2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
The AD7887 can be configured for either dual- or single-channel operation via the on-chip control register. There is a default single-channel mode that allows the AD7887 to be operated as a read-only ADC. In single-channel operation, there is one analog input (AIN0) and the AIN1/VREF pin assumes its VREF function. This VREF pin allows the user access to the part’s internal 2.5 V reference, or the VREF pin can be overdriven by an external reference to provide the reference voltage for the part. This external reference voltage has a range of 2.5 V to VDD. The analog input range on AIN0 is 0 to VREF.
In dual-channel operation, the AIN1/VREF pin assumes its AIN1 function, providing a second analog input channel. In this case, the reference voltage for the part is provided via the VDD pin. As a result, the input voltage range on both the AIN0 and AIN1 inputs is 0 to VDD.
CMOS construction ensures low power dissipation of typically 2 mW for normal operation and 3 μW in power-down mode. The part is available in an 8-lead, 0.15-inch-wide narrow body SOIC and an 8-lead MSOP package.Product Highlights
- Smallest 12-bit dual-/single-channel ADC; 8-lead MSOP package.
- Lowest power 12-bit dual-/single-channel ADC.
- Flexible power management options, including automatic power-down after conversion.
- Read-only ADC capability.
- Analog input range from 0 V to VREF.
- Versatile serial input/output port (SPI/QSPI/MICROWIRE/ DSP compatible).
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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.
The EVAL-AD7887SDZ software provides dynamic performance analysis in the form of waveform graphs, histograms, and FFT analysis for ADC performance evaluation.
On-board components include: the AD8033 and the AD8034 FastFET high speed precision rail-to-rail op amps, the ADP3303 high accuracy 200 mA low dropout linear regulator, and the AD780 2.5 V/3.0 V ultrahigh precision band gap voltage reference.
- Documents needed
- AD7887 data sheet
- EVAL-AD7887SDZ user guide
- Required software
- EVAL-AD7887SDZ evaluation software
- Design and integration files
- Schematics, layout files, bill of materials
- EVAL-AD7887SDZ evaluation board
- Evaluation software CD for the AD7887
- Mains power supply adapter
- Screw/nut kit
AD7887 Evaluation Software ZIP
AD7887 - Microcontroller No-OS Driver WIKI
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Finding the Needle in a Haystack: Measuring small differential voltages in the
(Analog Dialogue, Vol. 34, No. 1, January-February, 2000)
How to Save Power in Battery Applications Using the Power-Down Mode in an ADC
by Mercedes Casamayor and Claire Croke, Analog Devices, Inc. (Analog Dialogue, Vol. 37, 9/2003)
MS-2210: Designing Power Supplies for High Speed ADC
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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