LMF100_15 Datasheet, PDF (23/40 Pages) Texas Instruments – LMF100 Dual High-Performance Switched Capacitor Filters

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LMF100
SNOSBG9B – JULY 1999 – REVISED JUNE 2015
Device Functional Modes (continued)
Table 1. Summary of Modes⁽¹⁾
MODE
BP
NUMBER
LP
HP
N
AP
OF
RESISTOR
ADJUSTABLE
f_CLK/f₀
S
NOTES
1
*
*
*
3
No
1a
H_OBP1 = −Q
H_OBP2 = + 1
H_OLP = + 1
1b
*
*
*
2
No
May need input buffer. Poor dynamics for high Q.
3
No
Useful for high-frequency applications.
2
*
3
*
*
*
*
*
3
Yes (above f_CLK/50 or
f_CLK/100)
4
Yes
Universal State-Variable Filter. Best general-purpose
mode.
3a
*
*
*
*
7
Yes
As above, but also includes resistor-tuneable notch.
4
*
*
*
3
No
Gives Allpass response with H_OAP = − 1 and H_OLP =
−2.
5
*
*
6a
*
*
H
OLP1
=
+1
6b
-R3
H
OLP 2
=
R2
*
4
3
2
Yes
Gives flatter allpass response than above
if R₁ = R₂ = 0.02R₄.
Yes
Single pole.
Yes
Single pole.
6c
*
*
3
No
Single pole.
7
2
Yes
Summing integrator with adjustable time constant.
(1) Realizable filter types (that is, lowpass) denoted by asterisks (*). Unless otherwise noted, gains of various filter outputs are inverting and
adjustable by resistor ratios.
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