Datasheet

3
LTC1257
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Positive Supply Voltage For Specified Performance ● 4.75 15.75 V
I
CC
Supply Current 4.75V ≤ V
CC
≤ 5.25V ● 350 600 µA
4.75V ≤ V
CC
≤ 15.75V ● 800 1500 µA
Op Amp DC Performance
Short-Circuit Current Low V
OUT
Shorted to GND ● 60 mA
Short-Circuit Current High V
OUT
Shorted to V
CC
● 60 mA
Output Impedance to GND Input Code = 0 ● 250 500 Ω
AC Performance
Voltage Output Slew Rate 5kΩ in Parallel with 100pF ● 1.0 V/µs
Voltage Output Settling Time To ±1/2LSB, 5kΩ in Parallel with 100pF, V
CC
= 4.75V ● 6 µs
Digital Feedthrough (Notes 2,3) 50 nV/s
Digital I/O
V
IH
Digital Input High Voltage ● 2.4 V
V
IL
Digital Input Low Voltage ● 0.8 V
V
OH
Digital Output High Voltage I
OUT
= –1mA, D
OUT
Only ● V
CC
– 1 V
V
OL
Digital Output Low Voltage 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 2) ● 10 pF
Switching (Note 2)
t1 D
IN
Valid to CLK Setup ● 100 ns
t2 D
IN
Valid to CLK Hold ● 25 ns
t3 CLK High Time ● 350 ns
t4 CLK Low Time ● 350 ns
t5 LOAD Pulse Width ● 150 ns
t6 LSB CLK to LOAD ● 0ns
t7 LOAD High to CLK ● 0ns
t8 D
OUT
Output Delay C
LOAD
= 15pF ● 35 150 ns
f
CLK
Maximum Clock Frequency 1.4 MHz
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Guaranteed by design; not subject to test.
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at
T
A
= T
MIN
to T
MAX
. V
CC
= 4.75V to 15.75V, internal or external reference (2.475V ≤ V
REF
≤ V
CC
– 2.7V), unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 3: DAC switched from all 1s to all 0s, and all 0s to all 1s code.
Note 4: Guaranteed with internal V
REF
or with external V
REF
range of
2.475V to 12V. Tested at 10V.