Datasheet

mA
MAX1280/MAX1281
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
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ELECTRICAL CHARACTERISTICS—MAX1280 (continued)
(V
DD1
= V
DD2
= +4.5V to +5.5V, COM = GND, f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external
+2.5V at REF, REFADJ = V
DD1
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
To power down the internal reference
For small adjustments, from 1.22V
0 to 1mA output load
On/off leakage current, V
CH_
= 0 or V
DD1
T
A
= +25°C
Bipolar, V
COM
or V
CH_
= V
REF
/2,
referenced to COM or CH_
Unipolar, V
COM
= 0
V/V
2.05
Buffer Voltage Gain
V
1.33 V
DD1
REFADJ Buffer Disable
Threshold
mV
±50
REFADJ Input Range
V
1.22
REFADJ Output Voltage
µF
0.01 10
Capacitive Bypass at REFADJ
µF
4.7 10
Capacitive Bypass at REF
mV/mA
0.1 2.0
Load Regulation (Note 7)
ppm/°C
±15
TC V
REF
REF Output Temperature
Coefficient
mA
30
REF Short-Circuit Current
V
2.480 2.500 2.520
V
REF
REF Output Voltage
pF18Input Capacitance
µA
±0.001 ±1
Multiplexer Leakage Current
±V
REF
/2
V
V
REF
V
CH_
Input Voltage Range, Single-
Ended and Differential (Note 6)
V
IN
= 0 or V
DD2
In power-down, f
SCLK
= 0
V
REF
= 2.500V, f
SCLK
= 0
V
REF
= 2.500V, f
SCLK
= 6.4MHz
(Note 8)
pFC
IN
Input Capacitance
µA±1I
IN
Input Leakage
V0.2V
HYST
Input Hysteresis
V0.8V
INL
Input Low Voltage
V3.0V
INH
Input High Voltage
5
320
µA
200 350
REF Input Current
V
1.0 V
DD1
+
50mV
REF Input Voltage Range
I
SINK
= 5mA V0.4V
OL
Output Voltage Low
15
I
SOURCE
= 1mA V4V
OH
Output Voltage High
CS = 5V
µA±10I
L
Three-State Leakage Current
CS = 5V
pF15C
OUT
Three-State Output Capacitance
ANALOG INPUTS (CH7–CH0, COM)
EXTERNAL REFERENCE (Reference buffer disabled, reference applied to REF)
INTERNAL REFERENCE
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
DIGITAL OUTPUTS (DOUT, SSTRB)