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LT1684CS Datasheet(PDF) 1 Page - Linear Technology |
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LT1684CS Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1684 Micropower Ring Tone Generator s Allows Dynamic Control of Output Frequency, Cadence, Amplitude and DC Offset s Active Tracking Supply Configuration Allows Linear Generation of Ring Tone Signal s No High Voltage Post-Filtering Required s Capacitive Isolation Eliminates Optocouplers s Low Distortion Output Meets International PTT Requirements s Differential Input Signal for Noise Immunity s User Adjustable Active Output Current Limit s Powered Directly From High Voltage Ringer Supply—No Additional Supplies Necessary s Supply Current: < 1mA s 2% Signal Amplitude Reference s Available in 14-Pin SO and DIP Packages 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 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 nor- malizes 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. s Wireless Local Loop Telephones s Key System/PBX Equipment s Fiber to the Curb Telecom Equipment IN A GATE+ IN B 6.8nF IRF9610 IRF610 100k V+ P1 µC P2 LIM+ OUT BGOUT ATREF COMP1 COMP2 AMPIN LIM– V– GATE– 100pF 1N4001 20pF 100pF 100pF DC ISOLATION PWM CONTROLLER 100 Ω 10k 10k 1N5817 0.1 µF 1 µF 3k 5k 2k 300k 6.8nF 100k 100 Ω RING TONE OUTPUT ±100mA CAPABILITY 100V + – –100V LT1684 4700pF 1684 TA01 FB1 () FB1: FERRONICS FMB1601 (716) 388-1020 FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. Electrically Isolated Ring Tone Generator |
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