LTC1287_1 データシートの表示（PDF） - Linear Technology
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LTC1287_1 Datasheet PDF : 16 Pages
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LTC1287
AC CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 3)
LTC1287B/LTC1287C
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
thDO
Time Output Data Remains Valid After CLK↓
50
ns
tf
DOUT Fall Time
See Test Circuits
q
40 100
ns
tr
DOUT Rise Time
See Test Circuits
q
40 100
ns
tWHCLK
tWLCLK
CLK High Time
CLK Low Time
VCC = 3V (Note 6)
600
ns
VCC = 3V (Note 6)
800
ns
tsuCS
Setup Time, CS↓ Before CLK↑
VCC = 3V (Note 6)
100
ns
tWHCS
CS High Time Between Data Transfer Cycles
VCC = 3V (Note 6)
5.0
µs
tWLCS
CS Low Time During Data Transfer
VCC = 3V (Note 6)
14
CLK Cycles
CIN
Input Capacitance
Analog Inputs On Channel
Analog Inputs Off Channel
Digital Inputs
100
pF
5
pF
5
pF
DIGITAL A D DC ELECTRICAL CHARACTERISTICS The q denotes the specifications which
apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL PARAMETER
CONDITIONS
LTC1287B/LTC1287C
MIN TYP MAX
UNITS
VIH
High Level Input Voltage
VCC = 3.6V
q
2.1
V
VIL
Low Level Input Voltage
VCC = 3.0V
q
0.45
V
IIH
High Level Input Current
VIN = VCC
q
2.5
µA
IIL
Low Level Input Current
VIN = 0V
q
– 2.5
µA
VOH
High Level Output Voltage
VOL
Low Level Output Voltage
VCC = 3.0V, IO = 20µA
IO = 400µA
VCC = 3.0V, IO = 20µA
IO = 400µA
2.90
V
q
2.7 2.85
V
0.05
V
q
0.10 0.3
V
IOZ
High Z Output Leakage
VOUT = VCC, CS High
q
VOUT = 0V, CS High
q
3
µA
–3
µA
ISOURCE
ISINK
Output Source Current
Output Sink Current
VOUT = 0V
VOUT = VCC
–10
mA
9
mA
ICC
Positive Supply Current
CS High
q
1.5 5
mA
IREF
Reference Current
VREF = 2.5V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground (unless otherwise
noted).
Note 3: VCC = 3V, VREF = 2.5V, CLK = 500kHz unless otherwise specified.
Note 4: One LSB is equal to VREF divided by 4096. For example, when VREF
= 2.5V, 1LSB = 2.5V/4096 = 0.61mV.
Note 5: Integral nonlinearity error is defined as the deviation of a code
from a straight line passing through the actual endpoints of the transfer
curve. The deviation is measured from the center of the quantization band.
Note 6: Recommended operating conditions.
q
10 50
µA
Note 7: Two on-chip diodes are tied to each analog input which will
conduct for analog voltages one diode drop below GND or one diode drop
above VCC. Be careful during testing at low VCC levels, as high level analog
inputs can cause this input diode to conduct, especially at elevated
temperature, and cause errors for inputs near full scale. This spec allows
50mV forward bias of either diode. This means that as long as the analog
input does not exceed the supply voltage by more than 50mV, the output
code will be correct.
Note 8: Channel leakage current is measured after the channel selection.
Note 9: Increased leakage currents at elevated temperatures cause the
S/H to droop, therefore it is recommended that fCLK ≥ 30kHz at 85°C and
fCLK ≥ 3kHz at 25°C.
1287fa
3
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