Datasheet

MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, V
REF
= 4.096V, C
REF
= 1.0μF, f
SCLK
= 1.4MHz,
50% duty cycle, C
LOAD
= 50pF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
±10V (MAX1272) or ±V
REF
(MAX1273)
range
5
±5V (MAX1272) or ±V
REF
/2 (MAX1273)
range
2.5
0 to 10V (MAX1272) or 0 to V
REF
(MAX1273)
range
2.5
Small-Signal Bandwidth BW
-3dB
0 to 5V (MAX1272) or 0 to V
REF
/2
(MAX1273) range
1.25
MHz
RNG = 1 0 10
MAX1272
RNG = 0 0 5
RNG = 1 0 V
REF
Unipolar
MAX1273
RNG = 0 0 V
REF
/2
RNG = 1 -10 +10
MAX1272
RNG = 0 -5 +5
RNG = 1 -V
REF
+V
REF
Input Voltage Range
(Tables 2, 3)
V
IN
Bipolar
MAX1273
RNG = 0 -V
REF
/2 +V
REF
/2
V
0 to 10V range -10 +860
MAX1272
0 to 5V range -10 +430
0 to V
REF
range -10 +10
Unipolar
MAX1273
0 to V
REF
/2 range -10 +10
±10V range -1400 +860
MAX1272
±5V range -720 +430
±V
REF
range -1400 +10
Input Current I
IN
Bipolar
MAX1273
±V
REF
/2 range -720 +10
μA
Input Capacitance 40 pF
INTERNAL REFERENCE
REF Output Voltage V
REF
T
A
= +25°C 4.036 4.096 4.156 V
MAX127_ C ±15
REF Output Tempco TC V
REF
MAX127_ E ±30
ppm/°C
Output Short-Circuit Current REF shorted to GND 40 mA
Load Regulation 0 to 0.5mA output current 0.7 10 mV
Capacitive Bypass at REF 1μF
REFERENCE INPUT (Reference buffer disabled, reference input applied to REF)
Input Voltage Range 2.40 4.18 V