Overview
The AD7291BCPZ, produced by Analog Devices Inc., is an 8-channel, 12-bit Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) with an integrated temperature sensor. This device operates from a single 3.3 V power supply and features an I2C-compatible interface, supporting both standard and fast I2C modes. The AD7291 is designed for applications requiring high accuracy and flexibility, including the ability to handle frequencies up to 30 MHz through its track-and-hold amplifier.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Resolution | 12-bit |
| Conversion Interface | I2C (Standard and Fast Modes) |
| Power Supply | 3.3 V |
| Package Type | 20-Lead LFCSP (4mm x 4mm w/ EP) |
| Temperature Sensor Resolution | 0.25°C |
| Maximum Input Frequency | 30 MHz |
| On-chip Reference | 2.5 V (can be disabled for external reference) |
Key Features
- Programmable Sequencer: Allows selection of a preprogrammable sequence of channels for conversion.
- On-chip Limit Registers: Can be programmed with high and low limits; an out-of-range indicator output (ALERT) becomes active when limits are violated.
- High Accuracy Temperature Sensor: Monitored and digitized by the 12-bit ADC.
- Power Management: Normally remains in a partial power-down state while not converting, powering up only for conversions.
- Command and Autocycle Modes: Conversions can be controlled via I2C write operations or through software-controlled autocycle mode.
Applications
The AD7291BCPZ is suitable for a variety of applications, including:
- Industrial Automation: For monitoring multiple analog signals in industrial environments.
- Medical Devices: Where precise temperature and analog signal measurement are critical.
- Aerospace and Defense: The AD7291-EP version supports defense and aerospace applications, adhering to AQEC standards.
- Automotive Systems: For various sensor readings and control systems in vehicles.
Q & A
- What is the resolution of the AD7291BCPZ ADC?
The AD7291BCPZ has a 12-bit resolution. - What type of interface does the AD7291BCPZ use?
The device uses an I2C-compatible interface, supporting both standard and fast modes. - What is the power supply requirement for the AD7291BCPZ?
The device operates from a single 3.3 V power supply. - Does the AD7291BCPZ have an integrated temperature sensor?
Yes, it includes a high accuracy band gap temperature sensor with a resolution of 0.25°C. - Can the AD7291BCPZ handle high-frequency inputs?
Yes, the track-and-hold amplifier can handle frequencies up to 30 MHz. - What is the purpose of the ALERT output in the AD7291BCPZ?
The ALERT output becomes active when the conversion result violates the programmed high or low limits set in the on-chip limit registers. - How does the AD7291BCPZ manage power consumption?
The device normally remains in a partial power-down state while not converting and powers up only for conversions. - Is the AD7291BCPZ suitable for aerospace and defense applications?
Yes, the AD7291-EP version supports defense and aerospace applications, adhering to AQEC standards. - What is the package type of the AD7291BCPZ?
The device is packaged in a 20-Lead LFCSP (4mm x 4mm w/ EP). - Can the on-chip reference of the AD7291BCPZ be disabled?
Yes, the 2.5 V on-chip reference can be disabled to allow the use of an external reference.
