Overview
The AD7226KR-REEL, 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 features 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 AD7226 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 Capability | Up to 5 mA | |
| Supply Voltage Range | VDD = 11.4 V to 16.5 V, VSS = –5 V ± 10% | |
| Operating Temperature Range | TMIN to TMAX (specified in datasheet) | |
| 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.
- Small Size: 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 a wide temperature range.
Applications
- Process Control: Suitable for precise control in industrial processes.
- Automatic Test Equipment: Used in automated testing systems for calibration and measurement.
- Automatic Calibration of Large System Parameters: Ideal for adjusting gain and offset in complex systems.
Q & A
- What is the resolution of the AD7226 DACs?
The AD7226 features four 8-bit DACs.
- What is the reference voltage range for the AD7226?
The reference voltage range is from 2 V to 12.5 V with dual supplies and up to 10 V for single supply operation.
- Can the AD7226 operate from a single power supply?
Yes, the AD7226 can operate from a single power supply rail.
- What is the output current capability of each DAC?
Each DAC can drive up to 5 mA of output current.
- Is the AD7226 compatible with microprocessors?
Yes, it has a common 8-bit data bus with individual DAC latches, making it compatible with most 8-bit microprocessors.
- What are the package options for the AD7226?
The AD7226 is available in 20-Lead DIP, SOIC, SSOP, and PLCC packages.
- Does the AD7226 require external trims for performance?
No, the AD7226 does not require external trims to achieve full specified performance.
- What is the operating temperature range for the AD7226?
The operating temperature range is specified in the datasheet as TMIN to TMAX.
- What are some typical applications of the AD7226?
Typical applications include process control, automatic test equipment, and automatic calibration of large system parameters.
- How does the AD7226 achieve precise DAC-to-DAC matching?
The precise matching is inherent due to the fabrication of all four DACs on the same chip at the same time.
