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AD5737

Data Sheet

Rev. B | Page 20 of 44

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

Relative accuracy, or integral nonlinearity (INL), is a measure

of the maximum deviation from the best fit line through the

DAC transfer function. INL is expressed in percent of full-scale

range (% FSR). 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 DNL of ±1 LSB maximum ensures

monotonicity. The AD5737 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 AD5737 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.

It is expressed in % FSR.

Offset Error Drift or Offset TC

Offset error drift, or offset TC, is a measure of the change in

offset error with changes in temperature and is expressed in

ppm FSR/°C.

Gain Error

Gain error is a measure of the span error of the DAC. It is the

deviation in slope of the DAC transfer function from the ideal,

expressed in % FSR.

Gain Temperature Coefficient (TC)

Gain TC is a measure of the change in gain error with changes

in temperature and 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 % FSR.

Full-Scale Temperature Coefficient (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 (TUE)

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

that includes all the error measurements: INL error, offset error,

gain error, temperature, and time. TUE is expressed in % FSR.

DC Crosstalk

DC crosstalk 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 current loop compliance voltage is 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 AD5737 is powered on. It is specified as the

area of the glitch in nV-sec (see Figure 23).

Power Supply Rejection Ratio (PSRR)

PSRR indicates how the output of the DAC is affected by changes

in the power supply voltage.

Reference Temperature Coefficient (TC)

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

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

Line Regulation

Line regulation is the change in the 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 the reference output voltage due

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

DC-to-DC Converter Headroom

DC-to-DC converter headroom is the difference between the

voltage required at the current output and the voltage supplied

by the dc-to-dc converter (see Figure 30).

Output Efficiency

Output efficiency is defined as the ratio of the power delivered

to a channel’s load and 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.

LOAD

OUT

Efficiency at VBOOST_x

The efficiency at VBOOST_x is defined as the ratio of the power

delivered to a channel’s VBOOST_x supply and 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.

BOOST

OUT

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