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ADC121S625 Datasheet(PDF) 8 Page - Texas Instruments

No. de pieza ADC121S625
Descripción Electrónicos  12-Bit, 50 ksps to 200 ksps, Differential Input, Micro Power Sampling A/D Converter
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ADC121S625 Datasheet(HTML) 8 Page - Texas Instruments

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DOUT
CS
VIH
tDIS
90%
10%
90%
10%
DOUT
90%
10%
ADC121S625
SNAS294B – MAY 2005 – REVISED MARCH 2013
www.ti.com
Figure 8. Voltage Waveform for tDIS
Specification Definitions
APERTURE DELAY is the time between the second falling SCLK edge of a conversion and the time when the
input signal is acquired or held for conversion.
COMMON MODE REJECTION RATIO (CMRR) is a measure of how well in-phase signals common to both input
pins are rejected.
CMRR = 20 LOG (
ΔCommon Input / ΔOutput)
(1)
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
specification 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
equivalent 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 difference between Positive Full Scale Error and Negative Full Scale Error.
INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a line drawn from
negative full scale (½ LSB below the first code transition) through positive full scale (½ 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.
MISSING CODES are those output codes that will never appear at the ADC outputs. The ADC121S625 is
ensured not to have any missing codes.
NEGATIVE FULL-SCALE ERROR is the difference between the differential input voltage at which the output
code transitions from negative full scale and the next code and
−VREF + 0.5 LSB
OFFSET ERROR is the difference between the differential input voltage at which the output code transitions
from code 000h to 001h and 1/2 LSB.
POSITIVE FULL-SCALE ERROR is the difference between the differential input voltage at which the output
code transitions to positive full scale VREF minus 1.5 LSB.
POWER SUPPLY REJECTION RATIO (PSRR) is a measure of how well a change in the supply voltage is
rejected. It is the ratio of the change in Full-Scale Gain Error or the Offset Error that results from a change
in the d.c. power supply voltage, expressed in dB.
PSRR = 20 LOG (
ΔVA / ΔOffset)
(2)
PSRR = 20 LOG (
ΔVA / ΔGain)
(3)
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.
8
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