Eval-AD5570EB【PDF 10/24 页】True Accuracy, 16-Bit 12 V/15 V, Serial

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AD5570

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

Rev. 0 | Page 10 of 24

Relative accuracy or integral nonlinearity is a measure of the

maximum deviation, in LSBs, from a straight line passing

through the endpoints of the DAC transfer function.

Monotonicity

A DAC is monotonic, if the output either increases or remains

constant for increasing digital inputs. The AD5570 is monotonic

over its full operating temperature range.

Differential Nonlinearity (DNL)

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.

Gain Error

Gain error is the difference between the actual and ideal analog

output range, expressed as a percent of the full-scale range. It is

the deviation in slope of the DAC transfer characteristic from

the ideal.

Gain Error Temperature Coefficient

Gain error temperature coefficient is a measure of the change in

gain error with changes in temperature. It is expressed in

ppm/°C.

Negative Full-Scale Error / Zero Scale Error

Negative full-scale error is the error in the DAC output voltage

when all 0s are loaded into the DAC latch. Ideally, the output

voltage, with all 0s in the DAC latch, should be 2 V

REF

Full-Scale Error

Full-scale error is the error in the DAC output voltage when all

1s are loaded to the DAC latch. Ideally the output voltage, with

all 1s loaded into the DAC latch, should be 2 V

REF

1 LSB.

Bipolar Zero Error

Bipolar zero error is the deviation of the analog input from the

ideal half-scale output of 0.0000 V when the inputs are loaded

with 0x8000.

Output Voltage Settling Time

Output voltage settling time is the amount of time it takes for

the output to settle to a specified level for a full-scale input

change.

Slew Rate

The slew rate of a device is a limitation in the rate of change of

output voltage. The output slewing speed of a voltage-output

D/A converter is usually limited by the slew rate of the amplifier

used at its output. Slew rate is measured from 10% to 90% of the

output signal and is given in V/μs.

Digital-to-Analog Glitch Impulse

Digital-to-analog glitch impulse is the amount of charge in-

jected into the analog output when the input codes in the DAC

nV-s and is measured when the digital input code changes by

1 LSB at the major carry transition, that is, from code 0x7FFF to

0x8000.

Bandwidth

The reference amplifiers within the DAC have a finite band-

width to optimize noise performance. To measure it, a sine

wave is applied to the reference input (REFIN), with full-scale

code loaded to the DAC. The bandwidth is the frequency at

which the output amplitude falls to 3 dB below the input.

Digital Feedthrough

Digital feedthrough is a measure of the impulse injected into

the analog output of the DAC from the digital inputs of the

DAC, but is measured when the DAC output is not updated.

SYNC is held high, while the CLK and SDIN signals are toggled.

It is specified in nV-s and is measured with a full-scale code

change on the data bus, that is, from all 0s to all 1s and vice

versa.

Power Supply Sensitivity

Power supply sensitivity indicates how the output of the DAC is

affected by changes in the power supply voltage.

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