CS7620 查看數據表（PDF） - Cirrus Logic

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产品描述 (功能)

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CS7620

CCD Imager Analog Processor

Cirrus Logic 

CS7620

Bit

Mnemonic

Function

Number of Data Bits Out: The range of the output data can be determined

by these bits. The data internal to the chip has a 13-bit range. The output can

3

bits_out1

be this full range, half this range (12 bits), or an eighth of this range (10 bits).

If 12-bit data is selected, the top half of the 13-bit range is saturated to the

maximum 12-bit code. If 10-bit data is selected, the compander curve which

is user programmable is employed to map the 13-bit data to the 10-bit output.

2

bits_out1

0 - 10 bits output

1 - 10 bits output

2 - 13 bits output

3 - 12 bits output

Black Level Loop Disabled: If the user chooses to adjust the black level him-

self through register access, he may disable the internal black level loop. This

loop usually updates the black level to what it calculates to be the correct level.

1

blk_dis

If disabled, the offset used will be determined from the value written in the

black level accumulator register.

0 - internal black level loop is enabled

1 - black level loop is disabled

Offset Range: The black level loop is used to cancel any offsets from the

CCD and chip circuitry. If the offsets are small, the user has the option to de-

crease the offset cancellation range for the added advantage of increasing the

0

off_range

resolution of the offset cancellation.

0 - smaller offset cancellation range used (~50 mV)

1 - larger offset cancellation range used (~100 mV)

Mode value

000

001

010

100

101

110

111

Mode

IBM35CCD2PIX1 and IBM35CCDPIX13 CCD high resolution mode

IBM35CCD2PIX1 CCD low resolution (viewfinder) mode

reserved

reserved

IBM35CCD13PIX CCD (2x2) low resolution (viewfinder) mode

IBM35CCD13PIX CCD (3x4) low resolution (viewfinder) mode

external timing used

Table 8. Different Resolution Operating Modes

30

DS301PP2

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