ADS5541IPAPR datasheet(12/37 Pages) TI1

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DEFINITION OF SPECIFICATIONS

SNR + 10Log10

(1)

SINAD + 10Log10

) PD

(2)

ENOB +

SINAD * 1.76

6.02

(3)

Production Data

ADS5541

SBAS307C – MAY 2004 – REVISED FEBRUARY 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 actual average idle channel

fundamental is reduced by 3dB with respect to the

output code and the ideal average idle channel

low frequency value.

output code. This quantity is often mapped into mV.

Aperture Delay

Temperature Drift

The delay in time between the falling edge of the

The temperature drift coefficient (with respect to gain

input sampling clock and the actual time at which the

error and offset error) specifies the change per

sampling occurs.

degree Celsius of the parameter from TMIN to TMAX. It

is calculated by dividing the maximum deviation of

Aperture Uncertainty (Jitter)

the parameter across the TMIN to TMAX range by the

The sample-to-sample variation in aperture delay.

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

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

time the clock signal remains at a logic high (clock

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

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

dc and the first eight harmonics.

cycle is typically expressed as a percentage. A

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)

when the absolute power of the fundamental is used

The maximum sampling rate at which certified

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

operation is given. All parametric testing is performed

power of the fundamental is extrapolated to the

at this sampling rate unless otherwise noted.

converter full-scale range.

Minimum Conversion Rate

Signal-to-Noise and Distortion (SINAD)

The minimum sampling rate at which the ADC

SINAD is the ratio of the power of the fundamental

functions.

(PS) to the power of all the other spectral

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

Differential Nonlinearity (DNL)

but excluding dc.

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.

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

Integral Nonlinearity (INL)

when the absolute power of the fundamental is used

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

The INL is the deviation of the ADC transfer function

power of the fundamental is extrapolated to the

from a best fit line determined by a least squares

converter full-scale range.

curve fit of that transfer function, measured in units

of LSBs.

Effective Number of Bits (ENOB)

Gain Error

The

ENOB

measure

converter's

performance as compared to the theoretical limit

The gain error is the deviation of the ADC actual

based on quantization noise.

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 Characteristics section for limits on the

variation of VREFP and VREFM).

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