EVAL-AD5533EB【PDF 9/16 页】32-Channel Precision Infinite Sample-and

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REV. A

AD5533B

–9–

TERMINOLOGY

to V

OUT

Nonlinearity

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

passing through the endpoints of the V

versus V

OUT

transfer

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

Total Unadjusted Error (TUE)

This is a comprehensive specification that includes relative accu-

racy, gain, and offset errors. It is measured by sampling a range

of voltages on V

and comparing the measured voltages on

OUT

to the ideal value. It is expressed in mV.

Offset Error

This is a measure of the output error when V

= 70 mV. Ideally,

with V

= 70 mV:

Gain

OUT

(

)

((

Offset error is a measure of the difference between

OUT

(actual)

and

OUT

(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:

OFFS IN

)

Gain Error

Ideal Full ScaleOutput Offset

Actual Full ScaleOutput

Error

where

Ideal Full Scale Output

Gain

(

Gain

((

OFFS

)

2 96

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/

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

and V

). It is expressed in dBs. V

and V

are varied

5%.

DC Crosstalk

This is 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

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 V

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

voltage on OFFS_IN until the output has settled to within

0.39%.

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.,

SYNC

is high. It is specified in nV-secs and is measured

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 acquiring 1.5 V on all channels and measuring

noise at the output. It is measured in nV/

√

typ.

AC Crosstalk

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

nel while another channel is acquiring. It is expressed in nV-secs.

2.96

70mV

OUT

IDEAL

TRANSFER

FUNCTION

ACTUAL

TRANSFER

FUNCTION

OFFSET

ERROR

GAIN ERROR +

OFFSET ERROR

UPPER

DEAD BAND

LOWER

DEAD BAND

Figure 5. ISHA Transfer Function

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