Datasheet
Table Of Contents
- 1 Features
- 2 Applications
- 3 Description
- 4 Simplified Diagram
- Table of Contents
- 5 Revision History
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
- 9 Parameter Measurement Information
- 10 Detailed Description
- 11 Application and Implementation
- 12 Power Supply Recommendations
- 13 Layout
- 14 Device and Documentation Support
- 15 Mechanical, Packaging, and Orderable Information
LM567
,
LM567C
SNOSBQ4E –MAY 1999–REVISED DECEMBER 2014
www.ti.com
11 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
11.1 Application Information
The LM567 tone decoder is a device capable of detecting if an input signal is inside a selectable range of
detection. The device has an open collector transistor output, so an external resistor is required to achieve
proper logic levels. When the input signal is inside the detection band, the device output will go to a LOW state.
The internal VCO free running frequency establishes the detection band central frequency. An external RC filter
is required to set this frequency. The bandwidth in which the device will detect the desired frequency depends on
the capacitance of loop filter terminal. Typically a 1µF capacitor is connected to this pin. The device detection
band has a different behavior for low and high input voltage levels. Refer to the Operation With V
i
< 200m – V
RMS
section and the Operation With V
i
> 200m – V
RMS
section for more information.
12 Submit Documentation Feedback Copyright © 1999–2014, Texas Instruments Incorporated
Product Folder Links: LM567 LM567C