ADP2302 datasheet(27/48 Pages) AD

27 / 48 page

Data Sheet

AD5735

Rev. B | Page 27 of 48

Digital-to-Analog Glitch Energy

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

the analog output when the input code in the DAC register

changes state but the output voltage remains constant. 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 (~0x7FFF to 0x8000). See Figure 25.

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 register changes state. It is specified as the amplitude

of the glitch in mV and is measured when the digital input code

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

0x8000). See Figure 25.

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.

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 a subsequent

output change of another DAC. DAC-to-DAC crosstalk includes

both digital and analog crosstalk. It is measured by loading one

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

with LDAC low while monitoring the output of another DAC.

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

Power Supply Rejection Ratio (PSRR)

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

in the power supply voltage.

Reference Temperature Coefficient (TC)

Reference TC is a measure of the change in the reference output

voltage with changes in temperature. It is expressed in ppm/°C.

Line Regulation

Line regulation is the change in the reference output voltage due

to a specified change in supply voltage. It is expressed in ppm/V.

Load Regulation

Load regulation is the change in the reference output voltage due

to a specified change in load current. It is expressed in ppm/mA.

DC-to-DC Converter Headroom

DC-to-DC converter headroom is the difference between the

voltage required at the current output and the voltage supplied

by the dc-to-dc converter (see Figure 51).

Output Efficiency

Output efficiency is defined as the ratio of the power delivered

to a channel’s load and the power delivered to the channel’s

dc-to-dc input. The VBOOST_x quiescent current is considered

part of the dc-to-dc converter’s losses.

LOAD

OUT

Efficiency at VBOOST_x

The efficiency at VBOOST_x is defined as the ratio of the power

delivered to a channel’s VBOOST_x supply and the power delivered

to the channel’s dc-to-dc input. The VBOOST_x quiescent current is

considered part of the dc-to-dc converter’s losses.

BOOST

OUT

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