Overview
The AD7715ANZ-5, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This 16-bit Sigma-Delta Analog-to-Digital Converter (ADC) is capable of accepting low-level input signals directly from transducers and outputs a serial digital word. It employs a Sigma-Delta (Σ-Δ) conversion technique to achieve up to 16 bits of no missing codes performance. The AD7715 features a proprietary programmable gain front end based around an analog modulator, and the modulator output is processed by an on-chip digital filter. This device is ideal for use in smart, microcontroller, or DSP-based systems due to its low power consumption and versatile configuration options.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits |
| Supply Voltage | 5 V (AD7715-5), 3 V (AD7715-3) |
| Supply Current | 450 µA maximum @ 3 V supplies |
| Input Signal Ranges (Unipolar) | 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V, 0 V to 2.5 V |
| Input Signal Ranges (Bipolar) | ±20 mV, ±80 mV, ±1.25 V, ±2.5 V |
| Gain Settings | 1, 2, 32, 128 |
| Interface | Three-wire serial interface (SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible) |
| Package Types | 16-lead PDIP, 16-lead SOIC Wide, 16-lead TSSOP |
| Nonlinearity | ±0.0015% |
| RMS Noise | <550 nV |
Key Features
- Programmable gain front end with gains of 1, 2, 32, and 128.
- Differential analog input and differential reference input.
- Low supply current: 450 µA maximum @ 3 V supplies.
- Low-pass filter with programmable output update rate.
- Three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- Self-calibration and system calibration options to eliminate gain and offset errors.
- CMOS construction ensuring low power dissipation.
- Power-down mode reducing standby power consumption to 50 µW typical.
Applications
The AD7715 is particularly suited for low-frequency measurement applications in various systems, including:
- Smart systems.
- Microcontroller-based systems.
- DSP-based systems.
- Strain gage and transducer interfaces.
- Industrial automation and control systems.
- Medical devices requiring precise analog-to-digital conversion.
Q & A
- What is the resolution of the AD7715 ADC?
The AD7715 has a resolution of 16 bits.
- What are the supply voltage options for the AD7715?
The AD7715 can operate from either a 3 V or 5 V single supply.
- What is the maximum supply current of the AD7715 at 3 V supplies?
The maximum supply current is 450 µA.
- What are the input signal ranges supported by the AD7715?
The AD7715 supports unipolar ranges of 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V, and 0 V to 2.5 V, as well as bipolar ranges of ±20 mV, ±80 mV, ±1.25 V, and ±2.5 V.
- What types of interfaces does the AD7715 support?
The AD7715 supports three-wire serial interfaces compatible with SPI, QSPI, MICROWIRE, and DSP.
- What are the package options available for the AD7715?
The AD7715 is available in 16-lead PDIP, 16-lead SOIC Wide, and 16-lead TSSOP packages.
- How does the AD7715 handle gain and offset errors?
The AD7715 includes self-calibration and system calibration options to eliminate gain and offset errors.
- What is the standby power consumption of the AD7715 in power-down mode?
The standby power consumption is 50 µW typical in power-down mode.
- What are some common applications of the AD7715?
The AD7715 is commonly used in smart systems, microcontroller-based systems, DSP-based systems, and industrial automation and control systems.
- How does the AD7715's digital filter work?
The AD7715's digital filter is programmable via the on-chip control register, allowing adjustment of the filter cutoff and output update rate.
