The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I
2C°-compatible interface. Each part operates from a single 2.7 V to 5.5 V power supply and features a 1 °s conversion time.
Each AD7991/AD7995/AD7999 provides a 2-wire serial interface compatible with I
2C interfaces. The AD7991 and AD7995 come in two versions and each version has an individual I
2C address (see Table 8 of data sheet for address and part number selection). This allows two of the same devices to be connected to the same I
2C bus. Both versions support standard, fast, and high speed I
2C 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 I
2C read operation initiates a conversion and returns the result over the I
2C bus.
When four channels are used as analog inputs, the reference for the part is taken from V
DD; this allows the widest dynamic input range to the ADC. Therefore, the analog input range to the ADC is 0 V to V
DD. An external reference, applied through the V
IN3/V
REF input, can also be used with this part.
Product Highlights
- 4 single ended analog input channels, with the option ofhaving 3 single ended analog input channels and 1reference input channel.
- I2C compatible serial Interface. Standard, Fast and Hs-Modes
- Automatic shutdown.
- Reference derived from the power supply or external reference.
- 8-lead SOT23 and 8 lead MSOP Packages.
