ADI AD7237ATQ

For procurement teams sourcing the AD7237ATQ, the CERDIP package and A-grade linearity specification are the two defining characteristics. Hermetic ceramic construction provides reliability beyond plastic DIP packaging in applications with humidity cycling, temperature extremes within the industrial range, or long service life requirements — without the MIL-STD-883B qualification overhead of the 883B military variant. The A-grade ±½ LSB linearity specification sets the accuracy floor for both DAC channels, and the complete on-chip integration — reference, output amplifiers, reference buffer — means no external precision components are required to meet the datasheet specifications straight from qualified stock.

AD7237ATQ Architecture: Dual DAC With Byte Loading and REF OUT/REF IN

The byte loading interface of the AD7237ATQ addresses the practical constraint of connecting to 8-bit processor buses without a 16-bit data path. Twelve bits of DAC data load in two 8-bit writes — four MSBs in the upper byte (with four don’t-care bits), eight LSBs in the lower byte — using separate CS_A and CS_B chip selects for each channel. The asynchronous LDAC then transfers both input registers to the DAC registers simultaneously, updating both analog outputs at the same instant. The REF OUT/REF IN architecture provides a useful flexibility point: the on-chip 5V reference is available at REF OUT for external use, and the reference buffer amplifier that drives the DAC core accepts either the on-chip reference or an external reference at REF IN without requiring the on-chip reference to be disconnected. For designs where the internal reference drift is insufficient, an external precision reference such as the 5962-9078501MLA AD780S provides 3 ppm/°C maximum drift in the same procurement ecosystem.

AD7237ATQ vs AD7237A Family: Package and Qualification Selection

The AD7237A family spans plastic DIP, SOIC, and CERDIP package options across commercial and military qualification tiers:

The AD7237ATQ is the correct choice when ceramic hermetic packaging is required within the industrial temperature range without MIL-STD-883B qualification overhead. For military programs requiring –55°C to +125°C operation and full qualification documentation, the AD7237ATQ/883B under SMD 5962-90785 02MLA is the procurement path. Note that the AD7247A is the parallel-load version of the same device — it accepts 12-bit data directly rather than through byte loading, making it the better fit for designs with a 12-bit or 16-bit parallel bus available.

Sourcing the ADI AD7237ATQ

The AD7237ATQ in its hermetic CERDIP package maintains consistent demand in industrial and defense-adjacent programs where ceramic packaging is specified without full military qualification. We carry verified inventory with full lot traceability and anti-counterfeit inspection on every order. Contact us today to confirm availability and request a quote — our team responds within 24 hours.

• Dual channel on one die — eliminates matching uncertainty between discrete single-channel DAC components
• Byte loading interface accommodates 8-bit processor buses without a 16-bit data path
• On-chip 5V reference available at REF OUT pin for external signal chain use
• Asynchronous LDAC enables simultaneous update of both channels — eliminates inter-channel timing skew
• Laser-trimmed output amplifiers achieve ±½ LSB A-grade linearity without external adjustment
• CERDIP package provides hermetic sealing without MIL-STD-883B qualification overhead
• Direct upgrade path to military screening via AD7237ATQ/883B without schematic changes
• Full lot traceability and anti-counterfeit inspection on every order

Frequently Asked Questions (FAQ)

What Is the ADI AD7237ATQ and How Does It Differ From the AD7247ATQ?

The AD7237ATQ is the byte-loading variant of the AD7237A dual 12-bit DAC — data loads in two 8-bit writes using a shared 8-bit bus, with an asynchronous LDAC updating both channels simultaneously. The AD7247ATQ is the parallel-loading variant of the same device, accepting 12-bit data directly on a 12-bit parallel bus with a separate CS for each channel. Both share the same die, package, and analog specifications — the difference is the digital interface.

What Is the Difference Between the AD7237ATQ and the AD7237ATQ/883B?

The AD7237ATQ uses the same 24-lead CERDIP package with identical electrical specifications but is rated for –40°C to +85°C industrial operation without MIL-STD-883B qualification documentation. The AD7237ATQ/883B adds MIL-STD-883B processing and screening, extending the temperature rating to –55°C to +125°C with full qualification documentation including lot traceability and certificate of conformance. For programs requiring DoD qualification, the AD7237ATQ/883B under SMD 5962-90785 02MLA is the correct procurement path.

Can the AD7237ATQ Use an External Voltage Reference?

Yes. The REF OUT/REF IN architecture allows the on-chip 5V reference to be bypassed by driving the REF IN pin with an external reference. The reference buffer amplifier isolates the external reference from the on-chip reference — both can coexist without shorting. For applications requiring lower temperature drift than the internal reference provides, external precision references can be connected to REF IN without requiring the internal reference to be disabled.

How Does the Byte Loading Interface Work on the AD7237ATQ?

Data loads into each DAC in two 8-bit writes. The first write loads the upper byte — four MSBs in the upper nibble, with four don’t-care bits — and the second write loads the lower byte with the eight LSBs. Each channel has its own CS input (CS_A for DAC A, CS_B for DAC B), allowing independent loading. When LDAC is taken low, both DAC registers update simultaneously from their respective input registers.

How Do I Request a Quote for the ADI AD7237ATQ?

Submit an inquiry through our website contact form or email our sales team directly. We will respond within 24 hours with pricing, availability, and lead time — and can discuss long-term supply agreements for production programs.