Datasheet

LTC2632
9
2632fa
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, V
OUT
unloaded unless otherwise specified.
LTC2632-HI12/-HI10/-HI8/-HZ12/-HZ10/-HZ8, LTC2632A-HI12/-HZ12 (V
FS
= 4.096V)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
1
SDI Valid to SCK Setup (Figure 1)
l
4 ns
t
2
SDI Valid to SCK Hold (Figure 1)
l
4 ns
t
3
SCK High Time (Figure 1)
l
9 ns
t
4
SCK Low Time (Figure 1)
l
9 ns
t
5
CS/LD Pulse Width (Figure 1)
l
10 ns
t
6
LSB SCK High to CS/LD High (Figure 1)
l
7 ns
t
7
CS/LD Low to SCK High (Figure 1)
l
7 ns
t
10
CS/LD High to SCK Positive Edge (Figure 1)
l
7 ns
SCK Frequency 50% Duty Cycle
l
50 MHz
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 (LTC2632-12), code 4
(LTC2632-10) or code 1 (LTC2632-8), 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:
CS/LD can be held at high voltage as V
CC
ramps upon power-up.