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參數(shù)資料
| 型號： | DAC7741YL |
| 元件分類： | DAC |
| 英文描述： | 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
| 中文描述： | 16位具有內(nèi)部參考和并行接口單通道數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 421K |
| 代理商： | DAC7741YL |
DAC7741
SBAS248A
17
www.ti.com
LAYOUT
A precision analog component requires careful layout, adequate
bypassing, and clean, well-regulated power supplies. The
DAC7741 offers separate digital and analog supplies, as 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 switching speed,
the more important it will become to separate the analog and
digital ground and supply planes at the device.
Since the DAC7741 has both analog and digital ground pins,
return currents can be better controlled and have less effect
on the DAC output error. Ideally, AGND would be connected
directly to an analog ground plane and DGND to the digital
ground plane. The analog ground plane would be separate
from the ground connection for the digital components until
they were connected at the power entry point of the system.
The voltages applied to V
CC
and V
SS
should be well regulated
and low noise. Switching power supplies and dc/dc convert-
ers 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.
In addition, a 1
μ
F to 10
μ
F bypass capacitor in parallel with a
0.1
μ
F bypass capacitor is strongly recommended for each
supply input. In some situations, additional bypassing may
be required, such as a 100
μ
F electrolytic capacitor or even
a "Pi" filter made up of inductors and capacitors
–
all designed
to essentially low-pass filter the analog supplies, removing
any high frequency noise components.
NOISE PERFORMANCE
Increased noise performance of the DAC output can be
achieved by filtering the voltage reference input to the
DAC7741. Figure 10 shows a typical internal reference filter
schematic. A low-pass filter applied between the REF
OUT
and
REF
IN
pins can increase noise immunity at the DAC and
output amplifier. The REF
OUT
pin can source a maximum of
50
μ
A so care should be taken in order to avoid overloading
the internal reference output
.
N
V
S
V
C
1
2
3
43
44
45
46
47
48
(Other Connections
Omitted for Clarity)
RSTSEL
REFEN
REF
OUT
REFADJ
REF
IN
NC
100k
1
μ
F
FIGURE 10. Internal Reference Filter.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC7741YL/250 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7741YL/250G4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16B Sgl Channel DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7741YL/2K | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7741YL/2KG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16B Sgl Channel DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7742 | 制造商:BB 制造商全稱:BB 功能描述:16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
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