Datasheet
mA
MAX191
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V ±5%, V
SS
= 0V or -5V ±5%, f
CLK
= 1.6MHz, 50% duty cycle, AIN- = AGND, BIP = 0V, slow-memory mode, internal-reference
mode, reference compensation mode—external, synchronous operation, Figure 6, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PD External Leakage for Float
State (Note 12)
V
FLT
V2.8Reference compensation mode—external
PD Floating-State Voltage
nA±100Maximum current allowed for “floating state”
I
IN
µA±20
PD = 0V to V
DD
(Note 11)
PD Input Current
±200
PD = high/float
I
IN
µA
±0.1
PD = low
Input Current CLK
C
IN
pF10Input Capacitance (Note 6)
V
IL
V0.5
PD Input Low Voltage
V
IH
V4.5
PD Input High Voltage
I
IN
µA±10
V
IN
= 0V to V
DD
Input Current
V
IH
V2.4
CS, RD, CLK, HBEN, PAR, BIP
Input High Voltage
V
IL
V0.8
CS, RD, CLK, HBEN, PAR, BIP
Input Low Voltage
kΩ5 10External-reference modeInput Resistance
mA1External-reference = 5VInput Current
REFADJ Input Adjustment Range
(Note 10)
V2.5 5.0External-reference modeInput Voltage Range
µA60REFADJ = 5VREFADJ Input Current
V2.4REFADJ Output Voltage
V4.5REFADJ Disable Threshold
mV-60 30
µV±300
V
DD
= ±5%, V
SS
= ±5%
Power-Supply Rejection
µF4.7Reference compensation mode—externalCapacitive Load Required
mA18Output Short-Circuit Current
mV4
T
A
= +25°C, I
OUT
= 0mA to 2mA
Load Regulation
SYMBOL UNITSMIN TYP MAXCONDITIONSPARAMETER
Input Voltage Range (Note 7) V
V
SS
V
DD
Input Capacitance (Note 6) pF45 80
Input Leakage Current µA±10
V
IN
= V
SS
to V
DD
50MAX191_C
VREF Output Voltage V4.076 4.096 4.116
T
A
= +25°C
Small-Signal Bandwidth MHz2
60MAX191_E
Output Current Capability (Note 9) mA2
T
A
= +25°C
VREF Output Tempco (Note 8) ppm/°C
80MAX191_M
ANALOG INPUT
INTERNAL REFERENCE
REFERENCE INPUT
LOGIC INPUTS