Rainbow Electronics MAX1143 - Manual (Page 3)

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
k
Ω
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