ADS5510IPAPR datasheet(12/34 Pages) TI2

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DEFINITION OF SPECIFICATIONS

SNR + 10Log10

SINAD + 10Log10

) PD

ENOB +

SINAD * 1.76

6.02

ADS5510

SLAS499 – JANUARY 2007

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

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

pulse width) to the period of the clock signal. Duty

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

cycle is typically expressed as a percentage. A

dc and the first eight harmonics.

perfect 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

converter's full-scale range.

Minimum Conversion Rate

Signal-to-Noise and Distortion (SINAD)

The minimum sampling rate at which the ADC

functions.

SINAD is the ratio of the power of the fundamental

(PS) to the power of all the other spectral

Differential Nonlinearity (DNL)

components including noise (PN) and distortion (PD),

An ideal ADC exhibits code transitions at analog

but excluding dc.

input values spaced exactly 1 LSB 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

measure

converter's

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

performance as compared to the theoretical limit

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

based on 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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