AD5770R datasheet(24/59 Pages) AD

24 / 59 page

AD5770R

Data Sheet

Rev. 0 | Page 24 of 59

TERMINOLOGY

TUE

Total unadjusted error is a measure of the output error taking

all the various errors into account, namely INL error, offset

error, gain error, and output drift over supplies, temperature,

and time. TUE is expressed in % FSR.

Relative Accuracy or Integral Nonlinearity (INL)

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. Typical INL error vs.

DAC code plots are shown in Figure 5 to Figure 10.

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. Typical DNL error vs. DAC code plots are shown in

Figure 11 to Figure 16.

Zero-Scale Error

Zero-scale error is a measurement of the output error when

zero code (0x0000) is loaded to the DAC register. Zero code

error is expressed in µA.

Zero-Scale Error Temperature Coefficient

Zero code error drift is a measure of the change in zero code

error with a change in temperature. It is expressed in nA/°C.

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.

Gain Error 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 IOUTx

(actual) and IOUTx (ideal), expressed in µA, in the linear region

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

Offset Error Drift

Offset error drift is a measurement of the change in offset error

with a change in temperature. It is expressed in µA/°C.

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

IOUTx to a change in AVDD for a full-scale output of the DAC. It

is measured in µA/V.

Output Settling Time

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

a DAC to settle to a specified level for a zero-scale to full-scale

input change and is measured from the falling edge of LDAC.

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 nA-sec,

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

the major carry transition (0x1FFF to 0x2000 for the AD5770R).

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 nA-sec and measured with a full-scale code

change on the data bus, that is, from all 0s to all 1s and vice versa.

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 when monitoring

another DAC maintained at midscale. It is expressed in nA-sec.

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 nA-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 when

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

energy of the glitch is expressed in nA-sec.

Output Noise Spectral Density

Output noise spectral density is a measurement of the internally

generated random noise. Random noise is characterized as a

spectral density (nA/√Hz). It is measured by loading the DAC

to midscale and measuring noise at the output. It is measured

in nA/√Hz.

Multiplexer Switching Glitch

The multiplexer switching glitch is a measure of the impulse

injected into the analog output of the DAC when the monitor

mux is changed to monitor a different channel.

AC Power Supply Rejection Ratio (AC PSRR)

AC power supply rejection ratio is a measure of the rejection of the

output current to ac changes in the power supplies applied to the

DAC. AC PSRR is measured for a given amplitude and frequency

change in power supply voltage and is expressed in decibels.

AD5770R Datasheet(PDF) 24 Page - Analog Devices

AD5770R Datasheet(HTML) 24 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

Datasheet Download

Link URL