Overview
The AD7984BRMZ 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 device samples the voltage difference between the IN+ and IN− pins on the rising edge of the CNV input and supports an externally applied reference voltage, REF, which can be set independently of the supply voltage. The AD7984 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using a separate VIO supply and does not exhibit any pipeline delay or latency, making it ideal for multiple multiplexed channel applications.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 18 bits |
| Sampling Rate | 1.33 MSPS |
| Power Supply | Single supply, 2.9V to 5V |
| Logic Compatibility | 1.8 V, 2.5 V, 3 V, 5 V |
| Package | 10-Lead MSOP, 10-Lead LFCSP |
| Operating Temperature Range | −40°C to +85°C |
| Power Consumption | 10.5 mW |
| Interface | SPI-compatible serial interface |
| Reference Voltage | Externally applied, independent of VDD |
Key Features
- Successive approximation ADC with charge redistribution DAC
- Low power consumption of 10.5 mW
- High speed sampling at 1.33 MSPS
- SPI-compatible serial interface with daisy-chain capability and optional busy indicator
- Compatible with various logic levels (1.8 V, 2.5 V, 3 V, 5 V) using separate VIO supply
- No pipeline delay or latency, ideal for multiplexed channel applications
- Available in compact 10-lead MSOP and LFCSP packages
Applications
The AD7984 is suitable for a variety of applications that require high precision and low power consumption. These include:
- Multiplexed channel systems where multiple ADCs need to be interfaced on a single bus
- Industrial control systems requiring precise analog-to-digital conversion
- Medical devices that demand low power and high accuracy
- Data acquisition systems in scientific and research environments
- Automotive and aerospace applications where reliability and precision are critical
Q & A
- What is the resolution of the AD7984 ADC?
The AD7984 has an 18-bit resolution. - What is the sampling rate of the AD7984?
The sampling rate of the AD7984 is 1.33 MSPS. - What are the supported power supply voltages for the AD7984?
The AD7984 operates from a single power supply ranging from 2.9V to 5V. - Is the AD7984 compatible with different logic levels?
Yes, the AD7984 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using a separate VIO supply. - What types of packages are available for the AD7984?
The AD7984 is available in 10-lead MSOP and 10-lead LFCSP packages. - What is the operating temperature range of the AD7984?
The operating temperature range of the AD7984 is −40°C to +85°C. - Does the AD7984 have any pipeline delay or latency?
No, the AD7984 does not exhibit any pipeline delay or latency. - How does the AD7984 support multiple ADCs on a single bus?
The AD7984 supports daisy-chaining of multiple ADCs on a single 3-wire bus using the SPI-compatible serial interface. - What is the power consumption of the AD7984?
The power consumption of the AD7984 is 10.5 mW. - Is there an evaluation kit available for the AD7984?
Yes, there are evaluation kits available, such as the EVAL-AD7984SDZ, which allows detailed analysis of the ADC's performance.
