Overview
The AD7715AR-3, 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 outputting a serial digital word. It employs a proprietary programmable gain front end and an on-chip digital filter to achieve high accuracy and low noise performance. The AD7715AR-3 operates from a single 3 V supply and is ideal for use in smart, microcontroller, or DSP-based systems due to its low power consumption and flexible serial interface.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits, no missing codes |
| Nonlinearity | ±0.0015% |
| Programmable Gain | 1, 2, 32, 128 |
| 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 |
| Supply Voltage | 3 V (AD7715-3), 5 V (AD7715-5) |
| Supply Current | Less than 450 µA @ 3 V supplies |
| Standby Current | Less than 10 µA |
| Package Types | 16-lead SOIC, PDIP, TSSOP |
| Serial Interface | SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible three-wire interface |
Key Features
- Differential analog and reference inputs
- Programmable gain front end to accept signals directly from transducers or strain gages
- Low-pass filter with programmable output update rate
- Self-calibration and system calibration options to eliminate gain and offset errors
- Low power consumption with CMOS construction and power-down mode reducing standby power to 50 µW typical
- Ability to buffer the analog input
- Flexible serial interface configurable for three-wire operation
Applications
The AD7715AR-3 is ideal for use in various applications, including:
- Low-frequency measurement systems
- Smart, microcontroller, or DSP-based systems
- Systems requiring direct signal conditioning from transducers or strain gages
- Isolated systems where the reduction of interconnect lines and optocouplers is beneficial
Q & A
- What is the resolution of the AD7715AR-3?
The AD7715AR-3 has a resolution of 16 bits with no missing codes.
- What are the programmable gain settings of the AD7715AR-3?
The AD7715AR-3 has programmable gain settings of 1, 2, 32, and 128.
- What are the input signal ranges supported by the AD7715AR-3?
The AD7715AR-3 supports unipolar input signal 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 is the supply voltage and current of the AD7715AR-3?
The AD7715AR-3 operates from a single 3 V supply and consumes less than 450 µA at 3 V supplies.
- What types of packages are available for the AD7715AR-3?
The AD7715AR-3 is available in 16-lead SOIC, PDIP, and TSSOP packages.
- What kind of serial interface does the AD7715AR-3 support?
The AD7715AR-3 supports SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible three-wire serial interfaces.
- Does the AD7715AR-3 have calibration options?
Yes, the AD7715AR-3 includes self-calibration and system calibration options to eliminate gain and offset errors.
- How does the AD7715AR-3 manage power consumption?
The AD7715AR-3 features low power consumption with CMOS construction and a power-down mode that reduces standby power to 50 µW typical.
- Can the AD7715AR-3 buffer the analog input?
Yes, the AD7715AR-3 has the ability to buffer the analog input.
- What are some typical applications for the AD7715AR-3?
The AD7715AR-3 is typically used in low-frequency measurement systems, smart, microcontroller, or DSP-based systems, and systems requiring direct signal conditioning from transducers or strain gages.
