U4082B Datasheet, PDF (12/30 Pages) ATMEL Corporation – Low-voltage Voice-switched IC for Hands-free Operation

Figure 3-6. High-pass Filter
V_B
R₁ 56 kΩ
220 kΩ R₂
C₁
4700 pF
2
4700 pF
C₂ ^FI
V_S
300 kΩ
1
FO
260 µA
50
0
-3.0
305Hz
f_N
=
1
2π
1
C² R₁R₂
for C₁ = C₂
-30
f_N
Figure 3-7. Low-pass Filter
V_{B 220 kΩ}
C₁
0.01 µF
R₁
R₂
FI
+1
1
V_{I 13 kΩ}
13 kΩ
2
FO
0.001 µF
C₂
12 U4082B
4.0
0
-3.0
f_N
=
1
2π
1
C ₁C₂R²
for R₁ = R₂
-30
f_N
20 kHz
4743D–CORD–03/06