Datasheet

+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
4
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V; COM = 0; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX149—4.7FF capacitor at V
REF
pin; MAX148—external reference, V
REF
= 2.500V applied to V
REF
pin; T
A
= T
MIN
to T
MAX
, unless
otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
DIN, SCLK, CS Input High Voltage V
IH
V
DD
≤ 3.6V 2.0
V
V
DD
> 3.6V 3.0
DIN, SCLK, CS Input Low Voltage V
IL
0.8 V
DIN, SCLK, CS Input Hysteresis V
HYST
0.2 V
DIN, SCLK, CS Input Leakage I
IN
V
IN
= 0 or V
DD
±0.01 ±1 μA
DIN, SCLK, CS Input Capacitance C
IN
(Note 10) 15 pF
SHDN Input High Voltage V
SH
V
DD
-
0.4
V
SHDN Input Mid Voltage V
SM
1.1
V
DD
-
1.1
V
SHDN Input Low Voltage V
SL
0.4 V
SHDN Input Current I
S
SHDN = 0 or V
DD
±4.0 μA
SHDN Voltage, Unconnected V
FLT
SHDN = unconnected V
DD
/2 V
SHDN Maximum Allowed
Leakage, Mid Input
SHDN = unconnected ±100 nA
DIGITAL OUTPUTS (DOUT, SSTRB)
Output-Voltage Low V
OL
I
SINK
= 5mA 0.4
V
I
SINK
= 16mA 0.8
Output-Voltage High V
OH
I
SOURCE
= 0.5mA
V
DD
-
0.5
V
Three-State Leakage Current I
L
CS = V
DD
±0.01 ±10 μA
Three-State Output Capacitance C
OUT
CS = V
DD
(Note 10) 15 pF
POWER REQUIREMENTS
Positive Supply Voltage V
DD
2.70 5.25 V
Positive Supply Current I
DD
Operating mode, full-scale
input (Note 11)
V
DD
= 5.25V 1.6 3.0
mA
V
DD
= 3.6V 1.2 2.0
Full power-down
V
DD
= 5.25V 3.5 15
μAV
DD
= 3.6V 1.2 10
Fast power-down (MAX149) 30 70
Supply Rejection (Note 12) PSR
Full-scale input, external reference =
2.500V, V
DD
= 2.7V to 5.25V
±0.3 mV