Datasheet

MCP3911
DS22286A-page 14 © 2012 Microchip Technology Inc.
Note: Unless otherwise indicated, AV
DD
= 3.3V, DV
DD
= 3.3 V; T
A
= 25°C, MCLK = 4 MHz; PRESCALE = 1;
OSR = 256; GAIN = 1; Dithering = Maximum; V
IN
= -0.5 dBFS @ 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.
40
50
60
70
80
90
100
110
120
Free Dynamic Range
(dBFS)
Boost = 0.5x
Boost = 0.66x
Boost = 2x
Boost = 1x
0
10
20
30
0 5 10 15 20 25 30
Spurious
Frequency (MHz)
40
50
60
70
80
90
100
110
120
N
oise and Distortion
R
atio (dB)
OSR = 32
OSR = 64
OSR = 128
OSR = 256
OSR = 4096
OSR = 2048
OSR = 1024
OSR = 512
0
10
20
30
12481632
Signal to
N
R
Gain (V/V)
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
80
-70
-60
-50
-40
-30
-20
-10
0
o
nic Distortion (dBc)
-120
-110
-100
-90
-
80
-6 -5 -4 -3 -2 -1 0 1 2 3
Total Harm
o
Input Signal Amplitude (dBFS)
Channel 0
Channel 1
0
10
20
30
40
50
60
70
80
90
100
110
120
-6 -5 -4 -3 -2 -1 0 1 2 3
Signal to Noise and Distortion
Ratio (dB)
Input Signal Amplitude (dBFS)
Channel 0
Channel 1