Datasheet

MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX146); V
DD
= +2.7V to +5.25V (MAX147); COM = 0; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15
clocks/conversion cycle (133ksps); MAX146—4.7µF capacitor at VREF pin; MAX147—external reference, VREF = 2.500V applied to
VREF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
CONDITIONSPARAMETER SYMBOL MIN TYP MAX UNITS
µs1.5t
ACQ
Track/Hold Acquisition Time
0.1 2.0
1.8
ns
MHz
SHDN = FLOAT
MHz
30
0.225
Aperture Delay
Internal Clock Frequency
SHDN = V
DD
0 2.0
External Clock Frequency
Data transfer only
ps<50Aperture Jitter
On/off leakage current, V
CH_
= 0V or V
DD
Bipolar, COM = VREF / 2
Unipolar, COM = 0V
±0.01 ±1 µA
Input Voltage Range, Single-
Ended and Differential (Note 6)
±VREF / 2
V
0 to VREF
Multiplexer Leakage Current
REFADJ Adjustment Range ±1.5 %
Capacitive Bypass at REFADJ 0.047 µF
External compensation mode
Capacitive Bypass at VREF
4.7
µF
Internal compensation mode 0
0 to 0.2mA output loadLoad Regulation (Note 7) 0.35 mV
MAX146_M
VREF Temperature Coefficient
±30 ±80
ppm/°CMAX146_E ±30 ±60
MAX146_C ±30 ±50
VREF Short-Circuit Current 30 mA
T
A
= +25°CVREF Output Voltage 2.480 2.500 2.520 V
Input Capacitance 16 pF
VREF Input Voltage Range
(Note 8)
1.0
V
DD
+
50mV
V
External compensation mode
MAX146
4.7
Reference Buffer Gain
2.06
V/V
Internal compensation mode
Capacitive Bypass at VREF
0
µF
REFADJ Buffer Disable Threshold
V
DD
-
0.5
V
VREF = 2.5VVREF Input Current 100 150 µA
VREF Input Resistance 18 25 kΩ
Shutdown VREF Input Current 0.01 10 µA
MAX147
MAX146
MAX147
REFADJ Input Current
2.00
±50
±10
µA
ANALOG/COM INPUTS
INTERNAL REFERENCE (MAX146 only, reference buffer enabled)
EXTERNAL REFERENCE AT VREF (Buffer disabled)
EXTERNAL REFERENCE AT REFADJ