Overview
The AD7715ACHIPS-3, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This component employs a Σ-Δ conversion technique to achieve up to 16 bits of no missing codes performance. It can accept low-level input signals directly from transducers and outputs a serial digital word. The AD7715 features a programmable gain front end, differential analog and reference inputs, and operates from a single 3 V or 5 V supply. It is ideal for use in smart, microcontroller, or DSP-based systems due to its low power consumption and advanced signal conditioning capabilities.
Key Specifications
| Parameter | Value | Unit | Conditions/Comments |
|---|---|---|---|
| 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 | - | Referenced to the negative input of the differential analog input |
| Supply Voltage | 3 V (AD7715-3) or 5 V (AD7715-5) | V | - |
| Supply Current | 450 µA maximum @ 3 V supplies | µA | - |
| Standby Current | Less than 10 µA | µA | - |
| Package Types | 16-lead SOIC/PDIP/TSSOP | - | - |
| Operating Temperature | −40°C to +85°C | °C | - |
Key Features
- Programmable gain front end with gains of 1, 2, 32, and 128
- Differential analog and reference inputs
- Three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP
- Ability to buffer the analog input
- Low-pass filter with programmable output update rate
- Self-calibration and system calibration options to eliminate gain and offset errors
- Low power consumption: 450 µA maximum at 3 V supplies and less than 10 µA in standby mode
- CMOS construction for low power dissipation
Applications
The AD7715 is ideal for use in various low-frequency measurement applications, including:
- Smart systems
- Microcontroller-based systems
- DSP-based systems
- Strain gage and transducer interfaces
- Isolated systems where the three-wire serial interface reduces the need for optocouplers
Q & A
- What is the resolution of the AD7715? The AD7715 has a resolution of 16 bits with no missing codes.
- What are the programmable gain settings of the AD7715? The AD7715 has programmable gain settings of 1, 2, 32, and 128.
- What are the input signal ranges supported by the AD7715? The AD7715 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 AD7715? The AD7715 operates from a single 3 V or 5 V supply and consumes less than 450 µA at 3 V supplies.
- What types of packages are available for the AD7715? The AD7715 is available in 16-lead SOIC, PDIP, and TSSOP packages.
- What is the operating temperature range of the AD7715? The AD7715 operates over a temperature range of −40°C to +85°C.
- Does the AD7715 support calibration? Yes, the AD7715 supports self-calibration and system calibration to eliminate gain and offset errors.
- How does the AD7715 interface with other components? The AD7715 features a three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- What are the power-saving features of the AD7715? The AD7715 has a low power consumption of 450 µA maximum at 3 V supplies and less than 10 µA in standby mode.
- What is the significance of CMOS construction in the AD7715? The CMOS construction ensures very low power dissipation.
