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4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
FEATURES:
707
ISO-9001 CERTIFIED BY DSCC
ULTRA-ACCURATE/HIGH SLEW RATE
INVERTING
OPERATIONAL AMPLIFIER
Very Fast Setting Time - 10nS to 0.1% Typical
Very Fast Slew Rate - 4500 V/S Typical
Unity Gain Bandwidth - 220 MHz Typical
Low Noise - 0.15uVrms Typical (f=0.1Hz to 10Hz)
Very Accurate (Low Offset) 75V Max.
Pin Compatable with CLC207 and KH207
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 707 is an inverting composite operational amplifier that combines extremely high bandwidth and slew rate with
excellent D.C. accuracy to produce an amplifier perfectly suited for high performance data aquisition and conversion as well
as high speed commmunication and line drive. The performance of the MSK 707 is guaranteed over the full military tem-
perature range and for more cost sensitive applications is available in an industrial version. The standard package style is a
space efficient 12 pin TO-8. However, alternate package styles are available upon request.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
High Performance Data Aquisition
Coaxial Line Driver
Data Conversion Circuits
High Speed Communications
Ultra High Resolution Video Amplifier
Positive Power Supply
NC
Case Ground
NC
Inverting Input
Non-Inverting Input
1
2
3
4
5
6
Case Ground
Internal Feedback
Negative Power Supply
Negative Short Circuit
Output
Positive Short Circuit
7
8
9
10
11
12
PRELIMINARY Rev. - 2/04
1
EQUIVALENT SCHEMATIC
STATIC
Supply Voltage Range
Quiescent Current
Thermal Resistance
INPUT
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Impedance
Power Supply Rejection Ratio
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
OUTPUT
Output Voltage Swing
Output Current
Settling Time
1
Full Power Bandwidth
Bandwidth (Small Signal)
TRANSFER CHARACTERISTICS
Slew Rate
Supply Voltage
Peak Output Current
Differential Input Voltage
Thermal Resistance
Junction to Case
Output Devices Only
Storage Temperature Range -65C to +150C
Lead Temperature Range
300C
(10 Seconds Soldering)
Power Dissipation See Curve
Junction Temperature 150C
Case Operating Temperature Range
(MSK707H/E) -55C to+125C
(MSK707) -40C to +85C
Group A
Subgroup
-
1
2,3
-
1
2,3
1
2,3
1
2,3
-
-
-
-
-
4
4
-
4
-
-
4
V
mA
mA
C/W
V
V/C
nA
nA
nA
nA
M
V/V
Vp-p
nV
Hz
pA
Hz
V
mA
nS
MHz
MHz
V/S
Vin=0V
Av=-1V/V
Output Devices Junction to Case
Vin=0V Av=-100V/V
Vin=0V
Vcm=0V
Either Input
Vcm=0V
F=DC Differential
Vcc=5V
F= 0.1Hz To 10Hz
F=1KHz
F=1KHz
R
L
=100
Av=-3V/V F
10MHz
T
J
<150C
0.1% 10V step R
L
=1K
R
L
=100
Vo=10V
R
L
=100
V
OUT
=10V R
L
=1K
Av= -1.5V/V
18V
200mA
12V
46C/W
V
CC
I
OUT
V
IN
R
TH
Parameter
T
ST
T
LD
P
D
T
J
T
C
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Test Conditions
NOTES:
AV= -1, measured in false summing junction circuit.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1,4
Subgroup 2
Subgroup 3
Measurement taken 0.5 seconds after application of power using automatic test equipment.
T
A
=T
C
=+25C
T
A
=T
C
=+125C
T
A
=T
C
=-55C
MSK 707H/E
Min.
12
-
-
-
-
-
-
-
-
-
-
-
-
-
-
10
100
-
20
175
Typ.
15
35
36
45
25
0.5
10
15
5
5
5
1
0.15
3.8
0.6
12.5
120
10
22
220
4500
Max.
18
37
39
-
75
1.5
40
80
20
40
-
8
-
-
-
-
-
-
-
-
-
Typ.
15
37
-
48
50
0.75
20
-
10
-
5
2
0.2
4
0.7
12.5
120
15
20
190
MSK 707
Min.
12
-
-
-
-
-
-
-
-
-
-
-
-
-
-
10
100
-
15
165
2500
Max.
