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Industry News / RFIC Channel

ADI’s 24-bit sigma-delta A/D converter achieves twice the speed of competing converters

December 4, 2012
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Analog Devices Inc. (ADI) introduced a multiplexed 24-bit sigma-delta A/D converter that doubles the throughput rate of alternative sigma-delta converters while dissipating less power. Designed for process automation and instrumentation systems where data channel density is increasing and channels must be monitored faster, ADI’s new AD7176-2 A/D converter achieves a 50 kSPS (thousand samples per second) multi-channel scan rate. In an automated, high-precision production line, the performance of the AD7176-2 allows for faster manufacturing while achieving the precision, low-input bandwidth signal measurements that are inherently associated with the sigma-delta architecture. Measured on a single channel, the AD7176-2 delivers as many as 17.2 noise-free bits at 250 kSPS and 22 noise-free bits at 5 SPS.

The AD7176-2 A/D converter includes high-precision, on-chip peripherals, including a 2.5 V, ±2.5 ppm/°C reference and ±2.5% internal oscillator that reduce board space and lower bill of materials costs while maintaining high performance. The new converter features flexible on-chip digital filters, which optimize settling, resolution and line frequency rejection. The new converter also can be configured on a per-channel basis allowing for different filter and output data rates as well as per-channel offset and gain error correction.

AD7176-2 24-bit Sigma-Delta A/D Converter Key Features:

  • 5 SPS to 250 kSPS output rate for fast and flexible updates
  • 17.2 noise free bits at 250 kSPS for more accurate measurements
  • Up to 90 dB 50 Hz and 60 Hz line frequency rejection using enhanced 50 Hz and 60 Hz rejection filters
  • 7.8 mA total current consumption

Pricing, Availability and Complementary Products

Product

 

 

Sample
Availability

 

 

Channel
Configuration

 

 

Reference

 

 

Price Each In
1,000
Quantities

 

 

Package

AD7176-2

 

 

Yes

 

 

4 pseudo/2 full
differential

 

 

2.5 V
±2 ppm/°C

 

 

$10.25

 

 

24-lead
TSSOP

The AD7176-2 can be designed into circuits together with ADI’s single-supply, low-noise, low-offset AD8656 CMOS amplifier and single supply, attenuating input stage, AD8475 differential driver.  

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