Datasheet

Sallen-Key High-Pass Filter
4-5
Example Circuits
Figure 4–2. Sallen-Key High-Pass Filter with Single Supply Using Area 200
C204 C205
C212
C213
V2+
V2–
V2+
GND2
V1–
Power Supply Bypass
+
–
10
1
4
3
2
V2+
V2–
R206
C215
R219 C206
R221
R210
R220
R209
R208
R218
C214
C207
A2OUT
1/2 Dual Op Amp
A201–
A202–
A203+
A204+
+
–
R204
C209
R213 C202
R203
R202
R201
R211
R214
C210
C201
B2OUT
1/2 Dual Op Amp
B201–
B202–
B204+
B203+
R216
C
R
A
U202
R217
Voltage Reference
U201a
U201b
V2+
VREF2 = 2.5 V
R215
9
7
8
+
–
V
in
Jumper
Not Used
Jumper
Jumper
R212
CnC
R
Jumper
mR
TL431ACLP
Jumper
0.1 µF 10 µF
fo =
1
2π √mn
RC
Q =
√mn
m+1
V
OUT
= V
IN
–(f/fo)
2
1+(j/Q)(f/fo) – (f/fo)
2
+ VREF2
Jumper B204 + to VREF2
2.2 kΩ
5
A2/SD
A2 FLT
6
B2/SD
B2 FLT
C211
10 µF
R205
C203
R207
C208