CS7622 datasheet(23/36 Pages) CIRRUS

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CS7622

DS322PP1

Gain Calibration Offset 1

Default = 00h; Read only (address 0Eh)

Gain Calibration Offset 2

Default = 00h; Read only (address 0Fh)

Gain Calibration Offset 3

Default = 00h; Read only (address 10h)

Bit Number

765432

Bit Name

gain_offset

Default

000000

Bit

Mnemonic

Function

7:0

gain_offset17-10

offset added to 4x gain segment, values are in 2’s complement. See details in

Bit Number

765432

Bit Name

gain_offset

Default

000000

Bit

Mnemonic

Function

7:0

gain_offset27-20

offset added to 2x gain segment, values are in 2’s complement. See details in

Bit Number

765432

Bit Name

gain_offset

Default

000000

Bit

Mnemonic

Function

7:0

gain_offset37-30

Offset added to 1x gain segment. Values are in 2’s complement.

These registers are used to report some of the calibration settings. After cali-

bration is performed the gain offset registers are automatically updated with val-

ues needed for the DRX circuitry to operate correctly. These registers should

not be written to since this will remove the proper settings found during calibra-

tion. The gain offset values are used to add an offset to the output of the ADC

when using different analog gain settings (See equations below). The purpose

of this is to produce a continuous transition between the different gain settings

so that the final 13 bit output is monotonic and has no undesired artifacts. (See

Figure 17)

{ADC_out

if in the 8x gain segment}

dout[12:0] =

{ADC_out*2+Offset1

if in the 4x gain segment}

{ADC_out*4+Offset2*2

if in the 2x gain segment}

{ADC_out*8+Offset3*4

if in the 1x gain segment}

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