Electronic Design


DIN Rail-Mount Isolators Offer Protection And Configurability
The configurable multichannel isolators in the DSCL24 DIN rail-mount series provide 2300-V rms transformer isolation protection for analog signals. Their accuracy over the entire operating range is better than ±0.2%, and they have a 20-Hz bandwidth. Load resistance ranges from 0 to 600 Ù in current mode and 2000 Ù minimum in voltage mode. They're packaged in a DIN rail case that's 0.69 in. wide, supporting high-density mounting. Also, they operate between -25°C and 55°C.

The two models in the line accept universal power of 24 to 60 V ac-dc or 85 to 230 V ac-dc, respectively, with an ac range of 45 to 400 Hz. The single-channel model has four user-configurable jumpers that provide 36 different I/O settings. Its unique snap-in tool lets users quickly extract its circuit board so they can reposition the jumpers for different I/O requirements. The multichannel version is factory configurable for up to 252 different configurations of process current or voltage inputs and outputs.

Pricing starts at $226.

Dataforth Corp., 3331 East Hemisphere Loop, Tucson, AZ 85706; (520) 741-1404; fax (520) 741-0762; www.dataforth.com.

Reverse-Path Programmable-Gain Amplifier Offers 50-dB Gain Control
Operating from a single 4.75- to 5.25-V power supply, the RF3321 reverse-path programmable-gain amplifier features an output power level of 69 dBmV into a 75-Ù load. It also has a maximum voltage gain of 29 dB and a minimum voltage gain of ­20 dB. Additionally, it can provide a gain control range spanning 50 dB. It's serially programmable in 1-dB steps, and it has a frequency range of 5 to 150 MHz. Other features include DOCSIS compliance on switching transients, differential input and output, and a low-current shutdown mode.

Offered in a QSOP-16 package, the RF3321 costs $3.55 each in 10,000-unit quantities.

RF Micro Devices, 7628 Thorndike Rd., Greensboro, NC 27409-9421; (336) 664-1233; fax (336) 931-7454; www.rfmd.com.

Multifunction Audio CODEC Gives Portable Devices 16-Bit Operation
The AK4560A multifunction audio CODEC targets portable audio devices, portable Internet appliances, MP3 systems, digital video cameras, and other handheld items. Its automatic level control (ALC) circuit supports its microphone amplifier, while its speaker amplifier allows the realization of power-efficient high-quality playback. With its 2.6- to 5.5-V power-supply range, its multipower system lets designers specify optimal power for each circuit block in the device.

Several integrated features support recording. An internal multiplexer provides line-input selection. An op amp minimizes wind noise. A digital HPF is included for dc-offset cancellation. Several playback functions are featured as well, such as its digital de-emphasis filter, 2-dbV lineout buffer, mute, 0- to -50-dB analog volume control, beep, and shutter input signals. Compared to multichip solutions, its 64-pin LQFP package reduces surface area.

Engineering samples of the AK4560A are now available. It costs $7.04 in 10,000-unit quantities.

AKM Semiconductor Inc., 2001 Gateway Pl., Ste. 650W, San Jose, CA 95110; (408) 436-8580; fax (408) 436-7591; www.akm.com.

Low-Power Voltage Reference Includes Op Amp And Comparator
Designed for use in power-management circuits, the TC1026 low-power voltage reference includes an op amp and a comparator in a single 8-pin package. It has rail-to-rail outputs, allowing it to operate from low-voltage, single power supplies. Its minimum operating voltage is 1.8 V, and its active supply current is 18 µA maximum.

Pricing starts at $1.38 each in 1000-unit quantities.

Telcom Semiconductor Inc., 1300 Terra Bella Ave., Mountain View, CA 94043; (800) 888-9966, (650) 968-9241; fax (650) 967-1590; www.telcom-semi.com.

250-Msample/s ADC Fits Low-Cost, High-Performance Applications
According to its manufacturer, the SPT7721 8-bit analog-to-digital converter (ADC) costs half as much as its nearest competitor. The company also says that it has the fastest sample rate, 250 Msamples/s, with the lowest power dissipation, 310 mW, in its class. Its flexible output interface lets designers demultiplex digital outputs for parallel-aligned or interleaved data output.

Automated test equipment can use the high sample rate to accurately digitize complex analog signals. RGB video displays can take advantage of the rate, letting designers create flat-panel displays with higher resolution than ever before. Portable solid-state projectors could achieve a higher resolution projection element as well.

