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ManualsBrandsMICROCHIP TECHNOLOGY ManualsData collecting ICsData acquisition IC - Analog front end (AFE) 24 Bit SSOP 28
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MCP3903
DS25048B-page 10 © 2011 Microchip Technology Inc.
Note: Unless otherwise indicated, AV
DD
= 5.0V, DV
DD
= 3.3 V; 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: Spurious Free Dynamic
Range vs Oversampling Ratio.
FIGURE 2-9: Signal-to-Noise and
Distortion vs. Oversampling Ratio.
FIGURE 2-10: Signal-to-Noise and
Distortion vs. Gain (Dithering OFF).
FIGURE 2-11: Signal-to-Noise and
Distortion vs. Gain (Dithering ON).
FIGURE 2-12: Total Harmonic Distortion
vs. Oversampling Ratio.
120
ic
Dithering ON
80
100
120
D
ynamic
B
)
Dithering ON
Dithering OFF
60
80
100
120
Free Dynamic
n
ge (dB)
Dithering ON
Dithering OFF
40
60
80
100
120
r
ious Free Dynamic
Range (dB)
Dithering ON
Dithering OFF
0
20
40
60
80
100
120
Spurious Free Dynamic
Range (dB)
Dithering ON
Dithering OFF
0
20
40
60
80
100
120
32 64 128 256
Spurious Free Dynamic
Range (dB)
Oversampling Ratio (OSR)
Dithering ON
Dithering OFF
0
20
40
60
80
100
120
32 64 128 256
Spurious Free Dynamic
Range (dB)
Oversampling Ratio (OSR)
Dithering ON
Dithering OFF
120
80
100
120
B
)
Dithering OFF
Dithering ON
60
80
100
120
N
AD (dB)
Dithering OFF
Dithering ON
40
60
80
100
120
SINAD (dB)
Dithering OFF
Dithering ON
0
20
40
60
80
100
120
SINAD (dB)
Dithering OFF
Dithering ON
0
20
40
60
80
100
120
32 64 128 256
SINAD (dB)
Dithering OFF
Dithering ON
0
20
40
60
80
100
120
32 64 128 256
SINAD (dB)
Oversampling Ratio (OSR)
Dithering OFF
Dithering ON
95
100
85
90
95
100
B
)
OSR = 256
70
75
80
85
90
95
100
N
AD (dB)
OSR = 256
OSR = 128
OSR = 64
60
65
70
75
80
85
90
95
100
SINAD (dB)
OSR = 256
OSR = 128
OSR = 32
OSR = 64
50
55
60
65
70
75
80
85
90
95
100
SINAD (dB)
OSR = 256
OSR = 128
OSR = 32
OSR = 64
50
55
60
65
70
75
80
85
90
95
100
12481632
SINAD (dB)
GAIN (V/V)
OSR = 256
OSR = 128
OSR = 32
OSR = 64
50
55
60
65
70
75
80
85
90
95
100
12481632
SINAD (dB)
GAIN (V/V)
OSR = 256
OSR = 128
OSR = 32
OSR = 64
95
100
85
90
95
100
)
OSR = 256
75
80
85
90
95
100
A
D (dB)
OSR = 256
OSR = 128
65
70
75
80
85
90
95
100
SINAD (dB)
OSR = 256
OSR = 128
OSR = 64
55
60
65
70
75
80
85
90
95
100
SINAD (dB)
OSR = 256
OSR = 128
OSR = 64
OSR = 32
50
55
60
65
70
75
80
85
90
95
100
12481632
SINAD (dB)
OSR = 256
OSR = 128
OSR = 64
OSR = 32
50
55
60
65
70
75
80
85
90
95
100
12481632
SINAD (dB)
GAIN (V/V)
OSR = 256
OSR = 128
OSR = 64
OSR = 32