The MAX7490/MAX7491 consist of two identical low-power,
low-voltage, wide dynamic range, rail-to-rail,
2nd-order switched-capacitor building blocks. Each of
the two filter sections, together with two to four external
resistors, can generate all standard 2nd-order functions:
bandpass, lowpass, highpass, and notch (band
reject). Three of these functions are simultaneously
available. Fourth-order filters can be obtained by cascading
the two 2nd-order filter sections. Similarly, higher
order filters can easily be created by cascading
multiple MAX7490/MAX7491s.
Two clocking options are available: self-clocking
(through the use of an external capacitor) or external
clocking for tighter cutoff frequency control. The clock-to-center frequency ratio is 100:1. Sampling is done at
twice the clock frequency, further separating the cutoff
frequency and Nyquist frequency.
The MAX7490/MAX7491 have an internal rail splitter
that establishes a precise common voltage needed for
single-supply operation. The MAX7490 operates from a
single +5V supply and the MAX7491 operates from a
single +3V supply. Both devices feature a low-power
shutdown mode and come in a 16-pin QSOP package.
Key Features
Applications/Uses
Dual 2nd-Order Filter in a 16-Pin QSOP Package
High Accuracy
Q Accuracy: ±0.2%
Clock-to-Center Frequency Error: ±0.2%
Rail-to-Rail Input and Output Operation
Single-Supply Operation: +5V (MAX7490) or +3V (MAX7491)
Internal or External Clock
Highpass, Lowpass, Bandpass, and Notch Filters
Clock-to-Center Frequency Ratio of 100:1
Internal Sampling-to-Center Frequency Ratio of 200:1
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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