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ADC0833BCN датащи(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали ADC0833BCN
подробное описание детали  8-Bit Serial I/O A/D Converter with 4-Channel Multiplexer
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0833BCN датащи(HTML) 5 Page - National Semiconductor (TI)

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AC Electrical Characteristics The following specifications apply for VCC e Va e 5V and tr e tf e 20 ns
unless otherwise specified These limits apply for TA e Tj e 25 C
Typ
Tested
Design
Parameter
Conditions
(Note 6)
Limit
Limit
Units
(Note 7)
(Note 8)
fCLK Clock Frequency
Min
10
kHz
Max
400
kHz
TC Conversion Time
Not including MUX Addressing Time
8
1fCLK
Clock Duty Cycle (Note 12)
Min
40
%
Max
60
%
tSET-UP CS Falling Edge or
250
ns
Data Input Valid to CLK
Rising Edge
tHOLD Data Input Valid
90
ns
after CLK Rising Edge
tpd1 tpd0 CLK Falling
CL e 100 pF
Edge to Output Data Valid
Data MSB First
650
1500
ns
(Note 13)
Data LSB First
250
600
ns
t1H tOH Rising Edge of CS
CL e 10 pF RL e 10k
125
250
ns
to Data Output and SARS
CL e 100 pF RL e 2k
500
ns
Hi-Z
(see TRI-STATE Test Circuits)
CIN Capacitance of Logic
5
pF
Input
COUT Capacitance of Logic
5
pF
Outputs
Note 1
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating
the device beyond its specified operating conditions
Note 2
All voltages are measured with respect to the ground pins
Note 3
Internal zener diodes (approx 7V) are connected from Va to GND and VCC to GND The zener at Va can operate as a shunt regulator and is connected to
VCC via a conventional diode Since the zener voltage equals the AD’s breakdown voltage the diode insures that VCC will be below breakdown when the device is
powered from Va Functionality is therefore guaranteed for Va operation even though the resultant voltage at VCC may exceed the specified Absolute Max of
65V It is recommended that a resistor be used to limit the max current into Va
Note 4
When the input voltage (VIN) at any pin exceeds the power supply rails (VIN k Vb or VIN l Va) the absolute value of current at that pin should be limited
to 5 mA or less The 20 mA package input current limits the number of pins that can exceed the power supply boundaries witha5mA current limit to four
Note 5
Human body model 100 pF discharged through a 15 kX resistor
Note 6
Typicals are at 25 C and represent most likely parametric norm
Note 7
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level)
Note 8
Design limits are guaranteed but not 100% tested These limits are not used to calculate outgoing quality levels
Note 9
See Applications section 30
Note 10
For VIN(b)tVIN(a) the digital output code will be 0000 0000 Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward
conduct for analog input voltages one diode drop below ground or one diode drop greater than the VCC supply Be careful during testing at low VCC levels (45V)
as high level analog inputs (5V) can cause this input diode to conductespecially at elevated temperatures and cause errors for analog inputs near full-scale The
spec allows 50 mV forward bias of either diode This means that as long as the analog 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 over
temperature variations initial tolerance and loading
Note 11
Leakage current is measured with the clock not switching
Note 12
A 40% to 60% clock duty cycle range insures proper operation at all clock frequencies In the case that an available clock has a duty cycle outside of
these limits the minimum time the clock is high or the minimum time the clock is low must be at least 1ms The maximum time the clock can be high is 60 ms The
clocked can be stopped when low so long as the analog input voltage remains stable
Note 13
Since data MSB first is the output of the comparator used in the successive approximation loop an additional delay is built in (see Block Diagram) to
allow for comparator response time
5


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