Overview
The AD7709BRU, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This 16-bit sigma-delta analog-to-digital converter (ADC) features a versatile set of functionalities, including a programmable gain amplifier (PGA), switchable current sources, and low-side power switches. It supports fully differential, unipolar, and bipolar input signal ranges, making it suitable for direct conversion of signals from transducers without additional signal conditioning. The device operates from a single 3 V or 5 V supply and is housed in a 24-lead TSSOP package, ensuring compact and efficient integration into various systems.
Key Specifications
| Parameter | Value | Unit | Test Conditions |
|---|---|---|---|
| Number of Bits | 16 | - | - |
| Sampling Rate | 5.4 Hz to 105 Hz | Hz | - |
| Number of Inputs | 2, 4 | - | - |
| Input Type | Differential, Pseudo-Differential | - | - |
| Polarity | Bipolar | - | - |
| Data Interface | SPI | - | - |
| Supply Voltage | 2.7 V to 3.6 V, 4.75 V to 5.25 V | V | - |
| Operating Temperature | -40°C to +85°C | °C | - |
| Package / Case | 24-TSSOP (0.173, 4.40mm Width) | - | - |
| Power Dissipation (at 3 V) | 3.75 mW | mW | - |
Key Features
- 16-bit Sigma-Delta ADC: Provides high resolution and accuracy for low-frequency measurements.
- Programmable Gain Amplifier (PGA): Supports various input signal ranges from 1.024 × REFIN/128 to 1.024 × REFIN.
- Switchable Current Sources: Includes three matched excitation current sources for transducer excitation.
- Low-Side Power Switches: Enables control over external devices.
- Digital I/O Port: Facilitates communication and control through an SPI interface.
- Single Supply Operation: Can operate from a single 3 V or 5 V supply.
- Compact Package: Housed in a 24-lead TSSOP package for efficient integration.
Applications
- Industrial Automation: Suitable for measuring low-frequency signals in industrial control systems.
- Medical Devices: Used in medical equipment for precise measurement of physiological signals.
- Test and Measurement: Ideal for data acquisition systems requiring high accuracy and low noise.
- Process Control: Employed in process control systems to measure various physical parameters.
- Aerospace and Defense: Used in applications requiring high reliability and precision.
Q & A
- What is the resolution of the AD7709BRU?
The AD7709BRU has a 16-bit resolution.
- What are the supported input signal types?
The device supports fully differential, unipolar, and bipolar input signal ranges.
- What is the sampling rate range of the AD7709BRU?
The sampling rate ranges from 5.4 Hz to 105 Hz.
- What type of data interface does the AD7709BRU use?
The device uses an SPI (Serial Peripheral Interface) for data communication.
- What is the operating supply voltage range for the AD7709BRU?
The device operates from a single supply voltage of 2.7 V to 3.6 V or 4.75 V to 5.25 V.
- What is the package type of the AD7709BRU?
The device is housed in a 24-lead TSSOP package.
- What are the key features of the AD7709BRU's analog front end?
The device includes a PGA, switchable current sources, low-side power switches, and a digital I/O port.
- How does the AD7709BRU handle transducer excitation?
The device includes three matched excitation current sources for transducer excitation.
- What is the power dissipation of the AD7709BRU when operating at 3 V?
The power dissipation is 3.75 mW when operating at 3 V.
- What are some common applications of the AD7709BRU?
Common applications include industrial automation, medical devices, test and measurement, process control, and aerospace and defense.
