AD5380 datasheet(14/34 Pages) AD

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PRELIMINARY TECHNICAL DATA

REV. PrF 09/2003

–14–

AD5380

TERMINOLOGY

Relative Accuracy

Relative accuracy or endpoint linearity is a measure of the

maximum deviation from a straight line passing through

the endpoints of the DAC transfer function.

It is

measured after adjusting for zero-scale error and full-scale

error and is expressed in Least Significant Bits.

Differential Nonlinearity

Differential nonlinearity is the difference between the

measured change and the ideal 1 LSB change between any

two adjacent codes.

A specified differential nonlinearity of

1 LSB maximum ensures monotonicity.

Zero-Scale Error

Zero-scale error is the error in the DAC output voltage

when all 0s are loaded into the DAC register.

Ideally, with all 0s loaded to the DAC and m = all 1s, c =

n-1:

VOUT(Zero-Scale) = 0V

Zero-scale error is a measure of the difference between

VOUT (actual) and VOUT (ideal) expressed in mV. It is

mainly due to offsets in the output amplifier.

Offset-Error

Offset error is a measure of the difference between VOUT

(actual) and VOUT (ideal) expressed in mV in the linear

region of the transfer function. Offset error is measured on

the AD5380-5 with Code 32 loaded into the DAC register

and with code 64 on the AD5380-3.

Gain Error

Gain Error is specified in the linear region of the ouput

range between Vout =10mV and Vout =AVdd-50mV. It is

the deviation in slope of the DAC transfer characteristic

from ideal and is expressed in % FSR with the DAC

output unloaded.

DC Crosstalk

This is the DC change in the output level of one DAC at

midscale in response to a fullscale code (all 0’s to all 1’s

and vice versa) and output change of all other DACs. It is

expressed in lsbs.

DC Output Impedance

This is the effective output source resistance.

It is

dominated by package lead resistance.

Output Voltage Settling Time

This is the amount of time it takes for the output of a

DAC to settle to a specified level for a 1/4 to 3/4 full-scale

input change and measured from

BUSY rising edge.

Digital-to-Analog Glitch Energy

This is the amount of energy injected into the analog

output at the major code transition. It is specified as the

area of the glitch in nV-s. It is measured by toggling the

DAC register data between 1FFF Hex and 2000Hex.

DAC-to-DAC Crosstalk

DAC-to-DAC crosstalk is defined as the glitch impulse

that appears at the output of one DAC output due to both

the digital change and subsequent analog O/P change at

another DAC. The victim channel is loaded with mid-

scale and DAC-to-DAC crosstalk is specified in nV-s.

Digital Crosstalk

The glitch impulse transferred to the output of one

converter due to a change in the DAC register code of

another converter is defined as the digital crosstalk and is

specified in nV-s.

Digital Feedthrough

When the device is not selected, high frequency logic

activity on the device’s digital inputs can be capacitively

coupled both across and through the device to show up as

noise on the VOUT pins. It can also be coupled along the

supply and ground lines. This noise is digital feedthrough.

Output Noise Spectral Density

This is a measure of internally generated random noise.

Random noise is characterized as a spectral density (voltage

per root Hertz). It is measured by loading all DACs to

midscale and measuring noise at the output. It is

measured in nV/(Hz)

1/2 in a 1 Hz bandwidth at 10KHz.

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