12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
_______________________________________________________________________________________   3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 4.75V to 5.25V (MAX1298), V
DD
= +2.7V to 3.6V (MAX1299), external reference, V
REF
= +2.5V (MAX1298), V
REF
= +1.2V
(MAX1299), f
SCLK
= 2.5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25癈.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS
Input Voltage Low
V
IL
0.8
V
Input Voltage High
V
IH
V
D D
 - 0.8
V
Input Hysteresis
V
HYST
0.2
V
Input Leakage Current
I
IN
1
Input Capacitance
16
pF
DIGITAL OUTPUTS
V
Output Low Voltage
V
OL
I
SINK
 = 5mA
0.6
V
Output High Voltage
V
OH
I
SOURCE
 = 0.5mA
V
D D
 - 0.6
V
Three-State Output Leakage
Current
I
OUT
?0
Three-State Output
Capacitance
15
pF
POWER REQUIREMENTS
MAX1298
4.75
5.25
Positive Supply Voltage
V
DD
MAX1299
2.7
3.6
V
MAX1298
390
Ful l
- on, vol tag e m easur em ents,
i nter nal r efer ence
MAX1299
350
MAX1298
310
Ful l
- on, vol tag e m easur em ents,
exter nal r efer ence
MAX1299
280
MAX1298
440
500
Full-on, temperature measure-
ments, internal reference
MAX1299
400
500
MAX1298
360
Full-on, temperature measure-
ments, exter nal r efer ence
MAX1299
330
Standby, SCLK = GND
120
Standby-plus, SCLK = GND
190
Positive Supply Current (Note 6)
I
DD
Shutdown, SCLK = GND
2
10
Power-Supply Rejection Ratio
PSRR
(Note 7)
50
65
dB
INTERNAL VOLTAGE REFERENCE CHARACTERISTICS
V
DD
 = 5V
MAX1298
2.494
2.50
2.506
Reference Voltage
V
REF
V
DD
 = 3V
MAX1299
1.197
1.20
1.203
V
Reference Tempco
TC V
REF
?0
ppm/癈
Output Short-Circuit Current
1.25
mA
Capacitive Bypass at REF
0.1
MAX1298
130
REF Output Noise
f
N
 = 10Hz to 10kHz
MAX1299
65
RMS
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