MCP3901A0T-E/ML Microchip Technology, MCP3901A0T-E/ML Datasheet - Page 21

• Manufacturer Part Number: MCP3901A0T-E/ML
• Description: IC AFE 24BIT 64KSPS 2CH 20QFN
• Manufacturer: Microchip Technology
• Series: -r

Specifications of MCP3901A0T-E/ML

• Number Of Bits: 24
• Number Of Channels: 2
• Power (watts): -
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.7 V ~ 5.5 V
• Package / Case: 20-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.8
Integral nonlinearity error is the maximum deviation of
an ADC transition point from the corresponding point of
an ideal transfer function, with the offset and gain
errors removed, or with the end points equal to zero.
It is the maximum remaining error after calibration of
offset and gain errors for a DC input signal.
4.9
For the MCP3901 ADC, the Signal-to-Noise ratio is a
ratio of the output fundamental signal power to the
noise power (not including the harmonics of the signal),
when the input is a sinewave at a predetermined
frequency. It is measured in dB. Usually, only the
maximum Signal-to-Noise ratio is specified. The SNR
calculation mainly depends on the OSR and DITHER
settings of the device.
EQUATION 4-4:
4.10
The most important figure of merit, for the analog
performance of the ADCs present on the MCP3901, is
the
specification.
Signal-to-Noise and distortion ratio are similar to the
Signal-to-Noise ratio, with the exception that you must
include the harmonics power in the noise power
calculation. The SINAD specification mainly depends
on the OSR and DITHER settings.
EQUATION 4-5:
The calculated combination of SNR and THD per the
following formula also yields SINAD:
EQUATION 4-6:
© 2011 Microchip Technology Inc.
SINAD dB
SINAD dB
Signal-to-Noise
SNR dB
Integral Nonlinearity Error
Signal-to-Noise Ratio (SNR)
Signal-to-Noise Ratio And
Distortion (SINAD)
(
(
(
)
=
)
)
10
=
=
log
10
10
SIGNAL-TO-NOISE RATIO
SINAD EQUATION
SINAD, THD AND SNR
RELATIONSHIP
⎛
⎝
log
log
-------------------------------------------------------------------- -
Noise
and
⎛
⎝
SignalPower
--------------------------------- -
10
NoisePower
⎛
⎝
+
SignalPower
SNR
---------- -
10
HarmonicsPower
Distortion
⎞
⎠
+
10
⎛
⎝
⎞
⎠
–
--------------- -
THD
10
(SINAD)
⎞
⎠
⎞
⎠
4.11
The total harmonic distortion is the ratio of the output
harmonic’s power to the fundamental signal power for
a sinewave input and is defined by
EQUATION 4-7:
The THD calculation includes the first 35 harmonics for
the MCP3901 specifications. The THD is usually only
measured with respect to the 10 first harmonics. THD
is sometimes expressed in %. For converting the THD
in %, here is the formula:
EQUATION 4-8:
This specification depends mainly on the DITHER
setting.
4.12
SFDR is the ratio between the output power of the
fundamental and the highest spur in the frequency
spectrum. The spur frequency is not necessarily a
harmonic of the fundamental, even though it is usually
the case. This figure represents the dynamic range of
the ADC when a full-scale signal is used at the input.
This specification depends mainly on the DITHER
setting.
EQUATION 4-9:
THD dB
SFDR dB
Total Harmonic Distortion (THD)
Spurious-Free Dynamic Range
(SFDR)
(
(
THD %
)
=
)
=
( )
10
10
log
=
log
⎛
⎝
---------------------------------------------------- -
FundamentalPower
100 10
⎛
⎝
HarmonicsPower
FundamentalPower
---------------------------------------------------- -
HighestSpurPower
×
MCP3901
THD dB
------------------------
Equation
DS22192D-page 21
20
(
)
4-7:
⎞
⎠
⎞
⎠