The ADF7901 is a low power OOK/FSK UHF transmitter designed for use in RF remote control devices. It is capable of frequency shift keying (FSK) modulation on eight different channels, selectable by three external control lines. OOK modulation is performed by modulating the PA control line.
The ADF7901 is a single‑chip, low‑power UHF transmitter designed for RF remote‑control devices. It operates from 369.5 MHz to 395.9 MHz using a fractional‑N PLL and integrated VCO, supports OOK and FSK modulation at data rates up to 50 kbps, and offers eight channel selections via three external control lines. Power‑down mode draws less than 1 µA.
The datasheet provides detailed specifications, pin functions, typical performance graphs, layout guidelines, and ordering information for the 24‑lead TSSOP package. It also includes recommended loop‑filter components and ESD handling precautions.
| Supply voltage (VDD) | 3.0 V |
|---|---|
| Frequency range | 369.5 MHz – 395.9 MHz |
| Number of channels | 8 |
| Maximum output power | 12 dBm |
| Transmit current consumption (12 dBm) | 26 mA |
| Power‑down current | <1 µA |
| Maximum data rate | 50 kbps |
| Modulation depth (OOK) | 83 dB |
| Operating temperature range | 0 °C – 50 °C |
The device operates from a 3.0 V supply.
It provides eight channels that can be selected with three external control lines.
In power‑down mode the IC draws less than 1 µA.
Both OOK and FSK modes support data rates up to 50 kbps.