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參數(shù)資料
| 型號： | TLV5638JG |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | MOSFET P-CH 20V 5.3A 8-SOIC |
| 中文描述： | 2.7 V至5.5 V低功耗雙通道12位數(shù)字至模擬轉(zhuǎn)換器，具有內(nèi)部參考和斷電 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 289K |
| 代理商： | TLV5638JG |
TLV5638
2.7 V TO 5.5 V LOW POWER DUAL 12-BIT DIGITAL-TO-ANALOG
CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN
SLAS225A – JUNE 1999 – REVISED JANUARY 2000
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Examples of operation: (continued)
Both outputs are updated on the rising clock edge after D0 from the DAC A data word is sampled.
To output data consecutively using the same DAC configuration, it is not necessary to program the CONTROL
register again.
Set power-down mode:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X = Don’t care
linearity, offset, and gain error using single ended supplies
When an amplifier is operated from a single 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 attempts to drive the output to a negative voltage. However, because the most negative
supply rail is ground, the output cannot drive below ground and clamps the output at 0 V.
The output voltage then remains at zero until the input code value produces a sufficient positive output voltage
to overcome the negative offset voltage, resulting in the transfer function shown in Figure 14.
DAC Code
Output
Voltage
0 V
Negative
Offset
Figure 14. Effect of Negative Offset (Single Supply)
This offset error, not the linearity error, produces this breakpoint. The transfer function would have followed the
dotted line if the output buffer could drive below the ground rail.
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 supply operation does not
allow for adjustment when the offset is negative due to the breakpoint in the transfer function. So the linearity
is measured between full-scale code and the lowest code that produces a positive output voltage.
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| TLWB | TELUX LED |
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