18
40
-
-
100
2.0
60
-
30
-
-
20
-
-
-
-
-
-
-
-
-
Units
2
PRELIMINARY Rev. - 2/04
2
Open Loop Voltage Gain R
L
=1K
F=1KHz V
OUT
=10V
3000
4500
100
110
-
95
105
-
dB
2
2
2
2
2
7
2
2
Vcc=15V Unless Otherwise Specified
1
5
7
3
4
2
6
2
2
2
2
2
APPLICATION NOTES
HEAT SINKING
To determine if a heat sink is necessary for your application and
if so, what type, refer to the thermal model and governing equation
below.
Governing Equation:
Example
:
This example demonstrates a worst case analysis for the op-amp
output stage. This occurs when the output voltage is 1/2 the power
supply voltage. Under this condition, maximum power transfer oc-
curs and the output is under maximum stress.
Conditions:
V
CC
=16VDC
V
O
=8Vp Sine Wave, Freq.=1KHz
R
L
=100
For a worst case analysis we will treat the +8Vp sine wave
as an 8VDC output voltage.
1.) Find Driver Power Dissapation
P
D
=(VCC-VO) (VO/RL)
=(16V-8V) (8V/100
)
=0.64W
2.) For conservative design, set T
J
=+125C
3.) For this example, worst case T
A
=+90C
4.) R
JC
=45C/W from MSK 707 Data Sheet
5.) R
CS
=0.15C/W for most thermal greases
6.) Rearrange governing equation to solve for R
SA
R
SA
=((
T
J
-
T
A
)/
P
D
) - (
R
JC
) - (
R
CS
)
=((125C -90C)/0.64W) - 45C/W - 0.15C/W
=54.7 - 46.15
=9.5C/W
PRELIMINARY Rev. - 2/04
3
T
J
=
P
D
x
(R
JC +
R
CS
+
R
JC
)
+
T
A
Where
T
J=
Junction Temperature
P
D=
Total Power Dissipation
R
JC=
Junction to Case Thermal Resistance
R
CS=
Case to Heat Sink Thermal Resistance
R
SA=
Heat Sink to Ambient Thermal Resistance
T
C=
Case Temperature
T
A=
Ambient Temperature
T
S=
Sink Temperature
The value of the short circuit current limit resistors (R
SC
) can
be
calculated as follows.
+R
SC
=V
CC
-0.7/+I
SC
-
R
SC
=V
CC
+0.7/-I
SC
Short circuit current limit should be set at least 2X above the
highest normal operating output current to keep the value of RSC low
enough to ensure that the voltage dropped accross the short circuit
current limit resistor doesn't adversely affect normal operation.
INTERNAL FEEDBACK RESISTOR
The MSK 707 is equipped with an internal 2K
feedback resistor.
Bandwidth and slew rate can be optimized by connecting the MSK
707 as shown in Figure 2. Placing the feedback resistor inside the
hybrid reduces printed circuit board trace length and its' asscociated
capacitance which acts as a capacitive load to the op-amp output.
Reducing the capacitive load allows the output to slew faster and
greater bandwidths will be realized. Refer to Table 1 for recom-
mended RIN values for various gains.
APPROXIMATE
DESIRED GAIN
R
IN
VALUE
1.5K
TABLE 1
Whenever the internal resistor is not being used it is good practice
to short pin 4 and 5 to avoid inadvertently picking up spurious sig-
nals.
APPROXIMATE
DESIRED GAIN
RI(+) RI(-) Rf(Ext) Cf
1 -1 249
499
499
2
1 -2 160
249
499
2
1 -5 169
200
1K
2
1 -8 100
124
1K
2
1 90.9
100
1K
2
-20
-10
1 100
100
2K
2
TABLE 2
1 The positive input resistor is selected to minimize any bias current induced offset
voltage.
2 The feedback capacitor will help compensate for stray input capacitance. The value of
-1
-2
-10
750
150
Thermal Model:
OUTPUT SHORT CIRCUIT PROTECTION
The output section of the MSK 707 can be protected from direct
shorts to ground by placing current limit resistors between pins 1
and 12 and pins 9 and 10 as shown in Figure 1.
