Datasheet

MCP3901
DS22192D-page 10 © 2011 Microchip Technology Inc.
Note: Unless otherwise indicated, AV
DD
= 5.0V, DV
DD
= 5.0V; T
A
= +25°C, MCLK = 4 MHz; PRESCALE = 1;
OSR = 64; GAIN = 1; Dithering OFF; V
IN
= -0.5 dBFS @ 60 Hz.
FIGURE 2-7: Spectral Response.
FIGURE 2-8: Spectral Response.
FIGURE 2-9: Spurious Free Dynamic
Range Histogram.
FIGURE 2-10: Spurious Free Dynamic
Range vs. Oversampling Ratio.
FIGURE 2-11: Signal-to-Noise and
Distortion and Effective Number of Bits vs.
Oversampling Ratio.
FIGURE 2-12: Signal-to-Noise and
Distortion vs. Gain.
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
0 2000 4000 6000 8000
Frequency (Hz)
Amplitude (dB)
f
IN
= -0.5dBFS @ 60 Hz
f
D
= 15.6 ksps
16384 Point FFT
OSR = 64
Dithering ON
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
0 2000 4000 6000 8000
Frequency (Hz)
Amplitude (dB)
f
IN
= -60dBFS @ 60 Hz
f
D
= 15.6 ksps
16384 Point FFT
OSR = 64
Dithering ON
0
2
4
6
8
10
12
107 107.5 108 108.5 109 109.5 110 110.5 111
Spurious Free Dynamic Range (dB)
Frequency of Occurance
f
IN
= 60 Hz
MCLK = 4 MHz
OSR = 256
Dithering On
0
10
20
30
40
50
60
70
80
90
100
110
120
32 64 128 256
Oversampling Ratio (OSR)
Spurious Free Dynamic
Range (dB)
Dithering OFF
Dithering ON
50
55
60
65
70
75
80
85
90
95
100
32 64 128 256
Oversampling Ratio (OSR)
SINAD (dB)
8
9
10
11
12
13
14
15
16
Effective Number of Bits
Dithering ON
Dithering OFF
40
45
50
55
60
65
70
75
80
85
90
95
1 2 4 8 16 32
Gain (V/V)
SINAD (dB)
OSR = 256 (Dithering ON)
OSR = 32
OSR = 64
OSR = 128 (Dithering ON)