AD5441

Preliminary Technical Data

Rev. PrA | Page 10 of 16

TERMINOLOGY

Relative Accuracy

Relative accuracy or endpoint nonlinearity is a measure of the

maximum deviation from a straight line passing through the

endpoints of the DAC transfer function. It is measured after

adjusting for zero and full scale and is normally expressed in

LSBs or as a percentage of the full-scale reading.

Differential Nonlinearity

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

over the operating temperature range ensures monotonicity.

Gain Error

Gain error or full-scale error is a measure of the output error

between an ideal DAC and the actual device output. For these

DACs is adjustable to zero with external resistance.

Zero Scale Error

Output Leakage Current

Output leakage current is the current that flows into the DAC

it can be measured by loading all 0s to the DAC and measuring

Output Capacitance

Digital-to-Analog Glitch Impulse

The amount of charge injected from the digital inputs to the

analog output when the inputs change state. This is normally

specified as the area of the glitch in either pA-s or nV-s,

depending on whether the glitch is measured as a current or

voltage signal.

Digital Feedthrough

When the device is not selected, high frequency logic activity

on the device’s digital inputs may be capacitively coupled

noise is coupled from the outputs of the device onto follow-on

circuitry. This noise is digital feedthrough.

Multiplying Feedthrough Error

This is the error due to capacitive feedthrough from the DAC

loaded to the DAC.

Total Harmonic Distortion (THD)

The DAC is driven by an ac reference. The ratio of the rms sum

of the harmonics of the DAC output to the fundamental value is

the THD. Usually only the lower order harmonics, such as

second to fifth, are included.

1

2

5

2

4

2

3

2

2

V

V

V

V

V

log

20

+

+

+

=

THD

Compliance Voltage Range

The maximum range of (output) terminal voltage for which the

device will provide the specified characteristics.

Output Noise Spectral Density

Calculation from

where:

K = Boltzmann Constant (J/°K)

R = Resistance (Ω)

T = Resistor temperature (°K)

B = 1 Hz bandwidth