ADS5500IPAP datasheet(11/37 Pages) TI2

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ENOB +

SINAD * 1.76

6.02

(3)

THD + 10Log10

(4)

SNR + 10Log10

(1)

SINAD + 10Log10

) PD

(2)

ADS5500

SBAS303F – DECEMBER 2003 – REVISED FEBRUARY 2007

Offset Error

Effective Number of Bits (ENOB)

The offset error is the difference, given in number of

The

ENOB

measure

converter's

LSBs, between the ADC's actual average idle

performance as compared to the theoretical limit

channel output code and the ideal average idle

based on quantization noise.

channel output code. This quantity is often mapped

into mV.

Temperature Drift

Total Harmonic Distortion (THD)

The temperature drift coefficient (with respect to gain

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

error and offset error) specifies the change per

to the power of the first eight harmonics (PD).

degree Celsius of the parameter from TMIN to TMAX. It

is calculated by dividing the maximum deviation of

the parameter across the TMIN to TMAX range by the

difference TMAX-TMIN.

THD is typically given in units of dBc (dB to carrier).

Signal-to-Noise Ratio

Spurious-Free Dynamic Range (SFDR)

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

The ratio of the power of the fundamental to the

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

highest other spectral component (either spur or

DC and the first eight harmonics.

harmonic). SFDR is typically given in units of dBc

(dB to carrier).

Two-Tone Intermodulation Distortion

IMD3 is the ratio of the power of the fundamental (at

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

frequencies f1 and f2) to the power of the worst

when the absolute power of the fundamental is used

spectral component at either frequency 2f1–f2 or

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

2f2–f1. IMD3 is either given in units of dBc (dB to

power of the fundamental is extrapolated to the

carrier) when the absolute power of the fundamental

converter's full-scale range.

is used as the reference, or dBFS (dB to full scale)

Signal-to-Noise and Distortion (SINAD)

when the power of the fundamental is extrapolated to

SINAD is the ratio of the power of the fundamental

the converter's full-scale range.

(PS) to the power of all the other spectral

DC Power Supply Rejection Ratio (DC PSRR)

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

The DC PSSR is the ratio of the change in offset

but excluding dc.

error to a change in analog supply voltage. The DC

PSRR is typically given in units of mV/V.

Reference Error

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

The reference error is the variation of the actual

when the absolute power of the fundamental is used

reference voltage (VREFP– VREFM) from its ideal value.

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

The

reference

error

typically

given

power of the fundamental is extrapolated to the

percentage.

converter's full-scale range.

Voltage Overload Recovery Time

The voltage overload recovery time is defined as the

time required for the ADC to recover to within 1% of

the full-scale range in response to an input voltage

overload of 10% beyond the full-scale range.

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