Overview
The AD7705BRZ, produced by Analog Devices Inc., is a 16-bit, low-power, Sigma-Delta Analog-to-Digital Converter (ADC) designed for low-frequency measurement applications. This device is part of the AD7705/AD7706 family, which provides complete analog front ends for systems requiring precise signal conditioning and conversion. The AD7705BRZ features two fully differential analog input channels, making it suitable for a wide range of applications, including those in smart, microcontroller, or DSP-based systems.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 16 bits, no missing codes |
| Input Channels | 2 fully differential analog input channels |
| Input Signal Ranges | 0 mV to 20 mV, 0 V to 2.5 V, ±20 mV to ±2.5 V |
| Supply Voltage | 2.7 V to 3.3 V or 4.75 V to 5.25 V |
| Power Dissipation | 1 mW maximum @ 3 V |
| Standby Current | 8 μA maximum |
| Nonlinearity | ±0.003% |
| Serial Interface | 3-wire, SPI-, QSPI-, MICROWIRE-, and DSP-compatible |
| Package Options | 16-lead PDIP, 16-lead SOIC, 16-lead TSSOP |
Key Features
- Programmable gain front end with gains from 1 to 128, allowing for both low-level and high-level analog inputs without external signal conditioning hardware.
- Differential reference input for maximum flexibility in ratiometric applications.
- On-chip digital filter with programmable filter cutoff and output update rate.
- Self-calibration and system calibration options to eliminate gain and offset errors.
- Low power consumption with CMOS construction, reducing standby power to 20 μW typ.
- Ability to buffer the analog input and handle bipolar input signal ranges.
- 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
Applications
The AD7705BRZ is ideal for use in various applications, including:
- Smart systems and IoT devices requiring precise analog-to-digital conversion.
- Microcontroller and DSP-based systems where low power and high precision are critical.
- Industrial control systems, such as those in process control and automation.
- Medical devices that require accurate and low-noise signal conversion.
- Automotive and aerospace applications where reliability and precision are paramount.
Q & A
- What is the resolution of the AD7705BRZ?
The AD7705BRZ has a resolution of 16 bits with no missing codes.
- How many input channels does the AD7705BRZ have?
The AD7705BRZ features two fully differential analog input channels.
- What are the input signal ranges for the AD7705BRZ?
The input signal ranges include 0 mV to 20 mV, 0 V to 2.5 V, and ±20 mV to ±2.5 V.
- What is the supply voltage range for the AD7705BRZ?
The supply voltage range is from 2.7 V to 3.3 V or 4.75 V to 5.25 V.
- What is the maximum power dissipation of the AD7705BRZ?
The maximum power dissipation is 1 mW at 3 V.
- What is the standby current of the AD7705BRZ?
The standby current is 8 μA maximum.
- Does the AD7705BRZ support self-calibration?
Yes, the AD7705BRZ supports self-calibration and system calibration to eliminate gain and offset errors.
- What types of serial interfaces are supported by the AD7705BRZ?
The AD7705BRZ supports 3-wire serial interfaces compatible with SPI, QSPI, MICROWIRE, and DSP.
- What are the package options available for the AD7705BRZ?
The package options include 16-lead PDIP, 16-lead SOIC, and 16-lead TSSOP.
- What are some typical applications of the AD7705BRZ?
Typical applications include smart systems, microcontroller and DSP-based systems, industrial control systems, medical devices, and automotive and aerospace applications.
