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參數(shù)資料
| 型號(hào)： | DAC8501E250 |
| 英文描述： | Low-Power, Rail-to-Rail Output, 16-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 低功耗，軌至軌輸出，16位串行輸入數(shù)字至模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 15/18頁(yè) |
| 文件大小： | 321K |
| 代理商： | DAC8501E250 |
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DAC8501
SBAS212A
15
www.ti.com
The output voltage for any input code can be calculated as
follows:
V
V
D
R
R
R
V
R
R
O
REF
REF
=
+
65536
1
2
1
2
1
–
where D represents the input code in decimal (0 to 65535).
With V
REF
= 5V, R
1
= R
2
= 10k
:
V
D
V
O
=
10
65536
5
–
This is an output voltage range of
±
5V with 0000
H
corre-
sponding to a
–
5V output and FFFF
H
corresponding to a +5V
output. Similarly, using V
REF
= 2.5V, a
±
2.5V output voltage
range can be achieved.
LAYOUT
A precision analog component requires careful layout, ad-
equate bypassing, and clean, well-regulated power supplies.
As the DAC8501 offers single-supply operation, it will often
be used in close proximity with digital logic, microcontrollers,
microprocessors, and digital signal processors. The more
digital logic present in the design and the higher the switch-
ing speed, the more difficult it will be to keep digital noise
from appearing at the output.
Due to the single ground pin of the DAC8501, all return
currents, including digital and analog return currents, must
flow through the GND pin, which would, ideally, be con-
nected directly to an analog ground plane. This plane would
be separate from the ground connection for the digital com-
ponents until they were connected at the power-entry point of
the system.
The power applied to V
DD
should be well regulated and low
noise. Switching power supplies and DC/DC converters will
often have high-frequency glitches or spikes riding on the
output voltage. In addition, digital components can create
similar high-frequency spikes as their internal logic switches
states. This noise can easily couple into the DAC output
voltage through various paths between the power connec-
tions and analog output.
As with the GND connection, V
DD
should be connected to a
power-supply plane or trace that is separate from the con-
nection for digital logic until they are connected at the power-
entry point. In addition, the 1
μ
F to 10
μ
F and 0.1
μ
F bypass
capacitors are strongly recommended. In some situations,
additional bypassing may be required, such as a 100
μ
F
electrolytic capacitor or even a Pifilter made up of inductors
and capacitors
—
all designed to essentially low-pass filter the
+5V supply, removing the high-frequency noise.
(3)
(4)
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| DAC8501E2K5 | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, Rail-to-Rail Output, 16-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER |
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