DAC714HC datasheet(6/14 Pages) BURR-BROWN

Nome de Peças	DAC714HC

Descrição Electrónicos	16-Bit DIGITAL-TO-ANALOG CONVERTER With Serial Data Interface

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Fabricante Electrônico	BURR-BROWN [Burr-Brown (TI)]

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®

DAC714

DISCUSSION OF

SPECIFICATIONS

LINEARITY ERROR

Linearity error is defined as the deviation of the analog

output from a straight line drawn between the end points of

the transfer characteristic.

DIFFERENTIAL LINEARITY ERROR

Differential linearity error (DLE) is the deviation from

1LSB of an output change from one adjacent state to the

next. A DLE specification of

±1/2LSB means that the output

step size can range from 1/2LSB to 3/2LSB when the digital

input code changes from one code word to the adjacent code

word. If the DLE is more positive than –1LSB, the D/A is

said to be monotonic.

MONOTONICITY

A D/A converter is monotonic if the output either increases

or remains the same for increasing digital input values.

Monotonicity of the C and L grades is guaranteed over the

specification temperature range to 16 bits.

SETTLING TIME

Settling time is the total time (including slew time) for the

D/A output to settle to within an error band around its final

value after a change in input. Settling times are specified to

within

±0.003% of Full Scale Range (FSR) for an output

step change of 20V and 1LSB. The 1LSB change is mea-

sured at the Major Carry (FFFFH to 0000H, and 0000H to

FFFFH: BTC codes), the input transition at which worst-case

settling time occurs.

TOTAL HARMONIC DISTORTION

Total harmonic distortion is defined as the ratio of the

square root of the sum of the squares of the values of the

harmonics to the value of the fundamental frequency. It is

expressed in % of the fundamental frequency amplitude at

sampling rate fS.

SIGNAL-TO-NOISE

AND DISTORTION RATIO (SINAD)

SINAD includes all the harmonic and outstanding spurious

components in the definition of output noise power in

addition to quantizing and internal random noise power.

SINAD is expressed in dB at a specified input frequency and

sampling rate, fS.

DIGITAL-TO-ANALOG GLITCH IMPULSE

The amount of charge injected into the analog output from

the digital inputs when the inputs change state. It is mea-

sured at half scale at the input codes where as many as

possible switches change state—from 0000H to FFFFH.

DIGITAL FEEDTHROUGH

When the A/D is not selected, high frequency logic activity

on the digital inputs is coupled through the device and shows

up as output noise. This noise is digital feedthrough.

OPERATION

The DAC714 is a monolithic integrated-circuit 16-bit D/A

converter complete with 16-bit D/A switches and ladder

network, voltage reference, output amplifier and a serial

interface.

INTERFACE LOGIC

The DAC714 has double-buffered data latches. The input

data latch holds a 16-bit data word before loading it into the

second latch, the D/A latch. This double-buffered organiza-

tion permits simultaneous update of several D/A converters.

All digital control inputs are active low. Refer to the block

diagram shown in Figure 1.

All latches are level-triggered. Data present when the enable

inputs are logic “0” will enter the latch. When the enable

inputs return to logic “1”, the data is latched.

The CLR input resets both the input latch and the D/A latch

to 0000H (midscale).

LOGIC INPUT COMPATIBILITY

The DAC714 digital inputs are TTL compatible (1.4V switch-

ing level), low leakage, and high impedance. Thus the inputs

are suitable for being driven by any type of 5V logic Family,

such as CMOS. An equivalent circuit for the digital inputs

is shown in Figure 2.

The inputs will float to logic “0” if left unconnected. It is

recommended that any unused inputs be connected to DCOM

to improve noise immunity.

Digital inputs remain high impedance when power is off.

INPUT CODING

The DAC714 is designed to accept binary two’s comple-

ment (BTC) input codes with the MSB first which are

compatible with bipolar analog output operation. For this

configuration, a digital input of 7FFFH produces a plus full

scale output, 8000H produces a minus full scale output, and

0000H produces bipolar zero output.

INTERNAL REFERENCE

The DAC714 contains a +10V reference. The reference

output may be used to drive external loads, sourcing up to

2mA. The load current should be constant, otherwise the

gain and bipolar offset of the converter will vary.

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