Overview
The AD7719BR-REEL7, produced by Analog Devices Inc., is a low voltage, low power, factory-calibrated 16-/24-bit dual analog-to-digital converter (ADC). This device is designed as a complete analog front end for low frequency measurement applications. It integrates two high resolution Σ-Δ ADCs, along with various on-chip functions such as switchable matched excitation current sources, low-side power switches, a digital I/O port, and a temperature sensor. The AD7719 operates from a single 3 V or 5 V supply, making it suitable for a wide range of applications requiring high precision and low power consumption.
Key Specifications
| Parameter | Value | Unit | Test Conditions |
|---|---|---|---|
| Resolution | 24-bit (main channel), 16-bit (auxiliary channel) | - | - |
| Output Update Rate | 5.4 Hz min, 105 Hz max | Hz | Both channels synchronized |
| Integral Nonlinearity | ±10 ppm of FSR max | ppm | TMIN to TMAX |
| Offset Error | ±3 µV typ | µV | - |
| Power Supply | 3 V or 5 V | V | - |
| Power Dissipation | 4.5 mW (both ADCs enabled), 2.85 mW (main ADC enabled) | mW | 3 V supply |
| Input Voltage Range | ±1.024 × REFIN1/GAIN V (main channel), ±REFIN2 V (auxiliary channel) | V | - |
| Package | 28-lead SOIC and TSSOP | - | - |
Key Features
- High resolution Σ-Δ ADCs with 24-bit main channel and 16-bit auxiliary channel.
- Rail-to-rail input buffer and programmable gain amplifier (PGA).
- On-chip temperature sensor and 4-bit digital I/O port.
- Switchable matched excitation current sources and low-side power switches.
- Reference detect circuit for external reference monitoring.
- Software programmable output data rate.
- Low power consumption with 4.5 mW power dissipation at 3 V supply.
Applications
- Sensor measurement and temperature measurement.
- Pressure measurement and weigh scales.
- Portable instrumentation and 4 to 20 mA transmitters.
Q & A
- What is the resolution of the AD7719BR-REEL7?
The AD7719BR-REEL7 has a 24-bit resolution for the main channel and a 16-bit resolution for the auxiliary channel. - What are the power supply options for the AD7719BR-REEL7?
The device operates from a single 3 V or 5 V supply. - What is the power dissipation of the AD7719BR-REEL7?
The power dissipation is 4.5 mW with both ADCs enabled and 2.85 mW with only the main ADC enabled at 3 V supply. - What are the input voltage ranges for the AD7719BR-REEL7?
The main channel accepts input voltage ranges from ±1.024 × REFIN1/GAIN V, and the auxiliary channel accepts ±REFIN2 V. - Does the AD7719BR-REEL7 have on-chip temperature sensing?
Yes, the device includes an on-chip temperature sensor. - What are the package options for the AD7719BR-REEL7?
The device is available in 28-lead SOIC and TSSOP packages. - What are some typical applications of the AD7719BR-REEL7?
Typical applications include sensor measurement, temperature measurement, pressure measurement, weigh scales, portable instrumentation, and 4 to 20 mA transmitters. - Is the output data rate of the AD7719BR-REEL7 programmable?
Yes, the output data rate is software programmable. - Does the AD7719BR-REEL7 have switchable excitation current sources?
Yes, the device includes switchable matched excitation current sources. - What is the integral nonlinearity of the AD7719BR-REEL7?
The integral nonlinearity is ±10 ppm of FSR max.
