Overview
The AD7738BRU, produced by Analog Devices Inc., is a high-precision, high-throughput analog front end. This 24-bit Sigma-Delta analog-to-digital converter (ADC) is designed for high-resolution multiplexing applications. It features eight single-ended or four fully differential input channels, offering unipolar or bipolar input ranges of 625 mV, 1.25 V, and 2.5 V. The device is configurable via a simple digital interface, allowing users to balance noise performance against data throughput up to 15.4 kHz. The AD7738BRU operates over an extended industrial temperature range of –40°C to +105°C, making it suitable for a wide range of industrial and automotive applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comment |
|---|---|---|---|---|---|
| Number of Bits | 24 | ||||
| Number of Channels | 8 single-ended or 4 differential | ||||
| Input Ranges | 625 mV, 1.25 V, 2.5 V (unipolar/bipolar) | ||||
| Conversion Time | 372 | 12190 | Hz | Configure via Conversion Time Register | |
| Analog Supply Voltage | 4.75 | 5 | 5.25 | V | Nominal to AGND |
| Operating Temperature | –40 | +105 | °C | ||
| Package Type | 28-TSSOP | ||||
Key Features
- High precision 24-bit Sigma-Delta ADC with true 16-bit p-p resolution achievable in 117 µs conversion time.
- Eight single-ended or four fully differential input channels with programmable gain and signal conditioning options.
- Configurable digital interface supporting 3-wire operation and compatible with microcontrollers and digital signal processors.
- Differential reference input with “No-Reference” detect capability and per-channel system calibration options.
- Schmitt-triggered logic inputs and a reset pin to reset the control logic, interface logic, digital filter, analog modulator, and all on-chip registers.
- Extended industrial temperature range operation from –40°C to +105°C.
Applications
- High-resolution multiplexing applications.
- Industrial process control and automation.
- Automotive systems requiring high precision and reliability.
- Medical devices and diagnostic equipment.
- Data acquisition systems in various fields such as environmental monitoring and scientific research.
Q & A
- What is the resolution of the AD7738BRU ADC?
The AD7738BRU has a 24-bit resolution with true 16-bit p-p resolution achievable in certain configurations.
- How many input channels does the AD7738BRU have?
The AD7738BRU features eight single-ended or four fully differential input channels.
- What are the input voltage ranges for the AD7738BRU?
The input voltage ranges are 625 mV, 1.25 V, and 2.5 V, available in unipolar or bipolar configurations.
- What is the conversion time of the AD7738BRU?
The conversion time can be as low as 117 µs, achieving a throughput of up to 15.4 kHz.
- What is the operating temperature range of the AD7738BRU?
The device operates over an extended industrial temperature range of –40°C to +105°C.
- What type of digital interface does the AD7738BRU support?
The AD7738BRU supports a 3-wire digital interface compatible with microcontrollers and digital signal processors.
- Does the AD7738BRU have any calibration options?
Yes, the AD7738BRU supports per-channel system calibration options.
- What is the package type of the AD7738BRU?
The AD7738BRU is available in a 28-TSSOP package.
- Can the AD7738BRU be used in high-noise environments?
Yes, the device features configurable noise performance and Schmitt-triggered logic inputs to enhance reliability in noisy environments.
- What are some typical applications of the AD7738BRU?
Typical applications include high-resolution multiplexing, industrial process control, automotive systems, medical devices, and data acquisition systems.
