DS1870 is a dual-channel bias controller for AB class LDMOS RF power amplifier applications. It controls the 256 positions of the potentiometer through look-up table (LUT) based on the amplifier temperature, drain voltage or drain current (or other external monitoring signals). DS1870 has internal temperature sensor and multi-channel A/D converters (ADCs) to provide a cost-effective solution, using nonlinear compensation techniques to improve power amplifier efficiency, which traditional bias solutions cannot provide.
The Maxim DS1870 is a programmable dual‑channel bias controller designed for AB‑class LDMOS RF power amplifiers. It provides temperature‑compensated bias control using a 256‑position digital potentiometer and includes on‑chip ADCs for monitoring voltage, current and temperature.
The document details absolute maximum ratings, recommended operating conditions, analog monitoring characteristics, lookup‑table programming, pin functions and advanced I²C‑bus applications, allowing up to eight devices on a single bus and offering a 32‑byte EEPROM for user data. This manual is written in Chinese.
| Supply Current (ICC) | 1 mA – 2 mA |
|---|---|
| Input Logic High (VIH) | 0.7 × VCC |
| Operating Temperature Range | -40 °C to +95 °C |
| EEPROM User Memory | 32 bytes |
| Potentiometer Wiper Positions | 256 positions |
The EEPROM provides 32 bytes of user‑accessible storage.
The potentiometer offers 256 discrete wiper positions.