ADC14L020CIVY datasheet(9/23 Pages) NSC

Part #	ADC14L020CIVY

Description	14-Bit, 20MSPS, 150 mW A/D Converter

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Manufacturer	NSC [National Semiconductor (TI)]

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Specification Definitions

APERTURE DELAY is the time after the rising edge of the

clock to when the input signal is acquired or held for conver-

sion.

APERTURE JITTER (APERTURE UNCERTAINTY) is the

variation in aperture delay from sample to sample. Aperture

jitter manifests itself as noise in the output.

CLOCK DUTY CYCLE is the ratio of the time during one

cycle that a repetitive digital waveform is high to the total

time of one period. The specification here refers to the ADC

clock input signal.

COMMON MODE VOLTAGE (V

CM) is the common d.c. volt-

age applied to both input terminals of the ADC.

CONVERSION LATENCY is the number of clock cycles

between initiation of conversion and when that data is pre-

sented to the output driver stage. Data for any given sample

is available at the output pins the Pipeline Delay plus the

Output Delay after the sample is taken. New data is available

at every clock cycle, but the data lags the conversion by the

pipeline delay.

DIFFERENTIAL NON-LINEARITY (DNL) is the measure of

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

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 deviation from the ideal slope of the

transfer function. It can be calculated as:

Gain Error = Positive Full Scale Error − Negative Full

Scale Error

It can also be expressed as Positive Gain Error and Negative

Gain Error, which are calculated as:

PGE = Positive Full Scale Error - Offset Error

NGE = Offset Error - 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 (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 intermodulation

products to the total power in the original frequencies. IMD is

usually expressed in dBFS.

LSB (LEAST SIGNIFICANT BIT) is the bit that has the

smallest value or weight of all bits. This value is V

FS/2

n,

where “V

FS” is the full scale input voltage and “n” is the ADC

resolution in bits.

MISSING CODES are those output codes that will never

appear at the ADC outputs. The ADC14L020 is guaranteed

not to have any missing codes.

MSB (MOST SIGNIFICANT BIT) is the bit that has the

largest value or weight. Its value is one half of full scale.

NEGATIVE FULL SCALE ERROR is the difference between

the actual first code transition and its ideal value of 1⁄2 LSB

above negative full scale.

OFFSET ERROR is the difference between the two input

voltages [(V

IN+) – (VIN-)] required to cause a transition from

code 8191 to 8192.

OUTPUT DELAY is the time delay after the rising edge of

the clock before the data update is presented at the output

pins.

PIPELINE DELAY (LATENCY) See CONVERSION LA-

TENCY.

POSITIVE FULL SCALE ERROR is the difference between

the actual last code transition and its ideal value of 11⁄2 LSB

below positive full scale.

POWER SUPPLY REJECTION RATIO (PSRR) is a mea-

sure of how well the ADC rejects a change in the power

supply voltage. PSRR is the ratio of the change in Full-Scale

Error that results from a change in the d.c. power supply

voltage, expressed in dB.

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 rms values of the input

signal and the peak spurious signal, where a spurious signal

is any signal present in the output spectrum that is not

present at the input.

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

pressed in dB, of the rms total of the first nine harmonic

levels at the output to the level of the fundamental at the

output. THD is calculated as

where f

1 is the RMS power of the fundamental (output)

frequency and f

2 through f10 are the RMS power of the first

9 harmonic frequencies in the output spectrum.

SECOND HARMONIC DISTORTION (2ND HARM) is the

difference expressed in dB, between the RMS power in the

input frequency at the output and the power in its 2nd

harmonic level at the output.

THIRD HARMONIC DISTORTION (3RD HARM) is the dif-

ference, expressed in dB, between the RMS power in the

input frequency at the output and the power in its 3rd har-

monic level at the output.

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