Overview
The AD7782BRU, produced by Analog Devices Inc., is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for low-frequency measurement applications. It features two fully differential analog input channels, which can be configured with a gain of 1 or 16, allowing for full-scale input signal ranges of ±2.56 V or ±160 mV. The device operates from a single 3 V or 5 V supply and is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP). The AD7782 is characterized by its simple, read-only digital interface that can operate in master or slave mode, with no on-chip registers to be programmed.
Key Specifications
| Parameter | Value | Unit | Test Conditions |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Number of Input Channels | 2 | - | - |
| Input Type | Differential | - | - |
| Input Voltage Range | ±160 mV or ±2.56 V | V | RANGE = 0 or 1 |
| Output Update Rate | 19.79 Hz | Hz | nominal |
| Supply Voltage | 2.7 V ~ 3.6 V, 5 V | V | digital and analog |
| Operating Temperature | -40°C to +85°C | °C | - |
| Package Type | 16-lead TSSOP | - | - |
| Reference Type | External | - | - |
| Power Consumption (Normal) | 1.3 mA @ 3 V | mA | - |
| Power Consumption (Power-Down) | 9 µA | µA | - |
Key Features
- 24-bit sigma-delta ADC with two fully differential analog input channels.
- Configurable gain of 1 or 16.
- Simple, read-only digital interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- No on-chip registers to be programmed.
- Rail-to-rail input buffer and programmable gain amplifier (PGA).
- Simultaneous 50 Hz and 60 Hz rejection at the specified update rate.
- External +2.5 V differential reference input required.
- Low power consumption: 3.9 mW at 3 V supply.
Applications
- Sensor measurement.
- Industrial process control.
- Temperature measurement.
- Pressure measurements.
- Weigh scales.
- Portable instrumentation.
Q & A
- What is the resolution of the AD7782 ADC?
The AD7782 is a 24-bit sigma-delta ADC, offering high resolution for precise measurements. - How many input channels does the AD7782 have?
The AD7782 has two fully differential analog input channels. - What are the input voltage ranges for the AD7782?
The input voltage ranges are ±160 mV or ±2.56 V, depending on the gain configuration. - What is the output update rate of the AD7782?
The output update rate is 19.79 Hz. - What are the power supply options for the AD7782?
The AD7782 can operate from a single 3 V or 5 V supply. - What is the operating temperature range of the AD7782?
The operating temperature range is -40°C to +85°C. - What type of package does the AD7782 come in?
The AD7782 is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP). - Does the AD7782 require any on-chip register programming?
No, the AD7782 has a simple, read-only digital interface and does not require any on-chip register programming. - What types of interfaces does the AD7782 support?
The AD7782 supports SPI, QSPI, MICROWIRE, and DSP-compatible interfaces. - What is the power consumption of the AD7782 in normal and power-down modes?
In normal mode, the power consumption is 1.3 mA @ 3 V, and in power-down mode, it is 9 µA.
