Overview
The AD7787BRM-REEL is a low-power, 2-channel 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. This device is designed for low-frequency measurement applications and serves as a complete analog front end. It features a low noise, high-resolution ADC with both differential and single-ended input channels, which can be buffered or unbuffered. The AD7787BRM-REEL operates from an internal clock oscillator, eliminating the need for an external clock source. It is housed in a 10-lead Mini Small Outline Package (MSOP) and is suitable for a variety of applications requiring precise and low-power analog-to-digital conversion.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Sampling Rate (Per Second) | 9.5 Hz to 120 Hz | Hz | Software programmable |
| Number of Inputs | 2 | - | Differential and Single-Ended |
| Data Interface | SPI, QSPI, MICROWIRE, DSP | - | - |
| Architecture | Sigma-Delta | - | - |
| Reference Type | External | - | - |
| Voltage - Supply, Analog | 2.5 V to 5.25 V | V | - |
| Voltage - Supply, Digital | 2.5 V to 5.25 V | V | - |
| Power Consumption (Max) | 225 µW @ 3 V supply | µW | - |
| Temperature Range | -40°C to +105°C | °C | - |
| Integral Nonlinearity | ±3.5 ppm typical | ppm | - |
| Output Noise | 1.1 µV rms @ 9.5 Hz update rate | µV | - |
Key Features
- Low power consumption with a maximum of 225 µW at a 3 V supply and 1 µA in power-down mode.
- High resolution with 19.5-bit peak-to-peak resolution and 22 bits effective resolution at a 9.5 Hz update rate.
- Low noise performance with an RMS noise of 1.1 µV at the lower update rate.
- Simultaneous 50 Hz and 60 Hz rejection.
- Internal clock oscillator, eliminating the need for an external clock source.
- Rail-to-rail input buffer.
- VDD monitor channel.
- 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- Schmitt trigger on SCLK for improved noise immunity.
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-REEL?
The AD7787BRM-REEL has a 24-bit resolution with 19.5-bit peak-to-peak resolution and 22 bits effective resolution at a 9.5 Hz update rate.
- What is the power consumption of the AD7787BRM-REEL?
The maximum power consumption is 225 µW at a 3 V supply, and it consumes 1 µA in power-down mode.
- What is the temperature range of the AD7787BRM-REEL?
The device operates within a temperature range of -40°C to +105°C.
- Does the AD7787BRM-REEL require an external clock source?
No, the AD7787BRM-REEL operates from an internal clock oscillator, eliminating the need for an external clock source.
- What are the input types supported by the AD7787BRM-REEL?
The device supports both differential and single-ended inputs, which can be buffered or unbuffered.
- What is the data interface of the AD7787BRM-REEL?
The device features a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- What are some of the key applications of the AD7787BRM-REEL?
The device is suitable for smart transmitters, battery applications, portable instrumentation, sensor measurement, temperature measurement, pressure measurement, weigh scales, and 4 to 20 mA loops.
- What is the noise performance of the AD7787BRM-REEL?
The device has an RMS noise of 1.1 µV at the lower update rate of 9.5 Hz.
- What is the package type of the AD7787BRM-REEL?
The device is housed in a 10-lead Mini Small Outline Package (MSOP).
- What is the supply voltage range for the AD7787BRM-REEL?
The device operates with a supply voltage range of 2.5 V to 5.25 V for both analog and digital supplies.
