AS3909 Datasheet, PDF (1/77 Pages) ams AG – 13.56 MHz RFID Reader IC, ISO-14443 A/B

General Description
AS3909/AS3910
13.56 MHz RFID Reader IC,
ISO-14443 A/B
The AS3909/10 is a high performance 13.56MHz HF RFID Reader
IC.
The AS3909/10 is unequalled in the domain of HF Reader ICs; it
contains two differential low impedance (1.5Ω) antenna
drivers.
These drivers are unmatched, which means that the IC can
deliver up to 8 times the output power of a standard HF Reader
IC using the same power supply voltage.
Additionally using this configuration means half of the power
consumption at the same output power.
The IC has an operating voltage down to 2.4V and a low power
operating mode of 5mA. This means the AS3909/10 is ideal for
portable or battery powered applications.
For applications where high power is required the AS3909/10
can attain up to 700mW. This means 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.
The analog front end (AFE) is complemented by a highly
integrated data framing engine for both ISO-14443 A and B.
This includes data rates up to 848kbits with all framing and
synchronization tasks on board. This enables the customer to
build a complete HF RFID Reader using only a low end micro.
The AS3909/10 not only supports reader to tag communication,
but sports Peer to Peer communication using the NFCIP-1 active
communication mode with a data rate of 106kbps.
The IC has a SPI, which enables bi-directional communication
with the external microcontroller.
Other standard and custom protocols, such as ISO -15693 or
Felica can be implemented via transparent mode.
Only available in AS3910: In addition to the above mentioned
advantages, AS3910 also features the ams' unique Automatic
Antenna Tuning (AAT)¹ technology. With AAT, the device is
optimized for application with directly driven antenna and
enables the reader to retune itself to deliver maximum output
at 13.56MHz, when the surroundings detunes the antenna.
For further understanding in regards to the contents of the
datasheet, please refer to the Reference Guide located at the end
of the document.
1. Only available in AS3910.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 1