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参数资料
| 型号： | DAC7512N/250 |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 12-BIT DAC, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 7/16页 |
| 文件大小： | 393K |
| 代理商： | DAC7512N/250 |
15
DAC7512
SBAS156
135
A. This is with no load on the output of the DAC. When
the DAC output is loaded, the REF02 also needs to supply
the current to the load. The total current required (with a
5k
load on the DAC output) is:
135
A + (5V/5kW) = 1.14mA
The load regulation of the REF02 is typically 0.005%/mA,
which results in an error of 285
V for the 1.14mA current
drawn from it. This corresponds to a 0.2LSB error.
BIPOLAR OPERATION USING THE DAC7512
The DAC7512 has been designed for single-supply opera-
tion but a bipolar output range is also possible using the
circuit in Figure 10. The circuit shown will give an output
voltage range of
±5V. Rail-to-rail operation at the amplifier
output is achievable using an OPA251 as the output ampli-
fier.
The output voltage for any input code can be calculated as
follows:
V
D
R
V
R
O
DD
=
+
4096
1
2
1
2
1
–
where D represents the input code in decimal (0 - 4095).
With VDD = 5V, R1 = R2 = 10kW:
V
D
V
O =
10
4096
5
–
This is an output voltage range of
±5V with 000
H corre-
sponding to a –5V output and FFFH corresponding to a +5V
output.
LAYOUT
A precision analog component requires careful layout, ad-
equate bypassing, and clean, well-regulated power supplies.
As the DAC7512 offers single-supply operation, it will
often be used in close proximity with digital logic,
microcontrollers, microprocessors, and digital signal pro-
cessors. The more digital logic present in the design and the
higher the switching speed, the more difficult it will be to
achieve good performance from the converter.
Due to the single ground pin of the DAC7512, all return
currents, including digital and analog return currents, must
flow through the GND pin. Ideally, GND would be con-
nected directly to an analog ground plane. This 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 power applied to VDD 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. This is particularly true for the
DAC7512, as the power supply is also the reference voltage
for the DAC.
As with the GND connection, VDD should be connected to
a +5V power supply plane or trace that is separate from the
connection for digital logic until they are connected at the
power entry point. In addition, the 1
F to 10F and 0.1F
bypass capacitors are strongly recommended. In some situ-
ations, 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 lowpass
filter the +5V supply, removing the high-frequency noise.
FIGURE 10. Bipolar Operation with the DAC7512.
DAC7512
V
DD
V
OUT
R
1
10k
R
2
10k
Three-Wire
Serial
Interface
+5V
10
F
0.1
F
–5V
±5V
+5V
OPA251
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| DAC7512N/3K | SERIAL INPUT LOADING, 8 us SETTLING TIME, 12-BIT DAC, PDSO6 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC7513 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low-Power, Rail-to-Rail Output, 12-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER |
| DAC7513E | 制造商:Texas Instruments 功能描述:IC 12BIT DAC SMD 7513 VSSOP8 |
| DAC7513E/250 | 功能描述:数模转换器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7513E/250G4 | 功能描述:数模转换器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7513E/2K5 | 功能描述:数模转换器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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