Datasheet

 2009-2011 Microchip Technology Inc. DS22197B-page 13
MCP631/2/3/4/5/9
Note: Unless otherwise indicated, T
A
=+25°C, V
DD
= +2.5V to 5.5V, V
SS
= GND, V
CM
=V
DD
/3, V
OUT
=V
DD
/2,
V
L
=V
DD
/2, R
L
=2kto V
L
, C
L
= 50 pF and CS =V
SS
.
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
Input Noise Voltage Density (V/

Hz)
1 1k 100k 10M10
1n
100n
1µ
10µ
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)
V
DD
= 5.5V
V
DD
= 2.5V
Input Noise Voltage Density
(nV/

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)
V
DD
= 5.5V
V
DD
= 2.5
V
Input Noise Voltage Density
(nV/

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)
Input Noise; e
ni
(t) (µV)
Representative Part
Analog NPBW = 0.1 Hz
Sample Rate = 2 SPS
V
OS
= -3150 µV
0.0001
0.001
0.01
0.1
1
1.E+2 1.E+3 1.E+4 1.E+5
Frequency (Hz)
THD + Noise (%)
V
DD
= 5.0V
V
OUT
= 2 V
P-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