MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
_______________________________________________________________________________________ 3
Multiplexer Leakage Current
pF15C
IN
DIN, SCLK, CS Input Capacitance
µA±0.01 ±1I
IN
DIN, SCLK, CS Input Leakage
V0.2V
HYST
DIN, SCLK, CS Input Hysteresis
V0.8V
IL
DIN, SCLK, CS Input Low Voltage
2.0
µA0.01 10Shutdown VREF Input Current
kΩ18 25VREF Input Resistance
µA100 150VREF Input Current
V
1.0
V
DD
+
50mV
VREF Input Voltage Range
(Note 9)
pF16Input Capacitance
0 to VREF
V
±VREF / 2
Input Voltage Range, Single-
Ended and Differential (Note 6)
µA±0.01 ±1
UNITSMIN TYP MAXSYMBOLPARAMETER
(Note 10)
V
IN
= 0V or V
DD
Unipolar, COM = 0V
V
DD
≤ 3.6V
VREF = 2.500V
Bipolar, COM = VREF / 2
On/off leakage current, V
CH_
= 0V or V
DD
CONDITIONS
µA±4.0I
S
SHDN Input Current
V0.4V
SL
SHDN Input Low Voltage
VV
DD
- 0.4V
SH
SHDN Input High Voltage
SHDN = 0V or V
DD
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V; COM = 0V; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference, VREF = 2.500V applied to VREF pin; T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
V
3.0
V
IH
DIN, SCLK, CS Input High Voltage
V
DD
> 3.6V
V2.470 2.500 2.530VREF Output Voltage T
A
= +25°C (Note 7)
mA30VREF Short-Circuit Current
ppm/°C±30VREF Temperature Coefficient MAX1248
µF
0
Capacitive Bypass at VREF
Internal compensation mode
4.7External compensation mode
mV0.35Load Regulation (Note 8) 0mA to 0.2mA output load
µF0.01Capacitive Bypass at REFADJ
±1.5REFADJ Adjustment Range %
V
V
DD -
0.5
REFADJ Buffer-Disable Threshold
Capacitive Bypass at VREF
Internal compensation mode 0
µF
External compensation mode 4.7
Reference-Buffer Gain
MAX1248 2.06
V/V
MAX1249 2.00
REFADJ Input Current
MAX1248 ±50
µA
MAX1249 ±10
V1.1 V
DD
- 1.1V
SM
SHDN Input Mid Voltage
ANALOG/COM INPUTS
EXTERNAL REFERENCE AT VREF (Buffer disabled)
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
EXTERNAL REFERENCE AT REFADJ
INTERNAL REFERENCE (MAX1248 only, reference buffer enabled)
(28 Seiten)
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