Datasheet > DA5546

DA5546

更新时间： 2024-11-21 21:15:39

品牌	Logo	应用领域
TEMIC		电信光电二极管电信集成电路
页数	文件大小	规格书
5页	54K
描述
Telecom Circuit, 1-Func, CMOS, PDSO20, SOIC-20

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DA5546 技术参数

生命周期：	Transferred	包装说明：	SOIC-20
Reach Compliance Code：	unknown	风险等级：	5.71
JESD-30 代码：	R-PDSO-G20	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
认证状态：	Not Qualified	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
电信集成电路类型：	TELECOM CIRCUIT	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子位置：	DUAL
Base Number Matches：	1

DA5546 数据手册

DA5546

Single Chip Ultrasonic Alarm Processing Circuit

Description

The DA5546 is a single chip ultrasound signal The synchronous demodulator system which monitors

processing IC, intended for automotive applications for both the magnitude and phase of the return signal gives

detecting intrusion into an ultrasound field where a significant improvement in sensitivity and noise

automatic gain control (AGC) is not required or in rejection compared to more basic systems. The logic

applications with a user sensitivity adjustment. The IC level alarm output of the DA5546 enables it to be part

was developed as an Application Configurable System of a microprocessor controlled security system. The

Cell (ACSC), either to be used as a stand alone circuit, DA5546 is implemented in a 1.2um double poly double

or as part of a larger custom circuit designed to suit metal CMOS process and runs from a single 5V supply

specific application requirements. The DA5546 with a basic power consumption of 5mW (excluding

contains all the circuit functions necessary to implement transmit sensor power). The device is available in a 20

an advanced low power, high sensitivity ultrasonic pin SOIC package.

movement detection system.

Features

· Complete stand alone system

· A low noise 40kHz preamplifier for the receive

sensor

· Sensitive to both amplitude and phase disturbances

· 5mW active power consumption

· Synchronous demodulator to extract Doppler tones

caused by moving objects

· A master clock oscillator with an external ceramic

resonator

· Second order low-pass and high-pass filters to define

the Doppler frequency range and reduce the effect of

thermal air movement inside the vehicle

· Threshold detector and time averaging integrator

reduces the effect of transient noise and wind

· Compact 20 pin SOIC package

· A clock divider and transmit sensor driver

System Overview

The front-end bandpass filter removes out of band noise 0.1m/s to 2m/s. Further gain is applied to the signal

and interference, particularly the effects of EMC, and together with a second high-pass/low-pass filter, to

prevents amplifier overload.

The output of the remove the effects of slow air movement caused by

amplifier is fed to a synchronous demodulator. This convection currents inside the vehicle. The output of

gives an output that is proportional to both the the second filter is monitored by a window comparator

amplitude and phase of the return signal giving a with +/-200mV thresholds: any Doppler tones larger

significant increase in sensitivity, as the phase of the than this will cause the integration capacitor connected

return signal varies much more rapidly than the to the CEV pin to be charged up. When this capacitor

amplitude when intrusions occur. An additional benefit is charged to 2.5V the alarm output pin ALR will go

is the high degree of rejection of wideband noise since high. If no Doppler tones are present then the

only signals coherent with the transmitter excitation are integration capacitor is discharged at a much slower

recognised.

rate. With a capacitor of 47nF fitted between the CEV

pin and ground, Doppler tones must be present for a

least 400ms before the ALR output goes high.

The demodulator output is high-pass and low-pass

filtered and amplified to extract the Doppler tones

caused by moving object with velocities in the range of

Dialog Semiconductor

Rev. B, 4-October-97

12 3 4 5

中文翻译

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