AD5504 datasheet(12/20 Pages) AD

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AD5504

Data Sheet

Rev. B | Page 12 of 20

TERMINOLOGY

Relative Accuracy

For the DAC, relative accuracy, or integral nonlinearity (INL),

is a measure of the maximum deviation in LSBs from a straight

line passing through the endpoints of the DAC transfer function.

Differential Nonlinearity

Differential nonlinearity (DNL) 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 mono-

tonic by design.

Zero-Code Error

Zero-code error is a measure of the output error when zero

code (0x000) is loaded into the DAC register. Ideally, the output

should be 0 V. The zero-code error is always positive in the

AD5504 because the output of the DAC cannot go below 0 V.

It is due to a combination of the offset errors in the DAC and

output amplifier. Zero-code error is expressed in millivolts.

Zero-Code Error Drift

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

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

Offset Error

A measure of the difference between VOUT (actual) and VOUT

(ideal) expressed in millivolts in the linear region of the transfer

function. Offset error is measured on the AD5504 with Code 32

loaded in the DAC registers for 60 V mode and with Code 64

loaded in the DAC registers for 30 V mode. Offset error is

expressed in millivolts.

Offset Error Drift

Offset error drift is a measure of the change in offset error with

a change in temperature. It is expressed in μV/°C.

Full-Scale Error

Full-scale error is a measure of the output error when full-scale

code (0xFFF) is loaded into the DAC register. Full-scale error is

expressed in millivolts.

Full-Scale Error Drift

Full-scale error drift is a measure of the change in full-scale

error with a change in temperature. It is expressed in μV/°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 a percentage of the full-scale range.

Gain Temperature Coefficient

The gain temperature coefficient is a measure of the change in

gain with changes in temperature. It is expressed in (ppm of

full-scale range)/°C.

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-s

and is measured when the digital input code is changed by

1 LSB at the major carry transition.

DC and AC 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 VOUTA,

VOUTB, VOUTC, or VOUTD to a change in VDD for full-scale output of

the DAC. It is measured in decibels. For dc PSRR, VDD is dc

varied ±10%. For ac PSRR, VDD is ac varied ±10%.

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 millivolts.

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 Feedthrough

Digital feedthrough is a measure of the impulse injected into

the analog output of a DAC from the digital input pins of the

device but is measured when the DAC is not being written to

(SYNC held high). It is specified in nV-s and measured with a

full-scale change on the digital input pins, that is, from all 0s to

all 1s or vice versa.

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

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

code change (all 0s to all 1s or vice versa) while keeping LDAC

high, and then pulsing LDAC low and monitoring the output of

the DAC whose digital code has not changed. The area of the

glitch is expressed in nV-s.

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