Datasheet

 2012-2013 Microchip Technology Inc. DS20002286B-page 13
MCP3911
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 2-13: SINAD vs. OSR.
L
FIGURE 2-14: SNR vs.OSR.
FIGURE 2-15: SFDR vs. OSR.
FIGURE 2-16: THD vs. MCLK.
FIGURE 2-17: SINAD vs. MCLK.
FIGURE 2-18: SNR vs. MCLK.
0
10
20
30
40
50
60
70
80
90
100
110
120
32 64 128 256 512 1024 2048 4096
Signal-to-Noise and Distortion
Ratio (dB)
Oversampling Ratio (OSR)
Dithering = Maximum
Dithering = Medium
Dithering = Minimum
Dithering = None
0
10
20
30
40
50
60
70
80
90
100
110
120
32 64 128 256 512 1024 2048 4096
Signal-to-Noise Ratio (dB)
Oversampling Ratio (OSR)
Dithering = Maximum
Dithering = Medium
Dithering = Minimum
Dithering = NoQe
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
32 64 128 256 512 1024 2048 4096
Spurious Free Dynamic Range
(dBFS)
Oversampling Ratio (OSR)
Dithering = Maximum
Dithering = Medium
Dithering = Minimum
Dithering = None
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0 5 10 15 20 25 30
Total Harmonic Distortion (dBc)
MCLK Frequency (MHz)
Boost = 0.5x
Boost = 0.66x
Boost = 2x
Boost = 1x
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25
30
Signal-to-Noise and Distortion
Ratio (dB)
MCLK Frequency (MHz)
Boost = 0.5x
Boost = 0.66x
Boost = 2x
Boost = 1x
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25 30
Signal-to-Noise Ratio (dB)
MCLK Frequency (MHz)
Boost = 0.5x
Boost = 0.66x
Boost = 2x
Boost = 1x