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Tuner ICs serve Japanese mobile-broadcast TV

Posted: 11 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated Products? power management IC? power management chip? dual-mode tuner? tuner?

Maxim Integrated Products is fabbing two power-managed chip types for designers of Japanese digital broadcast products. The company's MAX2161 and MAX2162 are dual-band dual-mode tuners. The small size of these devices lets users design television sub-systems that meet the tiny-footprint and low-height requirements of Japanese cellphone-TVs.

The devices downconvert UHF and VHF Band III signals, and support both 1-Segment and 3-Segment broadcasts using the Integrated Services Digital Broadcasting (ISDB-T) standard. Operating frequency extends across the 170MHz through 222MHz VHF band (ISDB-TSB) and the 470MHz through 770MHz UHF band.

Highly integrated
Both ICs contain all blocks needed to implement a low-IF (intermediate frequency) TV tuner, except for a quartz crystal and front-end filters needed to reject interfering cellular signals. Both ICs pack LNAs, variable-gain RF amplifiers, down-converting mixers, power detectors, IF variable-gain amplifiers, and low-IF bandpass filtering.

These devices can operate with either high-side or low-side local oscillator injection. The variable-gain amplifiers provide in excess of 106dB of gain-control range. Phase noise is also low, with a typical spec of just -85dBc/Hz (at 10kHz).

Monolithic VCOs, tank circuits
Both chips also include monolithic VCOs (voltage-controlled oscillators), and monolithic tank circuits, as well as complete frequency synthesizers. They can operate with crystal or temperature compensated crystal oscillators from 32MHz to 40MHz.

A fixed divide-by-2 frequency divider is provided for the oscillator, supporting simplified interfacing to various channel decoders.

In operation, these ICs can withstand adjacent analog-TV interference of greater than 50dBc, at a sensitivity of -95dB. This interference rejection reduces both filter complexity and cost. Typical image rejection is 48dB.

In mobile-TV mode, the devices achieve a maximum sensitivity of -98-dBm (2.9?V), with no external filters or amplifiers.

Serial control
The MAX2161 features an I2C-compatible serial interface. The MAX2162 uses a 3-wire interface for IC-to-IC communication.

The tuners operate from 2.7V to 3.3V supply voltages, over a -40C to 85C temperature range. They typically dissipate 110mW in a low-power mode. The low-power Standby mode shuts down the entire RF signal path, leaving serial interface and register circuits active. These devices can also be entirely shut down through either the serial interface or an external logic pin.

These devices are available in custom 46-pin WLPs (wafer-level packages). Each device is fully RF tested during production. 40-pin TQFN-EP versions (dubbed the MAX2161ETL and MAX2162ETL) will be available in the future.

Pricing starts at about $4 each in 1,000-up quantities.

- Alex Mendelsohn

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