Datasheet
© 2011 Microchip Technology Inc. DS25048B-page 11
MCP3903
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 2-13: Total Harmonic Distortion
vs. Input Signal Frequency.
FIGURE 2-14: Total Harmonic Distortion
vs. Temperature.
FIGURE 2-15: Signal-to-Noise and
Distortion vs. Input Signal Frequency.
FIGURE 2-16: Signal-to-Noise and
Distortion vs. Temperature.
FIGURE 2-17: Signal-to-Noise and
Distortion vs. Input Signal Amplitude.
FIGURE 2-18: Signal-to-Noise and
Distortion vs. Master Clock.
-60
o
n
fs=15.625KHz
OSR 64
80
-70
-60
s
tortion
fs=15.625KHz
OSR=64
-90
-80
-70
-60
o
nic Distortion
d
Bc)
fs=15.625KHz
OSR=64
Dithering OFF
-100
-90
-80
-70
-60
H
armonic Distortion
(dBc)
fs=15.625KHz
OSR=64
Dithering OFF
Dithering ON
-110
-100
-90
-80
-70
-60
T
otal Harmonic Distortion
(dBc)
fs=15.625KHz
OSR=64
Dithering OFF
Dithering ON
-120
-110
-100
-90
-80
-70
-60
20 50 100 200 500 1000 2000
Total Harmonic Distortion
(dBc)
fs=15.625KHz
OSR=64
Dithering OFF
Dithering ON
-120
-110
-100
-90
-80
-70
-60
20 50 100 200 500 1000 2000
Total Harmonic Distortion
(dBc)
Input Frequency (Hz)
fs=15.625KHz
OSR=64
Dithering OFF
Dithering ON
0
on
fs=15.625KHz
-
40
-20
0
D
istortion
fs=15.625KHz
OSR=64
-60
-40
-20
0
m
onic Distortion
(
dBc)
fs=15.625KHz
OSR=64
-80
-60
-40
-20
0
Harmonic Distortion
(dBc)
fs=15.625KHz
OSR=64
-
120
-100
-80
-60
-40
-20
0
Total Harmonic Distortion
(dBc)
fs=15.625KHz
OSR=64
-120
-100
-80
-60
-40
-20
0
-40 -20 0 25 45 85 105 125
Total Harmonic Distortion
(dBc)
Temperature (
°
C)
fs=15.625KHz
OSR=64
-120
-100
-80
-60
-40
-20
0
-40 -20 0 25 45 85 105 125
Total Harmonic Distortion
(dBc)
Temperature (°C)
fs=15.625KHz
OSR=64
90
100
Dithering OFF
70
80
90
100
B
)
Dithering OFF
Dithering ON
40
50
60
70
80
90
100
N
AD (dB)
Dithering OFF
Dithering ON
20
30
40
50
60
70
80
90
100
SINAD (dB)
Dithering OFF
Dithering ON
fs
=
15 625KHz
0
10
20
30
40
50
60
70
80
90
100
SINAD (dB)
Dithering OFF
Dithering ON
fs=15.625KHz
OSR=64
0
10
20
30
40
50
60
70
80
90
100
20 50 100 200 500 1000 2000
SINAD (dB)
Input Frequency (Hz)
Dithering OFF
Dithering ON
fs=15.625KHz
OSR=64
0
10
20
30
40
50
60
70
80
90
100
20 50 100 200 500 1000 2000
SINAD (dB)
Input Frequency (Hz)
Dithering OFF
Dithering ON
fs=15.625KHz
OSR=64
120
fs=15.625KHz
80
100
120
)
fs=15.625KHz
OSR=64
60
80
100
120
A
D (dB)
fs=15.625KHz
OSR=64
40
60
80
100
120
SINAD (dB)
fs=15.625KHz
OSR=64
20
40
60
80
100
120
SINAD (dB)
fs=15.625KHz
OSR=64
0
20
40
60
80
100
120
-40 -20 0 25 45 85 105 125
SINAD (dB)
fs=15.625KHz
OSR=64
0
20
40
60
80
100
120
-40 -20 0 25 45 85 105 125
SINAD (dB)
Temperature (°C)
fs=15.625KHz
OSR=64
80
90
60
70
80
90
B)
40
50
60
70
80
90
N
AD (dB)
20
30
40
50
60
70
80
90
SINAD (dB)
0
10
20
30
40
50
60
70
80
90
SINAD (dB)
-10
0
10
20
30
40
50
60
70
80
90
0.00001 0.001 0.1 10 1000
SINAD (dB)
Input Signal Amplitude (mV)
-10
0
10
20
30
40
50
60
70
80
90
0.00001 0.001 0.1 10 1000
SINAD (dB)
Input Signal Amplitude (mV)