MCP3918 datasheet(36/88 Pages) MICROCHIP

36 / 88 page

MCP3918

DS20005287A-page 36

 2014 Microchip Technology Inc.

FIGURE 5-6:

Output Data Formats.

The ADC resolution is a function of the OSR

(Section 5.4 “SINC3 + SINC1 Filter”). The resolution

is the same for all channels. No matter what the

resolution is, the ADC output data is always calculated

in 24-bit words, with added zeros at the end if the OSR

is not large enough to produce 24-bit resolution (left

justification).

WIDTH_DATA<1:0> =

32-bit with sign extension

DATA

<23>

DATA

<23:16>

DATA

<15:8>

DATA

<7:0>

WIDTH_DATA<1:0> =

32-bit with zeros padded

0x00

DATA

<23:16>

DATA

<7:0>

DATA

<15:8>

WIDTH_DATA<1:0> =

24-bit

DATA

<23:16>

DATA

<15:8>

DATA

<7:0>

WIDTH_DATA<1:0> =

16-bit

DATA

<15:8>

DATA

<23:16>

Rounded

Unformatted ADC data

DATA

<23:16>

DATA

<15:8>

DATA

<7:0>

x1/256

x256

Scaling

Factor

TABLE 5-5:

OSR = 256 (AND HIGHER) OUTPUT CODE EXAMPLES

ADC Output Code (MSB First)

Hexadecimal

Decimal,

24-bit Resolution

0111

1111

111 1

1111

0x7FFFFF

+ 8,388,607

0111

1111

111 1

1110

0x7FFFFE

+ 8,388,606

0000

000 0

0000

0x000000

1111

111 1

1111

0xFFFFFF

-1

1000

0000

000 0

0001

0x800001

- 8,388,607

1000

0000

000 0

0000

0x800000

- 8,388,608

TABLE 5-6:

OSR = 128 OUTPUT CODE EXAMPLES

ADC Output Code (MSB First)

Hexadecimal

Decimal,

23-bit Resolution

0111

1 111

1111

1 111

1111

111 0

0x7FFFFE

+ 4,194,303

0111

1 111

1111

1 110

1111

110 0

0x7FFFFC

+ 4,194,302

0000

0 000

0000

0 000

0000

000 0

0x000000

1111

1 111

1111

1 111

1111

111 0

0xFFFFFE

-1

1000

0 000

0000

0 000

0000

001 0

0x800002

- 4,194,303

1000

0 000

0000

0 000

0000

000 0

0x800000

- 4,194,304

TABLE 5-7:

OSR = 64 OUTPUT CODE EXAMPLES

ADC Output Code (MSB First)

Hexadecimal

Decimal,

20-bit Resolution

01 11

1 111

1 1 1 1

0 0 0 0

0x7FFFF0

+ 524, 287

01 11

1 111

1 1 1 1

1 1 1 0

0 0 0 0

0x7FFFE0

+ 524, 286

00 00

0 000

0 0 0 0

0x000000

11 11

1 111

1 1 1 1

0 0 0 0

0xFFFFF0

-1

10 00

0 000

0 0 0 0

0 0 0 1

0 0 0 0

0x800010

- 524,287

10 00

0 000

0 0 0 0

0x800000

- 524, 288

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