Overview
Features and Benefits
- Complete Dual 12-Bit DAC Comprising
Two 12-Bit CMOS DACs
On-Chip Voltage Reference
Output Amplifiers
Reference Buffer Amplifiers
- Parallel Loading Structure: AD7247
- (8 + 4) Loading Structure: AD7237
- Single or Dual Supply Operation
- Low Power - 165 mW typ in Single Supply
Product Details
The AD7237A / AD7247A is an enhanced version of the industry standard AD7237 / AD7247. Improvements include operation from 12 V to 15 V supplies, faster interface times and better reference variations with VDD . Additional features include faster settling times.
The AD7237A / AD7247A is a complete, dual, 12-bit, voltage output digital-to-analog converter with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No external user trims are required to achieve full specified performance.
Both parts are microprocessor compatible, with high speed data latches and interface logic. The AD7247A accepts 12-bit parallel data which is loaded into the respective DAC latch using the WR input and a separate Chip Select input for each DAC. The AD7237A has a double buffered interface structure and an 8-bit wide data bus with data loaded to the respective input latch in two write operations. An asynchronous LDAC signal on the AD7237A updates the DAC latches and analog outputs.
A REF OUT/REF IN function is provided which allows either the on-chip 5 V reference or an external reference to be used as a reference voltage for the part. For single supply operation, two output ranges of 0 V to +5 V and 0 V to +10 V are available, while these two ranges plus an additional ±5 V range are available with dual supplies. The output amplifiers are capable of developing +10 V across a 2 k(Ω) load to GND.
The AD7237A / AD7247A is fabricated in Linear Compatible CMOS (LC2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin, 0.3" wide plastic and hermetic dual-in-line package (DIP) and are also packaged in a 24-lead small outline (SOIC) package.
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Tools & Simulations
Precision DAC Error Budget Tool
The Precision DAC Error Budget Tool is a web application that calculates the DC Accuracy of precision DAC signal chains. It shows how the static errors accumulate throughout your signal chain to quickly evaluate the design tradeoffs. Calculations include the DC errors introduced by Voltage References, Operation Amplifiers and Precision DACs.
Design Resources
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD7237AARZ | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237AARZ-REEL | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237AARZ-REEL7 | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237ABRZ | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237ABRZ-REEL | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237AQ | Material Declaration | Reliability Data | 24-Lead CerDIP (Narrow 0.3 Inch) | |
| AD7237ATQ | Material Declaration | Reliability Data | 24-Lead CerDIP (Narrow 0.3 Inch) | |
| AD7237JNZ | Material Declaration | Reliability Data | 24-Lead PDIP | |
| AD7237JRZ | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7237KRZ | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| Wafer Fabrication Data |
PCN-PDN Information
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Lead Times
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Sampling
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