EVAL-AD5443EB【PDF 11/24 页】CAP X7R 470PF 50V 10% 0603

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REV. 0

AD5426/AD5432/AD5443

–11–

TERMINOLOGY

Relative Accuracy

Relative accuracy or endpoint nonlinearity is a measure of the

maximum deviation from a straight line passing through the

endpoints of the DAC transfer function. It is measured after

adjusting for 0 and full scale and is normally expressed in LSBs

or as a percentage of full-scale reading.

Differential Nonlinearity

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 max over

the operating temperature range ensures monotonicity.

Gain Error

Gain error or full-scale error is a measure of the output error

between an ideal DAC and the actual device output. For these

DACs, ideal maximum output is V

REF

– 1 LSB. Gain error of

the DACs is adjustable to 0 with external resistance.

Output Leakage Current

Output leakage current is current that flows in the DAC ladder

switches when these are turned off. For the I

OUT

1 terminal, it

can be measured by loading all 0s to the DAC and measuring

the I

OUT

1 current. Minimum current will flow in the I

OUT

2 line

when the DAC is loaded with all 1s.

Output Capacitance

Capacitance from I

OUT

1 or I

OUT

2 to AGND.

Output Current Settling Time

This is the amount of time it takes for the output to settle to a

specified level for a full scale input change. For these devices, it

is specified with a 100

resistor to ground.

The settling time specification includes the digital delay from

SYNC

rising edge to the full-scale output charge.

Digital to Analog Glitch Impulse

The amount of charge injected from the digital inputs to the

analog output when the inputs change state. This is normally

specified as the area of the glitch in either pA-secs or nV-secs

depending upon whether the glitch is measured as a current or

voltage signal.

Digital Feedthrough

When the device is not selected, high frequency logic activity on

the device digital inputs may be capacitively coupled through the

device to show up as noise on the I

OUT

pins and subsequently

into the following circuitry. This noise is digital feedthrough.

Multiplying Feedthrough Error

This is the error due to capacitive feedthrough from the DAC

reference input to the DAC I

OUT

1 terminal, when all 0s are

loaded to the DAC.

Total Harmonic Distortion (THD)

The DAC is driven by an ac reference. The ratio of the rms

sum of the harmonics of the DAC output to the fundamental

value is the THD. Usually only the lower order harmonics are

included, such as second to fifth.

(

log

THD

)

Digital Intermodulation Distortion

Second-order intermodulation distortion (IMD) measurements

are the relative magnitude of the fa and fb tones generated digi-

tally by the DAC and the second-order products at 2fa – fb and

2fb – fa.

Spurious-Free Dynamic Range (SFDR)

It is the usable dynamic range of a DAC before spurious noise

interferes or distorts the fundamental signal. SFDR is the mea-

sure of difference in amplitude between the fundamental and

the largest harmonically or nonharmonically related spur from

dc to full Nyquist bandwidth (half the DAC sampling rate, or

/2). Narrow band SFDR is a measure of SFDR over an arbi-

trary window size, in this case 50% of the fundamental. Digital

SFDR is a measure of the usable dynamic range of the DAC

when the signal is digitally generated sine wave.

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