Overview
The AD7715ARZ-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 flexibility. The AD7715 operates from a single supply of 3 V or 5 V and is suitable for use in smart, microcontroller, or DSP-based systems.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits, no missing codes |
| Supply Voltage | 3 V or 5 V |
| 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 |
| Programmable Gain | Gains of 1, 2, 32, and 128 |
| Package Types | 16-lead SOIC Wide, 16-lead PDIP, 16-lead TSSOP |
| Operating Temperature Range | -40°C to +85°C |
| Standby Power Consumption | 50 µW typical |
Key Features
- Differential analog input and differential reference input
- Programmable gain front end with gains of 1, 2, 32, and 128
- 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 for low power dissipation
- Ability to buffer the analog input
- Excellent static performance specifications: 16 bits no missing codes, ±0.0015% accuracy, and low rms noise (<550 nV)
Applications
The AD7715 is ideal for use in various applications, including:
- Low-frequency measurement systems
- Smart, microcontroller, or DSP-based systems
- Systems requiring direct connection to transducers or strain gages
- Isolated systems where the three-wire serial interface reduces the need for optocouplers
- Low-power systems due to its low supply current and standby power consumption
Q & A
- What is the resolution of the AD7715?
The AD7715 has a resolution of 16 bits with no missing codes.
- What are the supply voltage options for the AD7715?
The AD7715 can operate from a single supply of 3 V or 5 V.
- 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 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 types of packages are available for the AD7715?
The AD7715 is available in 16-lead SOIC Wide, 16-lead PDIP, and 16-lead TSSOP packages.
- What is the operating temperature range of the AD7715?
The operating temperature range is -40°C to +85°C.
- How does the AD7715 handle calibration?
The AD7715 features self-calibration and system calibration options to eliminate gain and offset errors.
- What is the standby power consumption of the AD7715?
The standby power consumption is 50 µW typical.
- Is the AD7715 suitable for low-power systems?
- What types of serial interfaces does the AD7715 support?
The AD7715 supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces.
