4-Channel, 8-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23
Each AD7991/AD7995/AD7999 provides a 2-wire serial interface compatible with I2C interfaces. The AD7991 and AD7995 come in two versions and each version has an individual I2C address. This allows two of the same devices to be connected to the same I2C bus. Both versions support standard, fast, and high speed I2C interface modes. The AD7999 comes in one version.
The AD7991/AD7995/AD7999 normally remain in a shutdown state, powering up only for conversions. The conversion process is controlled by a command mode, during which each I2C read operation initiates a conversion and returns the result over the I2C bus.
When four channels are used as analog inputs, the reference for the part is taken from VDD; this allows the widest dynamic input range to the ADC. Therefore, the analog input range to the ADC is 0 V to VDD. An external reference, applied through the VIN3/VREF input, can also be used with this part.
- Four single-ended analog input channels, or three single-ended analog input channels and one reference input channel.
- I2C compatible serial Interface. Standard, Fast and Hs-Modes
- Automatic shutdown.
- Reference derived from the power supply or external reference.
- 8-lead SOT-23 Package.
- System Monitoring
- Battery Powered Systems
- Data Acquisition
- Medical Instruments
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.
Recommended External References - 2.5V
- For wide supply applications: AD780, ADR03, AD780.
- For applications requiring best accuracy, low noise, low drift: ADR421, AD780, AD780.
- For cost sensitive applications: AD1582, ADR381, ADR391.
- For low noise, high output current applications: ADR431.
- For the reference buffer amplifier: AD8605, AD8605.
- For applications requiring 2.048V to 4.096V: REF191.
Recommended Input Buffer Amplifiers
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