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参数资料
| 型号： | DAC5311IDCKTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 8-BIT DAC, PDSO6 |
| 封装： | GREEN, PLASTIC, SC-70, 6 PIN |
| 文件页数： | 26/42页 |
| 文件大小： | 2283K |
| 代理商： | DAC5311IDCKTG4 |
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LAYOUT
SBAS442 – AUGUST 2008 ................................................................................................................................................................................................ www.ti.com
A precision analog component requires careful layout,
The power applied to AVDD should be well-regulated
adequate bypassing, and clean, well-regulated power
and low-noise. Switching power supplies and dc/dc
supplies.
converters often have high-frequency glitches or
spikes riding on the output voltage. In addition, digital
The DACx311 offers single-supply operation; it is
components can create similar high-frequency spikes
often used in close proximity with digital logic,
as the internal logic switches state. This noise can
microcontrollers, microprocessors, and digital signal
easily couple into the DAC output voltage through
processors. The more digital logic present in the
various paths between the power connections and
design and the higher the switching speed, the more
analog output. This condition is particularly true for
difficult it is to achieve good performance from the
the DACx311, as the power supply is also the
converter.
reference voltage for the DAC.
Because of the single ground pin of the DACx311, all
As with the GND connection, AVDD should be
return currents, including digital and analog return
connected to a +5V power supply plane or trace that
currents, must flow through the GND pin. Ideally,
is separate from the connection for digital logic until
GND is connected directly to an analog ground plane.
they are connected at the power entry point. In
This plane should be separate from the ground
addition,
the
1
F to 10F and 0.1F bypass
connection for the digital components until they are
capacitors are strongly recommended. In some
connected at the power entry point of the system.
situations, additional bypassing may be required,
such as a 100
F electrolytic capacitor or even a Pi
filter made up of inductors and capacitors—all
designed to essentially low-pass filter the +5V supply,
removing the high-frequency noise.
32
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): DAC5311 DAC6311 DAC7311
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