Microchip Technology MCP6N16, Руководство пользователя, Страница: 22 / 36

MCP6N16 Evaluation Board User’s Guide
DS50002365A-page 22

2015 Microchip Technology Inc.
The complete frequency response of the signal path consisting of the input filter,
MCP6N16 and the output filter is shown in
Figure 2-6 . Here, the -3 dB frequency corner
is at approximately 300 Hz with a flat gain out to about 30 Hz.
FIGURE 2-6: Frequency Response of the Complete Signal Path for a
Differential Gain of 101V/V.
Figure 2-7 shows the signal path including the input and output RC filters of the
MCP6N16. The RC output filter is similar to the input filter with the exception that the
common-mode pole is set at about 1.59 kHz and the differential pole is at about
756 Hz. Once the actual nature of the sensor/input signal and its bandwidth is known,
the filter poles can be adjusted to limit further the noise-bandwidth and to optimize the
interface to an A/D converter that may follow.
FIGURE 2-7: Instrumentation Amplifier MCP6N16 Signal Path Circuitry.
20
30
40
50
60
70
80
90
100
110
1 10 100 1000
Differential Gain V/V
f (Hz)
10R
R2
1
2 3
J10
IN+
3
2
IN-
OUT
7
VSS
4
VDD
8
I N+
IN-
OUT
V SS
V DD
VR
E
F
5
VF
G
6
EN
1
U1
GND
0.1uF
C3
100R
R15
100R
R18
VREF
1
2
3
J11
GND
GND
1 2 3
J9
0.01uF
C11
GND
GND
CS1
J7
GND
GND
MCP6N16-100
Gain Select:
1-2: 101V/V
2-3: 301V/V
VCM
1M
R4
1
2
J4
GND
10k
R12
Vout1/CH0+IN
Vout2/CH0-IN
0R
R6
0R
R9
R6, R9: for
AC-coupled
inputs replace
with 0.1uF caps
High = Enabled
Low = Disabled/shut-down
2k
R7
2k
R10
0.01uF
C6
C9 0.01u
10k
R11
200k
R14
200k
R13
TP4
TP1
20K
R16
VDUT
1k
R30
DNP
DNP
0.1uF
C7
0.01uF
C8
0.01uF
C12
0.01uF
C10
10k
R8
10k
R19
TP7
1
1
1