Electronic Design


MP3 Decoder Comes With ADPCM Voice Recording Option
The STA015 MPEG layer 3 audio decoder chip includes an embedded adaptive differential pulse code modulation (ADPCM) codec. This device adds MP3 audio playback and voice recording/playback capabilities to enhanced mobile phones without consuming much power. Its VLIW DSP core is specially optimized for audio applications, consuming 85 mW at 2.4 V. Meanwhile, the STA015 MP3doc (decoder on a chip) decodes layer 3 compressed elementary streams as specified in the ISO MPEG-1 and MPEG-2 standards. It also decodes streams encoded with low sampling rates as specified by MPEG-2.5.

The serial interfaces are used for input and output, so the circuit can be housed in an SO28 small outline package. The TQFP44 and LBGA packages have additional parallel and serial interfaces. The output interface is software-programmable, so it can adapt to the most common digital-to-analog architectures. Also, the ADPCM codec complies with the G.726 standard and offers better sound quality than the DVI audio playback support by versions of the STA013.

Available in mid-2000, the STA015 will cost $10.00 in 1000-unit batches.

STMicroelectronics, Lexington Corp. Center, 10 Maguire Rd., Bldg. 1, third floor, Lexington, MA 02421; (781) 861-2650; fax (781) 861-2678; www.st.com.

High-Frequency CMOS Prescaler Consumes 7.85 mA At 3 V
The PE3501 high-frequency CMOS divide-by-two prescaler performs prescaling functions for microwave frequency synthesis applications up to 4.0 GHz. Its total power consumption is 7.85 mA at a 3-V operating voltage. Using a patented ultra-thin silicon (UTSi) process, it operates at less than a volt with a cost structure comparable to CMOS. When combined with low-frequency PLLs, it permits microwave frequency synthesis. Its minimum output power over the frequency range is −9.5 dBm at a 0-dBm input power level. According to its manufacturer, this output drive is 3 dB greater than competitive devices. It operates from −40°C to 85°C. Available in an 8-pin TSSOP package, it costs $2.32 each in 10,000-unit quantities.

Peregrine Semiconductor Corp., 6175 Nancy Ridge Dr., San Diego, CA 92121; (858) 455-0660; fax (858) 455-0770; Internet: www.peregrine-semi.com.

85-W Power Transistor Packaged In A 34- By 19-mm Footprint
The PTF10160 power transistor has a flat, 16 ±0.2-dB power gain over the 869- to 894-MHz and 921- to 960-MHz ranges, with a typical 53% efficiency. This 85-W device comes in the manufacturer's 20248 package. It has a 3- by 19-mm footprint, including flanges. Also, it's designed to run from a standard 26-V power supply. The drain-source breakdown voltage is 65 V. At 25 W PEP, the third-order class-AB two-tone intermodulation figure is −43 dBc. Full gold metallization ensures excellent device lifetime and reliability. Additionally, 100% lot traceability is standard to meet quality control procedures. Contact the company for pricing information.

Ericsson Microelectronics, Response Management Center, LJL, First Ave., Porthill, Newcastle-under-Lyme, Staffordshire, ST5 8QX, England; +46 8 757 4700; Internet: www.ericsson.com/rfpower.

PHEMT Switches Designed For Next-Generation GSM Handsets
Models in a new family of RF switches utilize 6-in. PHEMT manufacturing technology to provide a cost-effective solution that meets the rigorous performance requirements of next-generation multiband GSM handsets.

The AWS5508 transfer switch comes with a single-pole four-throw (SP4T) and operates from a single 3-V supply. It uses its control inputs to switch between the antenna and transmitter/receiver ports to provide GSM 900-MHz, DCS 1800-MHz, and PCS 1900-MHz band selection. Also, it delivers a maximum insertion loss of 0.8 dB at 1 GHz while demonstrating 25-dB isolation.

The AWS5505, AWS5507, and AWS5512 transfer switches (TRSS) are designed for dual-band applications that require transmitter/receiver diversity. They can be used in handset designs that demand up to +45-dBm linearity. With a 0.4-dB insertion loss at 900 MHz, they also provide low power consumption and very low distortion.

These switches come housed in MSOP-10, MSOP-8, MLP-16, and SOT-26 plastic packages. They cost between $0.75 and $1.40 in 100,000-unit quantities. Samples are available now.

Anadigics, 35 Technology Dr., Warren, NJ 07059; (908) 668-5000; fax (908) 668-5132; www.anadigics.com.

Low-Jitter Limiting Amps Handle 1.25 and 2.5 Gbits/s
A new family of limiting amplifiers has been designed for Gigabit Ethernet and Fibre Channel applications. The first models in the series, the 1.25-Gbit/s MAX3264/3268, have a 14-ps deterministic jitter. This provides a 156-ps margin to the Gigabit Ethernet specifications for high-yield, robust designs. The 2.5-Gbit MAX3265/3269, meanwhile, have an 11-ps jitter. The 1.25-Gbit limiting amps provide fully limited outputs with 5-mV input signals (input sensitivity), and the 2.5-Gbit limiting amps have 10-mV sensitivity.

Each of the amplifiers operates on a single +3.0- to +5.5-V power supply. This lets the devices support both 3.3- and 5.0-V designs. The -3264/5 models come with PECL outputs, while the -3268/9 models have CML outputs. All four amplifiers feature TTL-compatible LOS outputs with a minimum 2.5-dB hysteresis to prevent chatter with low input signal levels.

The -3265/8/9 devices come in a 3-mm body, 10-pin µMAX package designed for low-cost, surface-mount applications in small modules. The

Maxim Integrated Products, 120 San Gabriel Dr., Sunnyvale, CA 94086; (408) 737-7600; www.maxim-ic.com.

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