Micropower ring tone generator converts a user-generated PWM input into a high-voltage sine wave for telephone ringing applications. The device uses capacitor-isolated differential PWM inputs and normalizes the signal to a ±1.25 V reference. Active tracking supply operation supports linear ring tone generation with complementary external high-voltage MOSFETs and reduces the need for large high-voltage filtering elements. Supply current is less than 1 mA, and adjustable output current limiting supports typical ring tone output drive capability. Commercial and industrial temperature grades were specified in 14-lead PDIP and 14-lead plastic SO packages.
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| Function | Micropower ring tone generator |
| Input signal type | Differential PWM |
| Input carrier frequency | 10kHz |
| Minimum valid differential input | 1.6V |
| Differential input threshold | 0.50 to 1.00, 0.70 typicalV |
| Differential input overdrive impedance | 7 minimum, 10 typicalkΩ |
| Single-ended input impedance | 50kΩ |
| DC supply current | 680 typical, 950 maximumµA |
| Normalized BG OUT voltage magnitude | 1.250 typicalV |
| BG OUT short-circuit current | ±2 minimum, ±4.5 typicalmA |
| BG OUT rise time | 160 typical, 300 maximumns |
| BG OUT fall time | 260 typical, 400 maximumns |
| OUT short-circuit current | ±100 minimum, ±190 typicalmA |
| Local supply differential voltage absolute maximum | -0.3 to 36V |
| Commercial operating junction temperature | 0 to 125°C |
| Industrial operating junction temperature | -40 to 125°C |
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These are design resources that include the Linear Technology LT1684
Quick start guide for the DC192A demo circuit, showcasing the LT1684 for telephone ring signal generation with cadenced and continuous modes via a PIC16C73 microcontroller.
