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| MAX1248 Datasheet, PDF (3/24 Pages) Maxim Integrated Products – 2x4-Channel, Simultaneous-Sampling 14-Bit DAS | |||
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+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V; COM = 0V; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX1248â4.7µF capacitor at VREF pin; MAX1249âexternal reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX,
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ANALOG/COM INPUTS
Input Voltage Range, Single-
Ended and Differential (Note 6)
Multiplexer Leakage Current
Input Capacitance
Unipolar, COM = 0V
Bipolar, COM = VREF / 2
On/off leakage current, VCH_ = 0V or VDD
0 to VREF
V
±VREF / 2
±0.01 ±1
µA
16
pF
INTERNAL REFERENCE (MAX1248 only, reference buffer enabled)
VREF Output Voltage
TA = +25°C (Note 7)
VREF Short-Circuit Current
VREF Temperature Coefficient
MAX1248
2.470
2.500
±30
2.530 V
30
mA
ppm/°C
Load Regulation (Note 8)
Capacitive Bypass at VREF
Capacitive Bypass at REFADJ
REFADJ Adjustment Range
0mA to 0.2mA output load
Internal compensation mode
External compensation mode
0.35
mV
0
µF
4.7
0.01
µF
±1.5
%
EXTERNAL REFERENCE AT VREF (Buffer disabled)
VREF Input Voltage Range
(Note 9)
1.0
VDD +
50mV
V
VREF Input Current
VREF Input Resistance
Shutdown VREF Input Current
VREF = 2.500V
100
150
µA
18
25
kâ¦
0.01
10
µA
REFADJ Buffer-Disable Threshold
VDD -
0.5
V
EXTERNAL REFERENCE AT REFADJ
Capacitive Bypass at VREF
Reference-Buffer Gain
REFADJ Input Current
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
DIN, SCLK, CS Input High Voltage VIH
DIN, SCLK, CS Input Low Voltage
DIN, SCLK, CS Input Hysteresis
DIN, SCLK, CS Input Leakage
DIN, SCLK, CS Input Capacitance
SHDN Input High Voltage
SHDN Input Mid Voltage
SHDN Input Low Voltage
SHDN Input Current
VIL
VHYST
IIN
CIN
VSH
VSM
VSL
IS
Internal compensation mode
External compensation mode
MAX1248
MAX1249
MAX1248
MAX1249
VDD ⤠3.6V
VDD > 3.6V
VIN = 0V or VDD
(Note 10)
SHDN = 0V or VDD
0
µF
4.7
2.06
V/V
2.00
±50
µA
±10
2.0
V
3.0
0.8
V
0.2
V
±0.01 ±1
µA
15
pF
VDD - 0.4
V
1.1
VDD - 1.1
V
0.4
V
±4.0 µA
_______________________________________________________________________________________ 3
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