ADC101S051EVAL Ver la hoja de datos (PDF) - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Número de pieza

componentes Descripción

Fabricante

ADC101S051EVAL

Single Channel, 200 to 500 ksps, 10-Bit A/D Converter

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 

Specification Definitions

ACQUISITION TIME is the time required to acquire the input

voltage. That is, it is time required for the hold capacitor to

charge up to the input voltage.

APERTURE DELAY is the time between the fourth falling

SCLK edge of a conversion and the time when the input

signal is acquired or held for conversion.

APERTURE JITTER (APERTURE UNCERTAINTY) is the

variation in aperture delay from sample to sample. Aperture

jitter manifests itself as noise in the output.

CONVERSION TIME is the time required, after the input

voltage is acquired, for the ADC to convert the input voltage

to a digital word.

DIFFERENTIAL NON-LINEARITY (DNL) is the measure of

the maximum deviation from the ideal step size of 1 LSB.

DUTY CYCLE is the ratio of the time that a repetitive digital

waveform is high to the total time of one period. The speci-

fication here refers to the SCLK.

EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE

BITS) is another method of specifying Signal-to-Noise and

Distortion or SINAD. ENOB is defined as

(SINAD − 1.76) / 6.02 and says that the converter is equiva-

lent to a perfect ADC of this (ENOB) number of bits.

FULL POWER BANDWIDTH is a measure of the frequency

at which the reconstructed output fundamental drops 3 dB

below its low frequency value for a full scale input.

GAIN ERROR is the deviation of the last code transition

(111...110) to (111...111) from the ideal (VREF − 1.5 LSB),

after adjusting for offset error.

INTEGRAL NON-LINEARITY (INL) is a measure of the

deviation of each individual code from a line drawn from

negative full scale (1⁄2 LSB below the first code transition)

through positive full scale (1⁄2 LSB above the last code

transition). The deviation of any given code from this straight

line is measured from the center of that code value.

INTERMODULATION DISTORTION (IMD) is the creation of

additional spectral components as a result of two sinusoidal

frequencies being applied to the ADC input at the same time.

It is defined as the ratio of the power in the second and third

order intermodulation products to the sum of the power in

both of the original frequencies. IMD is usually expressed in

dB.

MISSING CODES are those output codes that will never

appear at the ADC outputs. The ADC101S051 is guaranteed

not to have any missing codes.

OFFSET ERROR is the deviation of the first code transition

(000...000) to (000...001) from the ideal (i.e. GND + 0.5

LSB).

SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in

dB, of the rms value of the input signal to the rms value of the

sum of all other spectral components below one-half the

sampling frequency, not including harmonics or d.c.

SIGNAL TO NOISE PLUS DISTORTION (S/N+D or SINAD)

Is the ratio, expressed in dB, of the rms value of the input

signal to the rms value of all of the other spectral compo-

nents below half the clock frequency, including harmonics

but excluding d.c.

SPURIOUS FREE DYNAMIC RANGE (SFDR) is the differ-

ence, expressed in dB, between the desired signal ampli-

tude to the amplitude of the peak spurious spectral compo-

nent, where a spurious spectral component is any signal

present in the output spectrum that is not present at the input

and may or may not be a harmonic.

TOTAL HARMONIC DISTORTION (THD) is the ratio, ex-

pressed in dB or dBc, of the rms total of the first five

harmonic components at the output to the rms level of the

input signal frequency as seen at the output. THD is calcu-

lated as

where Af1 is the RMS power of the input frequency at the

output and Af2 through Af6 are the RMS power in the first 5

harmonic frequencies.

THROUGHPUT TIME is the minimum time required between

the start of two successive conversion. It is the acquisition

time plus the conversion time.

7

www.national.com

Share Link: