Datasheet
Effective Number of Bits
Effective number of bits (ENOB) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC error consists of quantiza-
tion noise only. With an input range equal to the full-
scale range of the ADC, calculate the effective number
of bits as follows:
ENOB = (SINAD - 1.76)/6.02
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the RMS
sum of the first five harmonics of the input signal to the
fundamental itself. This is expressed as:
where V1 is the fundamental amplitude, and V2–V5 are
the amplitudes of the first five harmonics.
Spurious-Free Dynamic Range
Spurious-free dynamic range (SFDR) is the ratio of the
RMS amplitude of the fundamental (maximum signal
component) to the RMS value of the next-largest distor-
tion component.
THD 20 x log V V V V / V
2
2
3
2
4
2
5
2
1
= +++
()
⎛
⎝
⎜
⎞
⎠
⎟
MAX1027/MAX1029/MAX1031
10-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
______________________________________________________________________________________ 21
Ordering Information (continued)
Pin Configurations (continued)
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
EOC
DOUT
DIN
CSAIN3
AIN2
AIN1
AIN0
SCLK
V
DD
GND
REF+AIN7
AIN6
AIN5
AIN4
16
15
14
13
9
10
11
12
CNVST/AIN15
REF-/AIN14
AIN13
AIN12AIN11
AIN10
AIN9
AIN8
QSOP
MAX1031
+
26
27
25
24
10
9
11
AIN3
AIN5
AIN6
AIN7
AIN8
12
N.C.
SCLK
V
DD
N.C.
CS
GND
REF+
12
N.C.
4567
2021 19 17 16 15
AIN0
AIN1
AIN13
AIN12
AIN11
AIN10
MAX1031
AIN4
N.C.
3
18
28
8
AIN2
AIN9
EOC
23
13
REF-/AIN14
DOUT
22
14
CNVST/AIN15
DIN
TQFN
+
TOP VIEW
*
EP = Exposed pad (connect to GND).
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages
. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PART TEMP RANGE PIN-PACKAGE
MAX1031BCEG+T 0°C to +70°C 24 QSOP
MAX1031BEEG+T -40°C to +85°C 24 QSOP
MAX1031BCTI+T 0°C to +70°C 28
TQF
N-EP*
MAX1031BETI+T -40°C to +85°C 28 TQFN-EP*
PACKAGE
TYPE
PACKAG
E CODE
D O C U M EN T
N O .
LA ND
PA TTERN NO.
16 QSOP E16+5 90-0167
20 QSOP E20+3 90-0168
24 QSOP E24+3
21-0055
90-0172
28 TQFN-EP T2855+8 21-0140 90-0026