MCP621/1S/2/3/4/5/9
DS22188C-page 16
2009-2011 Microchip Technology Inc.
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 kΩ to VL, CL = 50 pF, and CAL/CS =VSS.
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
In
pu
t
N
o
is
e
V
o
lt
ag
eD
e
n
s
it
y(
n
V/
√Hz)
11k
100k
10M
10
10n
100n
1
10
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)
VDD = 5.5V
VDD = 2.5V
In
p
u
tN
o
is
e
V
o
lt
ag
e
D
en
si
ty
(n
V
/√
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)
VDD = 5.5V
VDD = 2.5V
Inp
u
tN
o
is
eV
o
lt
ag
e
D
en
si
ty
(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
Time (min)
In
p
u
tO
ffs
et
+
N
o
is
e;
V
OS
+
e
ni
(t
)(
V)
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)
T
HD
+
No
is
e(
%
)
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