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PD16647 Arkusz danych(PDF) 9 Page - Renesas Technology Corp

Numer części PD16647
Szczegółowy opis  402/384-OUTPUT TFT-LCD SOURCE DRIVER (64-GRAY SCALES)
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Producent  RENESAS [Renesas Technology Corp]
Strona internetowa  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

PD16647 Arkusz danych(HTML) 9 Page - Renesas Technology Corp

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Data Sheet S13607EJ3V0DS
7
µµµµPD16647
4.1
γγγγ-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.
Figure 4-2.
γγγγ-Corrected Power Circuit
V0
V1
V2
V3
V4
V5
V6
V7
V8
V9
i0
R0
: 1.98 k
Ω = Σ ri
PD16647
i1
i2
i3
i4
i5
i6
i7
i8
i9
µ
-corrected power pin
γ
γ
7
i=1
R1
: 1.72 k
Ω = Σ ri
8
i=1
R2
: 0.86 k
Ω = Σ ri
8
i=1
R3
: 0.99 k
Ω = Σ ri
8
i=1
R4
: 0.73 k
Ω = Σ ri
8
i=1
R5: 0.79 k
Ω = Σ ri
8
i=1
R6
: 1.06 k
Ω = Σ ri
8
i=1
R7
: 1.58 k
Ω = Σ ri
7
i=1
R8
: 6.28 k
Sum of eight
-corrected resistors
-corrected resistor
γ


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