Overview
The AD7714AN-3 is a 24-bit sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. It is designed as a complete analog front end for low-frequency measurement applications, capable of accepting low-level signals directly from transducers and outputting a serial digital word. The device employs a sigma-delta conversion technique to achieve up to 24 bits of no missing codes performance. It operates from a single 3V supply and is suitable for use in smart, microcontroller- or DSP-based systems.
Key Specifications
| Parameter | Value | Units | Conditions/Comments |
|---|---|---|---|
| Number of Bits | 24 | - | No missing codes |
| Input Type | Differential/Pseudo-Differential | - | Three fully differential or five pseudo-differential inputs |
| Programmable Gain | 1 to 128 | - | Configurable via software |
| Supply Voltage | 3 V | V | Single supply operation |
| Operating Temperature | -40°C to +85°C | °C | - |
| Current Consumption | 350 μA (typical), 5 μA (power-down) | μA | - |
| Noise | < 150 nV rms | nV | - |
| Sampling Rate | 19.2 kSPS | SPS | - |
| Interface | SPI, QSPI, MICROWIRE, DSP compatible | - | Three-wire serial interface |
| Package | 24-pin DIP, 24-lead SOIC, 28-lead SSOP | - | - |
Key Features
- Charge balancing ADC with up to 24 bits of no missing codes performance.
- Programmable gain front end with gains from 1 to 128.
- Three fully differential or five pseudo-differential analog inputs.
- Differential reference input.
- Low noise (<150 nV rms) and low current consumption (350 μA typical, 5 μA in power-down mode).
- Three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- Self-calibration, system calibration, and background calibration options.
- Ability to read and write calibration coefficients.
- Programmable low-pass filter with adjustable filter cutoffs.
- CMOS construction for low power dissipation.
Applications
- Portable industrial instruments.
- Portable weigh scales.
- Loop-powered systems.
- Pressure transducers.
- Smart, microcontroller- or DSP-based systems.
Q & A
- What is the resolution of the AD7714AN-3 ADC?
The AD7714AN-3 has a resolution of up to 24 bits with no missing codes.
- What are the input configurations of the AD7714AN-3?
The device can be configured as three fully differential or five pseudo-differential analog inputs.
- What is the supply voltage for the AD7714AN-3?
The AD7714AN-3 operates from a single 3V supply.
- What is the typical current consumption of the AD7714AN-3?
The typical current consumption is 350 μA, and it reduces to 5 μA in power-down mode.
- What type of interface does the AD7714AN-3 use?
The device uses a three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- What are the calibration options available for the AD7714AN-3?
The device offers self-calibration, system calibration, and background calibration options.
- Can the AD7714AN-3 be used in low-power applications?
Yes, the CMOS construction of the AD7714AN-3 ensures very low power dissipation, making it suitable for low-power applications.
- What are the typical noise levels of the AD7714AN-3?
The noise level is less than 150 nV rms.
- What is the sampling rate of the AD7714AN-3?
The sampling rate is 19.2 kSPS.
- In what packages is the AD7714AN-3 available?
The device is available in 24-pin DIP, 24-lead SOIC, and 28-lead SSOP packages.
