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TDA7255V

ASK/FSK 434 MHz Wireless Transceiver

Infineon Technologies 

1

Product Description

TDA7255V

Product Description

1.1

Overview

The TDA7255V is an ASK/FSK single-channel transceiver for 433 - 435 MHz frequency band in a tiny VQFN-40

package. Due to the very high level of integration the device requires only a few external components. The

extreme low current consumption in receive, transmit and especially in power down mode and the wide supply

voltage range make TDA7255V the ideal choice for small, battery driven applications.

The device contains a low noise amplifier (LNA), a double balanced mixer, a fully integrated VCO, a PLL

synthesizer, a crystal oscillator with FSK modulator, a limiter with RSSI generator, a FSK demodulator, a data filter,

a data comparator (slicer), a positive and a negative data peak detector, a highly efficient power amplifier and a

complex digital timing and control unit with I2C/3-wire microcontroller interface. Additionally there is a power down

feature to save battery power.

The transmit section uses direct ASK modulation by switching the power amplifier, and crystal oscillator detuning

for FSK modulation. The necessary detuning load capacitors are external. The capacitors for fine tuning are

integrated. The receive section is using a novel single-conversion/direct-conversion scheme that is combining the

advantages of both receive topologies. The IF is contained on the chip, no RF channel filters are necessary as the

channel filter is also on the chip.

The self-polling logic can be used to let the device operate autonomously as a master for a decoding

microcontroller.

1.2

Features

• FSK and ASK modulation and demodulation capability without external circuitry changes, FM demodulation

capability

• Frequency range: 433 to 435 MHz

• Sensitivity FSK typically -115 dBm at 4 kbit/s data rate

• Sensitivity ASK typically -112 dBm at 4 kbit/s data rate

• Transmit power up to +13 dBm

• Low supply current (Is = 9 mA typ. in receive mode, Is = 13,5 mA typ. in transmit mode (both at 3 V supply

voltage, 25°C)

• Very low supply current in power down mode (5 nA typ.)

• Supply voltage range: 2.1 V to 5.5 V

• Data rates up to 100 kbit/s Manchester encoded

• Fully integrated PLL synthesizer including VCO and loop filter on-chip with on-chip crystal oscillator tuning

• Differential receive signal path completely on-chip, therefore no external filters are necessary

• On-chip low pass channel select and data filter with tuneable bandwidth

• Data slicer with self-adjusting threshold and 2 peak detectors

• Self-polling logic with adjustable duty cycle and ultrafast data rate detection and timer mode providing

periodical interrupt

• Adjustable LNA gain

• Digital RSSI and battery voltage readout

• Clock Out Pin for external microcontroller

• I2C/3-wire microcontroller interface, working at max. 400 kbit/s

• Operating temperature range -40°C to +85°C

• 5.5 x 6.5 mm small VQFN-40 package

Data Sheet

6

Revision 1.1, 2010-11-10

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