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| 型號(hào)： | XE8802MI035LF |
| 廠商： | Semtech |
| 文件頁(yè)數(shù)： | 37/193頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS 16BIT FLASH 8K 100-LQFP |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | XE880x |
| 應(yīng)用： | 感測(cè)機(jī) |
| 核心處理器： | Coolrisc816? |
| 程序存儲(chǔ)器類(lèi)型： | 閃存（22 kB） |
| 控制器系列： | XE8000 |
| RAM 容量： | 1K x 8 |
| 接口： | SPI，UART |
| 輸入/輸出數(shù)： | 36 |
| 電源電壓： | 2.4 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 100-LQFP |
| 包裝： | 托盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 100-LQFP（14x14） |
| 產(chǎn)品目錄頁(yè)面： | 585 (CN2011-ZH PDF) |
| 配用： | XE8000MP-ND - PROG BOARD AND PROSTART2 CARD |
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Semtech 2006
www.semtech.com
17-19
XE8802 Sensing Machine Data Acquisition MCU
with ZoomingADC and LCD driver
Figure 17-8. Integral non-linearity of the ADC (PGA disabled, reference voltage of 4.8V)
The different PGA stages have been designed to find the best compromise between the noise performance, the
integral non-linearity and the power consumption. To obtain this, the first stage has the best noise performance and
the third stage the best linearity performance. For large input signals (small PGA gains, i.e. up to about 50), the
noise added by the PGA is very small with respect to the input signal and the second and third stage of the PGA
should be used to get the best linearity. For small input signals (large gains, i.e. above 50), the noise level in the
PGA is important and the first stage of the PGA should be used.
The following figures give the non-linearity for different gain settings of the PGA, selecting the appropriate stage to
get the best noise and linearity performance. Figure 17-9 shows the non-linearity when the third stage is used with
a gain of 1. It is of course not very useful to use the PGA with a gain of 1 unless it is used to compensate offset. By
increasing the gain, the integral non-linearity becomes even smaller since the signal in the amplifiers reduces.
Figure 17-10 shows the non-linearity for a gain of 2. Figure 17-11 shows the non-linearity for a gain of 5. Figure
17-12 shows the non-linearity for a gain of 10. By comparing these figures to Figure 17-8, it can be seen that the
third stage of the PGA does not add significant integral non-linearity.
Figure 17-13 shows the non-linearity for a gain of 20 and Figure 17-14 shows the non-linearity for a gain of 50. In
both cases the PGA2 is used at a gain of 10 and the remaining gain is realized by the third stage. It can be seen
again that the second stage of the PGA does not add significant non-linearity.
For gains above 50, the first stage PGA1 should be selected instead of PGA2. Although the non-linearity in the first
stage of the PGA is larger than in stage 2 and 3, the gain in stage 3 is now sufficiently high so that the non-linearity
of the first stage does become negligible as is shown in Figure 17-15 for a gain of 100. Therefore, the first stage is
preferred over the second stage since it has less noise.
Increasing the gain further up to 1000 will further increase the linearity since the signal becomes very small in the
first two stages. The signal is full scale at the output of stage 3 and as shown in Figure 17-9 to Figure 17-12, this
stage has very good linearity.
Not
Recommended
for
New
Designs
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相關(guān)代理商/技術(shù)參數(shù) |
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| XE8805 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Data Acquisition MCU |
| XE8805AMI000 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Data Acquisition MCU |
| XE8805AMI028LF | 功能描述:IC DAS 16BIT FLASH 8K MTP 64LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器 - 特定應(yīng)用 系列:XE880x 產(chǎn)品變化通告:Product Discontinuation 26/Aug/2009 標(biāo)準(zhǔn)包裝:250 系列:- 應(yīng)用:網(wǎng)絡(luò)處理器 核心處理器:4Kc 程序存儲(chǔ)器類(lèi)型:- 控制器系列:- RAM 容量:16K x 8 接口:以太網(wǎng)，UART，USB 輸入/輸出數(shù):- 電源電壓:1.8V, 3.3V 工作溫度:- 安裝類(lèi)型:表面貼裝 封裝/外殼:208-LQFP 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:PG-LQFP-208 其它名稱(chēng):SP000314382 |
| XE8805AMI028TLF | 制造商:Semtech Corporation 功能描述: |
| XE8805MI028 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Data Acquisition MCU |
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