MAX1138MEEE+T Maxim Integrated, MAX1138MEEE+T Datasheet - Page 20

• Manufacturer Part Number: MAX1138MEEE+T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1138MEEE+T

• Rohs: yes
• Number Of Channels: 12/6
• Architecture: SAR
• Conversion Rate: 94.4 KSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Differential
• Interface Type: I2C
• Operating Supply Voltage: 4.5 V to 5.5 V
• Number Of Converters: 1
• Voltage Reference: Internal 4.096 V

Effective number of bits (ENOB) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC’s error consists of quanti-
zation noise only. With an input range equal to the
ADC’s full-scale range, calculate the ENOB as follows:
Total harmonic distortion (THD) is the ratio of the RMS
sum of the input signal’s first five harmonics to the fun-
damental itself. This is expressed as:
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs
20
______________________________________________________________________________________
SINAD dB
(
ENOB = (SINAD - 1.76)/6.02
)
=
20
×
log
Total Harmonic Distortion
Effective Number of Bits
⎡
⎢
⎣
NoiseRMS THDRMS
SignalRMS
+
⎤
⎥
⎦
where V
are the amplitudes of the 2nd through 5th order harmonics.
Spurious-free dynamic range (SFDR) is the ratio of RMS
amplitude of the fundamental (maximum signal compo-
nent) to the RMS value of the next largest distortion
component.
1
THD
is the fundamental amplitude, and V
=
20
Spurious-Free Dynamic Range
×
log
⎛
⎜
⎜
⎜
⎝
⎛
⎜
⎜
⎝
V
2
2
+
V
3
2
V
+
1
V
4
2
+
V
5
2
⎞
⎟
⎟
⎠
2
⎞
⎟
⎟
⎟
⎠
through V
5