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參數資料
| 型號： | TLC7226EDW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | QUAD, PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁數： | 2/20頁 |
| 文件大小： | 280K |
| 代理商： | TLC7226EDW |
TLC7226C, TLC7226E
QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS060C – JANUARY 1995 – REVISED OCTOBER 2000
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
linearity, offset, and gain error using single-ended power supplies
When an amplifier is operated from a single power supply, the voltage offset can still be either positive or
negative. With a positive offset, the output voltage changes on the first code change. With a negative offset the
output voltage may not change with the first code depending on the magnitude of the offset voltage.
The output amplifier, with a negative voltage offset, attempts to drive the output to a negative voltage. However,
because the most negative supply rail is ground, the output cannot be driven to a negative voltage.
So when the output offset voltage is negative, the output voltage remains at zero volts until the input code value
produces a sufficient output voltage to overcome the inherent negative offset voltage, resulting in a transfer
function shown in Figure 8.
DAC Code
Output
Voltage
0 V
Negative
Offset
Figure 8. Effect of Negative Offset (Single Power Supply)
This negative offset error, not the linearity error, produces the breakpoint. The transfer function would have
followed the dotted line if the output buffer could be driven to a negative voltage.
For a DAC, linearity is measured between zero input code (all inputs 0) and full scale code (all inputs 1) after
offset and full scale are adjusted out or accounted for in some way. However, single power supply operation does
not allow for adjustment when the offset is negative due to the breakpoint in the transfer function. So the linearity
in the unipolar mode is measured between full scale code and the lowest code which produces a positive output
voltage.
The code is calculated from the maximum specification for the negative offset.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TLC7226I | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS |
| TLC7226IDW | 功能描述:數模轉換器- DAC Quad DAC 8bit RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| TLC7226IDWG4 | 功能描述:數模轉換器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| TLC7226IDWR | 功能描述:數模轉換器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| TLC7226IDWRG4 | 功能描述:數模轉換器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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