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參數(shù)資料
| 型號(hào)： | AS8412 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封裝： | DIP-20 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 116K |
| 代理商： | AS8412 |
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High Performance Automotive Sonar Intrusion – Data Sheet
AS8412
March 2001
Page 8 of 14
As a general rule, the best approach is to measure the voltage at the “valley”, that normally
occurs at the end of the echo waveform. If it is above 1.8 V, then the system could benefit from
some extra gain.
A pre-amplifier that satisfies the bias requirements is shown at the Fig. 4. Its gain is around
8 dB.
Fig. 4 - Recommended pre-amplifier
Sensitivity Programming
The AS8412 allows the sensitivity to intrusions and movements to be programmed at produc-
tion, so the manufacturer can adapt the detector to different requirements.
There are two possible ways of programming the sensitivity:
Digital programming by the pins SENS1 and SENS0: controls the criteria used by the dis-
criminator to validate intrusions or movements. Four sensitivities are available, as shown at
Table 1.
Table 1. Digital programmable sensitivities
SENS1
SENS0
Sensitivity
1
1
High
1
0
Mid-high
0
1
Mid-low
0
0
Low
Capacitor at the pin VCAP: controls the analog processing of the echo signal at the enve-
lope detector. With smaller capacitors, the digitized echo signal will have a higher resolution
and, as a result, a higher sensitivity will be obtained.
The best combination of digital programming and VCAP capacitor is usually determined by
experiment. A generally good choice is to use sensitivity mid-high and 270-pF capacitor at
VCAP.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AS8413 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION |
| AS8424-A | 制造商:Coilcraft Inc 功能描述:DSL transformer, for AD20MSP910/918, not RoHS |
| AS8425-A | 制造商:Coilcraft Inc 功能描述:DSL transformer, for Motorola MC145660, not RoHS |
| AS8426-A | 制造商:Coilcraft Inc 功能描述:DSL transformer, for Alcatel MTK-20140, not RoHS |
| AS8444 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Programmable PWM DC Motor Driver / Controller |
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