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參數(shù)資料
| 型號： | AS8413 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 消費家電 |
| 英文描述： | HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 125K |
| 代理商： | AS8413 |
High Performance Automotive Sonar Intrusion – Data Sheet
AS8413
March 2001
Page 8 of 15
Analog Conditioning
The analog front-end, composed of a preamplifier and a filter centered at 40 kHz, increases the
signal level and removes noise outside the bandpass. It is followed by a digitally-controlled AGC
amplifier, that keeps signal level at the VCAP output within prescribed levels. Finally, an envelope
detector extracts the information embedded in the amplified echo signal.
The front-end needs proper bias during power-up. That can be provided by an RC series circuit
to VDD, as shown at Fig. 2, or alternatively, by the pre-amplifier of Fig. 4.
VDD
Fig. 2 - Series-RC circuit at RX
100n
100k
To RX-Pin
The AS8413 has a wide dynamic range, to follow the signal fluctuations that occur in a large
variety of vehicles, sensors and environmental conditions. Only under extreme conditions, like in
a larger vehicle, an external pre-amplifier at RX may help to improve performance.
A practical way to verify if a pre-amplifier might be useful, is by monitoring the echo waveform at
VCAP. For measuring that voltage a FET-input buffer (input impedance at least 10
9
ohm) should
be used, as the output impedance at VCAP is very high.
A pre-amplifier that satisfies the bias requirements is shown at the Fig. 4. Its gain is around 8 dB.
0
10
20
30
40
T(ms)
Period = 44, 4 ms
VCAP(V)
3,0V-4,2V
1,3V-1,8V
Fig. 3 - Waveform at VCAP
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