PW0268 PROWAVE, PW0268 Datasheet

PW0268

Manufacturer Part Number

PW0268

Description

IC, ULTRASONIC SONAR RANGING, SSOP-20

Manufacturer

PROWAVE

Datasheet

1.PW0268.pdf (14 pages)

Specifications of PW0268

Supply Current

11mA

Supply Voltage Range

5.5V To 11V

Sensor Case Style

SSOP

No. Of Pins

Operating Temperature Range

-40Â°C To +85Â°C

Termination Type

SMD

Supply Voltage Max

11V

Filter Terminals

SMD

Rohs Compliant

Yes

Frequency Response Max

250kHz

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Ultrasonic Sonar Ranging IC - PW0268

Description:

The PW-0268 ultrasonic sonar ranging IC is ideally suited for echo ranging systems. This chip has many design

features to enhance its performance and ease of use in this application.

The externally tunable RC Oscillator automatically tracks and compensates for the shift of the resonate frequency

of the transducer due to temperature changes.

The Fix Gain Preamplifier can be tailored to compensate for varying transducer sensitivities. The 32-step Time

Controlled Variable Gain Amplifier slope can be modified by adjusting the frequency of the system clock.

An onboard Comparator converts the analog signal of the returning echo to a TTL level digital signal for use with

an external microprocessor.

The integrated Band Pass Filters can be adjusted for custom applications by changing a few external components.

The frequency of the System Clock can be adjusted to control other operating parameters of the chip including the

transmit pulse width and sample rate.

The I_O pin, (pin 1) is a bi-direction pin and is designed as an open collector connection with an internal pull high

resistor. When the I_O pin is being pulled low by an external transistor, the RC oscillator generates a tone burst

signal at DRIVER_0 (pin 11), the output driver stage for the transducer. After the transmit pulse, the I_O pin, (pin 1)

will again go low if a valid echo signal is detected.

The reflected echo signal is presented to the first stage pre-amplifier through ECHO (pin 10). The gain of

pre-amplifier can be adjusted to accommodate transducers with varying sensitivities by changing an external

resistor between ECHO (pin 10) and GR_I (pin 9).

The 32 steps time controlled variable gain amplifier input TCG_I (pin7) and output TCG_O (pin 6) is synchronized

to start incrementing at the end of control pulse signal I-O, (pin 1) and is reset at the beginning of the next control

pulse.

Only a few passive components are needed for the active band pass filter. There are two stages, a low pass, LP_I

(pin 5) and LP_O (pin 4) and upper band pass, HP_I (pin 3) to HP_O (pin 2). The center frequency and

bandwidth of the filter are chosen based on the type of ultrasonic transducer being used and the specific application.

The amplified echo signal after being filtered is routed to a comparator, which shapes and coverts the analog echo

signal into digital signal outputted at I_O (pin 1) for further µP handling.

The unique temperature compensating Ultrasonic R/C Oscillator circuitry tracks the resonant frequency drift of the

transducer that is causes by environment temperature changes. Simply adding dual diodes and one resistor between

DRIVER_O (pin 11) and Ftrace (pin 12) is all that is needed to complete this function.

SSOP20

Features:

Operating Voltage: 6 – 10Vdc single source

Operating Frequency: broadband output ranging up to 250KHz

Variable R/C Oscillator: compensates for transducer resonate

frequency drift due to temperature.

High Gain Amplifier: varies with time over 32 steps

Integrated Band Pass Filter: reduces external component count

Bi-direction I/O Pin: simplifies the control function for

transmitting a pulse and receiving an echo

An adjustable System Clock: enables the control of, the

number of pulses transmitted, the slope of the variable gain

amplifier, and the pulse repetition rate.

The PW0268 IC is suitable for use in car reversing aids,

electronic tape measures and other sonar ranging applications.

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Related parts for PW0268

PW0268 Summary of contents

Page 1

... An adjustable System Clock: enables the control of, the number of pulses transmitted, the slope of the variable gain amplifier, and the pulse repetition rate. The PW0268 IC is suitable for use in car reversing aids, electronic tape measures and other sonar ranging applications. 1 ...

