RHF1201_11 STMICROELECTRONICS [STMicroelectronics], RHF1201_11 Datasheet - Page 29

• Manufacturer Part Number: RHF1201_11
• Description: Rad-hard 12-bit 50 Msps A/D converter
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

RHF1201
8
8.1
8.2
Definitions of specified parameters
Static parameters
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
Spurious free dynamic range (SFDR)
The ratio between the power of the worst spurious signal (not always a harmonic) and the
amplitude of the fundamental tone (signal power) over the full Nyquist band. 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. 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 (f
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). Expressed in dB.
The effective number of bits (ENOB) is easily deduced from the SINAD, using the formula:
When the applied signal is not full-scale (FS) but has an amplitude A
expression becomes:
ENOB is expressed in bits.
Effective resolution bandwidth
For a given sampling rate and clock jitter, this is the analog input frequency at which the
SINAD is reduced by 3 dB, and the ENOB is reduced by 0.5 bits.
SINAD = 6.02 × ENOB + 1.76 dB
SINAD = 6.02 × ENOB + 1.76 dB + 20 log (A
Doc ID 12585 Rev 5
s
/2) excluding DC, fundamental and the first five
0
/FS)
Definitions of specified parameters
0
, the SINAD
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