Rainbow-electronics MAX1209 Bedienungsanleitung PDF herunterladen (Seite 23)

Unbuffered External

Reference Drives Multiple ADCs

The unbuffered external reference mode allows for pre-

cise control over the MAX1209 reference and allows

multiple converters to use a common reference.

Connecting REFIN to GND disables the internal refer-

ence, allowing REFP, REFN, and COM to be driven

directly by a set of external reference sources.

Figure 14 uses the MAX6029EUK30 precision 3.000V

reference as a common reference for multiple convert-

ers. A five-component resistive divider chain follows the

MAX6029 voltage reference. The 0.47µF capacitor along

this chain creates a 10Hz lowpass filter. Three MAX4230

operational amplifiers buffer taps along this resistor

MAX1209

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

______________________________________________________________________________________ 23

MAX1209

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

0.1µF

2.157V

+3.3V

47Ω

1.47kΩ

+3.3V

10µF

330µF

+3.3V

2.2µF

0.1µF

1µF*

10µF

0.1µF

REFOUT

REFN

REFIN

GND

COM

REFP

MAX6066

MAX4230

0.1µF

0.47µF

1.649V

47Ω

1.47kΩ

+3.3V

10µF

330µF

MAX4230

0.1µF

1.141V

47Ω

1.47kΩ

+3.3V

10µF

330µF

MAX4230

MAX1209

+3.3V

2.2µF

0.1µF

1µF*

10µF

0.1µF

REFOUT

REFN

REFIN

GND

COM

REFP

3.000V

24.3kΩ

20kΩ

26.7kΩ

20kΩ

2.2µF

Figure 14. External Unbuffered Reference Driving Multiple ADCs

1 2 ... 18 19 20 21 22 23 24 25 26 27

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