MAX1146 Datasheet, PDF (4/25 Pages) Maxim Integrated Products – Multichannel, True-Differential, Serial, 14-Bit ADCs

Multichannel, True-Differential,
Serial, 14-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V (MAX1146/MAX1148), VDD = 3.3V (MAX1147/MAX1149), SHDN = VDD, VCOM = 0, fSCLK = 2.1MHz, external clock (50%
duty cycle), 18 clocks/conversion (116ksps), VREFADJ = VDD, CREF = 2.2µF, external +4.096V reference at REF (MAX1146/
MAX1148), external 2.500V reference at REF (MAX1147/MAX1149), TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
EXTERNAL REFERENCE AT REF
REF Input Voltage Range
VREF
1.5
VDD +
V
50mV
REF Input Current
IREF
Shutdown
125 450
µA
0.01
10
REF Input Resistance
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
6
8
kΩ
Input High Voltage
VIH
VDD < 3.6V
VDD > 3.6V
2.0
V
3.0
Input Low Voltage
Input Hysteresis
VIL
VHYST
0.8
V
0.2
V
Input Leakage
IIN
±1
µA
Input Capacitance
CIN
10
pF
DIGITAL OUTPUT (DOUT, SSTRB)
Output-Voltage Low
VOL
ISINK = 2mA
0.4
V
Output-Voltage High
Tri-State Leakage Current
Tri-State Output Capacitance
POWER REQUIREMENTS
VOH
IL
COUT
ISOURCE = 2mA
CS = VDD
CS = VDD
VDD - 0.5
V
±10
µA
10
pF
Positive Supply Voltage
MAX1147/MAX1149
VDD
MAX1146/MAX1148
2.7
3.6
V
4.75
5.25
Supply Current (Note 8)
116ksps
Normal
External
reference
10ksps
IDD
operation, full-
1ksps
scale input
Internal reference at
116ksps
1.1
1.5
0.12
mA
0.012
1.9
2.4
mA
Shutdown Supply Current
(Note 8)
Power-Supply Rejection (Note 9)
Fast power-down
Full power-down
SHDN = DGND
PSR External reference
120
0.3
µA
0.3
10
±0.2
mV
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