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MAX1185 Datasheet(PDF) 17 Page - Maxim Integrated Products

Part No. MAX1185
Description  Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1185 Datasheet(HTML) 17 Page - Maxim Integrated Products

 
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quantization error (residual error). The ideal, theoretical
minimum analog-to-digital noise is caused by quantiza-
tion error only and results directly from the ADC’s reso-
lution (N-Bits):
SNRdB[max] = 6.02dB x N + 1.76dB
In reality, there are other noise sources besides quanti-
zation noise: thermal noise, reference noise, clock jitter,
etc. SNR is computed by taking the ratio of the RMS
signal to the RMS noise, which includes all spectral
components minus the fundamental, the first five har-
monics, and the DC offset.
Signal-to-Noise Plus Distortion (SINAD)
SINAD is computed by taking the ratio of the RMS sig-
nal to all spectral components minus the fundamental
and the DC offset.
Effective Number of Bits (ENOB)
ENOB specifies the dynamic performance of an ADC at
a specific input frequency and sampling rate. An ideal
ADCs error consists of quantization noise only. ENOB is
computed from:
ENOB
SINADdB
dB
dB
=
176
602
.
.
Dual 10-Bit, 20Msps, +3V, Low-Power ADC with
Internal Reference and Multiplexed Parallel Outputs
______________________________________________________________________________________
17
______________________________________________________________________________________
17
MAX1185
0.1
µF
1k
1k
100
100
CIN
22pF
CIN
22pF
INB+
INB-
COM
INA+
INA-
0.1
µF
RISO
50
RISO
50
REFP
REFN
VIN
MAX4108
0.1
µF
1k
1k
100
100
CIN
22pF
CIN
22pF
0.1
µF
RISO
50
RISO
50
REFP
REFN
VIN
MAX4108
Figure 7: Using an Op Amp for Single-Ended, AC-Coupled Input Drive


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