Overview
The AD7705BNZ, manufactured by Analog Devices Inc., is a precision 16-bit Sigma-Delta Analog-to-Digital Converter (ADC) designed for low-frequency measurement applications. This device is part of the AD7705/AD7706 family, which serves as a complete analog front end for various measurement systems. The AD7705BNZ features two fully differential analog input channels and a differential reference input, making it suitable for direct connection to transducers. It operates on a single supply voltage ranging from 2.7 V to 3.3 V or 4.75 V to 5.25 V, ensuring low power consumption and high accuracy in signal conversion.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 16 |
| Supply Voltage (Analog/Digital) | 2.7 V to 3.3 V, 4.75 V to 5.25 V |
| Number of Inputs | 2 (fully differential) |
| Input Signal Ranges | 0 mV to 20 mV, 0 V to 2.5 V (unipolar and bipolar) |
| Conversion Technique | Sigma-Delta (Σ-Δ) |
| Power Consumption | 1 mW (typical) |
| Package Types | 16-Lead PDIP, 16-Lead TSSOP, 16-Lead SOIC Wide |
| Interface | Serial (3-wire operation) |
Key Features
- Programmable Gain Front End: Allows for adjustable gain settings to accommodate various input signal ranges.
- On-Chip Digital Filter: The first notch of the digital filter can be programmed, enabling adjustment of the filter cutoff and output update rate.
- Self-Calibration and System Calibration: Options to eliminate gain and offset errors within the device or the system.
- Low Power Consumption: CMOS construction ensures very low power dissipation, with a power-down mode reducing standby power to 20 μW typical.
- Serial Interface: Configurable for 3-wire operation, allowing software configuration of gain settings, signal polarity, and update rate selection.
Applications
The AD7705BNZ is ideal for use in smart, microcontroller, or DSP-based systems. It is particularly suited for applications requiring precise analog-to-digital conversion, such as:
- Industrial measurement and control systems.
- Medical devices requiring accurate signal conversion.
- Automotive systems needing robust and low-power ADC solutions.
- Data acquisition systems in various industrial and scientific contexts.
Q & A
- What is the resolution of the AD7705BNZ ADC?
The AD7705BNZ has a resolution of 16 bits.
- What are the supply voltage ranges for the AD7705BNZ?
The device operates on a single supply voltage ranging from 2.7 V to 3.3 V or 4.75 V to 5.25 V.
- How many analog input channels does the AD7705BNZ have?
The AD7705BNZ features two fully differential analog input channels.
- What is the typical power consumption of the AD7705BNZ?
The typical power consumption is 1 mW.
- Can the AD7705BNZ be configured for different gain settings?
- What type of digital filter does the AD7705BNZ employ?
The device employs an on-chip digital filter with a programmable first notch.
- Does the AD7705BNZ support self-calibration?
- What is the standby power consumption in power-down mode?
The standby power consumption in power-down mode is 20 μW typical.
- What types of interfaces does the AD7705BNZ support?
The device supports a serial interface configurable for 3-wire operation.
- What are some common applications for the AD7705BNZ?
