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LT1684

Features: Allows Dynamic Control of Output Frequency,Cadence, Amplitude and DC Offset Active Tracking Supply Configuration Allows LinearGeneration of Ring Tone Signal No High Voltage Post-Filtering Required Capacitive Isolation Eliminates Optocouplers Low Distortion Output Meets InternationalPTT ...

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LT1684: Features: Allows Dynamic Control of Output Frequency,Cadence, Amplitude and DC Offset Active Tracking Supply Configuration Allows LinearGeneration of Ring Tone Signal No High Voltage Post-Filtering...

LT1684 Data Sheet

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Part Number:
LT1684
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

Allows Dynamic Control of Output Frequency,Cadence, Amplitude and DC Offset
Active Tracking Supply Configuration Allows LinearGeneration of Ring Tone Signal
No High Voltage Post-Filtering Required
Capacitive Isolation Eliminates Optocouplers
Low Distortion Output Meets InternationalPTT Requirements
Differential Input Signal for Noise Immunity
User Adjustable Active Output Current Limit
Powered Directly From High Voltage RingerSupply-No Additional Supplies Necessary
Supply Current: <1mA
2% Signal Amplitude Reference
Available in 14-Pin SO and DIP Packages


Application

Wireless Local Loop Telephones
Key System/PBX Equipment
Fiber to the Curb Telecom Equipment


Pinout

Connection Diagram


Specifications

Active Tracking Differential Voltage
(GATE+ GATE) ..................................0.3V to 42V
Local Supply Differential Voltage
(V+ V) ...............................................0.3V to 36V
Local Supply
Voltage V+ ................ (GATE+ 7.0V) to (GATE+ + 0.3V)
Local Supply
Voltage V .............. (GATE 0.3V) to (GATE + 7.0V)
PWM Input Differential Voltage
(IN A IN B) .............................................7.0V to 7.0V
PWM Input Voltage
Common Mode ..................... (V 0.3V) to (V+ + 0.3V)
LIM+ Current Limit
Pin Voltage ......................... (OUT 0.3V) to (V+ + 0.3V)
LIM Current Limit
Pin Voltage ........................ (V 0.3V) to (OUT + 0.3V)
All Other Pin Voltages ........... (V 0.3V) to (V+ + 0.3V)
LIM+, LIM Current ......................................... 350mA
OUT Current ........................................................ 350mA
BGOUT Current ................................................... ±10mA
PWM (IN A, IN B) Current ..................................... ±5mA
GATE+, GATE Current ...................................... ±20mA
COMP1 Current .................................................... ±1mA
COMP2 Current .................................................... ±1mA
ATREF Current .................................................... ±20mA
Temperatures:
Operating Junction Temperature Range
Commercial Grade .................................... 0°C to 125°C
Industrial Grade .................................. 40°C to 125°C
Storage Temperature Range ............... 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C


Description

The LT®1684 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 wavesuitable for telephone ringing applications.

The LT1684 receives capacitor-isolated differential PWMinput signals encoded with desired ring output cadence,frequency, and amplitude information. The LT1684 nor-malizes the pulse amplitude to ±1.25V for an accuratesignal voltage reference. The cadence, frequency andamplitude information is extracted using a multiple-pole active filter/amplifier, producing the output ring tonesignal.

The LT1684 uses its own ring tone output as a referencefor generating local supply rails using complementaryhigh voltage external MOSFETs as dynamic level-shiftingdevices. This "active tracking" supply mode of operationallows linear generation of the high voltage ring tonesignal, reducing the need for large high voltage filteringelements.




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