AD5533 datasheet(9/16 Pages) AD

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AD5533

–9–

REV. 0

TERMINOLOGY

VIN to VOUT Nonlinearity

This is a measure of the maximum deviation from a straight line

passing through the endpoints of the VIN versus VOUT transfer

function. It is expressed as a percentage of the full-scale span.

Offset Error

This is a measure of the output error when VIN = 70 mV. Ideally,

with VIN = 70 mV:

VOUT = (Gain

× 70) – ((Gain – 1) × VOFFS_IN) mV

Offset error is a measure of the difference between VOUT (actual)

and VOUT (ideal). It is expressed in mV and can be positive or

negative. See Figure 5.

Gain Error

This is a measure of the span error of the analog channel. It is

the deviation in slope of the transfer function. See Figure 5. It

is calculated as:

Gain Error = Actual Full-Scale Output – Ideal Full-Scale Output –

Offset Error

where

Ideal Full-Scale Output = Ideal Gain

× 2.96 – ((Ideal Gain-1) × VOFFS_IN)

Ideal Gain = 3.52

Output Temperature Coefﬁcient

This is a measure of the change in analog output with changes

in temperature. It is expressed in ppm/

°C.

DC Power-Supply Rejection Ratio

DC Power-Supply Rejection Ratio (PSRR) is a measure of the

change in analog output for a change in supply voltage (VDD

and VSS). It is expressed in dBs. VDD and VSS are varied

±5%.

DC Crosstalk

This the dc change in the output level of one channel in response

to a full-scale change in the output of all other channels. It is

expressed in

µV.

Output Settling Time

This is the time taken from when

BUSY goes high to when the

output has settled to

±0.018%.

Acquisition Time

This is the time taken for the VIN input to be acquired. It is the

length of time that

BUSY stays low.

OFFS_IN Settling Time

This is the time taken from a 0 V–3 V step change in input volt-

age on OFFS_IN until the output has settled to within

±0.35%.

Digital Feedthrough

This is a measure of the impulse injected into the analog outputs

from the digital control inputs when the part is not being written

to, i.e.,

CS/SYNC is high. It is speciﬁed in nV-secs and is mea-

sured with a worst-case change on the digital input pins, e.g.,

from all 0s to all 1s and vice versa.

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.

AC Crosstalk

This is the area of the glitch that occurs on the output of one

channel while another channel is acquiring. It is expressed in

nV-secs.

2.96

70mV

VOUT

IDEAL

TRANSFER

FUNCTION

ACTUAL

TRANSFER

FUNCTION

OFFSET

ERROR

GAIN ERROR +

OFFSET ERROR

VIN

UPPER

DEADBAND

LOWER

DEADBAND

Figure 5. SHA Transfer Function

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