+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
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.)
PARAMETER
ANALOG/COM INPUTS
Input Voltage Range, Single-
Ended and Differential (Note 6)
Multiplexer Leakage Current
Input Capacitance
INTERNAL REFERENCE
(MAX1248 only, reference buffer enabled)
VREF Output Voltage
VREF Short-Circuit Current
VREF Temperature Coefficient
Load Regulation (Note 8)
Capacitive Bypass at VREF
Capacitive Bypass at REFADJ
REFADJ Adjustment Range
EXTERNAL REFERENCE AT VREF
(Buffer disabled)
VREF Input Voltage Range
(Note 9)
VREF Input Current
VREF Input Resistance
Shutdown VREF Input Current
REFADJ Buffer-Disable Threshold
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
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
V
IH
V
IL
V
HYST
I
IN
C
IN
V
SH
V
SM
V
SL
I
S
SHDN
= 0V or V
DD
V
IN
= 0V or V
DD
(Note 10)
V
DD
- 0.4
1.1
V
DD
- 1.1
0.4
±4.0
0.2
±0.01
±1
15
V
DD
≤
3.6V
V
DD
> 3.6V
2.0
3.0
0.8
V
V
V
µA
pF
V
V
V
µA
Internal compensation mode
External compensation mode
MAX1248
MAX1249
MAX1248
MAX1249
0
4.7
2.06
2.00
±50
±10
µF
V/V
µA
V
DD -
0.5
VREF = 2.500V
18
1.0
100
25
0.01
10
V
DD
+
50mV
150
V
µA
kΩ
µA
V
MAX1248
0mA to 0.2mA output load
Internal compensation mode
External compensation mode
0
4.7
0.01
±1.5
±30
0.35
T
A
= +25°C (Note 7)
2.470
2.500
2.530
30
V
mA
ppm/°C
mV
µF
µF
%
SYMBOL
CONDITIONS
Unipolar, COM = 0V
Bipolar, COM = VREF / 2
On/off leakage current, V
CH_
= 0V or V
DD
MIN
TYP
MAX
UNITS
MAX1248/MAX1249
0 to VREF
±VREF / 2
±0.01
±1
16
V
µA
pF
_______________________________________________________________________________________
3