LTC1657 Просмотр технического описания (PDF) - Linear Technology
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LTC1657 Datasheet PDF : 16 Pages
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LTC1657/LTC1657L
ELECTRICAL CHARACTERISTICS 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.
SYMBOL PARAMETER
CONDITIONS
Digital I/O
VIH
Digital Input High Voltage
VIL
Digital Input Low Voltage
ILEAK
Digital Input Leakage
CIN
Digital Input Capacitance
Switching Characteristics
VIN = GND to VCC
(Note 7)
tCS
tWR
tCWS
tCWH
tDWS
tDWH
tLDAC
tCLR
CS (MSB or LSB) Pulse Width
WR Pulse Width
CS to WR Setup
CS to WR Hold
Data Valid to WR Setup
Data Valid to WR Hold
LDAC Pulse Width
CLR Pulse Width
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.
LTC1657
MIN TYP MAX
LTC1657L
MIN TYP MAX UNITS
q 2.4
q
q
q
2.0
0.8
±10
10
V
0.6
V
±10
µA
10
pF
q 40
60
ns
q 40
60
ns
q0
0
ns
q0
0
ns
q 40
60
ns
q0
0
ns
q 40
60
ns
q 40
60
ns
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).
4
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