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Part Number: LT1684
Description: The LT®1684 is a telecommunication ring tone generator.The IC takes a user-generated pu...
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LT1684
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DataSheet
General Description
LT1684 General 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.
LT1684 Maximum Ratings
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
(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
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 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
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
LT1684 Typical Application
Wireless Local Loop Telephones
Key System/PBX Equipment
Fiber to the Curb Telecom Equipment
Key System/PBX Equipment
Fiber to the Curb Telecom Equipment
LT1684 Connection Diagram
LT1684
PDF/DataSheet Download
- Datasheet: LT1684
- File Size: 276462 KB
- Manufacturer: Linear
- Click here to Download
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