Datasheet

LTC2451
3
2451fg
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V. (Notes 2, 7)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
CONV
Conversion Time 30Hz Mode
l
26 33.2 46 ms
t
CONV
Conversion Time 60Hz Mode
l
13 16.6 23 ms
f
SCL
SCL Clock Frequency
l
0 400 kHz
t
HD(SDA)
Hold Time (Repeated) START Condition
l
0.6 µs
t
LOW
LOW Period of the SCL Pin
l
1.3 µs
t
HIGH
HIGH Period of the SCL Pin
l
0.6 µs
t
SU(STA)
Set-Up Time for a Repeated START Condition
l
0.6 µs
t
HD(DAT)
Data Hold Time
l
0 0.9 µs
t
SU(DAT)
Data Set-Up Time
l
100 ns
t
r
Rise Time for SDA/SCL Signals (Note 6)
l
20 + 0.1C
B
300 ns
t
f
Fall Time for SDA/SCL Signals (Note 6)
l
20 + 0.1C
B
300 ns
t
SU(STO)
Set-Up Time for STOP Condition
l
0.6 µs
t
BUF
Bus Free Time Between a STOP and START
Condition
l
1.3 µs
I
2
C TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V. (Note 2)
ANALOG INPUT AND REFERENCES
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage
l
2.7 5.5 V
I
CC
Supply Current
Conversion
Sleep
l
l
400
0.2
700
0.5
µA
µA
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage
l
0.7V
CC
V
V
IL
Low Level Input Voltage
l
0.3V
CC
V
V
HYS
Hysteresis of Schmidt Trigger Inputs (Note 3)
l
0.05V
CC
V
V
OL
Low Level Output Voltage (SDA) I = 3mA
l
0.4 V
I
IN
Input Leakage 0.1V
CC
≤ V
IN
≤ 0.9V
CC
l
–1 1 µA
C
I
Capacitance for Each I/O Pin
l
10 pF
C
B
Capacitance Load for Each Bus Line
l
400 pF
I
2
C INPUTS AND OUTPUTS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
l
V
REF
–
V
REF
+
V
V
REF
+
Positive Reference Voltage Range V
REF
+
– V
REF
–
≥ 2.5V
l
V
CC
– 2.5 V
CC
V
V
REF
–
Negative Reference Voltage Range V
REF
+
– V
REF
–
≥ 2.5V
l
0 V
CC
– 2.5 V
C
IN
IN Sampling Capacitance 0.35 pF
I
DC_LEAK(VIN)
IN DC Leakage Current V
IN
= GND (Note 8)
V
IN
= V
CC
(Note 8)
l
l
–10
–10
1
1
10
10
nA
nA
I
DC_LEAK(REF
+
, REF
–
)
REF
+
, REF
–
DC Leakage Current V
REF
= 5V (Note 8)
l
–10 1 10 nA
I
CONV
Input Sampling Current (Note 5) 50 nA