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ADC0852CCN Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza ADC0852CCN
Descripción Electrónicos  Multiplexed Comparator with 8-Bit Reference Divider
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0852CCN Datasheet(HTML) 4 Page - National Semiconductor (TI)

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AC Characteristics tr e tf e 20 ns TA e 25 C
Typ
Tested
Design
Symbol
Parameter
Conditions
(Note 4)
Limit
Limit
Units
(Note 5)
(Note 6)
fCLK
Clock Frequency
MIN
10
kHz
(Note 12)
MAX
400
kHz
tD1
Rising Edge of Clock
CL e 100 pF
650
1000
ns
to ‘‘DO’’ Enabled
tr
Comparator Response
Not Including
2 a 1 ms
1fCLK
Time (Note 13)
Addressing Time
Clock Duty Cycle
MIN
40
%
(Note 10)
MAX
60
%
tSET-UP
CS Falling Edge or
MAX
250
ns
Data Input Valid to
CLK Rising Edge
tHOLD
Data Input Valid after
MIN
90
ns
CLK Rising Edge
tpd1 tpd0
CLK Falling Edge to
MAX
CL e 100 pF
650
1000
ns
Output Data Valid
(Note 11)
t1H t0H
Rising Edge of CS to
MAX
CL e 10 pF RL e 10k
125
250
ns
Data Output Hi-Z
CL e 100 pF RL e 2k
500
500
ns
(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 ground
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 ensures 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
Typicals are at 25 C and represent most likely parametric norm
Note 5
Tested and guaranteed to National AOQL (Average Outgoing Quality Level)
Note 6
Guaranteed but not 100% production tested These limits are not used to calculate outgoing quality levels
Note 7
Total unadjusted error includes comparator offset DAC linearity and multiplexer error It is expressed in LSBs of the threshold DAC’s input code
Note 8
For VIN(b)tVIN(a) the output will be 0 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 9
Leakage current is measured with the clock not switching
Note 10
A 40% to 60% clock duty cycle range ensures proper operation at all clock frequencies In the case that an available clock has a duty cycle outside of
these limits then 16 mS s CLK Low s 60 mS and 16 mS s CLK HIGH s %
Note 11
With CS low and programming complete D0 is updated on each falling CLK edge However each new output is based on the comparison completed 05
clock cycles prior (see
Figure 5 )
Note 12
Error specs are not guaranteed at 400 kHz (see graph Comparator Error vs fCLK)
Note 13
See text section 12
Note 14
Human body model 100 pF discharged through a 15 kX resistor
Note 15
Because the reference ladder of the ADC0852 is internally connected to VCC ladder resistance cannot be directly tested for the ADC0852 Ladder
current is included in the ADC0852’s supply current specification
4


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