Absolute Maximum Ratings (Notes 1, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
Bias Voltage (VBB)
Input Voltage (VIN)
Storage Temperature Range (TSTG)
0V to 6V
−65˚C to +150˚C
(Soldering, <10 sec.)
ESD Tolerance, Human Body Model
Operating Ranges (Note 2)
+60V to +85V
+8V to +15V
+0V to +5V
+15V to +75V
−20˚C to +100˚C
Do not operate the part without a heat sink.
(See Figure 2 for Test Circuit)
Unless otherwise noted: VCC = +80V, VBB = +12V, CL = 8 pF, TC = 50˚C;
DC Tests: VIN = 2.8 VDC;
AC Tests: Output = 40 VPP (25V–65V) at 1 MHz.
DC Output Voltage
DC Voltage Gain
All Three Channels, No AC Input
Signal, No Output Load
All Three Channels
No AC Input Signal, VIN = 1.35V
No AC Input Signal
(Note 4), No AC Input Signal
(Notes 4, 5), No AC Input Signal
(Note 6), 10% to 90%
(Note 6), 90% to 10%
Min Typical Max
62 65 68
−12 −14 −16
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may
change when the device is not operated under the listed test conditions.
Note 3: All voltages are measured with respect to GND, unless otherwise specified.
Note 4: Calculated value from Voltage Gain test on each channel.
Note 5: Linearity Error is the variation in dc gain from VIN = 1.0V to VIN = 4.6V.
Note 6: Input from signal generator: tr, tf < 1 ns.
AC Test Circuit
Note: 8 pF load includes parasitic capacitance.
FIGURE 2. Test Circuit (One Channel)
Figure 2 shows a typical test circuit for evaluation of the LM2438. This circuit is designed to allow testing of the LM2438 in a 50Ω
environment without the use of an expensive FET probe. The two 2490Ω resistors form a 200:1 divider with the 50Ω resistor and
the oscilloscope. A test point is included for easy use of an oscilloscope probe.The compensation capacitor is used to compen-
sate the stray capacitance of the two 2490Ω resistors to achieve flat frequency response.