Rainbow Electronics MAX1145 - Manual (Page 3)

MAX1144/MAX1145
14-Bit ADCs, 150ksps, 3.3V Single Supply
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ELECTRICAL CHARACTERISTICS (continued)
(AV DD = DV DD = 3.3V ±5%, f SCLK = 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, V REF =
2.048V, C REF = 4.7µF, 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 10.5
MAX1144
Bipolar 5.9 8.4
Unipolar 100 1000
Input Impedance
MAX1145
Bipolar 3.4 5.3
k Ω
Input Capacitance 32 pF
CONVERSION RATE
Internal Clock Frequency 3 MHz
Aperture Delay t AD 10 ns
Aperture Jitter t AJ 50 ps
MODE 1 (24 EXTERNAL CLOCK CYCLES PER CONVERSION)
Unipolar 0.1 3.0
External Clock Frequency f SCLK
Bipolar 0.1 3.6
MHz
Unipolar 4.17 125
Sample Rate
f S =
f SCLK / 24 Bipolar 4.17 150
ksps
Unipolar 8 240
Conversion Time (Note 4)
t CONV+ACQ
= 24 / f SCLK Bipolar 6.7 240
µs
MODE 2 (INTERNAL CLOCK)
External Clock Frequency
(Data Transfer Only)
4 MHz
Conversion Time (SSTRB low pulse width) 5.3 7 µs
Unipolar 1.67
Acquisition Time (Note 5)
Bipolar 1.39
µs
MODE 3 (32 EXTERNAL CLOCK CYCLES PER CONVERSION)
External Clock Frequency f SCLK Unipolar or bipolar 0.1 3.6 MHz
Sample Rate
f S =
f SCLK / 32
Unipolar or bipolar 3.125 112 ksps
Conversion Time (Note 4)
t CONV+ACQ
= 32 / f SCLK
Unipolar or bipolar 8.89 320 µs
EXTERNAL REFERENCE
Input Range (Notes 6, 7) 1.9 2.048 2.2 V
V REF = 2.048V, f SCLK = 3.6MHz 110
V REF = 2.048V, f SCLK = 0 100 Input Current
In power-down, f SCLK = 0 0.1
µA
DIGITAL INPUTS
Input High Voltage V IH 2.4 V
Input Low Voltage V IL 0.8 V
Input Leakage I IN V IN = 0 or DV DD -1 +1 µA