This is a document about TDA 5221 ASK/FSK Single Conversion Receiver, which introduces the features and characteristics of the product in detail
The TDA5221 is a very low power consumption single‑chip FSK/ASK superheterodyne receiver for the frequency band 300 to 340 MHz. It integrates a low‑noise amplifier, double‑balanced mixer, VCO, PLL synthesiser, crystal oscillator, limiter with RSSI generator, demodulators, data filter, slicer and peak detector, plus a power‑down mode for ultra‑low standby current.
Typical applications include keyless entry, remote‑control, alarm and low‑bitrate communication systems. The device operates from a 5 V supply (±10%) and offers selectable frequency ranges of 300‑320 MHz and 320‑340 MHz, with ASK sensitivity better than –110 dBm and FSK sensitivity better than –102 dBm across –40 °C to +105 °C.
| Supply current (FSK mode) | 6.4 mA typ. |
|---|---|
| Supply current (ASK mode) | 5.6 mA typ. |
| Supply voltage range | 5 V ±10% |
| Power‑down current | 50 nA typ. |
| ASK sensitivity | better than –110 dBm (‑40 °C to +105 °C) |
| FSK sensitivity | better than –102 dBm (‑40 °C to +105 °C) |
| Frequency band | 300 MHz – 340 MHz |
| Selectable frequency ranges | 300‑320 MHz and 320‑340 MHz |
| Limiter RSSI generation frequency | 10.7 MHz |
| Package | TSSOP‑28 |
The typical supply current in FSK mode is 6.4 mA.
It supports a frequency band from 300 MHz to 340 MHz, with selectable sub‑ranges of 300‑320 MHz and 320‑340 MHz.
The power‑down mode draws about 50 nA typical.