Datasheet

MCP3911
DS20002286B-page 14  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 2-19: SFDR vs. MCLK.
FIGURE 2-20: SINAD vs. GAIN.
FIGURE 2-21: SINAD vs. GAIN (Dithering
Off).
FIGURE 2-22: SINAD vs. GAIN vs. AZ
Speed Chart.
FIGURE 2-23: THD vs. Input Signal
Amplitude.
FIGURE 2-24: SINAD vs. Input Signal
Amplitude.
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25 30
Spurious Free Dynamic Range
(dBFS)
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
12481632
Signal-to-Noise and Distortion
Ratio (dB)
Gain (V/V)
OSR = 32
OSR = 64
OSR = 128
OSR = 256
OSR = 512
OSR = 1024
OSR = 2048
OSR = 4096
0
10
20
30
40
50
60
70
80
90
100
110
120
12481632
Signal to Noise and Distortion
Ratio (dB)
Gain (V/V)
OSR = 32
OSR = 64
OSR = 128
OSR = 256
OSR = 512
OSR = 1024
OSR = 2048
OSR = 4096
70
75
80
85
90
95
100
12481632
Signal-to-Noise and Distortion
Ratio (dB)
Gain (V/V)
Auto Zero Speed = Fast
Auto Zero Speed = Slow
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-6-5-4-3-2-10123
Total Harmonic Distortion (dBc)
Input Signal Amplitude (dBFS)
Channel 1
Channel 0
0
10
20
30
40
50
60
70
80
90
100
110
120
-6-5-4-3-2-10123
Signal-to-Noise and Distortion
Ratio (dB)
Input Signal Amplitude (dBFS)
Channel 1
Channel 0