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參數(shù)資料
| 型號： | WM2627 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Quad 8-Bit Serial Input Voltage Output DAC |
| 中文描述： | 四8位串行輸入電壓輸出DAC |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 107K |
| 代理商： | WM2627 |
WM2627
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 April 2001
10
APPLICATIONS INFORMATION
LINEARITY, OFFSET, AND GAIN ERROR
Amplifiers operating from a single supply can have positive or negative voltage offsets. With a
positive offset, the output voltage changes on the first code transition. However, if the offset is
negative, the output voltage may not change with the first code, depending on the magnitude of the
offset voltage. This is because with the most negative supply rail being ground, any attempt to drive
the output amplifier below ground will clamp the output at 0 V. The output voltage then remains at
zero until the input code is sufficiently high to overcome the negative offset voltage, resulting in the
transfer function shown in Figure 7.
DAC code
Negative
Offset
Output
Voltage
0 V
Figure 7 Effect of Negative Offset
This offset error, not the linearity error, produces the breakpoint. The transfer function would follow
the dotted line if the output buffer could drive below the ground rail.
DAC linearity is measured between zero-input code (all input bits at 0) and full-scale code (all inputs
at 1), disregarding offset and full-scale errors. However, due to the breakpoint in the transfer function,
single supply operation does not allow for adjustment when the offset is negative. In such cases, the
linearity is therefore measured between full-scale and the lowest code that produces a positive (non-
zero) output voltage.
POWER SUPPLY DECOUPLING AND GROUNDING
Printed circuit boards with separate analogue and digital ground planes deliver the best system
performance. The two ground planes should be connected together at the low impedance power
supply source. Ground currents should be managed so as to minimise voltage drops across the
ground planes.
A 0.1
μ
F decoupling capacitor should be connected between the positive supply and ground pins of
the DAC, with short leads as close as possible to the device. Use of ferrite beads may further isolate
the system analogue supply from the digital supply.
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| WM2627IDT | Quad 8-Bit Serial Input Voltage Output DAC |
| WM2629 | Octal 8-bit, Serial Input, Voltage Output DAC with Power Down |
| WM2630CDT | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630 | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630IDT | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| WM2627CDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Quad 8-Bit Serial Input Voltage Output DAC |
| WM2627IDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Quad 8-Bit Serial Input Voltage Output DAC |
| WM2629 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 8-bit, Serial Input, Voltage Output DAC with Power Down |
| WM2630 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630CDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
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