AD5593R datasheet(18/34 Pages) AD

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Data Sheet

AD5593R

Rev. B | Page 17 of 33

DAC DC Power Supply Rejection Ratio (PSRR)

For the DAC, 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 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

SDA that generates 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-sec,

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

the major carry transition (0x7FF to 0x800) (see Figure 16 and

Figure 17).

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 (NSD)

NSD 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. A plot

of noise spectral density is shown in Figure 25.

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-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

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

scale code change (all 0s to all 1s and vice versa). Then it is

measured by executing a software LDAC 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 finite bandwidth. 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.

DAC Total Harmonic Distortion (THD)

For the DAC, THD is the difference between an ideal sine wave

and its attenuated version using the DAC. The sine wave is used

as the reference for the DAC, and the THD is a measurement of

the harmonics present on the DAC output. It is measured in dB.

Voltage Reference Temperature Coefficient (TC)

Voltage reference TC is a measure of the change in the reference

output voltage with a change in temperature. The voltage

reference TC is calculated using the box method, which defines

the TC as the maximum change in the reference output over a

given temperature range expressed in ppm/°C, as follows:

)

(

)

(

)

(





















Range

Temp

NOM

REF

MIN

REF

MAX

REF

where:

VREF(MAX) is the maximum reference output measured over the

total temperature range.

VREF(MIN) is the minimum reference output measured over the

total temperature range.

VREF(NOM) is the nominal reference output voltage, 2.5 V.

Temp Range is the specified temperature range of −40°C to

+105°C.

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