Overview
The AD7982BCPZ-RL is an 18-bit, successive approximation, analog-to-digital converter (ADC) produced by Analog Devices Inc. This ADC operates from a single power supply, VDD, and features a low power, high speed, 18-bit sampling ADC along with a versatile serial interface port. The AD7982 samples the voltage difference between the IN+ and IN− pins on the rising edge of the CNV signal, with the voltages on these pins typically swinging in opposite phases between 0 V and VREF. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. The device is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using a separate VIO supply.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 18 bits | |
| Sampling Rate | 1 MSPS | |
| Power Supply (VDD) | 2.375 to 2.625 | V |
| Power Supply (VIO) | 1.71 to 5.5 | V |
| Operating Temperature | −40 to +85 | °C |
| Package | 10-Lead MSOP or 10-Lead LFCSP | |
| Input Impedance | See the Analog Inputs section | |
| Differential Linearity Error (DNL) | −0.85 to +1.5 LSB | |
| Integral Linearity Error (INL) | −2 to +2 LSB | |
| Gain Error | −0.023 to +0.004 % of FS | |
| Zero Error | ±100 to +700 μV | |
| Power Dissipation (1 MSPS throughput) | 7 to 8.6 mW | |
| Energy per Conversion | 7.0 nJ/sample |
Key Features
- Low power, high speed 18-bit sampling ADC
- Successive approximation conversion technique
- External reference voltage (VREF) independent of supply voltage (VDD)
- SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface
- Ability to daisy-chain multiple ADCs on a single 3-wire bus
- Optional busy indicator
- Compatibility with 1.8 V, 2.5 V, 3 V, and 5 V logic using separate VIO supply
- Wide operating temperature range: −40°C to +85°C
Applications
- Automated test equipment
- Data acquisition systems
- Medical instruments
- Machine automation
Q & A
- What is the resolution of the AD7982 ADC?
The AD7982 has an 18-bit resolution.
- What is the maximum sampling rate of the AD7982?
The AD7982 can sample at up to 1 MSPS.
- What are the power supply requirements for the AD7982?
The AD7982 operates from a single power supply, VDD, which can range from 2.375 V to 2.625 V, and a separate VIO supply ranging from 1.71 V to 5.5 V.
- What is the operating temperature range of the AD7982?
The AD7982 operates over a temperature range of −40°C to +85°C.
- What types of packages are available for the AD7982?
The AD7982 is available in 10-Lead MSOP and 10-Lead LFCSP packages.
- Can the AD7982 be daisy-chained with other ADCs?
Yes, the AD7982 can be daisy-chained with other ADCs on a single 3-wire bus using the SPI-compatible serial interface.
- What are some common applications of the AD7982?
The AD7982 is commonly used in automated test equipment, data acquisition systems, medical instruments, and machine automation.
- How much power does the AD7982 consume at 1 MSPS throughput?
The AD7982 consumes approximately 7 to 8.6 mW of power at 1 MSPS throughput.
- What is the energy per conversion for the AD7982?
The energy per conversion for the AD7982 is 7.0 nJ/sample.
- Is the AD7982 compatible with different logic levels?
Yes, the AD7982 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using a separate VIO supply.
