MAX7409 查看數據表（PDF） - Maxim Integrated

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MAX7409

5th-Order, Lowpass, Switched-Capacitor Filters

Maxim Integrated 

5th-Order, Lowpass,

Switched-Capacitor Filters

Typical Operating Characteristics (continued)

(VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C,

unless otherwise noted.)

OUTPUT OFFSET VOLTAGE

vs. TEMPERATURE

-3.00

OUTPUT OFFSET VOLTAGE

vs. SUPPLY VOLTAGE

-2.0

-3.25

-2.5

-3.50

VDD = +3V

-3.0

-3.75

-3.5

VDD = +5V

-4.00

-4.0

-4.25

-4.5

-4.50

-40 -20

0 20 40 60

TEMPERATURE (°C)

80 100

-5.0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

Pin Description

PIN NAME

FUNCTION

1

COM

Common Input Pin. Biased internally at midsupply. Bypass COM externally to GND with a 0.1µF capacitor.

To override internal biasing, drive COM with an external supply.

2

IN

Filter Input

3

GND Ground

4

VDD

Positive Supply Input: +5V for MAX7409/MAX7410, +3V for MAX7413/MAX7414.

5

OUT Filter Output

Offset Adjust Input. To adjust output offset, connect OS to an external supply through a resistive voltage-

6

OS

divider (Figure 3). Connect OS to COM if no offset adjustment is needed. Refer to the Offset and Common-

Mode Input Adjustment section.

7

SHDN Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation.

8

CLK

Clock Input. Connect an external capacitor (COSC) from CLK to ground: fOSC (kHz) = 30 x 103 / COSC (pF).

To override the internal oscillator, connect CLK to an external clock: fC = fCLK /100.

_______________Detailed Description

The MAX7409/MAX7413 Bessel filters provide low over-

shoot and fast settling responses, and the MAX7410/

MAX7414 Butterworth filters provide a maximally flat

passband response. All parts operate with a 100:1

clock-to-corner frequency ratio and a 15kHz maximum

corner frequency.

Bessel Characteristics

Lowpass Bessel filters such as the MAX7409/MAX7413

delay all frequency components equally, preserving the

shape of step inputs (subject to the attenuation of the

higher frequencies). Bessel filters settle quickly—an

important characteristic in applications that use a multi-

plexer (mux) to select an input signal for an analog-to-

digital converter (ADC). An anti-aliasing filter placed

between the mux and the ADC must settle quickly after

a new channel is selected.

Butterworth Characteristics

Lowpass Butterworth filters such as the MAX7410/

MAX7414 provide a maximally flat passband response,

making them ideal for instrumentation applications that

require minimum deviation from the DC gain throughout

the passband.

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