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参数资料
| 型号： | DAC8571IDGKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 13 us SETTLING TIME, 16-BIT DAC, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 17/30页 |
| 文件大小： | 825K |
| 代理商： | DAC8571IDGKR |
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OUTPUT VOLTAGE STABILITY
SETTLING TIME AND OUTPUT GLITCH PERFORMANCE
USING REF02 AS A POWER SUPPLY FOR DAC8571
REF02
15 V
5 V
VDD, Vref
A0
SCL
SDA
2-Wire
l2C
Interface
VOUT = 0 V to 5 V
DAC8571
160 mA )
5 V
5 kW
+ 1.16 mA
LAYOUT
DAC8571
SLAS373A – DECEMBER 2002 – REVISED JULY 2003
The DAC8571 exhibits excellent temperature stability of 5 ppm/
°C typical output voltage drift over the specified
temperature range of the device. This enables the output voltage of each channel to stay within a
±25 V window
for a
±1°C ambient temperature change. Good power supply rejection ratio (PSRR) performance reduces supply
noise present on VDD from appearing at the outputs to well below 10 V. Combined with good dc noise
performance and true 16-bit differential linearity, the DAC8571 becomes a perfect choice for closed-loop control
applications.
Settling time to within the 16-bit accurate range of the DAC8571 is achievable within 10 s for a full-scale code
change at the input. Worst case settling times between consecutive code changes is typically less than 2 s,
therefore, the update rate is limited by the I
2C interface for digital input signals changing code-to-code. For
full-scale output swings, the output stage of each DAC8571 channel typically exhibits less than 100-mV
overshoot and undershoot when driving a 200-pF capacitive load. Code-to-code change glitches are extremely
low (~10V) given that the code-to-code transition does not cross an Nx4096 code boundary. Due to internal
segmentation of the DAC8571, code-to-code glitches occur at each crossing of an Nx4096 code boundary.
These glitches can approach 100 mVs for N = 15, but settle out within ~2 s.
Due to the extremely low supply current required by the DAC8571, a possible configuration is to use a REF02
5-V precision voltage reference to supply the required voltage to the DAC8571's supply input as well as the
reference input, as shown in Figure 33. This is especially useful if the power supply is quite noisy or if the system
supply voltages are at some value other than 5 V. The REF02 outputs a steady supply voltage for the DAC8571.
If the REF02 is used, the current it needs to supply to the DAC8571 is 160-A typical and 225-A max for VDD =
5 V. When a DAC output is loaded, the REF02 also needs to supply the current to the load. The total typical
current required (with a 5-k
load on a given DAC output) is:
Figure 33. REF02 as a Power Supply
The load regulation of the REF02 is typically 0.005%/mA, which results in an error of 290 V for a 1.16-mA
current drawn. This corresponds to a 3.82 LSB error for a 0-V to 5-V output range.
A precision analog component requires careful layout, adequate bypassing, and clean, well-regulated power
supplies.
The power applied to VDD and VREF should be well regulated and low noise. Switching power supplies and dc/dc
converters often has 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 easily
couples into the DAC output voltage through various paths between the power connections and analog output.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC8571IDGKRG4 | 功能描述:数模转换器- DAC Lo-Pwr R-To-R Output 16-Bit I2C 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 |
| DAC8574 | 制造商:TI 制造商全称:Texas Instruments 功能描述:QUAD, 16-BIT, LOW-POWER, VOLTAGE OUTPUT, I2C INTERFACE DIGITAL-TO-ANALOG CONVERTER |
| DAC8574EVM | 功能描述:数据转换 IC 开发工具 DAC8574 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| DAC8574IPW | 功能描述:数模转换器- DAC Lo-Pwr Quad R-To-R Out 16-Bit I2C 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 |
| DAC8574IPWG4 | 功能描述:数模转换器- DAC Lo-Pwr Quad R-To-R Out 16-Bit I2C 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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