AD5758 datasheet(30/72 Pages) AD

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AD5758

Data Sheet

Rev. 0 | Page 30 of 72

Dynamic Power Control (DPC)

In this mode, the AD5758 circuitry senses the output voltage

and dynamically regulates the supply voltage, VDPC+, to meet

compliance requirements plus an optimized headroom voltage

for the output buffer.

Programmable Power Control (PPC)

In this mode, the VDPC+ voltage is user-programmable to a fixed

level that needs to accommodate the maximum output load

required.

Output Voltage Settling Time

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

output to settle to a specified level for a full-scale input change.

This specification depends on the manner in which the DPC

feature is configured (enabled, disabled, PPC mode enabled)

and on the characteristics of the external dc-to-dc inductor and

capacitor components used.

Slew Rate

The slew rate of a device is a limitation in the rate of change

of the output voltage. The output slewing speed of a voltage

output DAC is usually limited by the slew rate of the amplifier

used at its output. Slew rate is measured from 10% to 90% of the

output signal and is expressed in V/μs.

Power-On Glitch Energy

Power-on glitch energy is the impulse injected into the analog

output when the AD5758 is powered on. It is specified as the

area of the glitch in nV-sec.

Digital-to-Analog Glitch Energy

Digital-to-analog glitch energy is the energy of the impulse injected

into the analog output when the input code in the DAC output

glitch in nV-sec. Worst case is usually when the digital input

code is changed by 1 LSB at the major carry transition (0x7FFF

to 0x8000).

Glitch Impulse Peak Amplitude

Glitch impulse peak amplitude is the peak amplitude of the

impulse injected into the analog output when the input code in

the DAC output register changes state. It is specified as the amp-

litude of the glitch in millivolts and the worst case is usually

when the digital input code is changed by 1 LSB at the major

carry transition (0x7FFF to 0x8000).

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

(LDAC pin is held high). It is specified in nV-sec and measured

with a full-scale code change on the data bus.

Power Supply Rejection Ratio (PSRR)

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

in the power supply voltage.

AD5758 Datasheet(PDF) 30 Page - Analog Devices

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