ADS5520IPAPR datasheet(13/38 Pages) TI1

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DEFINITION OF SPECIFICATIONS

SNR + 10Log10

SINAD + 10Log10

) PD

ENOB +

SINAD * 1.76

6.02

ADS5520

www.ti.com....................................................................................................................................................... SBAS310F – MAY 2004 – REVISED OCTOBER 2008

Offset Error

Analog Bandwidth

The offset error is the difference, given in number of

The analog input frequency at which the power of the

LSBs, between the ADC's actual average idle

fundamental is reduced by 3 dB with respect to the

channel output code and the ideal average idle

low frequency value.

channel output code. This quantity is often mapped

into mV.

Aperture Delay

Temperature Drift

The delay in time between the falling edge of the

input sampling clock and the actual time at which the

The temperature drift coefficient (with respect to gain

sampling occurs.

error and offset error) specifies the change per

degree Celsius of the parameter from TMIN to TMAX. It

Aperture Uncertainty (Jitter)

is calculated by dividing the maximum deviation of

The sample-to-sample variation in aperture delay.

the parameter across the TMIN to TMAX range by the

difference (TMAX – TMIN).

Clock Pulse Width/Duty Cycle

Signal-to-Noise Ratio (SNR)

The duty cycle of a clock signal is the ratio of the time

the clock signal remains at a logic high (clock pulse

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

width) to the period of the clock signal. Duty cycle is

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

typically expressed as a percentage. A perfect

dc and the first eight harmonics.

differential sine wave clock results in a 50% duty

cycle.

Maximum Conversion Rate

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

The maximum sampling rate at which certified

when the absolute power of the fundamental is used

operation is given. All parametric testing is performed

as the reference or dBFS (dB to Full-Scale) when the

at this sampling rate unless otherwise noted.

power of the fundamental is extrapolated to the

Minimum Conversion Rate

converter's full-scale range.

The minimum sampling rate at which the ADC

Signal-to-Noise and Distortion (SINAD)

functions.

SINAD is the ratio of the power of the fundamental

Differential Nonlinearity (DNL)

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

including noise (PN) and distortion (PD), but excluding

An ideal ADC exhibits code transitions at analog input

dc.

values spaced exactly 1LSB apart. The DNL is the

deviation of any single step from this ideal value,

measured in units of LSBs.

Integral Nonlinearity (INL)

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

when the absolute power of the fundamental is used

The INL is the deviation of the ADC's transfer

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

function from a best fit line determined by a least

power of the fundamental is extrapolated to the

squares curve fit of that transfer function, measured

converter's full-scale range.

in units of LSBs.

Effective Number of Bits (ENOB)

Gain Error

The ENOB is a measure of a converter's performance

The gain error is the deviation of the ADC's actual

as compared to the theoretical limit based on

input full-scale range from its ideal value. The gain

quantization noise.

error is given as a percentage of the ideal input

full-scale range. Gain error does not account for

variations in the internal reference voltages (see the

Electrical Specifications section for limits on the

variation of VREFP and VREFM).

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