Datasheet

3
LTC1257
V
CC
= 4.75V to 15.75V, internal or external reference
(2.475V ≤ V
REF
≤ V
CC
– 2.7V), I
OUT
≤ 2mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
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 ● 150 300 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 ● 6 µs
Digital Feedthrough (Notes 1,2) 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 1) ● 10 pF
Switching (Note 1)
t1 D
IN
Valid to CLK Setup ● 150 ns
t2 D
IN
Valid to CLK Hold ● 0ns
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 ● 150 ns
f
CLK
Maximum Clock Frequency 1.4 MHz
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Guaranteed by design; not subject to test.
Note 2: DAC switched from all 1s to all 0s, and all 0s to all 1s code.