Page 2

... System Clock Timer High-Speed Comparator LP_O LP_I TCG_O Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw ORC3 ORC2 ORC1 Ultrasonic R/C Oscillator Auto Frequency Tracking 32 Steps Fixed Gain TCG Amp Amp TCG_I GR_O 20 Vref 19 Vcc 18 Vreg 17 GND ...

Page 3

... Driver_O I_OVIH I_OVIL I_OVOH I_OVOL I_OIOL Rup Symbol Condition Vcc Topr Tstg I_O，Vcc Vimax Others Iimax 3 Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw Min. Typ. Max. 5 3.8 4 -3.0 0 +3.0 0.4 0. 300 350 610 660 0.001 ...

Page 4

... Description Pin Vcc Vreg 47K 22p R1 100u 660KHZ PW0268 2200p 4.7K 2.7K 680p 680p 13K 4.7K 470p Vref Vref 4 Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw Name Description Driver_O Transducer driving output Ftrace Frequency tracing input ...

Page 5

... Output at Pin 1 I_O: H: 1ms/Div., V: 5.0V/Div. Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw The RC oscillator will be enabled in the duration of input pulse. The maximum pulse width is 396/F and any time longer than this upper limit will be ignored. The next input pulse will be ignored if the pulse repetition rate is shorter than 9900/F + pulse width ...

Page 6

... For additional information about an 18-meter tape measure circuit, please consult with the factory. R1(Ohm) R2(Ohm) 3,300 1,500 3,300 1,500 2,000 0 6 Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw R3(Ohm) C1(pF) 511 2,200 604 2,200 2,100 220 ...

Page 7

... Time Controlled Gain Amplifier The time controlled gain amplifier is stepping up once the input pulse falling. The time duration can be calculated as 220 Steps F: Frequency of System Clock 7 Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com. ...

Page 8

... Package and Dimensions: 20 Pins, SSOP (150mil) Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw 8 ...

Page 9

... Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw 9 ...

Page 10

... R1 0.003 - θ - 0° θ1 - 5° θ2 - 0° aaa 0.004 bbb 0.008 ccc 0.004 ddd 0.007 eee 0.004 10 Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw Max. 0.069 0.010 0.065 0.012 0.011 0.010 0.009 0.050 - - 8° 15° - ...

Page 11

... The dambar can not be located on the lower radius of the foot. 9. Refer to JEDEC MO-137 variation AD. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION Pro-Wave Electronics Corp. Tel: 886-2-22465101 Fax: 886-2-22465105 E-mail: sales@pro-wave.com.tw URL: http://www.prowave.com.tw Copyright © 2004 Pro-Wave Electronics Corp. 9/15/2004 11 ...

Page 12

... Bi-directional I/O Measuring distance SRM400 1. Module board 2. 400EP14D enclosed type transducer of asymmetrical beam patterns, see detail specification of 400EP14D. 3. Detail electrical schematic prowave@ms3.hinet.net; Tel: 886-2-22465101(5 lines), 22459774; Fax: 886-2-22465105 SRM400 DC6 - 10V <20 mA ＠DC10V max. Fc: 38 KHz Bandwidth: 20KHz Insertion loss 130Vpp ...

Page 13

... Point: Transducer loading “E” Point: Main 32 Steps TCG Amplifier Refer to PW-0268 Sonar Ranging IC Vcc Vreg 1K 47K 22p 3.3K 100u 660KHZ PW0268 2200p 4.7K 2.7K 680p 680p 13K 4.7K 470p Vref Vref “B” Point: H: 0.5ms/div V: 5V/div “D” Point ...

Page 14

... K4000001 K4000002 40.0 KHz 40.0 KHz 10.6 mH± 6% 10.6 mH± 100 1:10 1:10 400EP14D 400EP14D (Temperature Compensated Type prowave@ms3.hinet.net; Tel: 886-2-22465101(5 lines), 22459774;Fax: 886-2-22465105 Series Shunt Drive Resistance Capacitance Level Ohm pF 35,000 2.3 0.001 35,000 2.3 0.001 ...

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