Overview
The AD7712AN, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This 24-bit analog-to-digital converter (ADC) features two analog input channels, making it ideal for use in smart, microcontroller-based systems. The device supports both high-level and low-level analog input signals, with programmable gain settings and differential input capabilities for the low-level channel. It is particularly suited for applications requiring high accuracy and low power consumption, with features such as self-calibration, system calibration, and background calibration options.
Key Specifications
| Parameter | Value | Unit | Conditions/Comments |
|---|---|---|---|
| Resolution | 24 Bits | - | No missing codes guaranteed by design |
| Sampling Rate | 19.5 kSPS | - | - |
| Supply Voltage | 4.75 V to 10 V | V | Analog and digital supply voltage range |
| Power Consumption | 25 mW (typical), 100 µW (power-down mode) | mW/µW | Typical operating and power-down mode power consumption |
| Linearity Error | ±0.0015% (nonlinearity) | % | - |
| Interface | SPI, Serial | - | Bidirectional microcontroller serial interface |
| Reference Type | External, Internal | - | Option for internal or external reference voltage |
| Number of Analog In Channels | 2 | - | High-level and low-level analog input channels |
| Package Type | 24-lead DIP, 24-lead SOIC | - | Available package types |
Key Features
- Charge balancing ADC with no missing codes, ensuring a true 23-bit dynamic range and excellent ±0.0015% accuracy
- Programmable gain for both input channels, with gains from 1 to 128
- Differential input for low-level channel and low-pass filter with programmable filter cutoffs
- Ability to read/write calibration coefficients and support for self-calibration, system calibration, and background calibration
- Single- or dual-supply operation and low power consumption with a power-down mode
- Bidirectional microcontroller serial interface (SPI) for configuration and data transfer
Applications
The AD7712AN is ideal for various industrial and measurement applications, including:
- Process control systems
- Smart transmitters
- Portable industrial instruments
- Microcontroller or DSP processor-based systems
Q & A
- What is the resolution of the AD7712AN ADC?
The AD7712AN has a resolution of 24 bits with no missing codes. - What is the sampling rate of the AD7712AN?
The sampling rate is 19.5 kSPS. - What are the supply voltage requirements for the AD7712AN?
The device operates with a supply voltage range of 4.75 V to 10 V. - How much power does the AD7712AN consume?
The typical power consumption is 25 mW, and it reduces to 100 µW in power-down mode. - What types of calibration does the AD7712AN support?
The device supports self-calibration, system calibration, and background calibration. - What interface does the AD7712AN use for communication?
The AD7712AN uses a bidirectional SPI serial interface. - Can the AD7712AN operate with both internal and external reference voltages?
Yes, it supports both internal and external reference voltage options. - How many analog input channels does the AD7712AN have?
The device has two analog input channels. - In what packages is the AD7712AN available?
The AD7712AN is available in 24-lead DIP and 24-lead SOIC packages. - What are some typical applications for the AD7712AN?
Typical applications include process control systems, smart transmitters, portable industrial instruments, and microcontroller or DSP processor-based systems.
