Datasheet

3
LTC1654
1654fb
The ● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, V
CC
= 2.7V to 5.5V, V
OUT A
, V
OUT B
unloaded, REFHI A,
REFHI B = 4.096V (V
CC
= 5V), REFHI A, REFHI B = 2.048V (V
CC
= 2.7V), REFLO = 0V, X
1
/X
1/2
= 0V.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
AC Performance
Voltage Output Slew Rate (Note 8) SLOW ● 0.20 0.9 V/µs
(Note 8) FAST
● 1.25 3.8 V/µs
Voltage Output Settling Time (Note 4) to ±1LSB, SLOW 8.5 µs
(Note 4) to ±1LSB, FAST 3.0 µs
Digital Feedthrough (Note 7) 1 nV•s
Midscale Glitch Impulse DAC Switch Between 8000 and 7FFF 20 nV•s
Output Noise Voltage Density at 10kHz, SLOW 170 nV/√Hz
at 10kHz, FAST 150 nV/√Hz
Digital I/O
V
IH
Digital Input High Voltage V
CC
= 5V ● 2.4 V
V
IL
Digital Input Low Voltage V
CC
= 5V ● 0.8 V
V
OH
Digital Output High Voltage V
CC
= 5V, I
OUT
= –1mA, D
OUT
Only ● V
CC
– 0.4 V
V
OL
Digital Output Low Voltage V
CC
= 5V, I
OUT
= 1mA, D
OUT
Only ● 0.4 V
V
IH
Digital Input High Voltage V
CC
= 3V ● 2.4 V
V
IL
Digital Input Low Voltage V
CC
= 3V ● 0.8 V
V
OH
Digital Output High Voltage V
CC
= 3V, I
OUT
= –1mA, D
OUT
Only ● V
CC
– 0.4 V
V
OL
Digital Output Low Voltage V
CC
= 3V, I
OUT
= 1mA, D
OUT
Only ● 0.4 V
I
LEAK
Digital Input Leakage V
IN
= GND to V
CC
● ±10 µA
C
IN
Digital Input Capacitance (Note 6) 10 pF
Reference Input
Reference Input Resistance REFHI to REFLO ● 30 60 kΩ
Reference Input Range (Note 6) ● 0V
CC
V
Reference Input Current In Shutdown ● 1 µA
Switching Characteristics (V
CC
= 4.5V to 5.5V)
t
1
SDI Valid to SCK Setup ● 30 ns
t
2
SDI Valid to SCK Hold (Note 6) ● 0ns
t
3
SCK High Time (Note 6) ● 15 ns
t
4
SCK Low Time (Note 6) ● 15 ns
t
5
CS/LD Pulse Width (Note 6) ● 15 ns
t
6
LSB SCK to CS/LD (Note 6) ● 10 ns
t
7
CS/LD Low to SCK (Note 6) ● 10 ns
t
8
SD0 Output Delay C
LOAD
= 100pF ● 5 100 ns
t
9
SCK Low to CS/LD Low (Note 6) ● 10 ns
t
10
CLR Pulse Width (Note 6) ● 30 ns
Switching Characteristics (V
CC
= 2.7V to 5.5V)
t
1
SDI Valid to SCK Setup ● 45 ns
t
2
SDI Valid to SCK Hold (Note 6) ● 0ns
t
3
SCK High Time (Note 6) ● 20 ns
t
4
SCK Low Time (Note 6) ● 20 ns
t
5
CS/LD Pulse Width (Note 6) ● 20 ns
t
6
LSB SCK to CS/LD (Note 6) ● 15 ns
t
7
CS/LD Low to SCK (Note 6) ● 15 ns