Microsemi has made a radio for implantable medical devices such as pacemakers, cardiac defibrillators and neurostimulators measuring 5.5mm x 4.5mm x 1.5mm.
RF technology is increasingly being used in a wide variety of medical implantable applications including cardiac care, physiological monitoring (e.g., insulin), pain management and obesity treatments.
The ZL70323 implantable module implements all RF-related functions needed to deploy the implant node in a Medical Implantable Communications Service (MICS) RF telemetry system.
The integrated antenna tuning circuit allows the module to be used with a wide range of implantable antennas (nominal antenna impedance is 100+j150 ohms). The module provides the following major blocks:
• ZL70103-based MICS-band RF transceiver with integrated matching network, surface acoustic wave (SAW) filter for suppression of unwanted blockers, and antenna tuning;
• 2.45 gigahertz (GHz) wake-up receiver matching network;
• Integrated 24 megahertz (MHz) reference frequency crystal;
• Decoupling capacitors and series termination resistors
The device operates in the 402–405 MHz MICS band. Multiple low power wake-up options are supported including using an ULP 2.45 GHz industrial, scientific and medical (ISM) band wake-up receive option. The ZL70103 consumes less than 6 mA when transmitting or receiving and consumes only 290 nA when in a periodic sleep/sniff mode (1 second sniff interval).
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