DAC8564 datasheet(40/47 Pages) TI1

40 / 47 page

SR=max

(t)

OUT

DAC8165

SBAS409B

– FEBRUARY 2008 – REVISED MARCH 2011

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Power-Supply Rejection Ratio (PSRR)

Channel-to-Channel DC Crosstalk

Power-supply rejection ratio (PSRR) is defined as the

Channel-to-channel dc crosstalk is defined as the dc

ratio of change in output voltage to a change in

change in the output level of one DAC channel in

supply voltage for a full-scale output of the DAC. The

response to a change in the output of another DAC

PSRR of a device indicates how the output of the

channel. It is measured with a full-scale output

DAC is affected by changes in the supply voltage.

change on one DAC channel while monitoring

PSRR is measured in decibels (dB).

another DAC channel remains at midscale; it is

expressed in LSB.

Monotonicity

Channel-to-Channel AC Crosstalk

Monotonicity is defined as a slope whose sign does

not change. If a DAC is monotonic, the output

AC crosstalk in a multi-channel DAC is defined as the

changes in the same direction or remains at least

amount of ac interference experienced on the output

constant for each step increase (or decrease) in the

of a channel at a frequency (f) (and its harmonics),

input code.

when the output of an adjacent channel changes its

value at the rate of frequency (f). It is measured with

one channel output oscillating with a sine wave

DYNAMIC PERFORMANCE

frequency of 1kHz, while monitoring the amplitude of

Dynamic performance parameters are specifications

1kHz harmonics on an adjacent DAC channel output

such as settling time or slew rate, which are important

(kept at zero scale); it is expressed in dB.

in applications where the signal rapidly changes

and/or high frequency signals are present.

Signal-to-Noise Ratio (SNR)

Signal-to-noise ratio (SNR) is defined as the ratio of

Slew Rate

the root mean-squared (RMS) value of the output

The output slew rate (SR) of an amplifier or other

signal divided by the RMS values of the sum of all

electronic circuit is defined as the maximum rate of

other spectral components below one-half the output

change of the output voltage for all possible input

frequency, not including harmonics or dc. SNR is

signals.

measured in dB.

Total Harmonic Distortion (THD)

Total harmonic distortion + noise is defined as the

Where

ΔVOUT(t) is the output produced by the

ratio of the RMS values of the harmonics and noise

amplifier as a function of time t.

to the value of the fundamental frequency. It is

expressed in a percentage of the fundamental

Output Voltage Settling Time

frequency amplitude at sampling rate fS.

Settling time is the total time (including slew time) for

Spurious-Free Dynamic Range (SFDR)

the DAC output to settle within an error band around

its final value after a change in input. Settling times

Spurious-free dynamic range (SFDR) is the usable

are specified to within

±0.003% (or whatever value is

dynamic range of a DAC before spurious noise

specified) of full-scale range (FSR).

interferes or distorts the fundamental signal. SFDR is

the measure of the difference in amplitude between

Code Change/Digital-to-Analog Glitch Energy

the fundamental and the largest harmonically or

non-harmonically related spur from dc to the full

Digital-to-analog glitch impulse is the impulse injected

Nyquist bandwidth (half the DAC sampling rate, or

into the analog output when the input code in the

fS/2). A spur is any frequency bin on a spectrum

DAC register changes state. It is normally specified

analyzer, or from a Fourier transform, of the analog

as the area of the glitch in nanovolts-second (nV-s),

output of the DAC. SFDR is specified in decibels

and is measured when the digital input code changes

relative to the carrier (dBc).

by 1LSB at the major carry transition.

Signal-to-Noise plus Distortion (SINAD)

Digital Feedthrough

SINAD includes all the harmonic and outstanding

Digital feedthrough is defined as impulse seen at the

spurious components in the definition of output noise

output of the DAC from the digital inputs of the DAC.

power in addition to quantizing any internal random

It is measured when the DAC output is not updated. It

noise power. SINAD is expressed in dB at a specified

is specified in nV-s, and measured with a full-scale

input frequency and sampling rate, fS.

code change on the data bus; that is, from all '0's to

all '1's and vice versa.

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