2009-2011 Microchip Technology Inc.
DS22197B-page 13
MCP631/2/3/4/5/9
Note: Unless otherwise indicated, TA =+25°C, VDD = +2.5V to 5.5V, VSS = GND, VCM =VDD/3, VOUT =VDD/2,
VL =VDD/2, RL =2 kto VL, CL = 50 pF and CS =VSS.
2.4
Noise and Distortion
FIGURE 2-29:
Input Noise Voltage Density
vs. Frequency.
FIGURE 2-30:
Input Noise Voltage Density
vs. Input Common Mode Voltage with f = 100 Hz.
FIGURE 2-31:
Input Noise Voltage Density
vs. Input Common Mode Voltage with f = 1 MHz.
FIGURE 2-32:
Input Noise vs. Time with
0.1 Hz Filter.
FIGURE 2-33:
THD+N vs. Frequency.
1.E+0
1.E+1
1.E+2
1.E+3
1.E+4
1.E-1
1.E+0
1.E+1
1.E+2
1.E+3
1.E+4
1.E+5
1.E+6
1.E+7
Frequency (Hz)
0.1
100
10k
1M
In
p
u
tN
o
is
e
V
o
lt
ag
e
D
en
sity
(V
/
Hz)
1
1k
100k
10M
10
1n
100n
1
10
10n
0
20
40
60
80
100
120
140
160
180
200
-0
.5
0.
0
0.
5
1.
0
1.
5
2.
0
2.
5
3.
0
3.
5
4.
0
4.
5
5.
0
5.
5
6.
0
Common Mode Input Voltage (V)
VDD = 5.5V
VDD = 2.5V
In
p
u
tN
o
is
eV
o
lt
ag
e
D
ens
it
y
(n
V
/
Hz
)
f = 100 Hz
0
2
4
6
8
10
12
14
16
18
20
-0
.5
0.
0
0.
5
1.
0
1.
5
2.
0
2.
5
3.
0
3.
5
4.
0
4.
5
5.
0
5.
5
Common Mode Input Voltage (V)
VDD = 5.5V
VDD = 2.5V
In
p
u
tN
o
is
eV
o
lt
ag
e
D
ens
it
y
(n
V
/
Hz
)
f = 1 MHz
-20
-15
-10
-5
0
5
10
15
20
0
5 10 15 20 25 30 35 40 45 50 55 60 65
Time (min)
In
put
N
o
is
e;
e
ni
(t)
(
V)
Representative Part
Analog NPBW = 0.1 Hz
Sample Rate = 2 SPS
VOS = -3150 V
0.0001
0.001
0.01
0.1
1
1.E+2
1.E+3
1.E+4
1.E+5
Frequency (Hz)
TH
D
+
N
o
ise
(%
)
VDD = 5.0V
VOUT = 2 VP-P
100
1k
10k
100k
BW = 22 Hz to 80 kHz
BW = 22 Hz to > 500 kHz
G = 1 V/V
G = 11 V/V