LT1684
LT1684
ObsoleteMicropower Ring Tone Generator
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Overview
- This product is pending obsolescence - Contact Analog Devices for more information
- Allows Dynamic Control of Output Frequency, Cadence, Amplitude and DC Offset
- Active Tracking Supply Configuration Allows Linear Generation of Ring Tone Signal
- No High Voltage Post-Filtering Required
- Capacitive Isolation Eliminates Optocouplers
- Low Distortion Output Meets International PTT Requirements
- Differential Input Signal for Noise Immunity
- User Adjustable Active Output Current Limit
- Powered Directly From High Voltage Ringer Supply—No Additional Supplies Necessary
- Supply Current: <1mA
- 2% Signal Amplitude Reference
- Available in 14-Pin SO and DIP Packages
The LT1684 is a telecommunication ring tone generator. The IC takes a user-generated pulse width modulated (PWM) input and converts it to a high voltage sine wave suitable for telephone ringing applications.
The LT1684 receives capacitor-isolated differential PWM input signals encoded with desired ring output cadence, frequency, and amplitude information. The LT1684 normalizes the pulse amplitude to ±1.25V for an accurate signal voltage reference. The cadence, frequency and amplitude information is extracted using a multiple-pole active filter/amplifier, producing the output ring tone signal.
The LT1684 uses its own ring tone output as a reference for generating local supply rails using complementary high voltage external MOSFETs as dynamic level-shifting devices. This 'active tracking' supply mode of operation allows linear generation of the high voltage ring tone signal, reducing the need for large high voltage filtering elements.
Applications
- Wireless Local Loop Telephones
- Key System/PBX Equipment
- Fiber to the Curb Telecom Equipment
Documentation
Data Sheet 1
User Guide 1
Technical Articles 2
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LT1684CS | TELCOM Ring Tone Generator, +5VIN, 20-REN Output
Resources
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