MAX1139LEEE-T Maxim Integrated, MAX1139LEEE-T Datasheet - Page 20

• Manufacturer Part Number: MAX1139LEEE-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1139LEEE-T

• Number Of Channels: 12/6
• Architecture: SAR
• Conversion Rate: 94.4 KSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Differential
• Snr: Yes
• Interface Type: I2C
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Package / Case: QSOP-16
• Maximum Power Dissipation: 666.7 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: Internal 2.048 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