Datasheet

MCP621/1S/2/3/4/5/9
DS22188C-page 16 © 2009-2011 Microchip Technology Inc.
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
=2kΩ to V
L
, C
L
= 50 pF, and CAL/CS =V
SS
.
2.4 Input Noise and Distortion
FIGURE 2-32: Input Noise Voltage Density
vs. Frequency.
FIGURE 2-33: Input Noise Voltage Density
vs. Input Common Mode Voltage with f = 100 Hz.
FIGURE 2-34: Input Noise Voltage Density
vs. Input Common Mode Voltage with f = 1 MHz.
FIGURE 2-35: Input Noise plus Offset vs.
Time with 0.1 Hz Filter.
FIGURE 2-36: THD+N vs. Frequency.
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 (nV/
√
Hz)
11k100k10M10
10n
100n
1µ
10µ
0
50
100
150
200
250
300
-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
5
10
15
20
25
30
-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
= 2.5V
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
Time (min)
Input Offset + Noise;
V
OS
+ e
ni
(t) (µV)
Representative Part
Analog NPBW = 0.1 Hz
Sample Rate = 2 SPS
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