Obsolete
Product(s)
- Obsolete
Product(s)
TSA1005
13/22
NO
T
FOR
NEW
DESI
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N
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.