Features and Benefits
- Tested for robustness per: IEC61000-4-2, IEC61000-4-3, IEC61000-4-4, IEC61000-4-5, IEC61000-4-6, CISPR 11
- 24-bit ADC with integrated analog front end
- Fast and flexible output rate: 1.25 SPS to 31.25 kSPS
- Channel scan data rate of 6.21 kSPS per channel (161 μs settling)
- 16 noise free bits at 1 kSPS per channel
- 85 dB rejection of 50 Hz and 60 Hz at 20 SPS per channel
- ±10 V inputs, 4 differential or 8 single-ended
- Pin absolute maximum rating ±50 V
- Absolute input pin voltage up to ±20 V
- ≥1 MΩ impedance
- ±0.06% accuracy at 25°C
- 0 mA to 20 mA inputs, 4 single-ended
- Pin absolute maximum rating ±50 mA
- Input range from −0.5 mA to +24 mA
- 60 Ω impedance
- ±0.08% accuracy at 25°C
- On-chip 2.5 V reference
- ±0.12% accuracy at 25°C, ±5 ppm/°C (typical) drift
- Internal or external clock
- Power supplies
- AVDD = 3.0 V to 5.5 V
- IOVDD = 2 V to 5.5 V
- Total IDD = 3.9 mA
- Temperature range: −40°C to +105°C
- 3-wire or 4-wire serial digital interface (Schmitt trigger on SCLK)
- SPI, QSPI, MICROWIRE, and DSP compatible
The AD4112 is a low power, low noise, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) that integrates an analog front end (AFE) for fully differential or single-ended, high impedance (≥1 MΩ) bipolar, ±10 V voltage inputs, and 0 mA to 20 mA current inputs.
The AD4112 also integrates key analog and digital signal conditioning blocks to configure eight individual setups for each analog input channel in use. The AD4112 features a maximum channel scan rate of 6.21 kSPS (161 µs) for fully settled data.
The embedded 2.5 V, low drift (5 ppm/°C), band gap internal reference (with output reference buffer) reduces the external component count.
The digital filter allows flexible settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can select between the different filter settings depending on the demands of each channel in the application. The automatic channel sequencer enables the ADC to switch through each enabled channel.
The precision performance of the AD4112 is achieved by integrating the proprietary iPassives™ technology from Analog Devices, Inc. The AD4112 is factory calibrated to achieve a high degree of specified accuracy.
The AD4112 operates with a single power supply, making it easy to use in galvanically isolated applications. The specified operating temperature range is −40°C to +105°C. The AD4112 is housed in a 40-lead, 6 mm × 6 mm LFCSP package.
- Process control
- PLC and DCS modules
- Instrumentation and measurement
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The EVAL-AD4112SDZ is a full featured evaluation board that can be used to evaluate all the features of the AD4112. The AD4112 is a 24-bit, 31.25 kSPS analog-to-digital converter (ADC) with a ±10 V input voltage range (eight single-ended channels or four fully differential channels) and four current channels operating from 0 mA to 20 mA. All channels have on-board overvoltage and overcurrent protection.
The EVAL-AD4112SDZ board includes voltage references and power and data insulation, and can be connected to the Analog Devices, Inc., SDP-B system demonstration platform (EVAL-SDP-CB1Z). The SDP-B board provides connection to a PC via a universal serial bus (USB) port and can provide power for the EVAL-AD4112SDZ board from the PC USB port.
The AD411X Eval+ evaluation software configures the AD4112 device functionality and provides dc time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.
Full specifications for the AD4112 are available in the product data sheet, which must be consulted in conjunction with this user guide when working with the EVAL-AD4112SDZ.
Software & Systems Requirements
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.
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