ADS5237 datasheet(14/29 Pages) TI

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DEFINITION OF SPECIFICATIONS

Minimum Conversion Rate

Analog Bandwidth

Signal-to-Noise and Distortion (SINAD)

Aperture Delay

SINAD=10Log

P +P

Aperture Uncertainty (Jitter)

Clock Duty Cycle

Signal-to-Noise Ratio (SNR)

Differential Nonlinearity (DNL)

SNR=10Log

Spurious-Free Dynamic Range

Effective Number of Bits (ENOB)

ENOB=

SINAD

1.76

6.02

Two-Tone, Third-Order Intermodulation

Integral Nonlinearity (INL)

Maximum Conversion Rate

ADS5237

SBAS420A – AUGUST 2007 – REVISED OCTOBER 2007

This is the minimum sampling rate where the ADC

still works.

The analog input frequency at which the spectral

power of the fundamental frequency (as determined

by FFT analysis) is reduced by 3dB.

SINAD is the ratio of the power of the fundamental

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

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

The delay in time between the rising edge of the input

including dc.

sampling clock and the actual time at which the

sampling occurs.

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

The sample-to-sample variation in aperture delay.

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

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

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

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

specifications define an acceptable clock duty cycle.

dc and the first eight harmonics.

An ideal ADC exhibits code transitions that are

exactly 1 LSB apart. DNL is the deviation of any

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

single LSB transition at the digital output from an

when the absolute power of the fundamental is used

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

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

claims to have no missing codes, it means that all

power of the fundamental is extrapolated to the

possible codes (for a 10-bit converter, 1024 codes)

full-scale range of the converter.

are present over the full operating range.

The ratio of the power of the fundamental to the

The ENOB is a measure of converter performance as

highest other spectral component (either spur or

compared

the

theoretical

limit

based

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

quantization noise.

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 full-scale range of the converter.

The encode rate at which parametric testing is

performed. This is the maximum sampling rate where

certified operation is given.

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