ADS5242IPAP datasheet(13/29 Pages) TI

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DEFINITION OF SPECIFICATIONS

Analog Bandwidth

Minimum Conversion Rate

Signal-to-Noise and Distortion (SINAD)

Aperture Delay

Aperture Uncertainty (Jitter)

SINAD + 10Log10

* PD

Clock Duty Cycle

Signal-to-Noise Ratio (SNR)

Differential Nonlinearity (DNL)

SNR * 10Log10

Effective Number of Bits (ENOB)

Spurious-Free Dynamic Range

ENOB +

SINAD * 1.76

6.02

Two-Tone, Third-Order Intermodulation

Integral Nonlinearity (INL)

Maximum Conversion Rate

ADS5242

SBAS330C – OCTOBER 2004 – REVISED OCTOBER 2005

The analog input frequency at which the spectral

This is the minimum sampling rate where the ADC

power of the fundamental frequency (as determined

still works.

by FFT analysis) is reduced by 3dB.

SINAD is the ratio of the power of the fundamental

The delay in time between the rising edge of the input

(PS) to the power of all the other spectral components

sampling clock and the actual time at which the

including noise (PN) and distortion (PD), but not

sampling occurs.

including DC.

The sample-to-sample variation in aperture delay.

SINAD is either given in units of dBc (dB to carrier)

when the absolute power of the fundamental is used

as the reference, or dBFS (dB to full-scale) when the

power of the fundamental is extrapolated to the

Pulse width high is the minimum amount of time that

full-scale range of the converter.

the ADCLK pulse should be left in logic ‘1’ state to

achieve rated performance. Pulse width low is the

minimum time that the ADCLK pulse should be left in

a low state (logic ‘0’). At a given clock rate, these

SNR is the ratio of the power of the fundamental (PS)

specifications define an acceptable clock duty cycle.

to the noise floor power (PN), excluding the power at

DC and the first eight harmonics.

An ideal ADC exhibits code transitions that are

exactly 1 LSB apart. DNL is the deviation of any

single LSB transition at the digital output from an

SNR is either given in units of dBc (dB to carrier)

ideal 1 LSB step at the analog input. If a device

when the absolute power of the fundamental is used

claims to have no missing codes, it means that all

as the reference, or dBFS (dB to full-scale) when the

possible codes (for a 12-bit converter, 4096 codes)

power of the fundamental is extrapolated to the

are present over the full operating range.

full-scale range of the converter.

The ENOB is a measure of converter performance as

The ratio of the power of the fundamental to the

compared

the

theoretical

limit

based

highest other spectral component (either spur or

quantization noise.

harmonic). SFDR is typically given in units of dBc (dB

to carrier).

Distortion

Two-tone

IMD3

the

ratio

power

the

INL is the deviation of the transfer function from a

fundamental (at frequencies f1 and f2) to the power of

reference line measured in fractions of 1 LSB using a

the

worst

spectral

component

third-order

best straight line or best fit determined by a least

intermodulation distortion at either frequency 2f1 – f2

square curve fit. INL is independent from effects of

or 2f2 – f1. IMD3 is either given in units of dBc (dB to

offset, gain or quantization errors.

carrier) when the absolute power of the fundamental

is used as the reference, or dBFS (dB to full-scale)

when the power of the fundamental is extrapolated to

The encode rate at which parametric testing is

the full-scale range of the converter.

performed. This is the maximum sampling rate where

certified operation is given.

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