MF10 Datasheet, PDF (12/20 Pages) National Semiconductor (TI) – Universal Monolithic Dual Switched Capacitor Filter

2 0 Modes of Operation (Continued)
MODE 5 Numerator Complex Zeros BP LP
(See Figure 13 )
f_O
0 0 ^e
R2
1a
f_CLK
c
or
1 a ^R2 c ^fCLK
R4 100
R4 50
f_z
0 0 ^e
R2
1b c
f_CLK
or
1 b ^R1 c ^fCLK
R4 100
R4 50
R3
Q
e
01 ^a R2
R4 c
R2
R3
Q_Z e 01 b R1 R4 c _R1
x H_0z1 e gain at C Z output (as f
0 Hz)
b_{R2(R4 b R1)}
R1(R2 a R4)
 ^x J ^{H0z2 e gain at C Z output as f}
f_CLK
b_R2
e
2
R1
 J ^R2
R3
H_OBP
eb
a1
R1
c
R2
 J ^{R2 a R1 R4}
H_OLP e b _{R2 a R4}
c
R1
MODE 6a Single Pole HP LP Filter (See Figure 14 )
f_c e cutoff frequency of LP or HP output
e R2 f_{CLK or} R2 f_CLK
R3 100 R3 50
R3
H_OLP
eb
R1
R2
H_OHP
eb
R1
MODE 6b Single Pole LP Filter (Inverting and Non-In-
verting) (See Figure 15 )
f_c
e cutoff frequency of LP outputs
R2
j
f_CLK
or
R2
f_CLK
R3 100 R3 50
H_OLP1 e 1 (non-inverting)
R3
H_OLP2
e
b
R2
FIGURE 13 MODE 5
TL H 10399 – 22
FIGURE 14 MODE 6a
TL H 10399 – 23
FIGURE 15 MODE 6b
12
TL H 10399 – 24