Electrical characteristics (continued) – Rainbow Electronics MAX1249 User Manual
Page 3
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
_______________________________________________________________________________________
3
Multiplexer Leakage Current
pF
15
C
IN
DIN, SCLK, CS Input Capacitance
µA
±0.01
±1
I
IN
DIN, SCLK, CS Input Leakage
V
0.2
V
HYST
DIN, SCLK, CS Input Hysteresis
V
0.8
V
IL
DIN, SCLK, CS Input Low Voltage
2.0
µA
0.01
10
Shutdown VREF Input Current
k
Ω
18
25
VREF Input Resistance
µA
100
150
VREF Input Current
V
1.0
V
DD
+
50mV
VREF Input Voltage Range
(Note 9)
pF
16
Input Capacitance
0 to VREF
V
±VREF / 2
Input Voltage Range, Single-
Ended and Differential (Note 6)
µA
±0.01
±1
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
(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
±4.0
I
S
SHDN Input Current
V
0.4
V
SL
SHDN Input Low Voltage
V
V
DD
- 0.4
V
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
V
2.470
2.500
2.530
VREF Output Voltage
T
A
= +25°C (Note 7)
mA
30
VREF Short-Circuit Current
ppm/°C
±30
VREF Temperature Coefficient
MAX1248
µF
0
Capacitive Bypass at VREF
Internal compensation mode
4.7
External compensation mode
mV
0.35
Load Regulation (Note 8)
0mA to 0.2mA output load
µF
0.01
Capacitive Bypass at REFADJ
±1.5
REFADJ 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
V
1.1
V
DD
- 1.1
V
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)