The SPT7721 comes in a 44-lead TQFP surface-mount package that operates between -40°C and 85°C. It costs $15 in 1000-unit batches. Samples and production quantities are both available.

Signal Processing Technologies, 4755 Forge Rd., Colorado Springs, CO 80907; (800) 643-3SPT; www.spt.com.

Driver Amplifier For Millimeter-Wave Systems Features 15-dB Gain
The AA028P2-99 is a 25- to 31-GHz broadband driver amplifier with a 15-dB gain and 16-dBm output power. Its ceramic and metal package provides environmental protection for long-term reliability. This driver amplifier is designed for use in millimeter-wave communication and sensor systems as a gain stage in the receiver, transmitter, or local oscillator chain. Also, it's used in millimeter-wave point-to-point, point-to-multipoint, and mesh wireless communications systems, including applications such as LMDS, digital radio, VSAT, and sensors.

It costs $42.50 each in 1000-unit quantities and $26.22 each in 50,000-unit quantities.

Alpha Industries Inc., 20 Sylvan Rd., Woburn, MA 01801; (781) 935-5150; fax (617) 824-4579; www.alphaind.com.

RFIC/CDMA Downconvert Mixers Complement Low-Noise Amplifiers
Designed to work with their manufacturer's low-noise amplifiers (LNAs), a companion pair of RFIC/CDMA downconvert mixers provides tri-mode operation in the 800- and 1900-MHz bands when used together. The TQ5132 RFA/mixer specifically targets cellular band, CDMA/AMPS receive applications. The TQ5633 suits PCS-band CDMA receive applications and meets the requirements of both IS-95 and AMPS standards. Both devices incorporate on-chip switches with various operational modes.

A three-state switch on the TQ5132 selects CDMA with gain steps or AMPS mode. The TQ5633 uses a two-state switch to select either a CDMA high- or low-gain mode. The PCS band unit in the TQ5633 uses a balanced mixer that allows IF operation at 110 MHz and achieves 0.5 IF rejection. The CDMA/AMPS-band unit in the TQ5132 has an IF output range of 85 to 130 MHz. Both devices include internal, RF port matching to 50 Ù and are available in SOT-23-8 packages.

Both devices cost $1.09 in 1000-unit quantities. Delivery is from stock.

Triquint Semiconductor Corp., 2300 N.E. Brookwood Pkwy., Hillsboro, OR 97124; (503) 615-9000; www.triquint.com.

SOT Op Amps Operate At 1.8 V With Bandwidths Up To 2.7 MHz
Six additions to the CMV10xx line of monolithic semiconductor SOT op amps come with low power requirements, operating on as little as a 1.8-V single supply. Their manufacturer guarantees specs at 1.8-, 2.7-, 3.0-, and 5.0-V supplies. The company also claims that these op amps offer more bandwidth than competitive devices. Their typical gain bandwidth product (GBW) and supply currents are 1.0 MHz at 50 µA, 1.66 MHz at 85 µA, or 2.7 MHz at 150 µA, depending on the device selected for the application. A sixth pin in the CMV10x6 models enables a power shutdown mode, reducing supply current to less than 1 µA at 1.8 V.

All standard devices in the series cost about $0.40 each in 10,000-unit quantities, depending upon bandwidth. Models with the shutdown feature cost $0.50 each in the same quantities, also depending on bandwidth. Production lead time is six weeks ARO.

California Micro Devices Corp., 215 Topaz St., Milpitas, CA 95035; (408) 934-3108; fax (408) 942-9505; www.calmicro.com.

500-ksample/s ADC Provides No-Missing-Codes Performance
A 16-bit, 500-ksample/s analog-to-digital converter (ADC) known as the LTC1608 offers 16-bit, no-missing-codes performance over the entire -40°C to 85°C industrial temperature range with no pipeline delay. It operates from ±5-V supplies, and it has an input range of ±2.5 V. Also, it dissipates 270 mW of power. Its 7-mW nap mode and 10-µW sleep mode reduce power even further.

An internal clock is included, as well as a 15-ppm/°C precision reference that can be externally overdriven. A parallel digital interface enables communication with a variety of DSP and microcontrollers while interfacing to 3- or 5-V logic. True differential inputs reject common-mode noise. Its ac performance includes 90-dB S/(N+D) and -100-dB THD at 500 ksamples/s.

