Rainbow-electronics MAX545 Manual do Utilizador descarregar pdf (Página 7)

MAX544/MAX545

+5V, Serial-Input, Voltage-Output, 14-Bit DACs

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Detailed Description

The MAX544/MAX545 voltage-output, 14-bit digital-to-

analog converters (DACs) offer full 14-bit performance

with less than 0.5LSB integral linearity error and less

than 0.9LSB differential linearity error, thus ensuring

monotonic performance. Serial-data transfer minimizes

the number of package pins required.

The MAX544/MAX545 are composed of two matched

DAC sections, with an inverted R-2R DAC forming the

LSBs and the four MSBs derived from 15 identically

matched resistors. This architecture allows the lowest

glitch energy to be transferred to the DAC output on

major-carry transitions. It also lowers the DAC output

impedance by a factor of eight compared to a standard

R-2R ladder, allowing unbuffered operation in medium-

load applications.

The MAX545 provides matched bipolar offset resistors,

which connect to an external op amp for bipolar output

swings (Figure 2b). For optimum performance, the

MAX545 also provides a set of Kelvin connections to

the voltage-reference and analog-ground inputs.

MAX545

MAX400

AGNDFDGND

(GND)

REFF

REFS

INV

RFB

INV

OUT

LDAC

SCLK

DIN

AGNDS

0.1µF

+5V

EXTERNAL OP AMP

MC68XXXX

PCS0

MOSI

SCLK

IC1

BIPOLAR

OUT

+5V

-5V

0.1µF

+2.5V

10µF

Figure 2b. Typical Operating Circuit—Bipolar Output

MAX544/MAX545

MAX495

DGND

( ) ARE FOR MAX545 ONLY

(GND)

(REFS)REF (REFF)

OUT

SCLK

DIN

AGND_

0.1µF

+5V

+2.5V

EXTERNAL OP AMP

MC68XXXX

PCS0

MOSI

SCLK

UNIPOLAR

OUT

(LDAC)

10µF

Figure 2a. Typical Operating Circuit—Unipolar Output

1 2 3 4 5 6 7 8 9 10 11 12

MAX544/MAX545 1

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