TSA1005-40IF View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TSA1005-40IF

DUAL-CHANNEL, 10-BIT, 20/40MSPS A/D CONVERTER

STMicroelectronics 

TSA1005

DEFINITIONS OF SPECIFIED PARAMETERS

STATIC PARAMETERS

Static measurements are performed using a

histogram method with on a 2 MHz input signal,

sampled at 40 Msps, which is high enough to fully

characterize the test frequency response. An

input level of +1 dBFS is required to saturate the

signal.

Differential Non Linearity (DNL)

The average deviation of any output code width

from the ideal code width of 1 LSB.

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 by

spectral analysis, applied to an input sine wave of

various frequencies and sampled at 40 Msps.

The input level is -1 dBFS to measure the linear

behavior of the converter. All the parameters are

given without correction for the full scale

amplitude performance except the calculated

ENOB parameter.

Spurious Free Dynamic Range (SFDR)

The ratio between the power of the worst spurious

signal (not always an harmonic) and the

amplitude of fundamental tone (signal power)

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 Distortion 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:

SINAD2Ao = SINADFull Scale+ 20 log (2A0/FS)

SINAD2Ao = 6.02 × ENOB + 1.76dB + 20 log (2A0/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 3 dB. 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 the initial sample of the analog

input and the availability of the corresponding

digital data output, on the output bus. Also called

data latency. It is expressed as a number of clock

cycles.

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