
mA
MAX1080/MAX1081
300ksps/400ksps, Single-Supply, Low-Power,
8-Channel, Serial 10-Bit ADCs with Internal Reference
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3
ELECTRICAL CHARACTERISTICS—MAX1080 (continued)
(VDD1 = VDD2 = +4.5V to +5.5V, COM = GND, fSCLK = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external
+2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
To power down the internal reference
For small adjustments, from 1.22V
0 to 1mA output load
On/off leakage current, VCH_ = 0 or VDD1
TA = +25
°C
Bipolar, VCOM or VCH_ = VREF/2, referenced
to COM or CH_
Unipolar, VCOM = 0
V/V
+2.05
Buffer Voltage Gain
V
1.4
VDD1 - 1.0
REFADJ Buffer Disable
Threshold
mV
±100
REFADJ Input Range
V
1.22
REFADJ Output Voltage
F
0.01
10
Capacitive Bypass at REFADJ
F
4.7
10
Capacitive Bypass at REF
mV/mA
0.1
2.0
Load Regulation (Note 7)
ppm/°C
±15
TC VREF
REF Output Temperature
Coefficient
mA
30
REF Short-Circuit Current
V
2.480
2.500
2.520
VREF
REF Output Voltage
pF
18
Input Capacitance
A
±0.001
±1
Multiplexer Leakage Current
±VREF/2
V
VREF
VCH_
Input Voltage Range, Single
Ended and Differential (Note 6)
VIN = 0 or VDD2
In power-down mode, fSCLK = 0
VREF = 2.500V, fSCLK = 0
VREF = 2.500V, fSCLK = 6.4MHz
(Note 8)
pF
CIN
Input Capacitance
A
±1
IIN
Input Leakage
V
0.2
VHYST
Input Hysteresis
V
0.8
VINL
Input Low Voltage
V
3.0
VINH
Input High Voltage
5
320
A
200
350
REF Input Current
V
1.0
VDD1 +
50mV
REF Input Voltage Range
ISINK = 5mA
V
0.4
VOL
Output Voltage Low
15
ISOURCE = 1mA
V
4
VOH
Output Voltage High
CS = 5V
A
±10
IL
Three-State Leakage Current
CS = 5V
pF
15
COUT
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)