LM8342SD/NOPB National Semiconductor, LM8342SD/NOPB Datasheet - Page 13

• Manufacturer Part Number: LM8342SD/NOPB
• Description: IC PROG TFT CALIBRATOR 10-LLP
• Manufacturer: National Semiconductor

Specifications of LM8342SD/NOPB

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 10-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM8342SD; LM8342SDTR

The voltage level of the V
(DAC
For calibrating the V
of the design needs to be aligned to the required V
range (ΔV
desired voltage levels.
10
) , is calculated using Equation 4.
COM
FIGURE 9. V
). Figure 9 gives a graphical presentation of the
COM
level (see Figure 8) the tuning range
COM
COM
driver, for a general setting of
Voltage Levels
COM
20139234
tuning
(4)
13
Assume the calibrator needs to cover the voltage range given
in Equation 5.
The limits of V
DAC
Using Equation 5,Equation 6, and Equation 7 the value for
resistors R1 and R2 can be obtained, resulting in Equation
8 and Equation 9:
and
Table 4 gives an overview of resistor values for a typical value
of AV
at V
MID
10
DD
= 127 (low limit) are given by:
= ½ AV
, and 2 R
DD
SET
, and a maximum variation of ΔV
COM
values. All settings are for a V
for DAC
10
= 0 (high limit) and
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COM
COM
.
level
(10)
(5)
(6)
(7)
(8)
(9)