Digitally Controlled Analog I/O Processor

17

MX839 PRELIMINARY INFORMATION

© 1998 MX

xCOM Inc.

www.mxcom.com Tele: 800 638-5577 336 744-5050

Fax: 336 744-5054

Doc. # 20480164.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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Operating Characteristics Notes:

1.

Measured over a 0 to 30kHz Band.

2.

The extremes of the DAC output range (when resistively loaded) is affected by the output impedance of the DAC

buffer. Under these conditions, the output impedance can approach 200

:. However; when the output is operating

well within the supply; the output impedance will be significantly lower, thereby improving the loaded performance.

3.

4.

Loads less than 1k

: will produce output distortion.

5.

6.

Differential non-linearity is defined as the difference in width between adjacent code midpoints and the width of an

ideal LSB, divided by the width of an ideal LSB. See Figure 3.

7.

Integral non-linearity is defined as the width difference between an actual code midpoint and the line of best fit

through all code midpoints, divided by the width of an ideal LSB. See Figure 4.

8.

frequency.

Analog

Output

Digital

Input

Ideal

Response

Actual Response

Code Width=2LSBs

Differential Non-Linearity=1LSB

0V

000$

To $2FF

To

Figure 3: Differential Non-Linearity of a D/A Converter

000

040

080

0C0

Analog

Output

100

140

180

1C0 200

240

280

2FF

0/768

64/768

128/768

192/768

256/768

320/768

384/768

448/768

512/768

576/768

640/768

704/768

768/768

Digital

Input

5 LSBs

Ideal

Response

Actual Response

Figure 4: Integral Non-Linearity of a D/A Converter