AD5667BCPZ-R2 datasheet(18/32 Pages) AD

18 / 32 page

AD5627R/AD5647R/AD5667R, AD5627/AD5667

Rev. 0 | Page 18 of 32

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy or integral nonlinearity is a

measurement of the maximum deviation, in LSBs, from a straight

line passing through the endpoints of the DAC transfer function.

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. This DAC is guaranteed monotonic by design.

Zero-Code Error

Zero-code error is a measurement of the output error when

zero scale (0x0000) is loaded to the DAC register. Ideally, the

output should be 0 V. The zero-code error is always positive in

the AD5667R because the output of the DAC cannot go below

0 V due to a combination of the offset errors in the DAC and

the output amplifier. Zero-code error is expressed in mV.

Full-Scale Error

Full-scale error is a measurement of the output error when full-

scale code (0xFFFF) is loaded to the DAC register. Ideally, the

output should be VDD − 1 LSB. Full-scale error is expressed in %

of full-scale range (FSR).

Gain Error

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

deviation in slope of the DAC transfer characteristic from ideal

expressed in % of FSR.

Zero-Code Error Drift

Zero-code error drift is a measurement of the change in zero-

code error with a change in temperature. It is expressed in μV/°C.

Gain Temperature Coefficient

Gain temperature coefficient is a measurement of the change in

gain error with changes in temperature. It is expressed in ppm

of FSR/°C.

Offset Error

Offset error is a measure of the difference between VOUT (actual)

and VOUT (ideal) expressed in mV in the linear region of the

transfer function. Offset error is measured on the AD5667R

with code 512 loaded in the DAC register. It can be negative or

positive.

DC Power Supply Rejection Ratio (PSRR)

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

changes in the supply voltage. PSRR is the ratio of the change in

VOUT to a change in VDD for full-scale output of the DAC. It is

measured in dB. VREF is held at 2 V and VDD is varied by ±10%.

Output Voltage Settling Time

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

the output of a DAC to settle to a specified level for a ¼ to ¾

full-scale input change and is measured from the rising edge of

the stop condition.

Digital-to-Analog Glitch Impulse

Digital-to-analog glitch impulse is the impulse injected into the

analog output when the input code in the DAC register changes

state. It is normally specified as the area of the glitch in nV-s,

and is measured when the digital input code is changed by

1 LSB at the major carry transition (0x7FFF to 0x8000) (see

Figure 42).

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. It

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

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

Reference Feedthrough

Reference feedthrough is the ratio of the amplitude of the signal

at the DAC output to the reference input when the DAC output

is not being updated. It is expressed in dB.

Output Noise Spectral Density

Output noise spectral density is a measurement of the internally

generated random noise. Random noise is characterized as a

spectral density. It is measured by loading the DAC to midscale

and measuring noise at the output. It is measured in nV/√Hz. A

plot of noise spectral density can be seen in Figure 48.

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 (or soft

power-down and power-up) while monitoring another DAC kept

at midscale. It is expressed in μV.

DC crosstalk due to load current change is a measure of the

impact that a change in load current on one DAC has to

another DAC kept at midscale. It is expressed in μV/mA.

Digital Crosstalk

Digital crosstalk is the glitch impulse transferred to the output

of one DAC at midscale in response to a full-scale code change

(all 0s to all 1s and vice versa) in the input register of another

DAC. It is measured in standalone mode and is expressed in nV-s.

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