Datasheet

MCP3911
DS20002286B-page 12  2012-2013 Microchip Technology Inc.
Note: Unless otherwise indicated, AV
DD
= 3.3V, DV
DD
= 3.3V; T
A
= +25°C, MCLK = 4 MHz; PRESCALE = 1;
OSR = 256; GAIN = 1; Dithering = Maximum; V
IN
= -0.5 dBFS at 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
Frequency of Occurrence
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
Frequency of Occurrence
Signal-to-Noise Ratio (dB)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Frequency Of Occurrence
Output Code (LSB)
Channel 1
V
IN
= 0V
T
A
= +25°C
16384 Consecutive
Readings
15.3 15.4 15.4 15.4 15.5 15.5 15.5 15.5 15.6 15.6
Frequency of Occurrence
Effective Number of Bits (SINAD)
15.4 15.4 15.5 15.5 15.5 15.5 15.6 15.6 15.6 15.6
Frequency of Occurrence
Effective Number of Bits (SNR)
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
32 64 128 256 512 1024 2048 4096
Total Harmonic Distortion (dBc)
Oversampling Ratio (OSR)
Dithering = Maximum
Dithering = Medium
Dithering = Minimum
Dithering = None