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AD7194
8-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA
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Overview
Features and Benefits
- Fast settling filter option
- 8 differential/16 pseudo differential input channels
- RMS noise: 11 nV at 4.7 Hz (gain = 128)
- 15.5 noise-free bits at 2.4 kHz (gain = 128)
- Up to 22 noise-free bits (gain = 1)
- Offset drift: ±5 nV/°C
- Gain drift: ±1 ppm/°C
- Programmable gain (1 to 128)
- Output data rate: 4.7 Hz to 4.8 kHz
- Internal or external clock
- Simultaneous 50 Hz/60 Hz rejection
- 4 general-purpose digital outputs
- Power supply
- AVDD: 3 V to 5.25 V
- DVDD: 2.7 V to 5.25 V
- Current: 4.65 mA
- Temperature range: −40°C to +105°C
- Package: 32-lead LFCSP
- Interface
- 3-wire serial
- SPI, QSPI™, MICROWIRE™, and DSP compatible
- Schmitt trigger on SCLK
Product Details
The AD7194 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC.
The device can be configured to have eight differential inputs or sixteen pseudo differential inputs. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz.
The device has a very flexible digital filter, including a fast settling option. Variables such as output data rate and settling time are dependent on the option selected. For applications that require all conversions to be settled, the AD7194 includes zero latency.
The part operates with a power supply from 3 V to 5.25 V. It consumes a current of 4.65 mA, and it is housed in a 32-lead LFCSP package.
Applications
- PLC/DCS analog input modules
- Data acquisition
- Strain gage transducers
- Pressure measurement
- Temperature measurement
- Flow measurement
- Weigh scales
- Chromatography
- Medical and scientific instrumentation
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation
Frequently Asked Questions (1)
Tools & Simulations
Virtual Eval - BETA
Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.
Design Tools
These tools show the response of the digital filter section of the AD71xx and AD77xx devices based on input parameters.
Reference Materials
Digital Filters Sinc3 V's Sinc4 Differences and Trade Offs
Precision Sigma Delta Filtering Tutorial
Virtual Evaluation (VE) Tutorial
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Support & Discussions
AD7194 Discussions
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.