Recommended External Component Selection
Guide Using External Rf
this capacitor can be dependent on individual applications. A 0.5 to 5pF capacitor is
usually optimum for most applications.
3 Effective load is RL in parallel with Rf.
APPLICATION NOTES CON'T
STABILITY AND LAYOUT CONSIDERATIONS
As with all wideband devices, proper decoupling of the power
lines is extremely important. The power supplies should be by-passed
as near to pins 9 and 1 as possible with a parallel grouping of a
0.01f ceramic disc and a 4.7f tantalum capacitor. Wideband de-
vices are also sensitive to printed cicuit board layout. Be sure to
keep all runs as short as possible, especially those associated with
the summing junction and power lines. Circuit traces should be sur-
rounded by ground planes whenever possible to reduce unwanted
resistance and inductance. The curve below shows the relationship
between resonant frequency and capacitor value for 3 trace lengths.
FEEDBACK CAPACITANCE
Feedback capacitance is commonly used to compensate for the
"input capacitance" effects of amplifiers. Overshoot and ringing,
especially with capacitive loads, can be reduced or eliminated with
the proper value of feedback capacitance.
All capacitors have a self-resonant frequency. As capacitance in-
creases, self-resonant frequency decreases (assuming all other fac-
tors remain the same). Longer lead lengths and PC traces are other
factors that tend to decrease the self-resonant frequency. When a
feedback capacitor's self-resonant frequency falls within the fre-
quency band for which the amplifier under consideration has gain,
oscillation occurs. These influences place a practical upper limit on
the value of feedback capacitance that can be used. This value is
typically 0.5 to 5pF for the MSK 707.
OPTIMIZING SLEW RATE
When measuring the slew rate of the MSK 707, many external
factors must be taken into consideration to achieve best results. The
closed loop gain of the test fixture should be -1.5V/V or less with
the external feedback resistor being 499
.
Lead length on this resis-
tor must be as short as possible and the resistor should be small. No
short circuit current limit resistors should be used. (Short pin 1 to
pin 12 and pin 9 to pin 10). Pins 2,3,7 and 4 should all be shorted
directly to ground for optimum response. Since the internal feedback
resistor isn't being used, pin 8 should be shorted to pin 5. SMA
connectors are recomended for the input and output connectors to
keep external capacitances to a minimum. To compensate for input
capacitance, a small 0.5 to 5pF high frequency variable capacitor
should be connected in parallel with the feedback resistor. This ca-
pacitor will be adjusted to trim overshoot to a minimum. A 5500V/
S slew rate limit from -10V to +10V translates to a transition time
of 2.9 nanoseconds. In order to obtain a transition time of that mag-
nitude at the output of the test fixture, the transition time of the
input must be much smaller. A rise time at the input of 500 picosec-
onds or less is sufficient. If the transition time of the input is greater
than 500 picoseconds, the following formula should be used, since
the input transition time is now affecting the measured system tran-
sition time.
T
A
=
T
B
+
T
C
WHERE:
T
A
=Transition time measured at output jack on MSK 707 test card.
T
B
=Transition time measured at input jack on MSK 707 test card.
T
C
=Actual output transition time of MSK 707(note that this quantity
will be calculated, not measured directly with the oscilloscope).
THE MSK 707 IS INVERTING, THEREFORE WHEN MEASURING RIS-
ING EDGE SLEW RATE:
T
A
=
Rise time measured at output
T
B
=
Fall time measured at input
T
C
=
Actual rise time of output
WHEN MEASURING FALLING EDGE SLEW RATE:
T
A
=Fall time measured at output
T
B
=Rise time measured at input
T
C
=Actual fall time of output
LOAD CONSIDERATIONS
When determining the load an amplifier will see, the capacitive
portion must be taken into consideration. For an amplifier that slews
at 1000V/S, each pF will require 1mA of output current.
To minimize ringing with highly capacitive loads, reduce the load
time constant by adding shunt resistance.
I=C(dV/dT)
CASE CONNECTION
The MSK 707 has pin 3 and 7 internally connected to the case.
Pin 3 and 7 should be tied to a ground plane for sheilding. For special
applications, consult factory.
4 PRELIMINARY Rev. - 2/04
TYPICAL PERFORMANCE CURVES
PRELIMINARY Rev. - 2/04
5
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