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MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
10
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Table 1. Filter Operating Modes
MODE
LP
HP
BP
N
LP-N*
HP-N*
COMMENTS
1
fCLK/fO ratio is the nominal value. Good for bandpass filters
with identical sections cascaded, higher order Butterworth filters,
high-Q bandpass, low-Q notches.
1B
Same as Mode 1 with fCLK/fO ratios greater than the nominal
value.
2
Combination of Mode 1 and Mode 3; fCLK/fO ratios always
less than the nominal value. Less sensitivity to resistor tolerances
than Mode 3.
2N
Extension of Mode 2 that allows higher frequencies. Highpass
and lowpass outputs are summed with external op amp and
two resistors. Good for lowpass elliptic filters.
3
Adjustable fO above and below the nominal frequency.
Commonly used for multiple-pole Chebyshev filters, all-pole
higher order bandpass, lowpass, and highpass filters.
3A
Extension of Mode 3 that needs an external op amp and
two additional resistors. Commonly used for lowpass or higher
elliptic or Cauer filters.
*
LP-N = lowpass notch, HP-N = highpass notch. Both require an external op amp. See Definition of Terms (Table 2).
Table 2. Definition of Terms
TERM
DEFINITION
fCLK
The clock frequency applied to the switched-capacitor filter.
fO
The center frequency of the 2nd-order complex pole pair, fO, is determined by measuring the peak response
frequency at the bandpass output.
fNOTCH
The frequency of minimum amplitude response at the notch output.
Q
Quality factor, or Q, is the ratio of fO to the -3dB bandwidth of the 2nd-order bandpass filter. Q also determines
the amount of amplitude peaking at the lowpass and highpass outputs, but is not measured at these outputs.
HOBP
The gain in V/V of the bandpass output at f = fO.
HOLP
The gain in V/V of the lowpass output at f
→0Hz.
HOHP
The gain in V/V of the highpass output at f
→fCLK/2.
HON1
The notch output gain as f
→0Hz.
HON2
The notch output gain at f = fCLK/2.
LP-N
A notch output with HON1 > HON2.
HP-N
A notch output with HON1 < HON2.
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