AD7245JPZ

Overview

The AD7245JPZ is a 12-bit monolithic digital-to-analog converter (DAC) from Analog Devices, part of the DACPORT family. It integrates a voltage output amplifier and an internal 5 V buried Zener reference on a single CMOS 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. Key electrical specifications include a settling time of 7 µs to within ±1/2 LSB, a typical power dissipation of 450 mW, and a maximum operating temperature of +85°C. It features parallel data loading and buffered voltage outputs.

Feature Summary

• 12-bit resolution with R-2R architecture and integrated output buffer amplifier
• Internal 5 V low-noise buried Zener diode reference requiring no external trimming
• Parallel interface with double-buffered logic and asynchronous LDAC control
• Extended industrial temperature range operation from -40°C to +85°C

Applications

• Microprocessor-controlled analog signal generation
• Industrial process control systems requiring precise voltage references
• Test and measurement equipment needing stable DAC outputs
• Programmable power supplies and instrumentation amplifiers

Procurement Notes

Verify the specific suffix 'JPZ' against the manufacturer's ordering guide, as standard commercial grades typically utilize suffixes like 'AN', 'ABN', or 'AR'. Confirm package type compatibility, as 'J' often denotes a ceramic DIP variant while 'P' may indicate PLCC. Ensure supply voltage requirements (+10.8 V to +16.5 V) align with system design constraints before procurement.

Selection Notes

Select this component when a high-speed, 12-bit DAC with an integrated reference and buffer is required. It is suitable for applications demanding ±1/2 LSB linearity and fast settling times. Consider the parallel interface requirements and ensure the microprocessor can handle the 30 ns data setup time. Verify that the available packages (DIP/SOIC/PLCC) fit the PCB layout constraints.

Part Context

The AD7245A/AD7248A series represents an enhanced version of industry-standard DACs, offering improved interface speeds and extended temperature ranges. The AD7245A specifically uses an 8+4 bit parallel loading structure, distinguishing it from the AD7248A which uses an 8-bit bus loaded in two steps. This family utilizes LC2MOS technology for precision bipolar circuits combined with low-power CMOS logic.

Replacement Considerations

Direct replacements include other AD7245A variants such as AD7245ABRZ or AD7245AARZ depending on the required accuracy grade (±1/2 LSB vs ±3/4 LSB) and package type (SOIC vs PDIP). Ensure the substitute maintains the same supply voltage range and pinout configuration.