DAC8564_15 datasheet(42/51 Pages) TI

42 / 51 page

SR=max

(t)

OUT

DAC8564

SBAS403D

– JUNE 2007 – REVISED MAY 2011

www.ti.com

Gain Temperature Coefficient

Digital Feedthrough

The gain temperature coefficient is defined as the

Digital feedthrough is defined as impulse seen at the

change in gain error with changes in temperature.

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

The gain temperature coefficient is expressed in ppm

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

of FSR/

°C.

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

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

Power-Supply Rejection Ratio (PSRR)

all '1's and vice versa.

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

Channel-to-Channel DC Crosstalk

ratio of change in output voltage to a change in

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

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

PSRR of a device indicates how the output of the

change in the output level of one DAC channel in

DAC is affected by changes in the supply voltage.

response to a change in the output of another DAC

PSRR is measured in decibels (dB).

channel. It is measured with a full-scale output

change on one DAC channel while monitoring

Monotonicity

another DAC channel remains at midscale. It is

expressed in LSB.

Monotonicity is defined as a slope whose sign does

not change. If a DAC is monotonic, the output

Channel-to-Channel AC Crosstalk

changes in the same direction or remains at least

constant for each step increase (or decrease) in the

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

input code.

amount of ac interference experienced on the output

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

when the output of an adjacent channel changes its

DYNAMIC PERFORMANCE

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

Dynamic performance parameters are specifications

one channel output oscillating with a sine wave of

such as settling time or slew rate, which are important

1kHz frequency, while monitoring the amplitude of

in applications where the signal rapidly changes

1kHz harmonics on an adjacent DAC channel output

and/or high frequency signals are present.

(kept at zero scale). It is expressed in dB.

Slew Rate

Signal-to-Noise Ratio (SNR)

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

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

electronic circuit is defined as the maximum rate of

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

change of the output voltage for all possible input

signal divided by the RMS values of the sum of all

signals.

other spectral components below one-half the output

frequency, not including harmonics or dc. SNR is

measured in dB.

Total Harmonic Distortion (THD)

Where

ΔVOUT(t) is the output produced by the

amplifier as a function of time t.

Total harmonic distortion + noise is defined as the

ratio of the RMS values of the harmonics and noise

Output Voltage Settling Time

to the value of the fundamental frequency. It is

expressed in a percentage of the fundamental

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

frequency amplitude at sampling rate fS.

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)

are specified to within

±0.003% (or whatever value is

specified) of full-scale range (FSR).

Spurious-free dynamic range (SFDR) is the usable

dynamic range of a DAC before spurious noise

Code Change/Digital-to-Analog Glitch Energy

interferes or distorts the fundamental signal. SFDR is

the measure of the difference in amplitude between

Digital-to-analog glitch impulse is the impulse injected

the fundamental and the largest harmonically or

into the analog output when the input code in the

non-harmonically related spur from dc to the full

DAC register changes state. It is normally specified

Nyquist bandwidth (half the DAC sampling rate, or

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

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

and is measured when the digital input code is

analyzer, or from a Fourier transform, of the analog

changed by 1LSB at the major carry transition.

output of the DAC. SFDR is specified in decibels

relative to the carrier (dBc).

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