Overview
The AD7721AR is a 16-bit sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed for low power consumption and high performance, making it suitable for a variety of applications requiring precise analog-to-digital conversion. The AD7721AR operates from a single +5V supply and features a differential analog input range of 0 V to 2.5 V or ±1.25 V. It incorporates a sigma-delta modulator and two finite impulse response (FIR) digital filters, which reduce the need for external anti-alias filtering. The device also includes a high-speed serial interface and supports both parallel and serial modes of operation.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Resolution | 12-bit / 16-bit | |
| Output Word Rate (OWR) | 468.75 kHz | |
| Input Bandwidth | Up to 229.2 kHz | |
| Supply Voltage | +5 V ± 5% | V |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | 28-SOIC | |
| Power Consumption (Standby) | 70 µW | µW |
| Interface Modes | Parallel, SPI, Serial | |
| Maximum Clock Frequency (Serial Mode) | 15 MHz | MHz |
| Maximum Clock Frequency (Parallel Mode) | 10 MHz | MHz |
Key Features
- 16-bit sigma-delta ADC with no missing codes
- High-speed serial interface with linear phase response
- Low-pass digital filter reducing external anti-alias requirements
- Low power consumption with a standby mode of 70 µW
- CMOS construction ensuring low power dissipation
- Support for both bipolar and unipolar input signals
- On-chip filtering and analog modulator eliminating the need for external sample-and-hold circuitry
Applications
The AD7721AR is versatile and can be used in various applications, including:
- Data acquisition systems
- Industrial control systems
- Medical devices requiring precise analog-to-digital conversion
- Aerospace and defense systems where low power and high accuracy are critical
- Automotive systems for sensor data acquisition
Q & A
- What is the resolution of the AD7721AR ADC?
The AD7721AR has a resolution of 12-bit or 16-bit.
- What is the output word rate of the AD7721AR?
The output word rate is 468.75 kHz.
- What is the input bandwidth of the AD7721AR?
The input bandwidth is up to 229.2 kHz.
- What is the supply voltage for the AD7721AR?
The supply voltage is +5 V ± 5%.
- What are the operating temperature ranges for the AD7721AR?
The operating temperature range is -40°C to +85°C.
- What package type is the AD7721AR available in?
The AD7721AR is available in a 28-SOIC package.
- How much power does the AD7721AR consume in standby mode?
The power consumption in standby mode is 70 µW.
- What interface modes does the AD7721AR support?
The AD7721AR supports parallel, SPI, and serial interface modes.
- What is the maximum clock frequency for the serial mode of the AD7721AR?
The maximum clock frequency for the serial mode is 15 MHz.
- What is the maximum clock frequency for the parallel mode of the AD7721AR?
The maximum clock frequency for the parallel mode is 10 MHz.
