Datasheet

MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
REF
= 2.5V, 0.1µF capacitor at REF, f
SCLK
= 2.17MHz, 16 clocks/conversion cycle (108ksps),
CH- = GND for MAX145, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
V
REF
= 2.5V
On/off leakage current, V
IN
= 0 to V
DD
kΩ18 25Input Resistance
µA100 140
V
0V
DD
+ 50mV
V
REF
Input Voltage Range
Input Current
µA0.01 10
CONDITIONS
Shutdown REF Input Current
µA±0.01 ±1Multiplexer Leakage Current
V0V
REF
V
IN
Analog Input Voltage Range
pF16C
IN
Input Capacitance
UNITS
MIN TYP MAX
SYMBOLPARAMETER
Input Leakage Current I
IN
±1 µA
Input Hysteresis V
HYS
0.2 V
0.2 5 µA
Input High Voltage V
IH
2.0
V
3.0
Input Low Voltage V
IL
0.8 V
Positive Supply Current I
DD
0.9 2.0 mA
Three-State Output Capacitance C
OUT
15 pF
Positive Supply Voltage V
DD
2.7 5.25 V
Power-Supply Rejection
Shutdown, CS/SHDN = GND
Operating mode
PSR ±0.15 mV
CS/SHDN = V
DD
(Note 8)
V
DD
= 2.7V to 5.25V,
V
REF
= 2.5V, full-scale input (Note 9)
Three-State Output Leakage
Current
±10 µA
Output High Voltage V
OH
V
DD
- 0.5 V
Output Low Voltage
Input Capacitance
V
IN
= 0 or V
DD
C
IN
15 pF
V
OL
0.4
V
0.5
V
DD
≤ 3.6V
V
DD
> 3.6V
CS/SHDN = V
DD
I
SOURCE
= 0.5mA
(Note 8)
I
SINK
= 5mA
I
SINK
= 16mA
ANALOG INPUTS
EXTERNAL REFERENCE
DIGITAL INPUTS (CS/SHDN) AND OUTPUT (DOUT)
POWER REQUIREMENTS
(Note 6)
(Note 7)