Datasheet

MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5.0V ±5%; unipolar/bipolar range; external reference mode, V
REF
= +4.096V; 4.7µF at REF; external clock; f
CLK
= 2.0MHz,
50% duty cycle (MAX127_B); f
CLK
= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT
MAX127_A, f
CLK
= 1.8MHz 3.3
Track/Hold Acquisition Time t
ACQ
MAX127_B, f
CLK
= 2.0MHz 3.0
µs
±10V or ±V
REF
range
5
±5V or ±V
REF
/2
range
2.5
0 to 10V or 0 to
V
REF
range
2.5
Small-Signal Bandwidth -3dB rolloff
0 to 5V or 0 to
V
REF
/2 range
1.25
MHz
RNG = 1 0 10
MAX1270
RNG = 0 0 5
RNG = 1 0
V
REF
Unipolar (BIP =
0), Table 3
MAX1271
RNG = 0 0
V
REF
/2
RNG = 1 -10
+10
MAX1270
RNG = 0 -5 +5
RNG = 1
-V
REF
+V
REF
Input Voltage Range
(Table 3)
V
IN
Bipolar (BIP =
1), Table 3
MAX1271
RNG = 0
-V
REF
/2
+V
REF
/
2
V
0 to 10V
range
-10
+720
MAX1270
0 to 5V
range
-10
+360
Unipolar
MAX1271 -10 0.1
+10
±10V
range
-1200 +720
MAX1270
±5V range -600 +360
±V
REF
range
-1200 +10
Input Current I
IN
Bipolar
MAX1271
±V
REF
/2
range
-600 +10
µA
Unipolar 21
Dynamic Resistance
∆V
IN
/∆I
IN
Bipolar 16
kΩ
Input Capacitance (Note 4) 40 pF