AD7237AQ

Overview

The AD7237AQ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, fabricated in LC2MOS technology. It integrates two independent DACs with on-chip buffered output amplifiers and a Zener voltage reference. The device supports parallel data loading via an 8+4 bit structure for the AD7237A variant, featuring asynchronous LDAC control for simultaneous updates. It operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD and corresponding negative rails. Key static performance metrics include a relative accuracy of ±1/2 LSB max, differential nonlinearity of ±0.9 LSB max, and a typical settling time of 8 µs to within ±1/2 LSB.

Feature Summary

• Dual 12-bit architecture with integrated buffered output amplifiers and internal 5 V reference.
• Parallel interface with double-buffered input latches (8-bit MSB/LSB) and asynchronous LDAC update.
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar).
• LC2MOS process enabling operation from 12 V to 15 V supplies with low power consumption.

Applications

• Industrial process control systems requiring precise multi-channel voltage generation.
• Programmable power supplies and test equipment needing stable analog outputs.
• Microprocessor-based instrumentation utilizing 8-bit or 16-bit data buses.

Procurement Notes

Verify the specific suffix 'Q' indicates the ceramic DIP package option as per the ordering guide. Confirm temperature range requirements, as the 'A' prefix denotes industrial grade (-40°C to +85°C). Ensure supply voltage tolerances match the component version, as A versions allow ±10% tolerance while B/T versions require ±5%. Check for RoHS compliance status if lead-free soldering is required for assembly.

Selection Notes

Select the AD7237A variant when interfacing with microprocessors having 8-bit data buses due to its double-buffered latch structure. Choose the bipolar ±5 V configuration if negative output swings are necessary, requiring dual supplies. Ensure the load impedance meets the amplifier's capability, typically 2 kΩ, to maintain specified settling times. Verify that the system reference voltage aligns with the internal 5 V reference or external REF IN requirements.

Part Context

The AD7237A is an enhanced version of the industry-standard AD7237, offering improved interface speeds and wider supply voltage operation. It belongs to the DACPORT series, which combines precision analog circuits with CMOS logic on a single monolithic chip. The AQ designation specifically refers to the hermetic ceramic dual-in-line package variant, suitable for high-reliability applications compared to plastic or SOIC options.

Replacement Considerations

The AD7237ABQ is a direct pin-compatible replacement with tighter accuracy specifications (±1/2 LSB relative accuracy vs ±1 LSB for the A version). The AD7247A offers a simpler 12-bit parallel interface but lacks the double-buffered latch structure of the AD7237A. Both share the same package and electrical supply characteristics.