TI’s ADS5281 Family, Low Power Octal ADCs - Texas Instruments

Texas Instruments (TI) introduced ADS5281 family, a series of 10- and 12-bit octal ADCs (Analog-to-Digital Converters). The new  ADCs offers low power consumption (64 mW per channel), sampling speeds  up to 65 MSPS (Million Samples Per Second), low noise performance and advanced digital features. The ADS5281 ADC family enable smaller and more energy-efficient wireless communications, medical imaging, military guidance, video equipments, and automatic test equipments.

Key features of ADS5281 octal ADCs:

• Lowest power: 64 mW per channel
• 70 dBFS SNR, 85 dBc SFDR at 10MHz IF
• Up to 6 dB overload recovery in one clock cycle
• Programmable features:
  • 1/f noise suppression mode
  • 0 to 12 dB gain in 1 dB steps
• Serialized LVDS outputs with programmable current
• ADS5281 also available in 80-pin TQFP; pin-compatible to TI’s ADS5271

The ADS5281 family is designed to interface with TI’s new octal variable gain amplifier, the VCA8500, which features 0.8 nv/square root Hz input noise at only 63 mW per channel power consumption. When combined, the ADC and octal amplifier offer a complete medical signal chain solution with better noise performance and a combined power of less than 130 mW per channel at 50 MSPS, less than any competing solution on the market today.

The ADS5281 devices and VCA8500 come in the industry’s smallest 64-pin 9 x 9 mm QFN package, a space savings that is essential for high-density systems. Connecting the amplifier to the ADC does not require additional components, and implementing the combined solution requires the same footprint as any comparable integrated device.

The ADS5281 family also includes an array of features to enhance performance. A low-frequency noise suppression mode eliminates the 1/f (Flicker) noise, improving SNR by up to 4.2 dB over a 1-MHz band in baseband and time-domain applications. Overload recovery circuitry allows each ADC to provide valid data within one clock cycle after an input overload as high as 6 dB, allowing for immediate signal recovery and processing. And with programmable gain from 0 to 12 dB, full-scale outputs can be provided for input signals as low as 0.5 Volts peak to peak (Vpp).

Easy-to-use evaluation modules (EVMs), deserializer and capture cards available from TI allow fast and cost-effective evaluation to help customers speed the design process and penetrate the market quickly. To further simplify design, TI offers a wide variety of parts to complete the signal chain. Aside from the VCA8500 for medical imaging, TI offers signal chain solutions for wireless communications systems including the DAC5672A, TRF3710, TRF3703, GC5016 and THS45xx family of amplifiers, as well as TI’s family of single- and multi-core wireless infrastructure-optimized digital signal processors (DSPs).

Key Applications of ADS5281 octal ADCs:

• Wireless communication:
  • Diversity, MIMO receivers
  • Software-defined radios
• Medical imaging:
  • Ultrasound
  • MRI
  • PET
• Industrial imaging
• Multi-channel data acquisition

The ADS5281 family of ADCs is available in 64-pin QFN package (9 x 9 mm) and 80-pin TQFP package (compatible with TI’s ADS527x family of octal ADCs).

More info: ADS5281 Low Power Octal ADCs - Texas Instruments