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| MAX1270BCAI Datasheet, PDF (3/20 Pages) Maxim Integrated Products – Multirange, +5V, 8-Channel, Serial 12-Bit ADCs | |||
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Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5.0V ±5%; unipolar/bipolar range; external reference mode, VREF = +4.096V; 4.7µF at REF; external clock; fCLK = 2.0MHz,
50% duty cycle (MAX127_B); fCLK = 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, TA = TMIN to TMAX, unless
otherwise noted. Typical values are TA = +25°C.)
PARAMETER
ANALOG INPUT
Track/Hold Acquisition Time
SYMBOL
CONDITIONS
tACQ
MAX127_A, fCLK = 1.8MHz
MAX127_B, fCLK = 2.0MHz
±10V or ±VREF
range
MIN TYP MAX UNITS
3.3
µs
3.0
5
Small-Signal Bandwidth
Input Voltage Range
(Table 3)
-3dB rolloff
±5V or ±VREF/2
range
0 to 10V or 0 to
VREF range
2.5
MHz
2.5
0 to 5V or 0 to
VREF/2 range
1.25
RNG = 1
0
MAX1270
Unipolar (BIP =
RNG = 0
0
0), Table 3
RNG = 1
0
MAX1271
RNG = 0
0
10
5
VREF
VREF/2
VIN
RNG = 1
-10
MAX1270
RNG = 0
-5
Bipolar (BIP =
1), Table 3
RNG = 1
-VREF
MAX1271
RNG = 0 -VREF/2
+10
V
+5
+VREF
+VREF/
2
Input Current
Dynamic Resistance
Input Capacitance
Unipolar
IIN
Bipolar
âVIN/âIIN
Unipolar
Bipolar
(Note 4)
0 to 10V
range
-10
MAX1270
0 to 5V
-10
range
+720
+360
MAX1271
-10
0.1
+10
MAX1270
±10V
range
±5V range
-1200
-600
+720
µA
+360
±VREF
-1200
+10
range
MAX1271
±VREF/2
-600
+10
range
21
kâ¦
16
40
pF
_______________________________________________________________________________________ 3
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