General Description
The AS3910 is a high performance 13.56MHz HF RFID Reader IC. With austriamicrosystems’ unique antenna management technology it is optimized for applications with directly driven antennas. The AS3910 is unequalled in the domain of HF Reader ICs in that it contains two differential low impedance (1.5Ω) antenna drivers. These drivers are unmatched meaning the IC can deliver up to 8 times the output power of a standard HF Reader IC using the same power supply voltage.

KEY FEATUREs
● Close loop adjustment of ASK modulation for accurate control of modulation depth in case of ISO-14443B protocol
● Antenna trimming system providing correction range of LC
● Low power operating mode reduces receiver consumption from 10mA to 5mA
● Low power (3.5µA) NFC target mode
● Integrated regulators to boost system PSRR
● AM/PM demodulator to eliminate communication holes
● RSSI measurement
● Accurate RF envelope measurement (8 bit A/D)
● High output power at 3.3V power supply:
   - up to 1W in case regulator is externally shorted
   - up to 500mW in case differential output and antenna trimming is used
   - up to 125mW in case of single ended output and antenna trimming is used
● Squelch feature which performs gain reduction to compensate for noise generated by transponder processing
● User selectable and automatic gain control
● Transparent mode to implement other standard and custom protocols (ISO-15693, Felica, ….)
● Quartz oscillator capable of operating with 13.56MHz or 27.12MHz crystal with fast start-up
● Additional A/D converter input, Serial peripheral interface (SPI) with 32 byte FIFO
● Supply voltage range from 2.4V to 3.6V
● Wide temperature range: -40ºC to 85ºC
● QFN 32 5x5 package

APPLICATIONs
The AS3910 is ideal for applications where the reader antenna is directly driven (no 50Ω cable). It also includes several unique features, which make it especially suitable for low power and battery powered applications.