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ADC12040CIVY Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza ADC12040CIVY
Descripción Electrónicos  12-Bit, 40 MSPS, 340 mW A/D Converter with Internal Sample-and-Hold
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC12040CIVY Datasheet(HTML) 7 Page - National Semiconductor (TI)

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AC Electrical Characteristics
Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, V
A =VD = +5V, VDR =
+3.0V, PD = 0V, V
REF = +2.0V, fCLK = 40 MHz, tr =tf = 3 ns, CL = 20 pF/pin. Boldface limits apply for TA =TJ =TMIN to
T
MAX: all other limits TA =TJ = 25˚C (Notes 7, 8, 9, 12)
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 10)
Units
(Limits)
f
CLK1
Maximum Clock Frequency
50
40
MHz (min)
f
CLK2
Minimum Clock Frequency
100
kHz
t
CH
Clock High Time
11.25
ns (min)
t
CL
Clock Low Time
11.25
ns (min)
t
CONV
Conversion Latency
6
Clock
Cycles
t
OD
Data Output Delay after Rising
CLK Edge
V
DR = 2.5V
12
16.3
15.9
ns (max)
ns (min)
V
DR = 3.0V
11
15.7
14.9
ns (max)
ns (min)
t
AD
Aperture Delay
1.2
ns
t
AJ
Aperture Jitter
1.2
ps rms
t
DIS
Data outputs into TRI-STATE
Mode
4ns
t
EN
Data Outputs Active after
TRI-STATE
4ns
t
PD
Power Down Mode Exit Cycle
20
t
CLK
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 GND = AGND = DGND = 0V, unless otherwise specified.
Note 3: When the input voltage at any pin exceeds the power supplies (that is, VIN < AGND, or VIN > VA), the current at that pin should be limited to 25 mA. The
50 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 25 mA to two.
Note 4: The absolute maximum junction temperature (TJmax) for this device is 150˚C. The maximum allowable power dissipation is dictated by TJmax, the
junction-to-ambient thermal resistance (
θJA), and the ambient temperature, (TA), and can be calculated using the formula PDMAX=(TJmax - TA )/θJA. In the 32-pin
LQFP,
θJA is 79˚C/W, so PDMAX = 1,582 mW at 25˚C and 823 mW at the maximum operating ambient temperature of 85˚C. Note that the power consumption of
this device under normal operation will typically be about 360 mW (340 typical power consumption + 20 mW TTL output loading). The values for maximum power
dissipation listed above will be reached only when the device is operated in a severe fault condition (e.g. when input or output pins are driven beyond the power
supply voltages, or the power supply polarity is reversed). Obviously, such conditions should always be avoided.
Note 5: Human body model is 100 pF capacitor discharged through a 1.5 k
Ω resistor. Machine model is 220 pF discharged through 0Ω.
Note 6: The 235˚C reflow temperature refers to infrared reflow. For Vapor Phase Reflow (VPR), the following Conditions apply: Maintain the temperature at the top
of the package body above 183˚C for a minimum 60 seconds. The temperature measured on the package body must not exceed 220˚C. Only one excursion above
183˚C is allowed per reflow cycle.
Note 7: The inputs are protected as shown below. Input voltage magnitudes above VA or below GND will not damage this device, provided current is limited per
(Note 3). However, errors in the A/D conversion can occur if the input goes above VA or below GND by more than 100 mV. As an example, if VA is 4.75V, the full-scale
input voltage must be
≤4.85V to ensure accurate conversions.
20014807
Note 8: To guarantee accuracy, it is required that |VA–VD| ≤ 100 mV and separate bypass capacitors are used at each power supply pin.
Note 9: With the test condition for VREF = +2.0V (4VP-P differential input), the 12-bit LSB is 977 µV.
www.national.com
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