MAX7426 查看數據表（PDF） - Maxim Integrated

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MAX7426

5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Maxim Integrated 

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

V+

INPUT IN

VDD SHDN *

OUT OUTPUT

COM

MAX7426

MAX7427

V+

CLOCK CLK

OS

V-

0.1µF

0.1µF

GND

V-

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

Figure 4. Dual-Supply Operation

Characteristics table for the input voltage range of COM

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

cantly from midsupply reduces the dynamic range.

Power Supplies

The MAX7426 operates from a single +5V supply, and

the MAX7427 operates from a single +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 4

shows an example of dual-supply operation. Single-

supply and dual-supply performance are equivalent.

For either single-supply or dual-supply operation, drive

CLK and SHDN from GND (V- in dual-supply operation)

to VDD. Use the MAX7427 for ±2.5, and use the

MAX7426 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 MAX7426/MAX7427 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.

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. Table 2 lists

typical harmonic distortion values with a 10kΩ load at

TA = +25°C.

Chip Information

TRANSISTOR COUNT: 1457

PROCESS: BiCMOS

Table 2. Typical Harmonic Distortion

FILTER

fCLK

(kHz)

fIN

(Hz)

500

1k

MAX7426

100

200

500

1k

MAX7427

100

200

VIN

(Vp-p)

4

2

TYPICAL HARMONIC DISTORTION (dB)

2nd

3rd

4th

5th

-71

-73

-90

-82

-88

-86

-92

-88

-87

-86

-90

-90

-90

-87

-90

-90

10 ______________________________________________________________________________________

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