This is an application note that introduces the correct use of the LNBH24 device. The LNBH24 is an integrated solution for supplying/interfacing two independent LNB down-converters in the antenna dishes. It gives good performance in a simple and cheap way, minimum external components are required. It comprises all the functions that allow the realization of a dual tuner STB with supplying/interfacing functions in accordance with international standards. Moreover, it includes an I2C bus interface and, thanks to a fully integrated step-up DC-DC converter, it works with a single input voltage supply for a reasonable range.
This application note provides additional information and suggestions for the correct use of the LNBH24 device, an integrated solution for supplying and interfacing two independent LNB downconverters in antenna dishes. The device includes a fully integrated step-up DC-DC converter, allowing it to work with a single input voltage supply ranging from 8 V to 15 V.
| Input voltage range | 8 V to 15 V |
|---|---|
| Undervoltage lockout threshold | 6.7 V typ. |
| Power-on reset threshold | 7.3 V typ. |
| Minimum output current flag threshold | 12 mA |
| Overtemperature flag threshold | 150 °C |
Tone output starts with about 1.5T delay after the 1% cycle of the TTL signal.
The device operates with a single input voltage supply ranging from 8 V to 15 V.
The IMON bit is set to '1' if the output current is lower than 12 mA, typically, with ITEST=1.
The OTF bit is set to '1' if the junction temperature exceeds 150 °C.