TSA0801 datasheet(8/20 Pages) STMICROELECTRONICS

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TSA0801

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DEFINITIONS OF SPECIFIED PARAMETERS

STATIC PARAMETERS

Static measurements are performed through

method of histograms on a 2MHz input signal,

sampled at 40Msps, which is high enough to fully

characterize the test frequency response. The

input level is +1dBFS to saturate the signal.

Differential Non Linearity (DNL)

The average deviation of any output code width

from the ideal code width of 1LSB.

Integral Non linearity (INL)

An ideal converter presents a transfer function as

being the straight line from the starting code to the

ending code. The INL is the deviation for each

transition from this ideal curve.

DYNAMIC PARAMETERS

Dynamic

measurements

are

performed

spectral analysis, applied to an input sinewave of

various frequencies and sampled at 40Msps.

Spurious Free Dynamic Range (SFDR)

The ratio between the amplitude of fundamental

tone (signal power) and the power of the worst

spurious signal (not always an harmonic) over the

full Nyquist band. It is expressed in dBc.

Total Harmonic Distortion (THD)

The ratio of the rms sum of the first five harmonic

distortion components to the rms value of the

fundamental line. It is expressed in dB.

Signal to Noise Ratio (SNR)

The ratio of the rms value of the fundamental

component to the rms sum of all other spectral

components in the Nyquist band (fs/2) excluding

DC, fundamental and the first five harmonics.

SNR is reported in dB.

Signal to Noise and Distorsion Ratio (SINAD)

Similar ratio as for SNR but including the harmonic

distortion components in the noise figure (not DC

signal). It is expressed in dB.

From the SINAD, the Effective Number of Bits

(ENOB) can easily be deduced using the formula:

SINAD= 6.02

× ENOB + 1.76 dB.

When the applied signal is not Full Scale (FS), but

has an A0 amplitude, the SINAD expression

becomes:

SINAD= 6.02

× ENOB + 1.76 dB + 20 log (2A

0/FS)

The ENOB is expressed in bits.

Analog Input Bandwidth

The maximum analog input frequency at which the

spectral response of a full power signal is reduced

by 3dB. Higher values can be achieved with

smaller input levels.

Effective Resolution Bandwidth (ERB)

The band of input signal frequencies that the ADC

is intended to convert without loosing linearity i.e.

the maximum analog input frequency at which the

SINAD is decreased by 3dB or the ENOB by 1/2

bit.

Pipeline delay

Delay between time when the analog input is

initially sampled and time when the corresponding

digital data output is valid on the output bus. Also

called data latency. It is expressed as a number of

clock cycles.

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