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MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Leakage Current
On-/off-leakage, VIN = 0 or VDD
±1
A
Input Capacitance
(Note 6)
18
pF
TEMPERATURE MEASUREMENTS
TA = -20°C to +85°C
±0.5
±1.0
TA = -40°C to +85°C
±0.75
±1.5
Grade A
MAX1253
MAX1254
TA = +25°C
±0.3
TA = -40°C to +85°C
±1.2
±2.5
Grade B
MAX1253
TA = +25°C
±0.7
TA = -40°C to +85°C
±1.2
±3.0
Internal Sensor Measurement Error
(Note 7)
Grade B
MAX1254
TA = +25°C
±0.7
°C
TA = -40°C to +85°C±2
Differential
TA = +25°C±1
TA = -40°C to +85°C±5
External Sensor Measurement
Error (Note 8)
Single ended
TA = +25°C±2
°C
Differentially configured inputs and internal
sensor
0.3
Temperature Measurement Noise
Single-ended configured, external sensor
0.1
°C
Temperature Resolution
0.125
°C/LSB
Low
4
External Sensor Bias Current
High
66
A
Differentially configured inputs and internal
sensor
0.3
Power-Supply Rejection
PSR
Single-ended configured, external sensor
0.1
°C/V
INTERNAL REFERENCE
MAX1253
2.456
2.500
2.544
REF Output Voltage
VREF
MAX1254
4.024
4.096
4.168
V
Grade A
±8
REF Temperature Coefficient
TCREF
Grade B
±30
ppm/°C
REF Output Resistance
7k
MAX1253
200
REF Output Noise
MAX1254
160
VRMS
MAX1253
-70
-50
REF Power-Supply Rejection Ratio
PSRR
MAX1254
-70
-50
dB
EXTERNAL REFERENCE
REF Input Voltage Range
VREF
1.0
VDD + 0.05
V
VREF = +2.5V; fSAMPLE = 94ksps
15
40
REF Input Current
IREF
In power-down
±1
A
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +3.6V (MAX1253), VDD = +4.5V to +5.5V (MAX1254), VREF = +2.5V (MAX1253), VREF = +4.096V (MAX1254), fSCLK
= 10MHz (50% duty cycle), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)