Overview
The AD7787BRMZ, produced by Analog Devices Inc., is a low-power, 2-channel 24-bit Sigma-Delta Analog-to-Digital Converter (ADC). This device is designed as a complete analog front end for low-frequency measurement applications. It features a low noise, high-resolution ADC with one differential input and one single-ended input, which can be buffered or unbuffered. The AD7787 operates from a power supply ranging from 2.5 V to 5.25 V and is housed in a compact 10-lead Mini Small Outline Package (MSOP) or Thin Fine-Pitch Small Outline Package (TFSOP).
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Sampling Rate | 9.5 Hz to 120 Hz | Hz | Software programmable |
| Number of Inputs | 2 | - | Differential and single-ended |
| Input Type | Bipolar, Unipolar | - | - |
| Data Interface | SPI, QSPI, MICROWIRE, DSP compatible | - | - |
| Power Supply | 2.5 V to 5.25 V | V | - |
| Power Consumption (Normal Mode) | 75 µA max | µA | - |
| Power Consumption (Power-down Mode) | 1 µA max | µA | - |
| RMS Noise | 1.1 µV at 9.5 Hz update rate | µV | - |
| Integral Nonlinearity | ±15 ppm of FSR max, 3.5 ppm typical | ppm | - |
| Offset Error | ±3 µV typical | µV | - |
| Temperature Range | -40°C to +105°C | °C | - |
| Package Type | 10-lead MSOP or TFSOP | - | - |
Key Features
- Low power consumption: 75 µA max in normal mode and 1 µA max in power-down mode.
- High resolution: 24-bit Sigma-Delta ADC with 19.5-bit p-p resolution at 9.5 Hz update rate.
- Low noise: RMS noise of 1.1 µV at 9.5 Hz update rate.
- Simultaneous 50 Hz and 60 Hz rejection.
- Internal clock oscillator and rail-to-rail input buffer.
- VDD monitor channel and temperature measurement capability.
- 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
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 AD7787 ADC?
The AD7787 has a 24-bit resolution with 19.5-bit p-p resolution at a 9.5 Hz update rate.
- What is the power consumption of the AD7787 in normal and power-down modes?
The power consumption is 75 µA max in normal mode and 1 µA max in power-down mode.
- What is the RMS noise of the AD7787 at the 9.5 Hz update rate?
The RMS noise is 1.1 µV at the 9.5 Hz update rate.
- What types of inputs does the AD7787 support?
The AD7787 supports both differential and single-ended inputs.
- What is the temperature range of the AD7787?
The temperature range is -40°C to +105°C.
- What interfaces does the AD7787 support?
The AD7787 supports SPI, QSPI, MICROWIRE, and DSP compatible interfaces.
- What is the power supply range for the AD7787?
The power supply range is from 2.5 V to 5.25 V.
- What are some common applications of the AD7787?
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 package type of the AD7787?
The AD7787 is housed in a 10-lead MSOP or TFSOP package).
- Does the AD7787 have internal clock and buffer capabilities?
Yes, the AD7787 has an internal clock oscillator and a rail-to-rail input buffer).
