Datasheet

MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Leakage Current On-/off-leakage, V
IN
= 0 or V
DD
±1 µA
Input Capacitance (Note 6) 18 pF
TEMPERATURE MEASUREMENTS
T
A
= -20°C to +85°C ±0.5 ±1.0
T
A
= -40°C to +85°C ±0.75 ±1.5
Grade A
MAX1253
MAX1254
T
A
= +25°C ±0.3
T
A
= -40°C to +85°C ±1.2 ±2.5
Grade B
MAX1253
T
A
= +25°C ±0.7
T
A
= -40°C to +85°C ±1.2 ±3.0
Internal Sensor Measurement Error
(Note 7)
Grade B
MAX1254
T
A
= +25°C ±0.7
°C
T
A
= -40°C to +85°C±2
Differential
T
A
= +25°C±1
T
A
= -40°C to +85°C±5
External Sensor Measurement
Error (Note 8)
Single ended
T
A
= +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
µA
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 V
REF
MAX1254 4.024 4.096 4.168
V
Grade A ±8
REF Temperature Coefficient TC
REF
Grade B ±30
p p m /°C
REF Output Resistance 7kΩ
MAX1253 200
REF Output Noise
MAX1254 160
µV
RMS
MAX1253 -70 -50
REF Power-Supply Rejection Ratio PSRR
MAX1254 -70 -50
dB
EXTERNAL REFERENCE
REF Input Voltage Range V
REF
1.0 V
DD
+ 0.05 V
V
REF
= +2.5V; f
SAMPLE
= 94ksps 15 40
REF Input Current I
REF
In power-down ±1
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX1253), V
DD
= +4.5V to +5.5V (MAX1254), V
REF
= +2.5V (MAX1253), V
REF
= +4.096V (MAX1254), f
SCLK
= 10MHz (50% duty cycle), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)