XRD8775 查看數據表（PDF） - Exar Corporation

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XRD8775

CMOS 8-Bit High Speed Analog-to-Digital Converter

Exar Corporation 

XRD8775

APPLICATION NOTES

Signals should not exceed AVDD +0.5V or go below

AGND -0.5V or DVDD +0.5V or DGND -0.5V. All pins

have internal protection diodes that will protect them

from short transients (<100µs) outside the supply

range.

AGND and DGND pins are connected internally through

the P- substrate. DC voltage differences between these

pins will cause undesirable internal substrate currents.

The power supply (AVDD) and reference voltage (VRT &

VRB) pins should be decoupled with 0.1µF and 10µF

capacitors to AGND, placed as close to the chip as

possible.

The digital outputs should not drive long wires or buses.

The capacitive coupling and reflections will contribute

noise to the conversion.

To avoid timing errors, use the rising edge of the sample

clock (CLK) to latch data from the XRD8775 to other

parts of the system.

The reference can be biased internally by shorting VRT

to VRTS and VRB to VRBS. This will generate 0.6V at VRB

and 2.6V at VRT (see Figure 5.).

If the internal reference pins VRTS and/or VRBS are not

used they should be left unconnected.

1.0

0.8

0.6

0.4

0.2

0.0

-0.2

-0.4

-0.6

-0.8

-1.0

0

Vdd = 5.0V

Vrt = 2.6V

Vrb = 0.6V

Fs = 15MHz

Ta = 25 oC

32

64

96

128

160

192

224

256

Code

Graph 1. DNL vs. Code

Rev. 4.00

6

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