Datasheet

3
LTC1458/LTC1458L
ELECTRICAL CHARACTERISTICS
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
= 4.5V to 5.5V (LTC1458), 2.7V to 5.5V (LTC1458L),
X1/X2 = REFLO = GND, REFHI = REFOUT, V
OUT
unloaded, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Input Capacitance 15 pF
Short-Circuit Current REFOUT Shorted to GND ● 45 120 mA
Power Supply
V
CC
Positive Supply Voltage For Specified Performance, LTC1458 ● 4.5 5.5 V
LTC1458L ● 2.7 5.5 V
I
CC
Supply Current 4.5V ≤ V
CC
≤ 5.5V (Note 5) , LTC1458 ● 1100 2400 µA
2.7V ≤ V
CC
≤ 5.5V (Note 5), LTC1458L ● 800 2000 µA
Op Amp DC Performance
Short-Circuit Current Low V
OUT
Shorted to GND ● 60 120 mA
Short-Circuit Current High V
OUT
Shorted to V
CC
● 70 120 mA
Output Impedance to GND Input Code = 0 ● 40 160 Ω
AC Performance
Voltage Output Slew Rate (Note 3) ● 0.5 1.0 V/µs
Voltage Output Settling Time (Notes 3, 4) to ±0.5LSB 14 µs
Digital Feedthrough 0.3 nV• s
AC Feedthrough REFHI = 1kHz, 2V
P-P
, (Code: All 0s) –95 dB
SINAD Signal-to-Noise + Distortion REFHI = 1kHz, 2V
P-P
, (Code: All 1s) 85 dB
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
= 5V (LTC1458), 3V (LTC1458L), unless otherwise noted.
LTC1458 LTC1458L
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Digital I/O
V
IH
Digital Input High Voltage ● 2.4 2.0 V
V
IL
Digital Input Low Voltage ● 0.8 0.6 V
V
OH
Digital Output High Voltage I
OUT
= –1mA ● V
CC
– 1.0 V
CC
– 0.7 V
V
OL
Digital Output Low Voltage I
OUT
= 1mA ● 0.4 0.4 V
I
LEAK
Digital Input Leakage V
IN
= GND to V
CC
● ±10 ±10 µA
C
IN
Digital Input Capacitance Guaranteed by Design, ● 10 10 pF
Not Subject to Test
Switching
t
1
D
IN
Valid to CLK Setup ● 40 60 ns
t
2
D
IN
Valid to CLK Hold ● 00ns
t
3
CLK High Time ● 40 60 ns
t
4
CLK Low Time ● 40 60 ns
t
5
CS/LD Pulse Width ● 50 80 ns
t
6
LSB CLK to CS/LD ● 40 60 ns
t
7
CS/LD Low to CLK ● 20 30 ns
t
8
D
OUT
Output Delay C
LOAD
= 15pF ● 150 220 ns
t
9
CLK Low to CS/LD Low ● 20 30 ns