AD7245ATQ

Overview

The AD7245ATQ is a 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates a voltage output amplifier and an internal buried Zener reference on a monolithic chip. The device operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. It features a parallel interface with double-buffered logic, settling times of up to 10 µs, and relative accuracy grades of ±3/4 LSB or ±1/2 LSB. The ATQ variant supports an extended temperature range of –55°C to +125°C and is housed in a 28-lead Cerdip package.

Feature Summary

• 12-bit resolution with integrated output amplifier and internal 5V reference
• Extended industrial temperature range: –55°C to +125°C
• Parallel data interface with asynchronous LDAC and CLR control signals
• Supply voltage range: +10.8 V to +16.5 V (VDD), –10.8 V to –16.5 V (VSS)

Applications

• Industrial process control systems requiring wide temperature operation
• Data acquisition systems with microprocessor interfaces
• Precision instrumentation utilizing single or dual supply configurations

Procurement Notes

Verify the specific linearity grade (±3/4 LSB or ±1/2 LSB) required for the application, as the datasheet lists both variants under the ATQ suffix. Confirm that the 28-lead Cerdip package meets the thermal and mechanical requirements for the target environment. Ensure power supply decoupling follows the recommended schematic to maintain reference stability.

Selection Notes

Select the AD7245ATQ when an extended temperature range down to –55°C is necessary compared to the standard commercial A/B versions. Choose this model over the AD7248A if an 8+4 bit parallel loading structure is preferred over an 8-bit bus interface. Verify that the 10 µs settling time and ±1 LSB DNL specifications meet the system's dynamic performance requirements.

Part Context

The AD7245ATQ belongs to the enhanced AD7245A series, which improves upon the original industry-standard AD7245. Key enhancements include operation from 12 V to 15 V supplies, faster interface setup times, and improved full-scale variations with respect to VDD. The ATQ designation specifically denotes the military-grade temperature extension and Cerdip packaging option within the product lineup.

Replacement Considerations

The AD7245AAQ serves as a direct pin-compatible alternative with a lower commercial temperature range (–40°C to +85°C). For applications requiring an 8-bit wide data bus interface instead of the 12-bit parallel input, the AD7248ATQ is the corresponding functional equivalent.