MAX1209 datasheet(22/27 Pages) MAXIM

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Buffered External Reference

Drives Multiple ADCs

The buffered external reference mode allows for more

control over the MAX1209 reference voltage and allows

multiple converters to use a common reference. The

REFIN input impedance is >50M

Ω.

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 MAX1209.

12-Bit, 80Msps, 3.3V IF-Sampling ADC

______________________________________________________________________________________

MAX1209

NOTE: ONE FRONT-END REFERENCE

CIRCUIT IS CAPABLE OF SOURCING 15mA

AND SINKING 30mA OF OUTPUT CURRENT.

*PLACE THE 1

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

16.2k

0.1

μF

0.1

μF

2.048V

+3.3V

1.47k

+3.3V

μF

330

μF

+3.3V

2.2

μF

2.2

μF

0.1

μF

μF*

μF

0.1

μF

0.1

μF

0.1

μF

REFP

REFN

COM

VDD

GND

REFIN

REFOUT

MAX1209

+3.3V

2.2

μF

2.2

μF

0.1

μF

μF*

μF

0.1

μF

0.1

μF

0.1

μF

REFP

REFN

COM

VDD

GND

REFIN

REFOUT

MAX6029EUK21

MAX4230

Figure 13. External Buffered Reference Driving Multiple ADCs

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