Overview
The AD7787BRM, manufactured by Analog Devices Inc., is a low-power, 2-channel 24-bit sigma-delta analog-to-digital converter (ADC). This component is designed to serve as a complete analog front end for low-frequency measurement applications. It features a low noise profile, simultaneous 50 Hz and 60 Hz rejection, and a rail-to-rail input buffer, making it suitable for a variety of precision measurement tasks.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Output Update Rate | 9.5 Hz min, 120 Hz max | Hz | nominal |
| Resolution | 19.5 Bits p-p | - | at 9.5 Hz update rate |
| Output Noise | 1.1 µV rms typ | µV | - |
| Integral Nonlinearity | ±15 ppm of FSR max, 3.5 ppm typ | ppm | - |
| Offset Error | ±3 µV typ | µV | - |
| Offset Error Drift vs. Temperature | ±10 nV/°C typ | nV/°C | - |
| Full-Scale Error | ±10 µV typ | µV | - |
| Gain Drift vs. Temperature | ±0.5 ppm/°C typ | ppm/°C | - |
| Power Supply Rejection | 90 dB min, 100 dB typ | dB | AIN = 1 V |
| Power Consumption | 75 µA max in normal operation, 1 µA max in power-down mode | µA | - |
| Temperature Range | −40°C to +105°C | °C | - |
| Package | 10-Lead Mini Small Outline Package (MSOP) | - | - |
Key Features
- Low power consumption: 75 µA max in normal operation and 1 µA max in power-down mode.
- High resolution: 24-bit sigma-delta ADC with 19.5-bit p-p resolution at a 9.5 Hz update rate.
- Low noise: 1.1 µV rms typical output noise.
- Simultaneous 50 Hz and 60 Hz rejection.
- Rail-to-rail input buffer.
- Internal clock oscillator.
- VDD monitor channel.
- 3-wire serial SPI, QSPI, MICROWIRE, and DSP compatible interface.
Applications
- Smart transmitters.
- Battery applications.
- Portable instrumentation.
- Sensor measurement.
- Temperature measurement.
- Pressure measurement.
- Weigh scales.
- 4 to 20 mA loops.
Q & A
- What is the resolution of the AD7787BRM ADC?
The AD7787BRM has a resolution of 19.5 bits p-p at a 9.5 Hz update rate, with an effective resolution of 22 bits. - What is the power consumption of the AD7787BRM?
The power consumption is 75 µA max in normal operation and 1 µA max in power-down mode. - What is the temperature range of the AD7787BRM?
The temperature range is −40°C to +105°C. - What type of interface does the AD7787BRM use?
The AD7787BRM uses a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP. - What are some common applications of the AD7787BRM?
Common applications include smart transmitters, battery applications, portable instrumentation, sensor measurement, temperature measurement, pressure measurement, weigh scales, and 4 to 20 mA loops. - What is the output noise of the AD7787BRM?
The output noise is 1.1 µV rms typical. - Does the AD7787BRM have simultaneous 50 Hz and 60 Hz rejection?
Yes, it does have simultaneous 50 Hz and 60 Hz rejection. - What is the package type of the AD7787BRM?
The package type is a 10-Lead Mini Small Outline Package (MSOP). - Is the AD7787BRM RoHS compliant?
Yes, the AD7787BRM is RoHS compliant. - What is the typical integral nonlinearity of the AD7787BRM?
The typical integral nonlinearity is 3.5 ppm.
