MAX1032_11 Datasheet, PDF (29/32 Pages) Maxim Integrated Products – 8- and 4-Channel, ±3 x VREF Multirange Inputs, Serial 14-Bit ADCs

8- and 4-Channel, ±3 x V_REF
Multirange Inputs, Serial 14-Bit ADCs
Effective Number of Bits (ENOB)
ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. With an
input range equal to the ADC’s full-scale range, calcu-
late the ENOB as follows:
ENOB
=
⎛ SINAD − 1.76⎞
⎝⎜
6.02
⎠⎟
Total Harmonic Distortion (THD)
For the MAX1032/MAX1033, THD is the ratio of the
RMS sum of the input signal’s first four harmonic com-
ponents to the fundamental itself. This is expressed as:
⎛
THD
=
20 ×
log^⎜
⎜
⎝
V₂₂
+
V₃₂
+
V₄₂
+
V₅₂
⎞
⎟
V₁
⎟
⎠
where V₁ is the fundamental amplitude, and V₂ through
V₅ are the amplitudes of the 2nd- through 5th-order
harmonic components.
Spurious-Free Dynamic Range (SFDR)
SFDR is the ratio of RMS amplitude of the fundamental
(maximum signal component) to the RMS value of the
next-largest spectral component.
SCLK
(MODE 0)
SCLK
(MODE 1)
INTCLK
(MODE 2)
13
14
15
16
10
11
ANALOG INPUT
TRACK AND HOLD
TRACK
Figure 21. Aperture Diagram
15
12
t_AJ
t_AD
SAMPLE INSTANT
HOLD
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