Overview
The AD7709ARU, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This 16-bit analog-to-digital converter (ADC) integrates multiple functionalities, including a programmable gain amplifier (PGA), selectable reference inputs, three switchable matched excitation current sources, and low-side power switches. The device is capable of accepting fully differential, unipolar, and bipolar input signal ranges, making it versatile for various measurement tasks. It operates from a single 3 V or 5 V supply and is housed in a 24-lead TSSOP package.
Key Specifications
| Parameter | Value | Unit | Test Conditions |
|---|---|---|---|
| Number of Bits | 16 | ||
| Output Update Rate | 5.4 Hz min to 105 Hz max | Hz | VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal |
| Input Range | 1.024 × REFIN/128 to 1.024 × REFIN | V | |
| Supply Voltage | 2.7 V to 3.6 V or 4.75 V to 5.25 V | V | |
| Operating Temperature | –40°C to +85°C | °C | |
| Package | 24-lead TSSOP | ||
| Power Dissipation | 3.75 mW at 3 V supply | mW | VDD = 3 V |
| Data Interface | SPI, DSP |
Key Features
- 16-bit Σ-Δ ADC with PGA, accepting fully differential, unipolar, and bipolar input signals.
- Three switchable matched excitation current sources and low-side power switches.
- Selectable reference inputs and a digital I/O port.
- Software-programmable output data rate.
- Single 3 V or 5 V supply operation.
- On-chip PLL generating the required internal operating frequency from a 32.768 kHz crystal.
- Configurable as two fully differential input channels or four pseudo-differential input channels.
Applications
The AD7709ARU is suitable for various low-frequency measurement applications, including:
- Industrial process control and monitoring.
- Medical devices requiring precise analog-to-digital conversion.
- Automotive and aerospace systems needing robust and accurate measurement solutions.
- Environmental monitoring and data acquisition systems.
Q & A
- What is the resolution of the AD7709ARU?
The AD7709ARU has a 16-bit resolution.
- What are the input signal types supported by the AD7709ARU?
The device supports fully differential, unipolar, and bipolar input signal types.
- What is the operating temperature range of the AD7709ARU?
The operating temperature range is –40°C to +85°C.
- What are the supply voltage options for the AD7709ARU?
The device can operate from a single 3 V or 5 V supply.
- What is the package type of the AD7709ARU?
The device is housed in a 24-lead TSSOP package.
- Does the AD7709ARU have built-in current sources?
Yes, it includes three switchable matched excitation current sources.
- How is the output data rate of the AD7709ARU configured?
The output data rate is software-programmable.
- What type of data interface does the AD7709ARU support?
The device supports SPI and DSP data interfaces.
- Can the AD7709ARU be used for direct conversion from transducers?
Yes, it can convert signals directly from transducers without the need for additional signal conditioning.
- What is the power dissipation of the AD7709ARU when operating at 3 V?
The power dissipation is 3.75 mW when operating at 3 V.
