Peregrine Semiconductor Corporation has announced availability of the RoHS- compliant PE64904 and PE64905 DuNETM digitally tunable capacitors (DTCs). The 5-bit, 32-state digitally controlled variable capacitors aim to provide a monolithically integrated impedance tuning solution for RF applications. These UltraCMOSTM-based devices are well suited for use in wide-band tunable networks, minimizing mismatch losses, improving system efficiency and reducing radio complexity for a cost-effective tuning solution. Design applications for the new DTC devices range from tunable filters and matching networks to RFID, antenna tuning and other wireless communications where tunability and optimal system performance is critical.
The solid-state devices can be used in series or shunt configurations. Capacitance range is 0.7-4.6 pF in discrete 126 fF steps (6.6:1 tuning ratio) in series configuration, and 1.1-5.1 pF in discrete 131 fF steps (4.6:1 tuning ratio) in shunt configuration. The quality factor (Q) for a shunt-configured DTC is ~35 for lowest capacitance state (at 1 GHz). To address the requirements of peripheral interface programming, both 3-wire SPI-compatible (PE64904) and 2-wire I2C-compatible (PE64905) serial control versions are available.
Both devices are manufactured on Peregrine’s UltraCMOS silicon-on-sapphire (SOS) process. Key specifications:
- RF power handling >+38 dBm @ 50 Ω, 30 Vpk RF
- power supply range 2.3-3.6V
- current consumption typ. 140 μA at 2.6V
- built-in bias voltage generation
- 2kV HBM ESD tolerance on all pins
- IIP2 is +105 dBm and IIP3 is +65 dBm (typ) across 100 MHz to 3 GHz
- immune to latch-up
The company’s HaRPTM
technology design enhancements have been applied to deliver harmonic performance of 75 dBc (2fo and 3fo) across the tuning range; 12 μs switching time; and 10 μs settling time.
Price and Availability
The PE64904 and PE64905, scheduled for volume production in Q3 2011, are housed in the 2x2mm 10-lead QFN package and priced at $1.45 each (10K units). Evaluation Kits for each device, which are designed for accurate DTC impedance measurement and loss, include cables and USB interface board and are priced at $168.00 each. Design-in quantities and evaluations kits are available through Peregrine’s global network of fully trained “DTC Advocates” which can be located on the DTC support page at dtc.psemi.com. Samples are available to qualified customers through Peregrine’s global direct sales representatives.