Microwave Journal
www.microwavejournal.com/articles/23343-ad-sigma-delta-converter-ad7175-2

A/D Sigma-Delta Converter: AD7175-2

November 11, 2014

4-Bit Sigma Delta AD ConverterAnalog Devices, Inc. (NASDAQ: ADI) introduced today the industry’s first sigma-delta converter with a fully integrated true rail-to-rail input buffer providing system designers with the industry’s leading noise performance at up to 250 kSPS throughput.

The AD7175-2 A/D sigma-delta converter delivers 24 noise-free bits at 20 SPS and 17.2 noise-free bits at 250 kSPS providing designers a wider dynamic range, which enables smaller signal deviations to be measured as required within analytical laboratory instrumentation systems. With twice the throughput for the same power consumption versus competing solutions, the AD7175-2 enables faster, more responsive measurement systems providing a 50-kSPS/channel scan rate with 20 micro second settling time. This combination makes it an ideal choice for use in programmable-logic controller and distributed-control-system input modules.

The integrated, low-noise, true rail-to-rail input buffer enables quick and easy sensor interfacing, reduces design and layout complexity, simplifies analog drive circuitry and reduces PCB area. The AD717x family, with a wide range of pin and software compatible devices, allows consolidation and standardization across system platforms.

AD7175-2 A/D Converter Features

  • User-configurable input channels
    • 2 differential or 4 single-ended channels
    • Per-channel independent programmability
  • Integrated 2.5-V buffered 2-ppm/°C reference
  • Flexible and per-channel programmable digital filters
  • Enhanced filters for simultaneous 50-Hz and 60-Hz rejection
  • −40°C to +105°Operating Temperature Range

Pricing, Availability and Complementary Components

Product

 

 

Production
Availability

 

 

Option

 

 

Packaging

 

 

Price Each In 1,000
Quantities

AD7175-2

 

 

NOW

 

 

250 ksps, 2/4 Ch
Mux, Buffered I/P,
5V

 

 

24-lead TSSOP

 

 

$11.85

AD7172-2

 

 

SAMPLING

 

 

31 ksps, 2/4 Ch
Mux, Buffered I/P,
3V/5V

 

 

24-lead TSSOP

 

 

$7.45

AD7176-2

 

 

NOW

 

 

250 ksps, 2/4 Ch
Mux, Un-Buffered,
5V

 

 

24-lead TSSOP

 

 

$10.25

AD7172-4

 

 

SAMPLING

 

 

31 ksps, 4/8 Ch
Mux, Buffered I/P,
3V/5V

 

 

32-lead LFCSP

 

 

$7.85

AD7175-8

 

 

SAMPLING

 

 

250 ksps, 8/16 Ch
Mux, Buffered I/P,
5V

 

 

40-lead LFCSP

 

 

$12.80

AD7173-8

 

 

NOW

 

 

31 ksps, 8/16 Ch
Mux, Buffered I/P,
3V/5V

 

 

40-lead LFCSP

 

 

$8.30

Complementary Components

Complementary components to the AD7175-2 for designing signal chains include the ADA4528-2 ultra-low-noise, zero-drift operational amplifier, the AD8429 low-noise instrumentation amplifier and the AD8475 precision, fully-differential funnel amplifier.

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