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UPD16647 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD16647
NEC
NEC => Renesas Technology NEC
UPD16647 Datasheet PDF : 16 Pages
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µ PD16647
4.1 γ -Corrected Power Circuit
The reference power supply of the D/A converter consists of a ladder circuit with a total of 64 resistors, and
resistance Σri between γ -corrected power pins differs depending on each pair of γ -corrected power pins. One pair of
γ -corrected power pins consists of seven or eight series resistors, and resistance Σri in the figure below is indicated
as the sum of the seven or eight resistors. The resistance ratio between the γ -corrected power pins (Σri ratio) is
designed to be a value relatively close to the ratio of the γ -corrected voltages V1 through V8 (gray scale voltages in 7
steps) used in an actual LCD panel. Under ideal conditions where there is no difference between the two, therefore,
there is no voltage difference between the voltage of the γ -corrected power supplies and the gray scale voltages in 7
steps of the resistor ladder circuits of the µ PD16647, and no current flows into the γ -corrected power pins V1 through
V8. As a result, a voltage follower circuit is not necessary.
Figure4–2. γ -Corrected Power Circuit
γ -corrected power pin
γ -corrected resister
µ PD16647
V0
i0
7
R0 : 1.98 kΩ = Σ ri
i=1
V1
i1
8
R1 : 1.72 kΩ = Σ ri
V2
i2
i=1
8
Sum of eight
V3
i3
R2 :0.86 kΩ = Σ ri
i=1
γ -corrected resistors
8
R3 : 0.99 kΩ = Σ ri
V4
i4
i=1
8
R4 : 0.73 kΩ = Σ ri
V5
i5
i=1
8
R5 : 0.79 kΩ = Σ ri
V6
i6
i=1
8
R6 :1.06 kΩ = Σ ri
V7
i7
i=1
7
R7 : 1.58 kΩ = Σ ri
V8
i8
i=1
R8 : 6.28 k
V9
i9
Data Sheet S13607EJ2V0DS00
7

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