Overview
The AD7714AR-3 is a 24-bit sigma-delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This device is designed as a complete analog front end for low-frequency measurement applications, making it ideal for use in smart, microcontroller- or DSP-based systems. It accepts low-level signals directly from a transducer and outputs a serial digital word, employing a sigma-delta conversion technique to achieve up to 24 bits of no missing codes performance.
Key Specifications
| Parameter | Value | Units | Comments |
|---|---|---|---|
| Number of Bits | 24 | - | No missing codes |
| Input Type | Differential, Pseudo-Differential | - | Three differential or five pseudo-differential inputs |
| Gain Settings | 1 to 128 | - | Programmable gain front end |
| Supply Voltage | 3 V ~ 3.6 V (Analog), 3 V ~ 5.25 V (Digital) | V | Single supply operation |
| Sampling Rate | 1 kSPS | samples per second | - |
| Noise | < 150 nV rms | nV | Low noise performance |
| Current Consumption | 350 μA (typ), 5 μA (power-down) | μA | Low power consumption |
| Package | 24-SOIC (0.295", 7.50mm Width) | - | - |
| Data Interface | SPI, QSPI, MICROWIRE, DSP compatible | - | Three-wire serial interface |
Key Features
- Charge balancing ADC with 24-bit resolution and no missing codes.
- Programmable gain front end with gains from 1 to 128.
- Three differential or five pseudo-differential analog inputs.
- Low noise performance (< 150 nV rms) and low current consumption (350 μA typ).
- Power-down mode reducing standby power consumption to 15 μW typ.
- Self-calibration, system calibration, and background calibration options.
- Ability to read and write calibration coefficients.
- Programmable digital filter with adjustable filter cutoff and settling time.
- CMOS construction ensuring low power dissipation.
- SPI, QSPI, MICROWIRE, and DSP compatible three-wire serial interface.
Applications
- Portable industrial instruments.
- Portable weigh scales.
- Loop-powered systems.
- Pressure transducers.
Q & A
- What is the resolution of the AD7714AR-3 ADC?
The AD7714AR-3 has a 24-bit resolution with no missing codes.
- What are the gain settings available on the AD7714AR-3?
The gain settings range from 1 to 128 and are programmable.
- What types of analog inputs does the AD7714AR-3 support?
The device supports three differential or five pseudo-differential analog inputs.
- What is the supply voltage range for the AD7714AR-3?
The supply voltage range is 3 V ~ 3.6 V for analog and 3 V ~ 5.25 V for digital.
- What is the typical current consumption of the AD7714AR-3?
The typical current consumption is 350 μA, with a power-down mode of 5 μA.
- What data interface protocols does the AD7714AR-3 support?
The device supports SPI, QSPI, MICROWIRE, and DSP compatible three-wire serial interface.
- Does the AD7714AR-3 have calibration options?
Yes, it offers self-calibration, system calibration, and background calibration options.
- What is the noise performance of the AD7714AR-3?
The noise performance is less than 150 nV rms.
- In what package is the AD7714AR-3 available?
The device is available in a 24-SOIC package (0.295", 7.50mm Width).
- What are some common applications of the AD7714AR-3?
Common applications include portable industrial instruments, portable weigh scales, loop-powered systems, and pressure transducers.
