DAC8563 datasheet(28/63 Pages) TI2

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O UT

REF

Gain

DAC

Gain

REF(+)

Resistor String

REF( )

GND

REFIN

REFOUT

OUT

150 kW

DAC756x (12-Bit)

DAC816x (14-Bit)

DAC856x (16-Bit)

Buffer Control

Control Logic

Power-

Down

Control

Logic

REFIN

REFOUT

CLR

LDAC

2.5-V

Reference

OUT

GND

DAC

Input Control Logic

SYNC

SCLK

Data Buffer A

Data Buffer B

DAC Register A

DAC Register B

DAC7562, DAC7563, DAC8162

DAC8163, DAC8562, DAC8563

SLAS719E – AUGUST 2010 – REVISED JUNE 2015

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8 Detailed Description

8.1 Overview

The DAC756x, DAC816x, and DAC856x devices are low-power, voltage-output, dual-channel, 16-, 14-, and

12-bit digital-to-analog converters (DACs), respectively. These devices include a 2.5-V, 4-ppm/°C internal

reference, giving a full-scale output voltage range of 2.5 V or 5 V. The internal reference has an initial accuracy

of ±5 mV and can source or sink up to 20 mA at the VREFIN/VREFOUT pin.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Digital-to-Analog Converter (DAC)

The DAC756x, DAC816x, and DAC856x architecture consists of two string DACs, each followed by an output

buffer amplifier. The devices include an internal 2.5-V reference with 4-ppm/°C temperature drift performance.

Figure 88 shows a principal block diagram of the DAC architecture.

Figure 88. DAC Architecture

The input coding to the DAC756x, DAC816x, and DAC856x devices is straight binary, so the ideal output voltage

is given by Equation 1:

(1)

where:

n = resolution in bits; either 12 (DAC756x), 14 (DAC816x) or 16 (DAC856x)

DIN = decimal equivalent of the binary code that is loaded to the DAC register. DIN ranges from 0 to 2

n – 1.

VREF = DAC reference voltage; either VREFOUT from the internal 2.5-V reference or VREFIN from an

aaa external reference.

Gain = 1 by default when internal reference is disabled (using external reference), and gain = 2 by default

aaa when using internal reference. Gain can also be manually set to either 1 or 2 using the gain register.

aaa See the Gain Function section for more information.

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Product Folder Links: DAC7562 DAC7563 DAC8162 DAC8163 DAC8562 DAC8563

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