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ADC12D040 Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. ADC12D040
Description  Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with Internal/External Reference and Sample-and-Hold
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC12D040 Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Applications Information (Continued)
about output timing, a simple way to capture a valid output is
to latch the data on the falling edge of the conversion clock
(pin 10).
Be very careful when driving a high capacitance bus. The
more capacitance the output drivers must charge for each
conversion, the more instantaneous digital current flows
through V
DR and DR GND. These large charging current
spikes can cause on-chip ground noise and couple into the
analog circuitry, degrading dynamic performance. Adequate
bypassing and careful attention to the ground plane will
reduce this problem. Additionally, bus capacitance beyond
the specified 20 pF/pin will cause t
OD to increase, making it
difficult to properly latch the ADC output data. The result
could be an apparent reduction in dynamic performance.
To minimize noise due to output switching, minimize the load
currents at the digital outputs. This can be done by connect-
ing buffers between the ADC outputs and any other circuitry
(74ACQ541, for example). Only one input should be con-
nected to each output pin. Additionally, inserting series re-
sistors of 47
Ω to 56Ω at the digital outputs, close to the ADC
pins, will isolate the outputs from trace and other circuit
capacitances and limit the output currents, which could oth-
erwise result in performance degradation. See Figure 4.
20046013
FIGURE 4. Application Circuit using Transformer or Differential OpAmp Drive Circuit
www.national.com
18


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