FFM72011

Self Interference canceller module for 2.4 GHz coexistence

Applications | Key features | Block diagram | Specifications | Configuration | Glossary

Note these are preliminary details and subject to change.

Modern connected devices must increasingly integrate multiple wireless transceivers, such as Wi-Fi and Bluetooth, Zigbee or Thread, operating within the same 2.4 GHz frequency band. When these radios operate simultaneously, the transmitted signal from one transceiver can couple into the receiver of another, causing receiver desensitisation, reduced communication range, packet loss and degraded system performance. This interference can occur even when the radios operate on different, non-overlapping channels, as the limited physical separation between antennas and RF circuits makes achieving sufficient isolation increasingly challenging.

FFM72011 addresses this challenge through adaptive RF signal cancellation, suppressing unwanted transmitter leakage before it impacts the neighbouring receiver. This enables simultaneous operation of independent wireless transceivers while reducing the need for antenna separation, complex filtering or time-based coexistence management.

FFM72011 is designed to support concurrent radio operation, reduce dependence on physical separation and provide greater flexibility when integrating multiple radios within a single product.

Applications

  • IoT devices and gateways
  • Smart-home hubs
  • Security products
  • Smartphones
  • Smart wearables

Key features

  • Compatible with all 2.4GHz wireless standards and protocols
  • I2C control interface
  • Configurable cancellation
  • Two independent RF paths
  • 1.8 V supply operation
  • 15-30 dB additional isolation
  • Compact footprint: 2.5 x 2.5 x 0.7 mm

Functional Block Diagram

Electrical Specifications

Absolute maximum ratings

Parameter Conditions Rating Symbol(s)
Storage Temperature -40 to +150°C
Operating Temperature Functional, no damage -30 to +110°C
Supply Voltage -0.5 to +2.0 V VDD
Signal Voltage -0.5 to +2.0 V SDA, SCL
RF input power (CW); TRx1, TRx2 23 dBm Pin_TRx
RF input power (Peak Envelope Power); Trx1, Trx2 Pulsed CW, 1% duty cycle, 10us pulse duration 33 dBm PEP_TRx
RF input power (CW); Ant1, Ant2 Self-interference power at antenna port 23 dBm Pin_TRx
RF input power (Peak Envelope Power); Ant1, Ant2 Self-interference power at antenna port; Pulsed CW, 1% duty cycle, 10us pulse duration 33 dBm PEP_TRx
Source/Load VSWR Any phase 10:1 RF1 & RF2

Recommended operating conditions

Parameter Conditions Min Typ Max Symbol(s)
Operating frequency range 2400 MHz 2500 MHz
Operating ambient temperature Functional, no damage -20 °C +25 °C +85 °C
Supply voltage +1.62 V 1.8 V +1.98 V VDD
Digital Control Signals - High +0.7 x VDD +1.8 V VDD SDA; SCL
Digital Control Signals - Low +0.5 V 0 V +0.3 x VDD SDA; SCL
SCL Frequency 100 kHz 400 kHz SCL
RF input power (CW); TRx1, TRx2 20 dBm Pin_TRx
RF input power (Peak Envelope Power); Trx1, Trx2 Pulsed CW, 1% duty cycle, 10us pulse duration 30 dBm PEP_TRx

RF Specifications

Unless otherwise stated: All ports terminated with 50 Ohms; T-25C; VDD=1.8V

Parameter Conditions Unit Min Typ Max
Operating frequency range MHz 2400 2500
Isolation TRx1 to TRx2
Antennas connected at Ant1 and Ant2
Antenna pair conforms to Antenna Coupling Specification with Antenna Isolation >15dB;
Application circuit configured for specific Antennas;
Canceller settings configured for specific Antennas;		 dB 35 45
Isolation TRx1 to TRx2
Antennas connected at Ant1 and Ant2
Antenna pair conforms to Antenna Coupling Specification with Antenna Isolation >35dB;
Application circuit configured for specific Antennas;
Canceller settings configured for specific Antennas;		 dB 50 60
Insertion Loss TRx1 to Ant1; TRx2 to Ant2 dB 1.8 2.0
Input Return Loss Relative to 50 Ohms; applicable to all RF ports dB 10

Recommended antenna pair specification

All ports terminated with 50 Ohms

Parameter Conditions Unit Min Typ Max
Operating frequency range MHz 2400 2500
Antenna Isolation Between each Wi-Fi antenna and the ZigBee antenna; Defined between antenna feed connection points to antenna isolator PCB ports dB 15 35
Antenna Coupling Phase Between each Wi-Fi antenna and the ZigBee antenna; Defined between antenna feed connection points to antenna isolator PCB ports Degrees 0 360
Input Return Loss Relative to 50 Ohms; Both Wi-Fi antennas and ZigBee antenna dB 6

Module Pin Configuration

Label Type Description
TRx1 RF Connection to transceiver 1
TRx2 RF Connection to transceiver 2
Ant1 RF Connection to Antenna 1
Ant2 RF Connection to Antenna 2
Cfg1 RF RF configuration pin 1
Cfg2 RF RF configuration pin 2
Cfg3 RF RF configuration pin 3
VDD RF Main DC power supply
GND RF Ground
SDA Digital I2C data
SCL Digital I2C clock
Addr0 Digital I2C address select pin 0
Addr1 Digital I2C address select pin 1
Addr2 Digital I2C address select pin 2

Product handling and soldering

Handling precautions and ESD ratings

Parameter Rating Standard
ESD – Human Body Model Class 1C (1kV) ESDA/JEDEC JS-001-2023
ESD – Charged Device Model Class C2a (500V) ESDA/JEDEC JS-002-2022
MSL–Moisture Sensitivity Level MSL3 IPC/JEDEC J-STD-020

Solderability

Compatible with lead-free (260°C max. reflow temperature) soldering process.

RoHS compliance

This part is compliant with the 2011/65/EU RoHS directive.