LTC2637
10
2637fb
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. Operating at temperatures
above 110°C and with V
CC
> 4V requires V
CC
slew rates to be no greater
than 110mV/ms.
Note 4: Linearity and monotonicity are defi ned 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 defi ned from code 26 to code 4,095. For V
FS
= 4.096V and N = 12, k
L
=
16 and linearity is defi ned from code 16 to code 4,095.
Note 5: Inferred from measurement at code 16 (LTC2637-12), code 4
(LTC2637-10) or code 1 (LTC2637-8), 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 specifi ed 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 2k in parallel with 100pF to GND.
Note 10: Temperature coeffi cient is calculated by dividing the maximum
change in output voltage by the specifi ed 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
IN(MIN)
and V
IL
= V
IL(MAX)
levels.
Note 14: Minimum V
IL
exceeds Absolute Maximum rating. This condition
won’t damage the IC, but could degrade performance.
Note 15: Thermal resistance of MSOP package limits I
OUT
to
–5mA ≤ I
OUT
≤ 5mA for H-grade MSOP parts and V
CC
= 5V ±10%.
LTC2637-HMI12/ LTC2637-HMI10/ LTC2637-HMI8/ LTC2637-HMX12/ LTC2637-HMX10/ LTC2637-HMX8/ LTC2637-HZ12/ LTC2637-HZ10/
LTC2637-HZ8 (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
TIMING CHARACTERISTICS
The l denotes specifi cations that apply over the full operating temperature range,
otherwise specifi cations are at T
A
= 25°C. V
CC
=4.5V to 5.5V. (See Figure 1) (Note 13).
