CS209A

Features:

· Separate Current Regulator for Oscillator
· Negative Transient Suppression
· Variable Low-Level Feedback
· Improved Performance over Temperature
· 6mA Supply Current Consumption at VCC = 12V
·Output Current Sink Capability
    20mA at 4VCC
   100mA at 24VCC


Pinout




Specifications

Supply Voltage ...........................................................................................24V
Power Dissipation (TA = 125).............................................................200mW
Storage Temperature Range ....................................................-55 to +165
Junction Temperature...............................................................-40 to +150
Electrostatic Discharge (except TANK pin) ....................................................2kV
Lead Temperature Soldering
    Wave Solder(through hole styles only) .....................10 sec. max, 260 peak
    Reflow (SMD styles only) ....................60 sec. max above 183¡C, 230 peak


Description

The CS209A is a bipolar monolithic integrated circuit for use in metal detection/ proximity sensing applications. The IC (see block diagram) 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 CS209A, 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 envelop 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 CS209A is included to absorb negative transients at the tank circuit terminal.