Electronic Design


12-Bit, 65-Msample/s ADC Enables IF-Sampling Architectures
The AD9226 12-bit, 65-Msample/s analog-to-digital converter (ADC) enables direct IF-sampling architectures for communications applications. These include next-generation cellular basestation and software radio applications. Operating from a single 5-V supply, this device dissipates 475 mW of power.

Additional features of the ADC include a 750-MHz full-power input bandwidth and an on-chip sample/ hold amplifier. Also, a clock duty cycle stabilizer and an out-of-range indicator are offered. The AD9226 boasts an operating-temperature range of −40°C to 85°C.

The AD9226 is pin-compatible with all family AD922X products. Packaging options include a 28-lead shrink small outline or a 48-lead LQFP.

In 1000-unit quantities, the AD9226 costs $18.55 each.

Analog Devices Inc., Ray Stata Technology Center, 804 Woburn St., Wilmington, MA 01877; (800) ANALOGD; fax (781) 937-1021; www.analog.com.

DAC Module Uses 33-MHz, 14-Bit Multichannel Interface
The HEGD14 digital-to-analog converter (DAC) module uses a 33-MHz,14-bit, multichannel digital-to-analog interface. This interface accepts high-bandwidth DMA datastreams from connected TMS320C6000-based DSP system hardware.

This module can be combined with processor modules to create fully integrated signal-processing systems. Through various combinations of these resources, PCI-based systems can be optimized for use in radar, sonar, imaging, and communications applications. The device provides a high-speed digital-to-analog interface with eight 14-bit analog output channels. It offers a sampling-rate range of 4 to 33 MHz for eight-channel down to single-channel operation.

The HEGD14 complements the previous devices in this series: the eight-channel, 2.5-MHz, 16-bit HEGD12; the 12-channel, 33-MHz, 12-bit HEGD11; and the four-channel, 33-MHz, 12-bit HEGD9. The 4- by 2.5-in. dimensions of these modules enable them to fit directly into the slots of HERON carrier boards. Embedded logic automatically streams data across a FIFO-based connection to the TMS320C6000 DSP processor hardware.

Available now, the HEGD14 can be added to an existing HERON DSP hardware configuration for $2150.

Traquair, 114 Sheldon Rd., Ithaca, NY 14850; (607) 266-6000; fax (607) 266-8221; www.traquair.com.

Dual/Quad Zero-Drift Op Amps Provide Accuracy In Small Packages
The LTC2051 dual and LTC2052 quad low-cost, zero-drift amplifiers are housed in small MSOP-8 and SSOP-16 packages. With a maximum input offset voltage of 3 µV, these dc-accurate op amps have an offset drift of only 30 nV/°C. The devices have a 75-pA input bias current. CMRR and PSRR in excess of 130- and 140-dB large-signal gain are also featured.

These op amps offer a wide gain bandwidth of 3 MHz and a slew rate of 2 V/µs. Also, a low dc to 10-Hz noise of 1.5 µV p-p is provided. Capable of operation from a single 3-V/5-V and ±5-V power supply, the devices draw 750 µA per channel. The op amps have rail-to-rail output voltage swing and a wide input common-mode range that includes ground. Both devices have a guaranteed operating-temperature range of −40°C to 85°C.

The LTC2051 dual is available in both MSOP-8 and SO-8 packages. Options for the LTC2052 quad include the 16-pin SSOP and 14-pin SO packages. According to the company, these op amps are suited for use with a range of sensors from thermocouples to airflow meters, pressure sensors, and any variety of wheatstone bridge sensors.

Available now, the LTC2051 dual and LTC2052 quad cost $2.20 and $3.65 each, respectively, 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.

20-Bit Stereo Codec With Small Footprint Consumes Only 25 mW
The AK4551 2.5-V 20-bit stereo codec consumes only 25 mW of power. According to the company, the device's 16-pin TSSOP package provides the industry's smallest footprint for a stereo codec.

The device includes an analog-to-digital converter (ADC) with a dynamic range of 89 dB and a digital-to-analog converter (DAC) with a dynamic range of 92 dB. Both converters operate from a 2.5-V power supply. Single-ended inputs and outputs reduce the need
for external components. On-chip switched-capacitor post filters provide high jitter tolerance. Also, the device uses a built-in high-pass filter (at 3.4-Hz fc) to cancel dc offset.

In 10,000-unit quantities, the AK4551 costs $2.53.

AKM Semiconductor Inc., 2001 Gateway Pl., Ste. 650W, San Jose, CA 95110; (888) 256-7364; fax (408) 436-7591; www.akm.com.

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