Datasheet

3
LTC1448
V
CC
= 2.7V to 5.5V, V
OUT A
and V
OUT B
unloaded, REF ≤ V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 4: Digital inputs at 0V or V
CC
.
Note 5: V
OUT
can only swing from (GND + V
OS
) to (V
CC
– V
OS
) when
output is unloaded.
Note 6. Guaranteed by design, not subject to test.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
AC Performance
Voltage Output Slew Rate ● 0.5 1.0 V/µs
Voltage Output Settling Time (Notes 2, 3) to ±0.5LSB 14 µs
Digital Feedthrough 0.3 nV• s
Reference Input
R
IN
REF Input Resistance ● 7.5 12.5 18 kΩ
REF REF Input Range (Notes 5, 6) ● 0V
CC
V
Digital I/O
V
IH
Digital Input High Voltage V
CC
= 5V ● 2.4 V
V
CC
= 3V ● 2.0 V
V
IL
Digital Input Low Voltage V
CC
= 5V ● 0.8 V
V
CC
= 3V ● 0.6 V
I
LEAK
Digital Input Leakage V
IN
= GND to V
CC
● ±10 µA
C
IN
Digital Input Capacitance (Note 6) ● 10 pF
Switching (V
CC
= 4.5V to 5.5V)
t
1
D
IN
Valid to CLK Setup ● 40 ns
t
2
D
IN
Valid to CLK Hold ● 0ns
t
3
CLK High Time (Note 6) ● 40 ns
t
4
CLK Low Time (Note 6) ● 40 ns
t
5
CS/LD Pulse Width (Note 6) ● 50 ns
t
6
LSB CLK to CS/LD (Note 6) ● 40 ns
t
7
CS/LD Low to CLK (Note 6) ● 20 ns
t
8
CLK Low to CS/LD Low (Note 6) ● 20 ns
Switching (V
CC
= 2.7V to 5.5V)
t
1
D
IN
Valid to CLK Setup ● 60 ns
t
2
D
IN
Valid to CLK Hold ● 0ns
t
3
CLK High Time (Note 6) ● 60 ns
t
4
CLK Low Time (Note 6) ● 60 ns
t
5
CS/LD Pulse Width (Note 6) ● 80 ns
t
6
LSB CLK to CS/LD (Note 6) ● 60 ns
t
7
CS/LD Low to CLK (Note 6) ● 30 ns
t
8
CLK Low to CS/LD Low (Note 6) ● 30 ns
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Nonlinearity is defined from code 20 to code 4095 (full scale).
See Applications Information.
Note 2: Load is 5k in parallel with 100pF.
Note 3: DAC switched between all 1s and the code corresponding to V
OS
for the part.