Overview
The AD7226KRS, produced by Analog Devices Inc., is a quad 8-bit voltage-output digital-to-analog converter (DAC) integrated on 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 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 | Value | 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 | Measured Value – Zero Code Error – Ideal Value | ||
| Reference Voltage Range | 2 V to 12.5 V | Dual supplies | |
| Output Current | Up to 5 mA | Per DAC | |
| Package Types | 20-Lead DIP, SOIC, SSOP, PLCC |
Key Features
- Four 8-bit DACs with output buffer amplifiers on a single chip.
- No external trims required for full specified performance.
- Microprocessor-compatible with a common 8-bit TTL/CMOS (5 V) compatible input port.
- Single-supply operation possible with a reference voltage of 10 V.
- DAC-to-DAC matching due to fabrication on the same chip.
- Small size with a 20-pin package, optimizing board layout.
- Laser-trimmed amplifiers eliminating the need for offset nulling.
Applications
- Process Control
- Automatic Test Equipment
- Automatic Calibration of large system parameters (e.g., gain/offset)
Q & A
- What is the resolution of the AD7226 DACs?
The AD7226 has a resolution of 8 bits for each of the four DACs.
- Do the AD7226 DACs require external trims for full performance?
No, the AD7226 does not require external trims to achieve full specified performance.
- What is the reference voltage range for the AD7226?
The reference voltage range for the AD7226 is from 2 V to 12.5 V with dual supplies and 10 V for single supply operation.
- How much output current can each DAC drive?
Each DAC can drive up to 5 mA of output current.
- What package types are available for the AD7226?
The AD7226 is available in 20-Lead DIP, SOIC, SSOP, and PLCC packages.
- Is the AD7226 compatible with microprocessors?
- What is the fabrication process of the AD7226?
The AD7226 is fabricated using an all ion-implanted high speed Linear Compatible CMOS (LC2MOS) process.
- What are some typical applications of the AD7226?
The AD7226 is typically used in process control, automatic test equipment, and automatic calibration of large system parameters.
- How does the DAC-to-DAC matching work in the AD7226?
The DAC-to-DAC matching is inherent because all four DACs are fabricated on the same chip at the same time.
- Can the AD7226 operate on a single power supply?
