MAX12555ETL(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX12555ETL
(Rev.:2004)

14-Bit, 95Msps, 3.3V ADC

Maxim Integrated 

14-Bit, 95Msps, 3.3V ADC

+3.3V

2.2µF

0.1µF

0.1µF

+3.3V

1

2

MAX6029EUK21

0.1µF

5

2.048V

NOTE: ONE FRONT-END REFERENCE

CIRCUIT IS CAPABLE OF SOURCING 15mA

AND SINKING 30mA OF OUTPUT CURRENT.

+3.3V

0.1µF

16.2kΩ

1µF

1

MAX4230

5

4

47Ω

2.048V

3

2

10µF

6V

330µF

6V

VDD

38 REFOUT

REFP 1

0.1µF

1µF*

10µF

MAX12555

REFN 2

0.1µF

3

39 REFIN

COM

GND

2.2µF

+3.3V

2.2µF

0.1µF

0.1µF

1.47kΩ

*PLACE THE 1µF REFP-to-REFN BYPASS CAPACITOR AS CLOSE TO THE DEVICE AS POSSIBLE.

VDD

38 REFOUT

REFP 1

0.1µF

1µF*

10µF

MAX12555

REFN 2

0.1µF

3

39 REFIN

COM

GND

2.2µF

Figure 13. External Buffered Reference Driving Multiple ADCs

Buffered External Reference

Drives Multiple ADCs

The buffered external reference mode allows for more

control over the MAX12555 reference voltage and

allows multiple converters to use a common reference.

The REFIN input impedance is >50MΩ.

Figure 13 uses the MAX6029EUK21 precision 2.048V

reference as a common reference for multiple convert-

ers. The 2.048V output of the MAX6029 passes through

a one-pole 10Hz lowpass filter to the MAX4230. The

MAX4230 buffers the 2.048V reference and provides

additional 10Hz lowpass filtering before its output is

applied to the REFIN input of the MAX12555.

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