LT1684CS#TR

Product Summary

The LT1684CS#TR is a telecommunication ring tone generator. The LT1684CS#T takes a user-generated pulse width modulated (PWM) input and converts it to a high voltage sine wave uitable for telephone ringing applications. The LT1684CS#TR receives capacitor-isolated differential PWM input signals encoded with desired ring output cadence, and amplitude information. Applications of the LT1684CS#TR include: wireless local loop Telephones, key system/pbx equipment, fiber to the curb telecom equipment.

Parametrics

LT1684CS#TR absolure maximum ratings: (1) Voltages: a)Active Tracking Differential Voltage (GATE+ — GATE -) : -0.3V to 42V; b) Local Supply Differential Voltage (V+ — V-: -0.3V to 36V; c) Local Supply Voltage+: (GATE+ — 7.0V) to (GATE+ to +0.3V) ; d) Local Supply Voltage-: (GATE- — 0.3V) to (GATE+ to +7.0V) ; e) PWM Input Differential Voltage(INA — INB) :-7.0V to 7.0V; f) PWM Input Voltage Common Mode: (V- - 0.3V) to (V+ +0.3V); h) LIM+ Current Limit Pin Voltage: (OUT -0.3V) to (V+ +0.3V) ; i) LM- Current Limit Pin Voltage: (V- -0.3V) to (OUT +0.3V) ; j) All other Pin Voltages: (V- -0.3V) to (V+ +0.3V) ;(2) Currents: a) LIM+, LIM- Current: -350mA; b) OUT CURRENT: 350mA; c) BGout Current: ±10mA; d) PWM(INA,INB) Current: ±5mA; e) GATE+, GATE- Current: ±20mA; f) COMP1 Current: ±1mA; g) COMP2 Current: ±1mA; h) ATref Current: ±20mA;(3)Temperatures: a) Operating Junction Temperature Range: Commercial Grade: 0°C to 125°C, Industrial Grade: -40°C to 125°C; b) Storage Temperature Range: -65°C to 150°C; d) Lead Temperature (Soldering, 10 sec) : 300°C.

Features

LT1684CS#TR features: (1) Allows Dynamic Control of Output Frequency, Cadence, Amplitude and DC Offset; (2) Active Tracking Supply Configuration Allows Linear Generation of Ring Tone Signal; (3) No High Voltage Post-Filtering Required; (4) Capacitive Isolation Eliminates Optocouplers; (5) Capacitive Isolation Eliminates Optocouplers PTT Requirements; (6) Differential Input Signal for Noise Immunity; (7) User Adjustable Active Output Current Limi; (8) Powered Directly From High Voltage Ringer Supply (TM) No Additional Supplies Necessar; (9) Supply Current: <1mA; (10) 2% Signal Amplitude Reference; (11) Available in 14-Pin SO and DIP Packages.

Diagrams