LTC1657/LTC1657L
5
1657lfa
For more information www.linear.com/LTC1657
SYMBOL PARAMETER CONDITIONS
LTC1657 LTC1657L
UNITSMIN TYP MAX MIN TYP MAX
Digital I/O
V
IH
Digital Input High Voltage
l
2.4 2.0 V
V
IL
Digital Input Low Voltage
l
0.8 0.6 V
I
LEAK
Digital Input Leakage V
IN
= GND to V
CC
l
±10 ±10 µA
C
IN
Digital Input Capacitance (Note 7)
l
10 10 pF
Switching Characteristics
t
CS
CS (MSB or LSB) Pulse Width
l
40 60 ns
t
WR
WR Pulse Width
l
40 60 ns
t
CWS
CS to WR Setup
l
0 0 ns
t
CWH
CS to WR Hold
l
0 0 ns
t
DWS
Data Valid to WR Setup
l
40 60 ns
t
DWH
Data Valid to WR Hold
l
0 0 ns
t
LDAC
LDAC Pulse Width
l
40 60 ns
t
CLR
CLR Pulse Width
l
40 60 ns
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range T
A
= T
MIN
to T
MAX
, V
CC
= 5V (LTC1657), V
CC
= 3V (LTC1657L), unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
External reference REFHI = 2.2V. V
CC
= 5V (LTC1657).
External reference REFHI = 1.3V. V
CC
= 3V (LTC1657L).
Note 3: Nonlinearity is defined from code 128 to code 65535 (full scale).
See Applications Information.
Note 4: Digital inputs at 0V or V
CC
.
Note 5: DAC switched between all 1s and all 0s. V
FS
= 4.096V.
Note 6: D0 to D15 toggle between all 0s and all 1s with REFHI = 0V,
CSMSB = CSLSB = WR = LDAC = High
Note 7: Guaranteed by design. Not subject
to test.
Note 8: DAC inputs all 1s.
Note 9: X1/X2 tied to GND, the voltage noise will be a factor of 2 greater.
Note 10: Using 2.048V (1.25V) external reference with 3nV/√Hz noise at
1kHz for LTC1657/(LTC1657L).
