Overview
The AD7715AR-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 conversion technique to achieve up to 16 bits of no missing codes performance. The device features a programmable gain front end, differential analog and reference inputs, and operates from a single supply voltage of either 3 V or 5 V. It is ideal for use in smart, microcontroller, or DSP-based systems due to its low power consumption and versatile serial interface.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits |
| 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 |
| Nonlinearity | ±0.0015% |
| Output Update Rate | 50 Hz to 600 Hz |
| Package Types | 16-lead SOIC, PDIP, TSSOP |
| Operating Temperature Range | −40°C to +85°C |
Key Features
- Programmable gain front end with gains of 1, 2, 32, and 128
- Differential analog and reference inputs
- 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
- Low power consumption with a standby current of less than 10 µA
- CMOS construction for low power dissipation
- Internal buffer and reference
- High noise performance with an SNR of 85 dB min @ 10 Hz
Applications
The AD7715AR-5 is ideal for various applications, including:
- Smart systems and microcontroller-based designs
- DSP-based systems requiring high precision analog-to-digital conversion
- Low-frequency measurement applications such as those involving strain gages or transducers
- Isolated systems where the three-wire serial interface reduces the need for optocouplers
Q & A
- What is the resolution of the AD7715AR-5?
The AD7715AR-5 has a resolution of 16 bits.
- What are the supply voltage options for the AD7715AR-5?
The AD7715AR-5 can operate from a single supply voltage of either 3 V or 5 V.
- What is the maximum supply current of the AD7715AR-5 at 3 V supplies?
The maximum supply current is 450 µA.
- What are the input signal ranges supported by the AD7715AR-5?
The device 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 AD7715AR-5?
The device is available in 16-lead SOIC, PDIP, and TSSOP packages.
- What is the operating temperature range of the AD7715AR-5?
The operating temperature range is −40°C to +85°C.
- Does the AD7715AR-5 support self-calibration and system calibration?
- What is the standby current of the AD7715AR-5?
The standby current is less than 10 µA.
- Is the AD7715AR-5 compatible with various serial interfaces?
- What is the signal-to-noise ratio (SNR) of the AD7715AR-5?
The SNR is 85 dB min @ 10 Hz.
