Features and Benefits
- 12-bit SAR ADC with 3 μs conversion time
4 uncommitted analog inputs
VREF, 2 × VREF input ranges
- 2 high-side current sense inputs
5 V to 59.4 V operating range
0.75% maximum gain error
±200 mV input range
- 2 external diode temperature sensor inputs
−55°C to +150°C measurement range
Series resistance cancellation
- 1 internal temperature sensor: ±2°C accuracy
- Built-in monitoring features
Minimum/maximum recorder for each channel
Programmable alert thresholds
- See data sheet for additional features
Product DetailsThe AD7294-2 contains all the functions that are required for general-purpose monitoring and control of current, voltage, and temperature, integrated into a single-chip solution. The part includes low voltage (±200 mV) analog input sense amplifiers for current monitoring across shunt resistors, temperature sense inputs, and four uncommitted analog input channels multiplexed into a SAR analog-to-digital converter (ADC) with a 3 μs conversion time. A high accuracy internal reference is provided to drive both the digital-to-analog converters (DACs) and the ADC. Four 12-bit DACs provide the outputs for voltage control. The AD7294-2 also includes limit registers for alarm functions. The part is designed for high voltage compliance: 59.4 V on the current sense inputs and up to a 15 V DAC output voltage.
The AD7294-2 is a highly integrated solution that offers all the functionality necessary for precise control of the power amplifier in cellular base station applications. In these types of applications, the DACs provide 12-bit resolution to control the bias currents of the power transistors. Thermal diode-based temperature sensors are incorporated to compensate for temperature effects. The ADC monitors the high-side current and temperature. This functionality is provided in a 64-lead TQFP, which operates over a temperature range of −40°C to +105°C.
- Cellular base stations
GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAXM
- Point-to-multipoint and other RF transmission systems
- 12 V, 24 V, 48 V automotive applications
- Industrial controls
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Full details on the AD7294-2 are available in the AD7294-2 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board. Configuration of the various link options is explained in the Evaluation Board Hardware section.
The evaluation board interfaces to the USB port of a PC via the SDP board. Software is available with the evaluation board which allows the user to easily program the AD7294-2.
The kit requires purchasing the controller board for the system demonstration platform ( EVAL-SDP-CB1Z).
SDP-B needs to be ordered with this product. The SDP Controller board is a separate list item in the ordering guide below (EVAL-SDP-CB1Z). If you have not previously purchased an SDP Controller board, please do so to ensure a full evaluation setup.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.