LH1684F 查看數據表（PDF） - Sharp Electronics

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LH1684F

5 V Drive 240 Outputs TFT-LCD Source Driver

Sharp Electronics 

LH 1684F

8

(3) Output circuit type

The LH1684F samples video signals by the sample and hold circuits of 2 systems and outputs

the voltage corresponding to the sampled data by the input switching operational amplifiers.

Sample and hold circuits and output circuits are as shown in the diagram below.

When CTR=“H”, the LH1684F samples the data to system A of the sample and hold circuits

and outputs the voltage corresponding to the voltage sampled by capacitor B of system B.

When CTR=“L”, the LH1684F samples the data to system B of the sample and hold circuits

and outputs the voltage corresponding to the voltage sampled by capacitor A of system A.

System A of sample and hold circuits

r---------------------------------.

.1

L_____________---__________________

System B of sampie and hold circuits

Therefore, it is necessary to repeat sampling operation and output operation by exchanging

CTR signal to “H” and “L” for every SP signal, usually.

When CTFI signal is set to “H” or “L” several times for SP signal, the same voltage is output

continuously during such period.

The output voltage corresponds to the data sampled by the previous sampling operation.

Timing of operation is as follows.

SP

CTR

System A

System B

--A

Sampling 1

output 0

4

output 1

Sampling 2

Sampling 3

output 2

I

Sampling 3’

output 2

4

output 3’

Sampling 4

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