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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
= 4.5V to 5.5V. (See Figure 1) (Note 13).
LTC2631-HM12/-HM10/-HM8/-HZ12/-HZ10/-HZ8, LTC2631A-HM12/-HZ12 (V
FS
= 4.096V)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SCL
SCL Clock Frequency
l
0 400 kHz
t
HD(STA)
Hold Time (Repeated) Start Condition
l
0.6 µs
t
LOW
Low Period of the SCL Clock Pin
l
1.3 µs
t
HIGH
High Period of the SCL Clock 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 of Both SDA and SCL Signals (Note 12)
l
20 + 0.1C
B
300 ns
t
f
Fall Time of Both SDA and SCL Signals (Note 12)
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
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltages are with respect to GND.
Note 3: High temperatures degrade operating lifetimes. Operating lifetime
is derated at temperatures greater than 105°C.
Note 4: Linearity and monotonicity are defined from code k
L
to code
2
N
– 1, where N is the resolution and k
L
is given by k
L
= 0.016 • (2
N
/ V
FS
),
rounded to the nearest whole code. For V
FS
= 2.5V and N = 12, k
L
= 26 and
linearity is defined from code 26 to code 4,095. For V
FS
= 4.096V and
N = 12, k
L
= 16 and linearity is defined from code 16 to code 4,095.
Note 5: Inferred from measurement at code 16 (LTC2631-12), code 4
(LTC2631-10) or code 1 (LTC2631-8), and at full-scale.
Note 6: This IC includes current limiting that is intended to protect the
device during momentary overload conditions. Junction temperature can
exceed the rated maximum during current limiting. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
Note 7: Digital inputs at 0V or V
CC
.
Note 8: Guaranteed by design and not production tested.
Note 9: Internal Reference mode. DAC is stepped 1/4 scale to 3/4 scale
and 3/4 scale to 1/4 scale. Load is 2kΩ in parallel with 100pF to GND.
Note 10: Temperature coefficient is calculated by dividing the maximum
change in output voltage by the specified temperature range.
Note 11: Maximum V
IH
= V
CC(MAX)
+ 0.5V
Note 12: C
B
= capacitance of one bus line in pF
Note 13: All values refer to V
IH
= V
IH(MIN)
and V
IL
= V
IL(MAX)
levels.
Note 14: Minimum V
IL
exceeds the Absolute Maximum rating. This
condition won’t damage the IC, but could degrade performance.
Note 15: Full-scale error is determined using the reference voltage
measured at the REF pin.
