Overview
The AD7226KR, produced by Analog Devices Inc., is a quad 8-bit voltage-output digital-to-analog converter (DAC) integrated into a single monolithic chip. This device includes four 8-bit DACs, each with an output buffer amplifier and interface logic, eliminating the need for external trims to achieve full specified performance. The AD7226KR is fabricated using an all ion-implanted high speed Linear Compatible CMOS (LC2MOS) process, allowing for the integration of high-speed digital logic and precision analog circuits on the same chip.
Key Specifications
| Parameter | Unit | Conditions/Comments |
|---|---|---|
| Resolution | 8 Bits | |
| Total Unadjusted Error | ±1 LSB max | VDD = 15 V ± 5%, VREF = 10 V |
| Relative Accuracy | ±0.5 LSB max | |
| Differential Nonlinearity | ±0.5 LSB max | |
| Reference Voltage Range | 2 V to 12.5 V | Dual supplies |
| Output Current | Up to 5 mA | |
| Supply Voltage | VDD = 11.4 V to 16.5 V, VSS = –5 V ± 10% | |
| Package Types | 20-Lead DIP, SOIC, SSOP, PLCC |
Key Features
- DAC-to-DAC Matching: Precise matching and tracking between the DACs due to fabrication on the same chip.
- Single-Supply Operation: The voltage mode configuration allows operation from a single power supply rail.
- Microprocessor Compatibility: Common 8-bit data bus with individual DAC latches, compatible with most 8-bit microprocessors.
- Compact Design: Combines four DACs, four op amps, and interface logic into a 20-pin package, reducing board space requirements.
- No User Trims: No external trims required to achieve full specified performance.
- Extended Temperature Range Operation: Specified performance over an extended temperature range.
Applications
- Process Control: Used in systems requiring precise analog output control.
- Automatic Test Equipment: Ideal for automated testing and calibration.
- Automatic Calibration of Large System Parameters: Such as gain and offset adjustments.
Q & A
- What is the resolution of the AD7226KR DACs?
The AD7226KR has four 8-bit DACs.
- What is the maximum output current of each DAC?
Each DAC can drive up to 5 mA of output current.
- Can the AD7226KR operate on a single supply?
- What is the reference voltage range for the AD7226KR?
The reference voltage range is from 2 V to 12.5 V with dual supplies.
- Is the AD7226KR compatible with microprocessors?
- What are the package options for the AD7226KR?
The AD7226KR is available in 20-Lead DIP, SOIC, SSOP, and PLCC packages.
- Does the AD7226KR require external trims for full performance?
No, the AD7226KR does not require external trims to achieve full specified performance.
- What is the fabrication process of the AD7226KR?
The AD7226KR is fabricated using an all ion-implanted high speed Linear Compatible CMOS (LC2MOS) process.
- What are some typical applications of the AD7226KR?
Typical applications include process control, automatic test equipment, and automatic calibration of large system parameters.
- How does the DAC-to-DAC matching in the AD7226KR benefit its performance?
The precise matching and tracking between the DACs, due to their fabrication on the same chip, enhance the overall performance and accuracy of the device.
