Rainbow-electronics MAX7491 Manual de usuario descargar pdf (Pagina 1)

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

♦ 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

♦ Center Frequency up to 40kHz

♦ Easily Cascaded for Multipole Filters

♦ Low-Power Shutdown: <1µA Supply Current

MAX7490/MAX7491

Dual Universal Switched-Capacitor Filters

________________________________________________________________ Maxim Integrated Products 1

LPA LPB

BPB

NB/HPB

INVB

COM

EXTCLK

CLK

TOP VIEW

MAX7490

MAX7491

QSOP

BPA

NA/HPA

SHDN

INVA

GND

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.

1 2 3 4 5 6 ... 17 18

MAX7490/MAX7491 1

Indice de contenidos

Pagina 1 - MAX7490/MAX7491

General DescriptionThe MAX7490/MAX7491 consist of two identical low-power, low-voltage, wide dynamic range, Rail-to-Rail®,2nd-order switched-capacitor

Pagina 2

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters10 ______________________________________________________________________________________Table

Pagina 3

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters______________________________________________________________________________________ 11have

Pagina 4

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters12 ______________________________________________________________________________________Mode

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MAX7490/MAX7491Dual Universal Switched-Capacitor Filters______________________________________________________________________________________ 13Mode

Pagina 6

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters14 ______________________________________________________________________________________Mode

Pagina 7

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters______________________________________________________________________________________ 15Input

Pagina 8

Wideband NoiseThe wideband noise of the filter is the total RMS valueof the device’s noise spectral density and is used todetermine the operating SNR.

Pagina 9

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters______________________________________________________________________________________ 17NB/HP

Pagina 10

MAX7490/MAX7491Dual Universal Switched-Capacitor FiltersMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embo

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MAX7490/MAX7491Dual Universal Switched-Capacitor Filters2 _______________________________________________________________________________________ABSOL

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MAX7490/MAX7491Dual Universal Switched-Capacitor Filters_______________________________________________________________________________________ 3PARAM

Pagina 13

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters4 _______________________________________________________________________________________PARAM

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MAX7490/MAX7491Dual Universal Switched-Capacitor Filters_______________________________________________________________________________________ 5PARAM

Pagina 15

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters6 _______________________________________________________________________________________-0.6-

Pagina 16

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters_______________________________________________________________________________________ 7-20-1

Pagina 17

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters8 ____________________________________________________________________________________________

Pagina 18

MAX7490/MAX7491Dual Universal Switched-Capacitor Filters_______________________________________________________________________________________ 92nd-O

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