Datasheet

MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
8 _______________________________________________________________________________________
REFERENCE VOLTAGE vs. SUPPLY VOLTAGE
(MAX1146/MAX1148)
MAX1146 toc10
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
5.155.054.85 4.95
4.0945
4.0950
4.0955
4.0960
4.0965
4.0970
4.0975
4.0980
4.0940
4.75 5.25
REFERENCE VOLTAGE vs. SUPPLY VOLTAGE
(MAX1147/MAX1149)
MAX1146 toc11
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
3.33.0
2.4985
2.4990
2.4995
2.5000
2.5005
2.5010
2.5015
2.5020
2.4980
2.7 3.6
REFERENCE VOLTAGE vs. TEMPERATURE
(MAX1146/MAX1148)
MAX1146 toc12
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
603510-15
4.091
4.092
4.093
4.094
4.095
4.096
4.097
4.098
4.099
4.100
4.090
-40 85
REFERENCE VOLTAGE vs. TEMPERATURE
(MAX1147/MAX1149)
MAX1146 toc13
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
603510-15
2.498
2.499
2.500
2.501
2.502
2.503
2.497
-40 85
REFERENCE BUFFER POWER-UP DELAY
vs. TIME IN SHUTDOWN
MAX1146 toc14
TIME IN SHUTDOWN (s)
DELAY (µs)
10.10.01
500
1000
1500
2000
2500
0
0.001 10
C
REF
= 4.7µF
C
REFADJ
= 0.01µF
FFT PLOT
MAX1146 toc15
FREQUENCY (Hz)
AMPLITUDE (dB)
50004000300020001000
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
-120
0
f
IN
= 1kHz
f
SAMPLE
= 116ksps
V
DD
= 5V/3V
EFFECTIVE NUMBER OF BITS
vs. FREQUENCY
MAX1146 toc16
FREQUENCY (kHz)
EFFECTIVE NUMBER OF BITS
4637281910
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
13.0
12.0
155
Typical Operating Characteristics (continued)
(V
DD
= +5.0V (MAX1146/MAX1148), V
DD
= +3.3V (MAX1147/MAX1149), SHDN = V
DD
, V
COM
= 0, f
SCLK
= 2.1MHz, external clock
(50% duty cycle), 18 clocks/conversion (116ksps), V
REFADJ
= V
DD
, external +4.096V reference at REF (MAX1146/MAX1148), exter-
nal +2.500V reference at REF (MAX1147/MAX1149), C
REF
= 2.2µF, C
LOAD
= 50pF, T
A
= +25°C, unless otherwise noted.)