User Manual

MAX1144/MAX1145
14-Bit ADCs, 150ksps, 3.3V Single Supply
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS (Figures 5 and 6) (continued)
(AV
DD
= DV
DD
= 3.3V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Note 1: Tested at AV
DD
= DV
DD
= 3.3V, bipolar input mode.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and offset
error have been nullified.
Note 3: Offset nullified.
Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. Includes
the acquisition time.
Note 5: Acquisition time is 5 clock cycles in short acquisition mode and 13 clock cycles in long acquisition mode.
Note 6: Performance is limited by the converter’s noise floor, typically 300µV
P-P
.
Note 7: When an external reference has a different voltage than the specified typical value, the full scale of the ADC scales propor-
tionally.
Note 8: Defined as the change in positive full scale caused by a ±5% variation in the nominal supply voltage.
Typical Operating Characteristics
(MAX1144/MAX1145, AV
DD
= DV
DD
= 3.3V, f
SCLK
= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps),
bipolar input, REF = 2.048V, 4.7µF on REF, 1µF on CREF, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1144/45 toc01
DIGITAL OUTPUT CODE
INTEGRAL NONLINEARITY (LSB)
13649
119438531
102373413
5119
6825
1707
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
1
15355
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1144/45 toc02
DIGITAL OUTPUT CODE
DIFFERENTIAL NONLINEARITY (LSB)
13649
119438531
102373413
5119
6825
1707
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
1
15355
TOTAL SUPPLY CURRENT
vs. TEMPERATURE
MAX1144/45 toc03
TEMPERATURE (
°
C)
TOTAL SUPPLY CURRENT (mA)
806020 400-20
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
9.0
8.0
-40
A: AV
DD
, DV
DD
= 3.135V
B: AV
DD
, DV
DD
= 3.3V
C: AV
DD
, DV
DD
= 3.465V
C
B
A