MCP3911 datasheet(12/72 Pages) MICROCHIP

12 / 72 page

MCP3911

DS22286A-page 12

Note:

Unless otherwise indicated, AVDD = 3.3V, DVDD = 3.3V; TA = 25°C, MCLK = 4 MHz; PRESCALE = 1;

OSR = 256; GAIN = 1; Dithering = Maximum; VIN = -0.5 dBFS @ 60 Hz, VREFEXT = 0; CLKEXT = 1,

AZ_FREQ = 0; BOOST = 1X.

FIGURE 2-7:

Spurious Free Dynamic

Range Histogram.

FIGURE 2-8:

SNR Histogram.

FIGURE 2-9:

Noise Histogram.

FIGURE 2-10:

ENOB SINAD Histogram.

FIGURE 2-11:

ENOB SNR Histogram.

FIGURE 2-12:

THD vs. OSR.

104.5

106

107.5

109

110.5

112

113.5

115

Spurious Free Dynamic Range (dBFS)

94.5 94.6 94.8 94.9 95.1 95.2 95.4 95.5 95.6 95.8 95.9

Signal to Noise Ratio (dB)

1000

1500

2000

2500

3000

3500

4000

4500

5000

Channel 1

IN = 0V

A = 25 C

16384 Consecutive

Readings

500

1000

Output Code (LSB)

15.3 15.4

15.4 15.4 15.5

15.5 15.5 15.5 15.6

15.6

EffectiveNumberofBits(SINAD)

15.4

15.5

15.6

EffectiveNumberofBits(SNR)

-80

-70

-60

-50

-40

-30

-20

-10

Dithering = Medium

Dithering = Minimum

Dithering = None

-120

-110

-100

-90

128

256

512

1024

2048

4096

Oversampling Ratio (OSR)

Dithering = Maximum

ed u

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