© Semiconductor Components Industries, LLC, 2006

July, 2006 − Rev. 3

1

Publication Order Number:

CS209A/D

CS209A

Proximity Detector

The CS209A is a bipolar monolithic integrated circuit for use in

metal detection/proximity sensing applications. The IC (see Figure 1)

contains two on−chip current regulators, oscillator and low−level

feedback circuitry, peak detection/demodulation circuit, a comparator

and two complementary output stages.

The oscillator, along with an external LC network, provides

controlled oscillations where amplitude is highly dependent on the Q

of the LC tank. During low Q conditions, a variable low−level

feedback circuit provides drive to maintain oscillation. The peak

demodulator senses the negative portion of the oscillator envelope and

provides a demodulated waveform as input to the comparator. The

comparator sets the states of the complementary outputs by comparing

the input from the demodulator to an internal reference. External loads

are required for the output pins.

A transient suppression circuit is included to absorb negative

transients at the tank circuit terminal.

Features

http://onsemi.com

SO−14

D SUFFIX

CASE 751A

1

14

1

8

DIP−8

N SUFFIX

CASE 626

1

8

SO−8

D SUFFIX

CASE 751

1

CS209A

AWLYWW

14

MARKING

DIAGRAMS

1

8

CS209A

AWL

YYWW

1

209A

ALYWX

8

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

Device

Package

Shipping

ORDERING INFORMATION

CS209AYN8

DIP−8

50 Units/Rail

CS209AYD8

SO−8

95 Units/Rail

CS209AYDR8

SO−8

2500 Tape & Reel

CS209AYD14

SO−14

55 Units/Rail

CS209AYDR14

SO−14

2500 Tape & Reel