Overview
The AD7721ARZ-REEL, produced by Analog Devices Inc., is a complete low-power, 12-/16-bit sigma-delta analog-to-digital converter (ADC). This component operates from a +5 V supply and accepts differential inputs ranging from 0 V to 2.5 V or ±1.25 V. The AD7721 is designed to eliminate the need for external sample-and-hold circuitry by continuously sampling the analog input at twice the clock frequency. It features on-chip filtering, which reduces the external antialias requirements to first order in most cases. The device is known for its excellent linearity and DC accuracy, ensured by a single-bit DAC in the modulator and on-chip calibration of offset and gain.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12-/16-bit |
| Supply Voltage | +5 V |
| Analog Input Range | 0 V to 2.5 V or ±1.25 V |
| Maximum Clock Frequency | 10 MHz (parallel mode), 15 MHz (serial mode) |
| Output Word Rate | Up to 468.75 kHz |
| Settling Time | 218.4 µs |
| Group Delay | 109.2 µs (at 15 MHz clock frequency) |
| Interface Type | Parallel, SPI, Serial |
| Package Type | 28-Lead SOIC (Wide) |
Key Features
- Low power consumption, making it suitable for battery-powered applications.
- On-chip calibration of offset and gain ensures high accuracy and linearity.
- Continuous sampling of the analog input at twice the clock frequency, eliminating the need for external sample-and-hold circuitry.
- On-chip filtering reduces external antialias requirements to first order in most cases.
- High-speed interfacing through parallel, SPI, or serial ports, facilitating easy connection to modern microcontrollers and digital signal processors.
- Excellent linearity and DC accuracy due to the use of a single-bit DAC in the modulator.
Applications
- Industrial process control and automation.
- Medical devices requiring high precision and low power consumption.
- Aerospace and defense systems where reliability and accuracy are critical.
- Automotive systems, including sensor interfaces and data acquisition.
- Test and measurement equipment where high resolution and accuracy are necessary.
Q & A
- What is the resolution of the AD7721ARZ-REEL ADC?
The AD7721ARZ-REEL is available in 12-bit and 16-bit resolutions.
- What is the supply voltage for the AD7721ARZ-REEL?
The AD7721ARZ-REEL operates from a +5 V supply.
- What is the range of the analog input for the AD7721ARZ-REEL?
The analog input range is from 0 V to 2.5 V or ±1.25 V.
- What are the maximum clock frequencies for the AD7721ARZ-REEL?
The maximum clock frequencies are 10 MHz in parallel mode and 15 MHz in serial mode.
- What is the output word rate of the AD7721ARZ-REEL?
The output word rate can be up to 468.75 kHz.
- How long is the settling time for the AD7721ARZ-REEL?
The settling time is 218.4 µs.
- What is the group delay for the AD7721ARZ-REEL at a 15 MHz clock frequency?
The group delay is 109.2 µs at a 15 MHz clock frequency.
- What types of interfaces does the AD7721ARZ-REEL support?
The AD7721ARZ-REEL supports parallel, SPI, and serial interfaces.
- What is the package type for the AD7721ARZ-REEL?
The package type is a 28-Lead SOIC (Wide).
- Why is on-chip calibration important for the AD7721ARZ-REEL?
On-chip calibration ensures high accuracy and linearity by minimizing zero-scale and full-scale errors.
