CS7620 datasheet(32/70 Pages) CIRRUS

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CS7620

DS301PP2

4.6

Black Level Control - Accumulator (LSB)

Default = 00h; Read/Write (address 0Dh)

4.7

Black Level Control - Accumulator (MSB)

Default = 01h; Read/Write (address 0Eh).

fs_lvl

Full Scale Voltage

0.53 V

1.07 V

1.60 V

Table 9. Full Scale Level Choices

Bit Number

765432

Bit Name

accumulator7 accumulator6 accumulator5 accumulator4 accumulator3 accumulator2 accumulator1 accumulator0

Default

0000000

Bit

Mnemonic

Function

accumulator7

Black Level Accumulator: See Description of register 0Eh.

accumulator6

accumulator5

accumulator4

accumulator3

accumulator2

accumulator1

accumulator0

Bit Number

765432

Bit Name

Reserved

accumulator8

Default

----

---

Bit

Mnemonic

Function

7:1

Reserved

accumulator8

Black Level Accumulator: The black level accumulator is a 9 bit number rep-

resenting an amount of offset added to the input of the CDS circuit. The black

level loop alters the black level accumulator value to make the output of the

ADC settle to code 64 during black pixels. If desired the black loop may be

disabled and written to manually to add any desired amount of offset. There

is a total of ~100 mV of offset range if the offset range register setting is set to

1 or ~50 mV when this register setting is set to “0”. This offset range is used

to correct for CCD offsets plus internal offsets generated in the analog path of

this chip. The offset range before subtracting the internal offsets is as shown

in Table 10 below with the worst case internal offsets being ±17 mV.

Offset Range (Reg

06h bit 0)

Max Offset Blk Acc=511

Min Offset Blk Acc=0

Accumulator LSB Size

~30 mV

~-72 mV

~0.2 mV

~11 mV

~-40 mV

~0.1 mV

Table 10. Offset Range

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