Datasheet

MCP621/1S/2/3/4/5/9
DS22188C-page 14 © 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
.
2.3 Frequency Response
FIGURE 2-24: CMRR and PSRR vs.
Frequency.
FIGURE 2-25: Open-Loop Gain vs.
Frequency.
FIGURE 2-26: Gain Bandwidth Product
and Phase Margin vs. Ambient Temperature.
FIGURE 2-27: Gain Bandwidth Product
and Phase Margin vs. Common Mode Input
Voltage.
FIGURE 2-28: Gain Bandwidth Product
and Phase Margin vs. Output Voltage.
FIGURE 2-29: Closed-Loop Output
Impedance vs. Frequency.
10
20
30
40
50
60
70
80
90
100
1.E+2 1.E+3 1.E+4 1.E+5 1.E+6 1.E+7
Frequency (Hz)
CMRR, PSRR (dB)
CMRR
100 1M10k 10M100k1k
PSRR+
PSRR-
-20
0
20
40
60
80
100
120
140
1.E+0 1.E+1 1.E+2 1.E+3 1.E+4 1.E+5 1.E+6 1.E+7 1.E+8
Frequency (Hz)
Open-Loop Gain (dB)
-240
-210
-180
-150
-120
-90
-60
-30
0
Open-Loop Phase (°)
| A
OL
|
∠
A
OL
10 1k 100k 10M1 100 10k 1M 100M
15
20
25
30
35
40
45
-50-25 0 255075100125
Ambient Temperature (°C)
Gain Bandwidth Product
(MHz)
40
45
50
55
60
65
70
Phase Margin (°)
PM
GBWP
V
DD
= 5.5V
V
DD
= 2.5V
15
20
25
30
35
40
45
-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)
Gain Bandwidth Product
(MHz)
40
45
50
55
60
65
70
Phase Margin (°)
PM
GBWP
V
DD
= 5.5V
V
DD
= 2.5V
15
20
25
30
35
40
45
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Output Voltage (V)
Gain Bandwidth Product
(MHz)
40
45
50
55
60
65
70
Phase Margin (°)
PM
GBWP
V
DD
= 5.5V
V
DD
= 2.5V
0.1
1
10
100
1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08
Frequency (Hz)
1k 1M 10M 100M
Open-Loop Output Impedance (Ω)
10k 100k
G = 101 V/V
G = 11 V/V
G = 1 V/V