AS3910 HF RFID Reader ICt

ams offers the AS3910 that is unequalled in the domain of HF reader ICs

Image of ams AS3910 HF RFID Reader ICams AS3910 is a high performance 13.56MHz HF RFID reader IC. With unique antenna management technology, it is optimized for applications that have directly driven antennas. The AS3910 is unique in the domain of HF RFID reader ICs in that it contains two differential low impedance (1.5 Ω) antenna drivers. These drivers are unmatched, meaning the IC can deliver up to eight times the output power of a standard HF RFID reader IC using the same power supply voltage. Additionally, using this configuration results in half the power consumption at the same output power.

The IC has an operating voltage down to 2.4 V and a low-power operating mode of 5 mA making the AS3910 ideal for battery powered applications. For applications where high power is required (EMV), the AS3910 can attain up to 700 mW. There is no need for complex external booster circuitry. The component count and complexity of the design is further reduced through the patented automatic modulation depth adjustment.

A highly integrated data-framing engine compliments the analog front end (AFE) for both ISO14443 A and B. This includes data rates up to 848 kb/s with all framing and synchronization tasks onboard. This enables the customer to build a complete HF RFID reader using a low-end micro.

The AS3910 not only supports reader-to-tag communication but also allows for peer-to-peer communication using the NFCIP-1 active communication mode with a data rate of 106 kb/s. The IC has an SPI, which enables bi-directional communication with the external microcontroller. Other standard and custom protocols can be implemented via transparent mode.

View Block Diagram

Features and Benefits
  • Close loop adjustment of ASK modulation for accurate control of modulation depth in case of ISO-14443B protocol
  • High output power at 3.3 V power supply:
    • Up to 700 mW when regulator is externally shorted
    • Up to 500 mW when differential output and antenna trimming is used
    • Up to 125 mW when of single ended output and antenna trimming is used
  • Antenna trimming system providing correction range of LC
  • Low-power operating mode reduces receiver consumption from 10 mA to 5 mA
  • Additional A/D converter input, serial peripheral interface (SPI) with 32-byte FIFO
  • QFN 32 5 x 5 package
  • Transparent mode to implement other standard and custom protocols (ISO-15693, Felica, and more)
  • Quartz oscillator capable of operating with 13.56 MHz or 27.12 MHz crystal with fast startup
  • AM/PM demodulator to eliminate communication holes
  • Low-power (3.5 µA) NFC target mode
  • Integrated regulators to boost system PSRR
  • Accurate RF envelope measurement (8-bit A/D)
  • User selectable and automatic gain control
  • Supply voltage range from 2.4 V to 3.6 V
  • Wide temperature range: -40°C to 85°C
  • Squelch feature that performs gain reduction to compensate for noise generated by transponder processing
  • RSSI measurement
  • Add-on module for handheld computers, PDAs
  • Point of sales solutions
  • UHF RFID reader systems
  • RFID label printers
  • Hand-held UHF RFID readers
  • Mobile phones
  • Shelf readers
  • Toll systems
Published: 2013-07-02