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| 型号： | TSA1401IFT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | ADC |
| 英文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封装： | 7 X 7 MM, TQFP-48 |
| 文件页数： | 18/19页 |
| 文件大小： | 641K |
| 代理商： | TSA1401IFT |
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TSA1401
DEFINITIONS OF SPECIFIED PARAMETERS
8/19
3
DEFINITIONS OF SPECIFIED PARAMETERS
3.1 Static Parameters
Static measurements are performed through the
method of histograms on a 2MHz input signal,
sampled at 20Msps, which is high enough to fully
characterize the test frequency response. An
input level of +1dBFS is used 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.
3.2 Dynamic Parameters
Dynamic
measurements
are
performed
by
spectral analysis, applied to an input sine wave of
various frequencies and sampled at 20Msps.
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 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:
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 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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