AD5757 datasheet(21/44 Pages) AD

21 / 44 page

AD5757

Rev. A | Page 21 of 44

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy, or integral nonlinearity, is a

measure of the maximum deviation, in LSBs, from the best fit

line through the DAC transfer function. A typical INL vs. code

plot is shown in Figure 8.

Differential Nonlinearity (DNL)

Differential nonlinearity (DNL) 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. This DAC is guaranteed

monotonic by design. A typical DNL vs. code plot is shown in

Figure 9.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5757 is

monotonic over its full operating temperature range.

Offset Error

Offset error is the deviation of the analog output from the ideal

zero-scale output when all DAC registers are loaded with

0x0000.

Gain Error

This is a measure of the span error of the DAC. It is the devia-

tion in slope of the DAC transfer characteristic from the ideal,

expressed in % FSR.

Gain TC

This is a measure of the change in gain error with changes in

temperature. Gain TC is expressed in ppm FSR/°C.

Full-Scale Error

Full-Scale error is a measure of the output error when full-scale

code is loaded to the DAC register. Ideally, the output should be

full-scale − 1 LSB. Full-scale error is expressed in percent of

full-scale range (% FSR).

Full-Scale TC

Full-scale TC is a measure of the change in full-scale error with

changes in temperature and is expressed in ppm FSR/°C.

Total Unadjusted Error

Total unadjusted error (TUE) is a measure of the output error

taking all the various errors into account, including INL error,

offset error, gain error, temperature, and time. TUE is expressed

in % FSR.

DC Crosstalk

This is the dc change in the output level of one DAC in response

to a change in the output of another DAC. It is measured with a

full-scale output change on one DAC while monitoring another

DAC, which is at midscale.

Current Loop Compliance Voltage

The maximum voltage at the IOUT_x pin for which the output

current is equal to the programmed value.

Voltage Reference Thermal Hysteresis

Voltage reference thermal hysteresis is the difference in output

voltage measured at +25°C compared to the output voltage

measured at +25°C after cycling the temperature from +25°C to

−40°C to +105°C and back to +25°C. The hysteresis is specified

for the first and second temperature cycles and is expressed in ppm.

Power-On Glitch Energy

Power-on glitch energy is the impulse injected into the analog

output when the AD5757 is powered-on. It is specified as the area

of the glitch in nV-sec. See Figure 24.

Power Supply Rejection Ratio (PSRR)

PSRR indicates how the output of the DAC is affected by

changes in the power supply voltage.

Reference TC

Reference TC is a measure of the change in the reference output

voltage with a change in temperature. It is expressed in ppm/°C.

Line Regulation

Line regulation is the change in reference output voltage due to

a specified change in supply voltage. It is expressed in ppm/V.

Load Regulation

Load regulation is the change in reference output voltage due to

a specified change in load current. It is expressed in ppm/mA.

DC-to-DC Converter Headroom

This is the difference between the voltage required at the

current output and the voltage supplied by the dc-to-dc

converter. See Figure 31.

Output Efficiency

LOAD

OUT

This is defined as the power delivered to a channel’s load vs. the

power delivered to the channel’s dc-to-dc input.

Efficiency at VBOOST_x

BOOST

OUT

This is defined as the power delivered to a channel’s VBOOST_x

supply vs. the power delivered to the channel’s dc-to-dc input.

The VBOOST_x quiescent current is considered part of the dc-to-

dc converter’s losses.

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