Datasheet

MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V (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
, C
REF
= 2.2µF, external +4.096V reference at REF (MAX1146/
MAX1148), external 2.500V reference at REF (MAX1147/MAX1149), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
18 clocks/conversion 60.3
Internal clock mode,
f
SCLK
= 2.1MHz
24 clocks/conversion 51.5
18 clocks/conversion 116.66
Throughput Rate
f
SAMPLE
External clock mode,
f
SCLK
= 2.1MHz
24 clocks/conversion 87.50
ksps
T/H Acquisition Time t
ACQ
1.4 µs
Aperture Delay t
AD
20 ns
Aperture Jitter t
AJ
<50
ps
External clock mode 0.1 2.1
Serial Clock Frequency f
SCLK
Internal clock mode 0 2.1
MHz
Internal Clock Frequency 2.1
MHz
ANALOG INPUTS (CH0–CH7, COM)
Unipolar, COM = 0 0
V
REF
Input Voltage Range, Single-
Ended and Differential (Note 6)
Bipolar, COM = V
REF
/ 2, single-ended
±V
REF
/ 2
V
Multiplexer Leakage Current On/off-leakage current, V
CH
_ = 0 to V
DD
±0.01
±1 µA
Input Capacitance 18 pF
INTERNAL REFERENCE (C
REF
= 2.2µF, C
REFADJ
= 0.01µF)
MAX1147/MAX1149, T
A
= +25°C
2.480 2.500 2.520
REF Output Voltage V
REF
MAX1146/MAX1148, T
A
= +25°C
4.076 4.096 4.116
V
REF Short-Circuit Current I
REFSC
REF = DGND 20 mA
MAX114_ BC _ _
±30 ±50
V
REF
Tempco (Note 7)
MAX114_ BE _ _
±40 ±60
ppm/°C
Load Regulation 0 to 0.2mA output load (Note 8) 2.0 mV
Capacitive Bypass at REF 2µF
Capacitive Bypass at REFADJ
0.01
µF
REFADJ Output Voltage
1.250
V
REFADJ Input Range
±18
mV
REFADJ Logic High
Pull REFADJ high to disable the internal
bandgap reference and reference buffer
V
DD
-
0.25V
V
MAX1147/MAX1149
2.000
Reference Buffer Voltage Gain
MAX1146/MAX1148
3.277
V/V