Overview
The AD7291TCPZ-EP-RL7 is a highly integrated, 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This device is designed to operate from a single 3.3 V power supply and features an I2C-compatible interface, making it versatile for various applications. The AD7291-EP includes a 9-channel multiplexer and a track-and-hold amplifier capable of handling frequencies up to 30 MHz. It also incorporates an on-chip 2.5 V reference that can be disabled to allow the use of an external reference. The device is particularly notable for its high accuracy band gap temperature sensor, which is monitored and digitized by the 12-bit ADC, providing a temperature resolution of 0.25°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VDD | 2.8 V | 3.6 V | V | ||
| VDRIVE | 1.65 V | 3.6 V | V | ||
| fSCL | 400 kHz | kHz | Fast SCLK mode | ||
| VREF | 2.5 V | V | Internal/External | ||
| Signal-to-Noise Ratio (SNR) | 70 dB | 71 dB | dB | fIN = 1 kHz sine wave | |
| Signal-to-Noise + Distortion Ratio (SINAD) | 70 dB | 71 dB | dB | fIN = 1 kHz sine wave | |
| Total Harmonic Distortion (THD) | -84 dB | -78 dB | dB | fIN = 1 kHz sine wave | |
| Spurious-Free Dynamic Range (SFDR) | -85 dB | -80 dB | dB | fIN = 1 kHz sine wave | |
| Intermodulation Distortion (IMD) | dB | fIN = 1 kHz sine wave | |||
| Temperature Range | -55°C | 125°C | °C | ||
| Package | 20-Lead LFCSP (4mm x 4mm w/ EP) |
Key Features
- 8-Channel ADC: The device features eight single-ended analog inputs that are multiplexed into the on-chip track-and-hold amplifier, each capable of accepting analog inputs from 0 V to 2.5 V.
- I2C Interface: Supports standard and fast I2C interface modes, allowing for flexible communication protocols.
- Internal Temperature Sensor: A high accuracy band gap temperature sensor monitored and digitized by the 12-bit ADC, providing a temperature resolution of 0.25°C.
- Programmable Sequencer: Enables the selection of a preprogrammable sequence of channels for conversion, enhancing operational flexibility.
- On-Chip Limit Registers: Can be programmed with high and low limits for the conversion results; an out-of-range indicator output (ALERT) becomes active when the programmed limits are violated.
- Low Power Consumption: The device normally remains in a partial power-down state while not converting and powers up for conversions, optimizing power usage.
Applications
- Industrial Automation: Suitable for monitoring and control systems due to its multiple analog input channels and temperature sensing capabilities.
- Medical Devices: Can be used in medical equipment requiring precise analog-to-digital conversion and temperature monitoring.
- Aerospace and Defense: Compliant with AQEC standards, making it suitable for defense and aerospace applications.
- Automotive Systems: Applicable in automotive systems that require robust and accurate analog-to-digital conversion and temperature sensing).
Q & A
- What is the AD7291TCPZ-EP-RL7?
The AD7291TCPZ-EP-RL7 is an 8-channel, 12-bit SAR ADC with an internal temperature sensor, manufactured by Analog Devices Inc..
- What is the power supply requirement for the AD7291TCPZ-EP-RL7?
The device operates from a single 3.3 V power supply).
- What type of interface does the AD7291TCPZ-EP-RL7 support?
The device supports an I2C-compatible interface, including standard and fast I2C modes).
- What is the resolution of the temperature sensor in the AD7291TCPZ-EP-RL7?
The temperature sensor has a resolution of 0.25°C).
- Can the AD7291TCPZ-EP-RL7 use an external reference voltage?
Yes, the on-chip 2.5 V reference can be disabled to allow the use of an external reference voltage).
- What is the input bandwidth of the track-and-hold amplifier in the AD7291TCPZ-EP-RL7?
The track-and-hold amplifier can handle frequencies up to 30 MHz).
- Does the AD7291TCPZ-EP-RL7 have any power-saving features?
Yes, the device normally remains in a partial power-down state while not converting and powers up for conversions).
- What is the package type of the AD7291TCPZ-EP-RL7?
The device is packaged in a 20-Lead LFCSP (4mm x 4mm w/ EP)).
- Is the AD7291TCPZ-EP-RL7 suitable for aerospace and defense applications?
Yes, it is compliant with AQEC standards, making it suitable for defense and aerospace applications).
- How can the conversion process be controlled in the AD7291TCPZ-EP-RL7?
The conversion process can be controlled by a command mode or an autocycle mode selected through software control).
