ADS5553IPFPR datasheet(9/27 Pages) TI2

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ADS5553

SLWS158 − FEBRUARY 2005

www.ti.com

DEFINITION OF SPECIFICATIONS

Analog Bandwidth

The analog input frequency at which the power of the

fundamental is reduced by 3 dB with respect to the low

frequency value.

Aperture Delay

The delay between the falling edge of the input

sampling clock and the actual time at which the

sampling occurs.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Clock Pulse Width/Duty Cycle

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

the clock signal remains at a logic high (clock pulse

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

typically expressed as a percentage. A perfect

differential sine wave clock results in a 50% duty cycle.

Maximum Conversion Rate

The maximum sampling rate at which certified

operation is given. All parametric testing is performed

at this sampling rate unless otherwise noted.

Minimum Conversion Rate

The minimum sampling rate at which the ADC

functions.

Differential Nonlinearity (DNL)

An ideal ADC exhibits code transitions at analog input

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)

The INL is the deviation of the ADC’s transfer function

from a best fit line determined by a least squares curve

fit of that transfer function, measured in units of LSBs.

Gain Error

The gain error is the deviation of the ADC’s actual input

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

Offset Error

The offset error is the difference, given in number of

LSBs, between the ADC’s actual average idle channel

output code and the ideal average idle channel output

code. This quantity is often mapped into mV.

Temperature Drift

The temperature drift coefficient (with respect to gain

error and offset error) specifies the change per degree

celcius of the parameter from TMIN to TMAX. It is

calcuated by dividing the maximum deviation of the

parameter across the TMIN to TMAX range by the

difference TMAX−TMIN.

Signal-to-Noise Ratio

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

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

and the first eight harmonics.

SNR + 10Log10

SNR 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 converter’s

full-scale range.

Signal-to-Noise and Distortion (SINAD)

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 excluding

DC.

SINAD + 10Log10

PN ) PD

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 converter’s

full-scale range.

Effective Number of Bits (ENOB)

The ENOB is a measure of a converter’s performance

as compared to the theoretical limit based on

quantization noise.

ENOB + SINAD * 1.76

6.02

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