Rainbow-electronics MAX5355 Bedienungsanleitung PDF herunterladen (Seite 13)

The MAX5354’s total harmonic distortion plus noise

(THD+N) is typically less than -77dB (full-scale code),

and the MAX5355’s THD+N is typically less than -72dB

(full-scale code), given a 1Vp-p signal swing and input

frequencies up to 25kHz. The typical -3dB frequency is

650kHz for both devices, as shown in the

Typical

Operating Characteristics

graphs.

Digitally Programmable Current Source

The circuit of Figure 12 places an NPN transistor

(2N3904 or similar) within the op-amp feedback loop

to implement a digitally programmable, unidirectional

current source. The output current is calculated with

the following equation:

OUT

= (V

REF

/R) x (NB/1024)

where NB is the numeric value of the DAC’s binary

input code and R is the sense resistor shown in

Figure 12.

MAX5354/MAX5355

10-Bit Voltage-Output DACs

in 8-Pin µMAX

______________________________________________________________________________________ 13

NOTE: ( ) are for sub-bits.

MAX5354

MAX5355

DAC

REF

OUT

GND

+5V/3.3V

Figure 8. Unipolar Output Circuit

Table 3. Bipolar Code Table

MAX5354

MAX5355

DAC

REF

OUT

10k

GND

+5V/+3.3V

Figure 9. Unipolar Rail-to-Rail Output Circuit

ANALOG OUTPUT

11 1111 1111 (000)

10 0000 0001 (000)

DAC CONTENTS

MSB LSB

10 0000 0000 (000) 0V

01 1111 1111 (000)

00 0000 0000 (000)

00 0000 0001 (000)

511

512

REF













512

REF













-V

512

REF













-V

511

512

REF













-V

512

- V

REF REF













1 2 ... 8 9 10 11 12 13 14 15 16

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