct heat sink for your application, refer
to the thermal model and governing equation below.
Governing Equation:
GAIN
TJ = PD x (RθJC + RθCS + RθSA) + TA
The MSK 111, unlike most operational amplifiers, has
an internal feedback resistor. The value of this resistor
is 1.5KΩ. Fewer external components are required to
configure the MSK 111 in either inverting or non-inverting modes. Using an internal feedback resistor shortens
the feedback path, lowering summing node capacitance
to ground and stabilizing high frequency characteristics.
OUTPUT OFFSET NULL
Typically,the MSK 111 has an input offset voltage of
less than ±2mV. The input offset voltage is laser
trimmed to less than ±5mV, but in applications where
offset is critical, the balance pins may be used to null
the offset to zero. A 20KΩ potentiometer may be placed
between pins 4 and 8 with the wiper arm connected to
+VCC. If the balance function is not used pins 4 and 8
should not be connected (floating). However, if settling
time is extremely important, pin 8 should be tied to the
AC ground with a 100-150pF capacitor.
SAFE OPERATING AREA-POWER DISSIPATION
The safe operating area curve is a graphical representation of the power handling capability of the amplifier
under various conditions. The wire bond current carrying capability, transistor junction temperature and secondary breakdown limitations are all incorporated into
the safe operating area curves. All applications should
be checked against the S.O.A. curves to ensure high
M.T.B.F.
Thermal Model:
Where
TJ
PD
RθJC
RθCS
RθSA
TC
TA
TS
=
=
=
=
=
=
=
=
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Case Temperature
Ambient Temperature
Sink Temperature
IN
Example:
In our example the amplifier application requires the output
to drive a 10 volt peak sine wave across a 50 ohm load for
0.2 amp of output current. For a worst case analysis we will
treat the 0.2 amp peak output current as a D.C. output current. The power supplies are ±15 VDC.
1.) Find Power Dissipation
PD=[(quiescent current) x (+VCC - (VCC))] + [(VS - VO) x IOUT]
=(28 mA) x (30V) + (5V) x (0.2A)
=0.84W + 1W
=1.84W
2.) For conservative design, set TJ = +150°C.
3.) For this example, worst case TA = +25°C.
4.) RθJC = 31°C/W
5.) Rearrange governing equation to solve for RθSA:
RθSA = (TJ - TA) / PD - (RθJC) - (RθCS)
= (150°C - 25°C) / 1.84W - (31°C/W) - (0.15°C/W)
= 36°C/W
The heat sink in this example must have a thermal resistance of no more than 36°C/W to maintain a junction temperature of less than +150°C. This calculation assumes a case to
sink thermal resistance of 0.15°C/W.
3
Rev. B 10/05
TYPICAL PERFORMANCE CURVES
4
Rev. B 10/05
MECHANICAL SPECIFICATIONS
CONTAINS INTERNAL BeO (BERYLLIUM OXIDE)
WEIGHT = 15 GRAMS TYPICAL
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part
Number
Screening Level
MSK111
Industrial
MSK111E
EXTENDED RELIABILITY
MSK111H
MIL-PRF-38534 CLASS H
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
5
Rev. B 10/05