Datasheet
MAX1142/MAX1143
14-Bit ADC, 200ksps, +5V Single-Supply
with Reference
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ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +5V ±5%, f
SCLK
= 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external
V
REF
= +4.096V, V
REFADJ
= AV
DD
, C
REF
= 2.2µF, C
CREF
= 1µF, 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
Unipolar 7.5 10.0
MAX1142
Bipolar 5.9 7.9
Unipolar 100 1000
Input Impedance
MAX1143
Bipolar 3.4 4.5
kΩ
Input Capacitance 32 pF
CONVERSION RATE
Internal Clock Frequency 4 MHz
Aperture Delay t
AD
10 ns
Aperture Jitter t
AJ
50 ps
MODE 1 (24 External Clock Cycles per Conversion)
Unipolar 0.1 3
External Clock Frequency f
SCLK
Bipolar 0.1 4.8
MHz
Unipolar 4.17 125
Sample Rate f
S
= f
SCLK
/24
Bipolar 4.17 200
ksps
Unipolar 8 240
Conversion Time (Note 4)
t
CONV+ACQ
=
24 / f
SCLK Bipolar 5 240
µs
MODE 2 (Internal Clock Mode)
External Clock Frequency
(Data Transfer Only)
8 MHz
Conversion Time SSTRB Low Pulse Width 4 6 µs
Unipolar 1.82
Acquisition Time
Bipolar 1.14
µs
MODE 3 (32 External Clock Cycles per Conversion)
External Clock Frequency f
SCLK
Unipolar or Bipolar 0.1 4.8 MHz
Sample Rate f
S
= f
SCLK
/32 Unipolar or Bipolar 3.125 150 ksps
Conversion Time (Note 4)
t
CONV+ACQ
=
32 / f
SCLK
Unipolar or Bipolar 6.67 320 µs
INTERNAL REFERENCE
Output Voltage V
REF
4.056 4.096 4.136 V
REF Short Circuit Current 24 mA
Output Tempco ±20 ppm/
o
C
Capacitive Bypass at REF 0.47 10 µF
Maximum Capacitive Bypass at
REFADJ
10 µF
REFADJ Output Voltage 4.096 V
REFADJ Input Range For small adjustments from 4.096V ±100 mV