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National Semiconductor Electronic Components Datasheet

LM2485NA Datasheet

220V Triple Bias Clamp with G1 Blank Amplifier

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LM2485NA pdf
December 2004
LM2485
220V Triple Bias Clamp with G1 Blank Amplifier
General Description
The LM2485 is a triple channel clamp amplifier used to DC
restore the AC coupled outputs of a DTV CRT driver and for
cut-off adjustment. The LM2485 also has an integrated
blanking amplifier that can be used to drive the G1 grid of a
CRT negative for vertical retrace blanking. The blanking
output has a selectable pulse amplitude of either 20VP-P or
40VP-P via the Pin 13 option. The blanking input pulse can
be generated from a vertical flyback pulse or by a microcon-
troller.
The LM2485 can operate with a VCC supply of up to 220V
and a VBB supply of either 8V or 12V. This VBB option,
selectable via the Pin 12 option, ensures the LM2485 is
compatible with any National Semiconductor DTV CRT
driver sharing the same operating voltages in the applica-
tion.
The IC is packaged in an industry standard 24-lead molded
plastic dual-in-line package to meet high voltage spacing
requirements.
Features
n VCC capable of up to 220V
n VBB selectable to 8V or 12V via Pin 12 option
n Wide bias output voltage range of over 100V
n Inverted output pulse suitable for G1 blanking,
selectable to 20VP-P or 40VP-P via Pin 13 option
Applications
n AC coupled CRT applications using DTV formats up to
1080i
n Well-matched to the NSC LM12XX Family of
Preamplifiers and LM242X/3X/5X Family of DTV CRT
Drivers
Pinout and Internal Block Diagram
FIGURE 1. Top View
Order Number LM2485NA
See NS Package Number N24C
20103433
© 2004 National Semiconductor Corporation DS201034
www.national.com


National Semiconductor Electronic Components Datasheet

LM2485NA Datasheet

220V Triple Bias Clamp with G1 Blank Amplifier

No Preview Available !

LM2485NA pdf
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
Blanking Input Voltage, VBIN
Storage Temperature Range, TSTG
Lead Temperature (Soldering,
<10sec.)
ESD Tolerance
Human Body Model
Machine Model
250V
15V
-0.5V to +6.5V
-0.5V to +6.5V
-65˚C to +150˚C
300˚C
2 kV
200V
Max Junction Temperature
θJA (Max at 0 LFPM)
150˚C
68˚C/W
Operating Ranges (Note 3)
VCC
VBB (Pin 12 floated)
VBB (Pin 12 grounded)
VIN
VOUT
VBIN
VBOUT (VCC = 220V)
VBOUT (VCC = 180V)
Ambient Temperature Range, TA
170V to 230V
7.5V to 8.5V
11.5V to 12.5V
0V to 5V
105V to 215V
0V to 5V
40V to 80V
25V to 65V
-20˚C to TAMAX
(Note 5)
Electrical Characteristics
(See Figure 2 and Figure 3 for Test Circuits)
Unless otherwise noted: VCC = 220V, VBB = 8V, VIN = 2.5VDC, TA = 20˚C, Pin 12 floated, Pin 13 grounded.
Symbol
Parameter
Conditions
Min Typ Max
ICC
Supply Current
All channels, not including pull-up
3.1 4.2
resistor currents
IBB–8
IBB–12
VOUT
VOUT-Range
Bias Supply Current
Bias Supply Current
Clamp Output Voltage
Clamp Output Voltage
Range
All channels, VBB = 8V
All channels, Pin 12 grounded,
VBB = 12V
VIN-Range= 1.5V to 4.5V
6.0 10.0
9.0 13.0
170 175 180
75
AV Clamp Output DC Voltage 1.0V VIN 5.0V
Gain
–23 –25 –27
LE Clamp Output Linearity (Note 4)
Error
5
VBOUT-High
Blanking Output High
Level
VBIN 0.5V
80
VBOUT-Low1
Blanking Output Low
Level 1
VBIN 4.5V, Pin 13 floated
60
VBOUT-Low2
Blanking Output Low
Level 2
VBIN 4.5V
40
tR
Blanking Output Rise
VBIN = 0V–5V Logic Pulse at 8.6%
Time
duty cycle (480p), VBOUT = 40VP-P
2.0
(40V-80V)
tF Blanking Output Fall Time VBIN = 0V–5V Logic Pulse at 8.6%
duty cycle (480p), VBOUT = 40VP-P
4.5
(40V-80V)
Units
mA
mA
mA
VDC
V
V/V
%
VDC
VDC
VDC
us
us
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
the test conditions, see the Electrical Characteristics. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. 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: Linearity Error is the variation in DC gain from VIN= 1.0V to 5.0V measured at the points 1.0V, 1.5V, 4.5V, and 5.0V.
Note 5: See Section THERMAL CONSIDERATIONS to calculate TAMAX.
www.national.com
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Part Number LM2485NA
Description 220V Triple Bias Clamp with G1 Blank Amplifier
Maker National Semiconductor
Total Page 8 Pages
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