AD5592R datasheet(21/42 Pages) AD

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Data Sheet

AD5592R

Rev. C | Page 21 of 42

DAC 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. A typical INL vs. code plot is shown in Figure 17.

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. A typical DNL vs. code plot can be seen in Figure 18.

Zero Code Error

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

code (0x000) is loaded to the DAC register. Ideally, the output is

0 V. The zero code error is always positive in the AD5592R/

AD5592R-1 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.

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 the

ideal expressed as % FSR.

Offset Error Drift

Offset error drift is a measurement of the change in offset 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 measurement of the difference between VOUT

(actual) and VOUT (ideal), expressed in mV, in the linear region

of the transfer function. Offset error can be negative or positive.

DC Power Supply Rejection Ratio (PSRR)

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 a full-scale output of the DAC. It is measured

in mV/V. 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 SYNC.

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-sec,

and is measured when the digital input code is changed by 1 LSB

at the major carry transition (0x7FF to 0x800).

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-sec, 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.

Noise Spectral Density

Noise spectral density is a measurement of the internally generated

random noise. Random noise is characterized as a spectral

density (nV/√Hz). It is measured by loading the DAC to midscale

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

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

maintained 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-sec.

Analog Crosstalk

Analog crosstalk is the glitch impulse transferred to the output

of one DAC due to a change in the output of another DAC. It is

measured by loading one of the input registers with a full-scale

code change (all 0s to all 1s and vice versa), then executing a

software LDAC (see Table 45 and Table 46), and monitoring the

output of the DAC whose digital code was not changed. The

area of the glitch is expressed in nV-sec.

DAC-to-DAC Crosstalk

DAC-to-DAC crosstalk is the glitch impulse transferred to the

output of one DAC due to a digital code change and subsequent

analog output change of another DAC. It is measured by loading

the attack channel with a full-scale code change (all 0s to all 1s

and vice versa), using the write to and update commands while

monitoring the output of the victim channel that is at midscale.

The energy of the glitch is expressed in nV-sec.

Multiplying Bandwidth

The amplifiers within the DAC have a finite bandwidth; the

multiplying bandwidth is a measure of this. A sine wave on the

reference (with full-scale code loaded to the DAC) appears on

the output. The multiplying bandwidth is the frequency at which

the output amplitude falls to 3 dB below the input.

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