LM2480NA
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LM2480
80V Triple Bias Clamp
General Description
The LM2480 driver is an Integrated 80V triple bias clamp
circuit for DC recovery of each of the AC coupled outputs of
a CRT driver. It is well matched with the DAC outputs of the
LM126X family of pre-amplifiers. Each amplifier has its gain
internally set to -18. The IC is packaged in an industry
standard 8 lead molded DIP package.
Features
n Wide range integrated triple bias clamp
n High input impedance
n Single supply operation
n Matched to the LM126X family of preamplifiers
Recommended Applications
n CRT monitors requiring DC restoration at the cathodes
Block Diagrams Package Pinout
20008301
FIGURE 1. Simplified Schematic (One Channel)
20008302
FIGURE 2. LM2480 Package Pinout
Order Number LM2480NA
NS Package Number: N08E
October 2001
LM2480 80V Triple Bias Clamp
© 2001 National Semiconductor Corporation DS200083 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V
CC
+90V
Input Voltage, V
IN
0V to 5V
Storage Temperature Range, T
STG
-65˚C to +150˚C
Lead Temperature (Soldering,
<
10sec.) 300˚C
ESD Tolerance
Machine Model 200V
Human Body Model 2KV
Limits of Operating Ranges (Note 3)
V
CC
70V to 85V
V
OUT
10V to V
CC
Ambient Temperature Range, T
A
0 to 70˚C
DC CLAMP ELECTRICAL CHARACTERISTICS TARGETS AND LIMIT
Unless otherwise noted: V
CC
= +80V, V
IN
= 2.25V
DC
,T
A
= 25˚C.
Symbol Spec Parameter Conditions Min Typ Max Units
I
CC
Supply Current All channels 2.1 3.5 mA
V
OUT
DC Output Voltage 42 46 50 V
DC
V
OUT-Range
Output Voltage Range V
IN
Range = 1.0V - 4.0V 53 V
V
OUTSAT
Max Saturation Limit V
IN
= 4.0V 16 V
DC
A
V
DC Voltage Gain -16 -18 -20
LE Linearity Error See Note 1 5 %
R
IN
Input Resistance 34K Ω
Note 1: Linearity Error is the variation in DC gain from V
IN
= 1.0V to V
IN
= 4.0V.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 3: Operating Ratingsindicateconditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specificationsand
the 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 4: All voltages are measured with respect to GND, unless otherwise specified.
Test Circuit
Figure 3
shows the test circuit for evaluation of the LM2480 Clamp Amplifier. A high impedance VM (
>
100MΩ) is used for DC
measurements at the output.
20008303
FIGURE 3. Test Circuit (One Channel)
LM2480
www.national.com 2
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