HT82V38 データシートの表示（PDF） - Holtek Semiconductor

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HT82V38

16-Bit CCD/CIS Analog Signal Processor

Holtek Semiconductor 

HT82V38

MUX Register

The MUX Register controls the sampling channel order in the HT82V38. Bits D8 should always be set low. Bit D7 is

used when operating in 3-Channel Mode. Setting Bit D7 high will sequence the MUX to sample the red channel first,

then the green channel, and then the blue channel. When in this mode, the CDSCLK2 rising edge always resets the

MUX to sample the red channel first (see Timing Figure). When Bit D7 is set low, the channel order is reversed to blue

first, green second, and red third. The CDSCLK2 rising edge pulse will always reset the MUX to sample the blue chan-

nel first. Bits D6, D5, and D4 are used when operating in 1-Channel Mode. Bit D6 is set high to sample the red channel.

Bit D5 is set high to sample the green channel. Bit D4 is set high to sample the blue channel. The MUX will remain sta-

tionary during 1-Channel Mode. Bit D3 to Bit D0 control 4 bits DAC clamp voltage from 0.45V to 2.7V.

D8

D7

D6

D5

D4

D3

D2

D1

D0

3-Channel 1-Channel 1-Channel 1-Channel Clap[3]

Clap[2]

Clap[1]

Clap[0]

Set

to 1=R-G-B*

0 0=B-G-R

1=RED*

0=Off

1=GREEN 1=BLUE

0=Off*

0=Off *

1111=2.7V*

1110=2.55V

:

:

0001=0.6V

0000=0.45V

Note: * Power-on default value

MUX Register Settings

PGA Gain Register

There are three PGA registers for individually programming the gain in the red, green, and blue channels. Bits D8, D7,

and D6 in each register must be set low, and bits D5 through D0 control the gain range in 64 increments. See Figure for

a graph of the PGA Gain versus PGA register code. The coding for the PGA registers is straight binary, with an all ²ze-

ros² word corresponding to the minimum gain setting (1x) and an all ²ones² word corresponding to the maximum gain

setting (5.85x).

The PGA has a gain range from 1´(0dB) to 5.85´(15.3dB), adjustable in 64 steps. The Figure shows the PGA gain as a

function of the PGA register code. Although the gain curve is approximately linear in dB, the gain in V/V varies in non-

linear proportion with the register code, according to the following the equation:

Gain= 76

76 - G

Where ²G² is the decimal value of the gain register contents, and varies from 0 to 63.

1 5 .3 4

5 .8 5

12

5 .0

9

4 .0

6

3 .0

3

2 .0

0

1 .0

0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 63

P G A r e g is te r v a lu e - - D e c im a l

PGA Gain Transfer Function

Rev. 1.00

7

July 23, 2009

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