DAC8564IAPW datasheet(40/46 Pages) TI

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Zero-Code Error Drift

Power-Supply Rejection Ratio (PSRR)

Gain Temperature Coefficient

Monotonicity

DYNAMIC PERFORMANCE

Slew Rate

Channel-to-Channel DC Crosstalk

SR=max

(t)

OUT

Channel-to-Channel AC Crosstalk

Output Voltage Settling Time

Code Change/Digital-to-Analog Glitch Energy

Signal-to-Noise Ratio (SNR)

Digital Feedthrough

Total Harmonic Distortion (THD)

DAC8564

SBAS403A – JUNE 2007 – REVISED NOVEMBER 2007

Zero-code error drift is defined as the change in

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

zero-code error with a change in temperature.

ratio of change in output voltage to a change in

Zero-code error drift is expressed in

µV/°C.

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

PSRR of a device indicates how the output of the

DAC is affected by changes in the supply voltage.

PSRR is measured in decibels (dB).

The gain temperature coefficient is defined as the

change in gain error with changes in temperature.

The gain temperature coefficient is expressed in ppm

of FSR/

°C.

Monotonicity is defined as a slope whose sign does

not change. If a DAC is monotonic, the output

changes in the same direction or remains at least

constant for each step increase (or decrease) in the

input code.

Dynamic performance parameters are specifications such as settling time or slew rate. Those are important in

applications where the signal is rapidly changing and/or high frequency signals are present.

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

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

electronic circuit is defined as the maximum rate of

change in the output level of one DAC channel in

change of the output voltage for all possible input

response to a change in the output of another DAC

signals.

channel. It is measured with a full-scale output

change on one DAC channel while monitoring

another DAC channel remains at mid-scale. It is

expressed in LSB.

Where

ΔVOUT(t) is the output produced by the

amplifier as a function of time t.

AC crosstalk in multi-channel DAC is defined as

amount of ac interference experienced on the output

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

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

when the output of an adjacent channel changes its

the DAC output to settle within an error band around

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

its final value after a change in input. Settling times

one channel output oscillating with sine wave of 1KHz

are specified to within ±0.003% (or whatever value is

frequency

while

monitoring

amplitude

1KHz

specified) of full-scale range (FSR).

harmonics on an adjacent DAC channel output (kept

at zero scale). It is expressed in dB.

Digital-to-analog glitch impulse is the impulse injected

into the analog output when the input code in the

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

DAC register changes state. It is normally specified

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

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

divided by the RMS values of the sum of all other

and is measured when the digital input code is

spectral

components

below

one-half

the

output

changed by 1LSB at the major carry transition

frequency, not including harmonics or dc. SNR is

(0x7FFF to 0x8000).

measured in dB.

Digital feedthrough is defined as impulse seen at the

Total harmonic distortion + noise is defined as the

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

ratio of the RMS values of the harmonics and noise

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

to the value of the fundamental frequency. It is

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

expressed in a percentage of the fundamental

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

frequency amplitude at sampling rate fS.

all '1's and vice versa.

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