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MAX7490 Datasheet(数据表) 1 Page - Maxim Integrated Products |
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MAX7490 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 page 
General Description 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 func- tions: bandpass, lowpass, highpass, and notch (band reject). Three of these functions are simultaneously available. Fourth-order filters can be obtained by cas- cading the two 2nd-order filter sections. Similarly, high- er 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. ________________________Applications Tunable Active Filters Multipole Filters ADC Anti-Aliasing Post-DAC Filtering Adaptive Filtering Phase-Locked Loops (PLLs) Set-Top Boxes Features o Dual 2nd-Order Filter in a 16-Pin QSOP Package o High Accuracy Q Accuracy: ±0.2% Clock-to-Center Frequency Error: ±0.2% o Rail-to-Rail Input and Output Operation o Single-Supply Operation: +5V (MAX7490) or +3V (MAX7491) o Internal or External Clock o Highpass, Lowpass, Bandpass, and Notch Filters o Clock-to-Center Frequency Ratio of 100:1 o Internal Sampling-to-Center Frequency Ratio of 200:1 o Center Frequency up to 40kHz o Easily Cascaded for Multipole Filters o Low-Power Shutdown: <1µA Supply Current Dual Universal Switched-Capacitor Filters ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 LPA LPB BPB NB/HPB INVB SB COM EXTCLK CLK TOP VIEW MAX7490 MAX7491 QSOP BPA NA/HPA SHDN INVA SA GND VDD Pin Configuration 19-1768; Rev 0; 7/00 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Ordering Information Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. PART TEMP. RANGE PIN- PACKAGE SUPPLY VOLTAGE (+V) MAX7490CEE 0 °C to +70°C 16 QSOP 5 MAX7490EEE -40 °C to +85°C 16 QSOP 5 MAX7491CEE 0 °C to +70°C 16 QSOP 3 MAX7491EEE -40 °C to +85°C 16 QSOP 3 Typical Application Circuit appears at end of data sheet. |
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