4
LTC1657/LTC1657L
The q denotes specifications which apply over the full operating
temperature range TA = TMIN to TMAX. VCC = 5V (LTC1657), VCC = 3V (LTC1657L), unless otherwise noted.
ELECTRICAL CHARACTERISTICS
LTC1657
LTC1657L
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Digital I/O
VIH
Digital Input High Voltage
q
2.4
2.0
V
VIL
Digital Input Low Voltage
q
0.8
0.6
V
ILEAK
Digital Input Leakage
VIN = GND to VCC
q
±10
A
CIN
Digital Input Capacitance
(Note 7)
q
10
pF
Switching Characteristics
tCS
CS (MSB or LSB) Pulse Width
q
40
60
ns
tWR
WR Pulse Width
q
40
60
ns
tCWS
CS to WR Setup
q
00
ns
tCWH
CS to WR Hold
q
00
ns
tDWS
Data Valid to WR Setup
q
40
60
ns
tDWH
Data Valid to WR Hold
q
00
ns
tLDAC
LDAC Pulse Width
q
40
60
ns
tCLR
CLR Pulse Width
q
40
60
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: External reference REFHI = 2.2V. VCC = 5V (LTC1657).
External reference REFHI = 1.3V. VCC = 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 VCC.
Note 5: DAC switched between all 1s and all 0s. VFS = 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).