Rainbow-electronics MAX1444 Manual do Utilizador descarregar pdf (Página 14)

MAX1444

10-Bit, 40Msps, +3.0V, Low-Power

ADC with Internal Reference

14 ______________________________________________________________________________________

duce the highest level of signal integrity. Consider

using a split ground plane arranged to match the physi-

cal location of the analog ground (GND) and the digital

output driver ground (OGND) on the ADC's package.

The two ground planes should be joined at a single

point so that the noisy digital ground currents do not

interfere with the analog ground plane. The ideal loca-

tion of this connection can be determined experimen-

tally at a point along the gap between the two ground

planes that produces optimum results. Make this con-

nection with a low-value, surface-mount resistor (1Ω to

5Ω), a ferrite bead, or a direct short. Alternatively, all

ground pins could share the same ground plane if the

ground plane is sufficiently isolated from any noisy, dig-

ital systems ground plane (e.g., downstream output

buffer or DSP ground plane). Route high-speed digital

signal traces away from sensitive analog traces. Keep

all signal lines short and free of 90° turns.

INPUT

300Ω

-5V

+5V

0.1µF

22pF

ISO

50Ω

ISO

50Ω

-5V

600Ω

300Ω

IN+

IN-

LOWPASS FILTER

COM

600Ω

+5V

-5V

0.1µF

600Ω

300Ω

600Ω

300Ω

0.1µF

+5V

0.1µF

300Ω

MAX4108

MAX1444

MAX4108

LOWPASS FILTER

Figure 7. Typical Application Circuit for Single-Ended to Differential Conversion

1 2 ... 9 10 11 12 13 14 15 16 17 18

ADC with Internal Reference 1

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