Data Sheet

AD45335

TERMINOLOGY

analog.com

Rev. 0 | 11 of 16

Integral Nonlinearity (INL)

A measure of the maximum deviation from a straight line passing

through the endpoints of the DAC transfer function.

It is expressed as a percentage of full-scale range.

Differential Nonlinearity (DNL)

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.

Zero Code Voltage

A measure of the output voltage present at the device output with

all 0s loaded to the DAC. It includes the offset of the

DAC and the output amplifier and is expressed in V.

Offset Error

Calculated by taking two points in the linear region of the transfer

function, drawing a line through these points, and extrapolating

back to the y-axis. It is expressed in V.

Voltage Gain

Calculated from the change in output voltage for a change in code,

multiplied by 16,384, and divided by the REF_IN voltage. This is

calculated between two points in the linear section of the transfer

function.

Gain Error

A measure of the output error with all 1s loaded to the DAC, and

the difference between the ideal and actual analog output range.

Ideally, the output should be 50 × REF_IN. It is expressed as a

percentage of full-scale range.

DC Power Supply Rejection Ratio (PSRR)

A measure of the change in analog output for a change in VPP

supply voltage. It is expressed in dB, and VPP is varied ±5%.

DC Crosstalk

The DC change in the output level of one DAC at midscale in

response to a full-scale code change (all 0s to all 1s and vice versa)

and the output change of all other DACs. It is expressed in LSB.

Output Voltage Settling Time

The time taken from when the last data bit is clocked into the DAC

until the output has settled to within ±0.5 LSB of its final value.

Measured for a step change of ¼ to ¾ full scale.

Digital-to-Analog Glitch Impulse

The area of the glitch injected into the analog output when

the code in the DAC register changes state. It is specified as

the area of the glitch in nV-sec when the digital code is changed

by 1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00 or

100 . . . 00 to 011 . . . 11).

Analog Crosstalk

The area of the glitch transferred to the output (VOUT) of one DAC

due to a full-scale change in the output (VOUT) of another DAC. The

area of the glitch is expressed in nV-sec.

Digital Feedthrough

A measure of the impulse injected into the analog outputs from the

digital control inputs when the part is not being written to (SYNC

is high). It is specified in nV-sec and measured with a worst-case

change on the digital input pins, for example, from all 0s to all 1s

and vice versa.

Output Noise Spectral Density

A measure of internally generated random noise. Random noise

is characterized as a spectral density (voltage per √Hz). It is

measured by loading all DACs to midscale and measuring noise at

the output. It is measured in μV/√Hz.