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參數資料
| 型號： | TSA1204IFT-E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁數： | 18/31頁 |
| 文件大小： | 435K |
| 代理商： | TSA1204IFT-E |
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TSA1204
Definitions of specified parameters
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10
Definitions of specified parameters
Static parameters
Static measurements are performed using the histograms method on a 2 MHz input signal,
sampled at 50 Msps, which is high enough to fully characterize the test frequency response.
The input level is +1 dBFS 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 exhibits a transfer function which is a straight line from the starting code
to the ending code. The INL is the deviation from this ideal line for each transition.
Dynamic parameters
Dynamic measurements are performed by spectral analysis, applied to an input sine wave
of various frequencies sampled at 40 Msps.
The input level is -1dBFS 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.
The effective number of bits (ENOB) is easily deduced from the SINAD, 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)
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