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ADC0851CIN Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza ADC0851CIN
Descripción Electrónicos  8-Bit Analog Data Acquisition and Monitoring Systems
Download  36 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0851CIN Datasheet(HTML) 5 Page - National Semiconductor (TI)

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AC Electrical Characteristics (Continued)
The following specifications apply for VCC ea5VDC VREF ea45 VDC AGND e DGND e 0V fCLK e 1 MHz tr e tf e
5 ns unless otherwise specified Boldface limits apply for TA e TJ e TMIN to TMAX all other limits apply at TA e TJ e 25 C
Symbol
Parameter
Conditions
Typical
Limit
Units
(Note 5)
(Note 6)
(Limits)
t1H t0H
Rising Edge of CS to
C e 100 pF R e 2k
Data Output Hi-Z
(See TRI-STATE
90
200
ns (Max)
Test Circuits)
fOSC
Oscillator Clock Freq
Rext e 316 kX
1
14
MHz (Max)
(Analog Timing)
Cext e 170 pF
06
MHz (Min)
tEOC
CS to End of
OSC Clock
Conversion Delay
Periods
1
Min
2
Max
tConv
Conversion Time
OSC Clock
Periods
17
(Min)
18
(Max)
tCS-INT
CS to Interrupt Delay
60
120
ns (Max)
CIN
Capacitance of
5pF
Logic Input
COUT
Capacitance of
5pF
Logic Output
Note 1
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is
functional but do not guarantee specific performance limits For guaranteed specifications and test conditions see the Electrical Characteristics The guaranteed
specifications apply only for the test conditions listed Some performance characteristics may degrade when the device is not operated under the listed test
conditions
Note 2
All voltages are measured with respect to ground (AGND e DGND e 0V)
Note 3
All of the analog and digital input pins are internally diode clamped to the supply pins Should the applied voltage at any pin exceed the power supply
voltage the additional absolute value of current at that pin (caused by the forward biasing of the internal diodes) should be limited to 5 mA or less
Note 4
Human body model 100 pF discharged through a 15 kX resistor
Note 5
Typical specifications are at a25 C and represent the most likely parametric norm
Note 6
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level)
Note 7
Total unadjusted error includes comparator offset ADC linearity and multiplexer error and is expressed in LSBs
Note 8
Two on-chip diodes are tied to each analog input The diodes will forward conduct for analog input voltages one diode drop below ground or one diode drop
above VCC Care should be exercised when operating the device at low supply voltages (eg VCC e 45V) because high analog inputs (5V) can cause the input
diodes to conduct especially at elevated temperatures This will cause errors for analog inputs near full scale The specification allows 50 mV forward bias of either
clamp diode Thus as long as VIN or VREF does not exceed the supply voltage by more than 50 mV the output code will be correct To achieve an absolute 0 VDC
to5VDC input voltage range will therefore require a minimum supply voltage of 4950 VDC
Note 9
Leakage current is measured with the oscillator clock disabled
Note 10
Measured supply current does not include the DAC ladder current
Note 11
A 40% to 60% clock duty cycle range ensures proper operation at all clock frequencies
5


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