Micropower ring tone generator converts a user-generated PWM input into a high-voltage sine wave for telephone ringing applications. The device receives capacitor-isolated differential PWM inputs carrying cadence, frequency, amplitude, and DC-offset information. An active tracking supply architecture uses external complementary high-voltage MOSFETs to generate local supply rails while reducing high-voltage post-filtering requirements. The IC draws less than 1 mA of supply current and provides a 2% signal amplitude reference. Package options include 14-pin SO and 14-pin PDIP versions.
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| Function | Micropower ring tone generator |
| Input signal type | Differential PWM |
| PWM input carrier frequency | 10kHz |
| DC supply current | 680 typ, 950 maxµA |
| Signal amplitude reference accuracy | 2% |
| Minimum valid differential input | 1.6 minV |
| Differential input threshold | 0.50 min, 0.70 typ, 1.00 maxV |
| Differential input overdrive impedance | 7 min, 10 typkΩ |
| Single-ended input impedance | 50kΩ |
| BG OUT normalized voltage magnitude | 1.250 typV |
| BG OUT short-circuit current | ±2 min, ±4.5 typmA |
| BG OUT rise time | 160 typ, 300 maxns |
| BG OUT fall time | 260 typ, 400 maxns |
| OUT short-circuit current | ±100 min, ±190 typmA |
| Active tracking differential voltage rating | -0.3 to 42V |
| Local supply differential voltage rating | -0.3 to 36V |
| Commercial operating junction temperature | 0 to 125°C |
| Industrial operating junction temperature | -40 to 125°C |
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