AD5590BBC datasheet(23/44 Pages) AD

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AD5590

Rev. 0 | Page 23 of 44

TERMINOLOGY

DAC Integrated Nonlinearity

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.

DAC 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. The DAC is guaranteed

monotonic by design.

DAC Offset Error

Offset error is a measure of the difference between the actual

VOUT and the ideal VOUT, expressed in millivolts in the linear

region of the transfer function. It can be negative or positive

and is expressed in millivolts.

DAC Zero-Code Error

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

code (0x0000) is loaded into the DAC register. Ideally, the

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

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.

DAC 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.

DAC 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 microvolts

per degree Celsius.

DAC Gain Error Drift

Gain error drift is a measure of the change in gain error with

changes in temperature. It is expressed in ppm of full-scale

range per degree Celsius.

DAC Full-Scale Error

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

code (0xFFFF) is loaded into the DAC register. Ideally, the out-

put should be VDD − 1 LSB. Full-scale error is expressed as a

percentage of the full-scale range. Figure 10 shows a plot of

typical full-scale error vs. temperature.

DAC 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-sec

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

LSB at the major carry transition (0x7FFF to 0x8000).

DAC 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 VOUT

to a change in DACVDD for full-scale output of the DAC. It is

measured in decibels. VREFIN is held at 2 V, and DACVDD is

varied ±10%.

DAC 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 microvolts.

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 microvolts

per milliamp.

Reference Feedthrough

Reference feedthrough is the ratio of the amplitude of the signal

at the DAC output to the reference input when the DAC output

is not being updated (that is, LDAC is high). It is expressed in

decibels.

DAC 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-sec and measured with

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

to all 1s or vice versa.

DAC 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 or vice versa) in the input register of another

DAC. It is measured in standalone mode and is expressed in

nV-sec.

DAC 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-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

output change of another DAC. This includes both digital and

analog crosstalk. It is measured by loading one of the DACs with a

full-scale code change (all 0s to all 1s or vice versa) with LDAC

low and monitoring the output of another DAC. The energy of

the glitch is expressed in nV-sec.

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