Delta 45 Specifications download pdf (Page 34)

DGF =

32 + 4 x DGFa + DGFb

ADC12EU050

SNAS444I –JANUARY 2008–REVISED APRIL 2013

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Decimator Clipping Control Register

• Address: 14h

• Attributes: Write Only

• Register 15h reads back contents of Register 14h

b[7] b[6] b[5] b[4] b[3] b[2] b[1] b[0] HEX

Description CGS Reserved a[2:0] b[2:0]

Default 0 0 0 0 0 0 0 0 00 h

Bit Description

7 CGS: Custom Gain Setting. This bit is used to override the automatic gain settings for ADC and IOR modes.

If the user wishes to write a custom digital gain coefficient using a[2:0] and b[2:0] of this register, then the CGS

bit must be set.

0 Normal operation Automatic gain settings used

1 Custom Gain Setting Gain setting from a[2:0] and b[2:0] used.

6 Reserved. Write as zero for future compatibility.

5:3 a[2:0]: Digital Gain Coefficient. In clipping mode the input range of an ADC channel is limited to 1.56Vpp. In

ADC mode the input range is 2.10Vpp. The output of the digital filter has to be scaled according to the selected

mode (the filter data has to be mapped in to the 12bit output data), the difference between 1.6Vpp and 2.2Vpp

is -2.6dB, hence the digital filter gain has to be set to 2.6dB when in IOR mode and to 0dB when in clipping

mode (default mode) . This is performed by setting a Digital Gain Factor which is calculated using the following

formula:

The mapping of the coefficient values for a[2:0] is as follows:

011 = Not used. Defaults to 2

010 = 2

001 = 1

000 = 0

111 = -1

110 = -2

101 = Not used. Defaults to -2

100 = Not used. Defaults to -2

The mapping of the coefficient values for b[2:0] is shown below. The table on the following page shows the

available Digital Gain Coefficient settings.

2:0 b[2:0]: Digital Gain Coefficient.

The mapping of the coefficient values for b[2:0] is as follows:

011 = Not used. Defaults to 2

010 = 2

001 = 1

000 = 0

111 = -1

110 = -2

101 = Not used. Defaults to -2

100 = Not used. Defaults to -2

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Delta 45 Specifications Page 34

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