MAX7424CUA データシートの表示（PDF） - Maxim Integrated

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MAX7424CUA

5th-Order, Lowpass, Switched-Capacitor Filters

Maxim Integrated 

5th-Order, Lowpass,

Switched-Capacitor Filters

and OS. Changing the voltage on COM or OS signifi-

cantly from midsupply reduces the dynamic range.

Power Supplies

The MAX7418–MAX7421 operate from a single +5V

supply and the MAX7422–MAX7425 operate from a sin-

gle +3V supply. Bypass VDD to GND with a 0.1µF

capacitor. If dual supplies are required, connect COM

to the system ground and GND to the negative supply.

Figure 5 shows an example of dual-supply operation.

Single-supply and dual-supply performance are equiv-

alent. For either single-supply or dual-supply operation,

drive CLK and SHDN from GND (V- in dual supply

operation) to VDD. Use the MAX7418–MAX7421 for

±2.5, and use the MAX7422–MAX7425 for ±1.5V. For

±5V dual-supply applications, refer to the MAX291/

MAX292/MAX295/MAX296 and MAX293/MAX294/

MAX297 data sheets.

Input Signal Amplitude Range

The optimal input signal range is determined by observ-

ing the voltage level at which the signal-to-noise plus

distortion (SINAD) ratio is maximized for a given corner

frequency. The Typical Operating Characteristics show

the THD + Noise response as the input signal’s peak-to-

peak amplitude is varied.

Anti-Aliasing and Post-DAC Filtering

When using the MAX7418–MAX7425 for anti-aliasing or

post-DAC filtering, synchronize the DAC (or ADC) and

the filter clocks. If the clocks are not synchronized, beat

frequencies may alias into the desired passband.

V+

INPUT IN

VDD SHDN *

OUT OUTPUT

COM

MAX7418–

MAX7425

V+

CLOCK CLK

OS

V-

0.1µF

0.1µF

GND

V-

*CONNECT SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.

Figure 5. Dual-Supply Operation

Harmonic Distortion

Harmonic distortion arises from nonlinearities within the

filter. These nonlinearities generate harmonics when a

pure sine wave is applied to the filter input. Tables 1, 2,

and 3 list typical harmonic distortion values with a 10kΩ

load at TA = +25°C.

Table 1. MAX7418/MAX7421/MAX7422/MAX7425 Typical Harmonic Distortion

FILTER

MAX7418

MAX7421

MAX7422

MAX7425

fCLK

(MHz)

2.2

1.5

2.2

1.5

4.0

2.2

4.0

2.2

fIN

(kHz)

2

2

2

2

4

2

4

2

VIN

(Vp-p)

4

4

2

2

TYPICAL HARMONIC DISTORTION (dB)

2nd

3rd

4th

5th

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<-80

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<-80

<-80

12 ______________________________________________________________________________________

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