DAC7551_13 datasheet(11/22 Pages) TI1

No de pièce	DAC7551

Description	12-Bit, Ultra-Low Glitch, Voltage Output DIGITAL-TO-ANALOG CONVERTER

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Fabricant	TI1 [Texas Instruments]

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THEORY OF OPERATION

DIGITAL-TO-ANALOG CONVERTER

DAC

Register

REF(+)

ResistorString

REF( )

-

V

H

REF

V

OUT

50kW

100kW

V

FB

V

L

REF

RESISTOR STRING

V

REFH

V

REFL

R

V

REFH

V

L

-

REF

2

R

DIVIDER

ToOutputAmplifier

(2xGain)

DAC7551

SLAS441E – MARCH 2005 – REVISED APRIL 2007

The architecture of the DAC7551 consists of a string

DAC followed by an output buffer amplifier. Figure 26

shows a generalized block diagram of the DAC

architecture.

Figure 26. Typical DAC Architecture

The input coding to the DAC7551 is unsigned binary,

which gives the ideal output voltage as:

VOUT = 2 x VREFL + (VREFH – VREFL) x D/4096

Where D = decimal equivalent of the binary code that

is loaded to the DAC register, which ranges from 0 to

4095.

The resistor string section is shown in Figure 27. It is

simply a string of resistors, each of value R. The

digital code loaded to the DAC register determines at

which node on the string the voltage is tapped off to

Figure 27. Typical Resistor String

be fed into the output amplifier. The voltage is

tapped off by closing one of the switches connecting

the string to the amplifier. It is specified monotonic

because it is a string of resistors.

11

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