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National Semiconductor Electronic Components Datasheet

LM2479 Datasheet

120V Triple Bias Clamp

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LM2479 pdf
October 2000
LM2479
120V Triple Bias Clamp
General Description
The LM2479 is an Integrated 120V 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.
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
Features
n Wide range integrated triple bias clamp
Block Diagrams
Package Pinout
DS101391-1
FIGURE 1. Simplified Schematic (One Channel)
DS101391-2
FIGURE 2. LM2479 Package Pinout
Order Number LM2479NA
NS Package Number: N08E
© 2000 National Semiconductor Corporation DS101391
www.national.com


National Semiconductor Electronic Components Datasheet

LM2479 Datasheet

120V Triple Bias Clamp

No Preview Available !

LM2479 pdf
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, VCC
Input Voltage, VIN
Storage Temperature Range, TSTG
Lead Temperature (Soldering,
<10sec.)
+130V
0V to 5V
-65˚C to +150˚C
300˚C
ESD Tolerance, Machine Model
200V
Limits of Operating Ranges (Note 3)
VCC
VOUT, VCC = 120V
Ambient Temperature Range, TA
110 to 125
50 to 120V
0 to 70˚C
DC CLAMP ELECTRICAL CHARACTERISTICS TARGETS AND LIMIT
Unless otherwise noted: VCC = +120V, VIN = 2.25VDC, TA = 25˚C.
Symbol
Spec Parameter
Conditions
Min Typ Max Units
ICC
VOUT
VOUT-Range
AV
LE
Supply Current
DC Output Voltage
Output Voltage Range
DC Voltage Gain
Linearity Error
All channels
VIN Range = 1.0V - 4.0V
See Note 1
2.3 3.5 mA
83 87 91 VDC
53 V
-16 -18 -20
5%
RIN Input Resistance
24K
Note 1: Linearity Error is the variation in DC gain from VIN = 1.0V to VIN = 4.0V.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 3: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
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. Test Circuit (One Channel)
DS101391-3
Figure 3 shows the test circuit for evaluation of the LM2479 Clamp Amplifier. A high impedance VM (>100M) is used for DC
measurements at the output.
www.national.com
2


Part Number LM2479
Description 120V Triple Bias Clamp
Maker National Semiconductor
Total Page 4 Pages
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