參數(shù)資料
型號(hào)： DAC8830IBD
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： DAC
英文描述： SERIAL INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDSO8
封裝： GREEN, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 13/29頁(yè)
文件大?。?/td> 687K
代理商： DAC8830IBD
www.ti.com
Output Amplifier Selection
Reference and Ground
Power Supply and Reference Bypassing
SLAS449D – FEBRUARY 2005 – REVISED SEPTEMBER 2007
For bipolar mode, a precision amplifier should be used, supplied from a dual power supply. This provides the
±VREF output.
In a single-supply application, selection of a suitable operational amplifier may be more difficult because the
output swing of the amplifier does not usually include the negative rail; in this case, AGND. This output swing can
result in some degradation of the specified performance unless the application does not use codes near 0.
The selected operational amplifier needs to have low-offset voltage (the DAC LSB is 38
μV with a 2.5 V
reference), eliminating the need for output offset trims. Input bias current should also be low because the bias
current multiplied by the DAC output impedance (approximately 6.25 k
) adds to the zero-code error.
Rail-to-rail input and output performance are required. For fast settling, the slew rate of the operational amplifier
should not impede the settling time of the DAC. Output impedance of the DAC is constant and
code-independent, but in order to minimize gain errors the input impedance of the output amplifier should be as
high as possible. The amplifier should also have a 3 dB bandwidth of 1 MHz or greater. The amplifier adds
another time constant to the system, thus increasing the settling time of the output. A higher 3 dB amplifier
bandwidth results in a shorter effective settling time of the combined DAC and amplifier.
Since the input impedance is code-dependent, the reference pin should be driven from a low impedance source.
The DAC8830 and DAC8831 operate with a voltage reference ranging from 1.25 V to VDD. References below
1.25 V result in reduced accuracy.
The DAC full-scale output voltage is determined by the reference. Table 1 and Table 2 outline the analog output
voltage for particular digital codes.
For optimum performance, Kelvin sense connections are provided on the DAC8831. If the application does not
require separate force and sense lines, they should be tied together close to the package to minimize voltage
drops between the package leads and the internal die.
For accurate high-resolution performance, it is recommended that the reference and supply pins be bypassed
with a 10
μF tantalum capacitor in parallel with a 0.1 μF ceramic capacitor.
20
Copyright 2005–2007, Texas Instruments Incorporated
Product Folder Link(s): DAC8830 DAC8831
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相關(guān)代理商/技術(shù)參數(shù)
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DAC8830IBDTG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Ultra-Lo Pwr Vltg Output Cnvtr 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(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)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
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