The LTC1608 is available in a 36-pin SSOP package in both commercial and industrial temperature ranges. It's pin-compatible with the LTC1604, a 16-bit, 333-ksample/s ADC, offering an easy upgrade path. Pricing starts at $16.50 each in 1000-unit quantities.

Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035-7417; (408) 432-1900; fax (408) 434-6441; www.linear-tech.com.

Triple DACs Operate Up To 200 MHz For High-Resolution Displays
A series of triple digital-to-analog converters (DACs) offers designers of high-resolution displays a solution for high-quality analog RGB and video output. Available in 8- and 10-bit resolutions, these DACs use 100-, 150-, and 200-MHz speeds to generate higher resolution outputs. Specifically, they target systems that feature XGA, SXGA, and UXGA resolutions. They include power-down control, double-buffered digital inputs for low distortion, and an on-board bandgap voltage reference.

Customers can order an evaluation board to simplify bench testing. The basic unit—the 8-bit, 100-MHz FMS3810KRC—costs $6.20 per 1000 units. The top end of the series—the 10-bit, 200-MHz FMS3120KRC—costs $9.85 in 1000-unit quantities.

Fairchild Semiconductor, 1322 Crossman Ave., Sunnyvale, CA 94089; (408) 822-2000; www.fairchildsemi.com.

Dual-Band HBT Power Amplifiers Target GSM/DCS Wireless Handsets
A family of dual-band HBT power amplifiers are designed for use in GSM/DCS wireless handsets. They're manufactured using a 6-in. analog GaAs fabrication process. These InGaP HBT power amps also let handsets achieve longer battery life and better signal characteristics via sound power management.

Samples of the power amps are currently available. Contact the company for pricing information.

Anadigics Inc., 35 Technology Dr., Warren, NJ 07059; (908) 668-5000; fax (908) 668-5068; www.anadigics.com.

Two 2SK3018 Transistors Reside in 2- By 2.1-mm SOT-363 Package
Requiring only a 2.4-V drive, the UM5K1N and UM6K1N compact MOSFET devices combine two 2SK3018 transistors in a single 2- by 2.1-mm SOT-363 package. These transistors are suited for handheld equipment, such as PDAs, cell phones, and portable terminals. They're totally independent in the 6-pin UMK61N, while those in the 5-pin UMK51N have a common source pin. Both devices have a static drain-source on-stage resistance of 5 Ù typical and 8 Ù maximum at 4 V and 10 mA, and 7 Ù typical and 13 Ù maximum at 2.5 V and 1 mA. A protection diode is built in between the source and gate to protect against ESD.

Contact the company for pricing and availability information.

Rohm Electronics, Antioch, TN; (615) 641-2020; www.rohmelectronics.com.

2.4-GHz, 100-mW Power Amplifier Suits Bluetooth Class 1 Radios
Designed specifically for Bluetooth Class 1 radios, the MAX2240 2.4-GHz, 100-mW power amplifier occupies just 2.43 mm2 of board space. Its 20 dBm of output power lets users extend the radio link range to 100 m, suitable for Bluetooth devices operating in changing environments such as notebook PCs, cell phones, and access points. The chip also can be used for HomeRF, 802.11 FHSS, and other 2.4-GHz proprietary ISM-band radio applications.

It features a digital power-control function, allowing the user to reduce the transmit power in 6-dB steps down to 4 dBm or less, complying with Bluetooth Power Class 1 specifications. The device also features an integrated 50-Ù matching impedance, further reducing components and required board space. It operates on a single 2.7- to 5-V supply and draws only 105 mA of current.

Pricing starts at $1.75 each in 1000-unit quantities.

Maxim Integrated Products, 120 San Gabriel Dr., Sunnyvale, CA 94086; (800) 998-8800, (408) 737-7600; fax (408) 737-7194; www.maxim-ic.com.

Dual Op Amp Provides 500-mA Output With A 10-V p-p Output Swing
Designed specifically for DSL driver applications, the OPA2677 dual operational amplifier delivers a 500-mA output with a 10-V p-p output swing. Operating on a single 12-V supply, the device consumes 9 mA of quiescent current per channel. Other features include a 200-MHz bandwidth, logic-controlled power settings, and a slew rate of 1800 V/µs.

Available in an SO-8 package, pricing starts at $2.29 each per 1000 units.

Burr-Brown Corp., P.O. Box 11400, Tucson, AZ 85734; (800) 548-6132; Internet: www.burr-brown.com.

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