Overview
The AD7705BRU is a 16-bit, 2-channel sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed as a complete analog front end for low-frequency measurement applications. It features two fully differential analog input channels and a differential reference input, making it suitable for direct connection to transducers and other low-level signal sources. The AD7705BRU operates from a single supply voltage of 2.7 V to 3.3 V or 4.75 V to 5.25 V and is available in a 16-lead TSSOP package.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Model | AD7705BRU |
| Number of Channels | 2 |
| Number of Bits | 16 |
| Input Type | Fully Differential |
| Supply Voltage | 2.7 V to 3.3 V, 4.75 V to 5.25 V |
| Package Type | 16-Lead TSSOP |
| Operating Temperature | -40°C to +85°C |
| Sampling Rate | Up to 500 samples per second |
| Power Dissipation | 1 mW maximum @ 3 V |
| Standby Current | 8 μA maximum |
| Interface | SPI, QSPI, MICROWIRE, DSP-compatible |
| Gain Range | 1 to 128 |
Key Features
- Programmable Gain Front End: Allows gains from 1 to 128, enabling the device to handle a wide range of input signal levels.
- Sigma-Delta Conversion: Employs a sigma-delta conversion technique to achieve up to 16 bits of no missing codes performance.
- Low Power Consumption: Consumes less than 1 mW at 3 V supply and has a standby current of less than 8 μA.
- Self-Calibration and System Calibration: Options to eliminate gain and offset errors on the part itself or in the system.
- Serial Interface: Configurable for 3-wire operation, compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
- Analog Input Buffering: Ability to buffer the analog input, enhancing signal integrity.
Applications
The AD7705BRU is ideal for use in various applications, including:
- Smart Systems: Suitable for integration into smart systems due to its low power consumption and high accuracy.
- Microcontroller and DSP-Based Systems: Compatible with microcontrollers and DSP processors, making it a versatile choice for a wide range of digital systems.
- Low Frequency Measurement Applications: Designed to handle low-level input signals directly from transducers, making it suitable for industrial, medical, and other measurement applications.
Q & A
- What is the AD7705BRU?
The AD7705BRU is a 16-bit, 2-channel sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc.
- What are the supply voltage options for the AD7705BRU?
The device operates from a single supply voltage of 2.7 V to 3.3 V or 4.75 V to 5.25 V.
- What type of input channels does the AD7705BRU have?
The AD7705BRU features two fully differential analog input channels.
- What is the maximum sampling rate of the AD7705BRU?
The maximum sampling rate is up to 500 samples per second.
- What is the power dissipation of the AD7705BRU at 3 V supply?
The power dissipation is less than 1 mW at 3 V supply.
- What types of interfaces are supported by the AD7705BRU?
The device supports SPI, QSPI, MICROWIRE, and DSP-compatible interfaces.
- Does the AD7705BRU have self-calibration options?
Yes, the device has self-calibration and system calibration options to eliminate gain and offset errors.
- What is the operating temperature range of the AD7705BRU?
The operating temperature range is -40°C to +85°C.
- What is the standby current of the AD7705BRU?
The standby current is less than 8 μA.
- In what package is the AD7705BRU available?
The device is available in a 16-lead TSSOP package.
