Overview
The AD7224LNZ, produced by Analog Devices Inc., is a precision 8-bit, voltage-output, digital-to-analog converter (DAC) integrated on a monolithic CMOS chip. This device features an output amplifier and double-buffered interface logic, eliminating the need for external trims to achieve full specified performance. The AD7224 is fabricated using an all ion-implanted high-speed Linear Compatible CMOS (LC2MOS) process, enabling the integration of high-speed digital logic and precision analog circuits on the same chip.
Key Specifications
| Parameter | Units | Conditions/Comments |
|---|---|---|
| Resolution | 8 Bits | |
| Total Unadjusted Error | ±2 LSB max | VDD = +15 V ± 5%, VREF = +10 V |
| Relative Accuracy | ±1/2 LSB max | |
| Differential Nonlinearity | ±1 LSB max | |
| Full-Scale Error | ±3/2 LSB max | |
| Full-Scale Temperature Coefficient | ±20 ppm/°C max | |
| Reference Voltage Range | +2 V to +12.5 V (dual supply), +10 V (single supply) | |
| Output Amplifier Capability | +10 V across a 2 kΩ load | |
| Logic Input Compatibility | TTL and CMOS (5 V) level compatible |
Key Features
- Double Buffered Interface Logic: The AD7224 features two 8-bit registers—an input register and a DAC register—allowing for simultaneous updates in systems with multiple AD7224s.
- No External Trims Required: Achieves full specified performance without the need for external trims.
- High-Speed CMOS Process: Fabricated using an all ion-implanted high-speed Linear Compatible CMOS (LC2MOS) process.
- Output Amplifier: The voltage-mode D/A converter output is buffered by a unity gain noninverting CMOS amplifier capable of developing +10 V across a 2 kΩ load.
- Logic Input Compatibility: Compatible with TTL and 5 V CMOS logic levels.
- Control Logic: Control signals are level-triggered, and the RESET line functions as a zero override when both registers are transparent.
Applications
- Industrial Control Systems: Suitable for applications requiring precise analog output control.
- Medical Devices: Used in medical equipment where accurate voltage output is crucial.
- Aerospace and Defense: Applicable in systems requiring high reliability and precision.
- Automotive Systems: Can be used in automotive control systems for precise voltage control.
- Test and Measurement Equipment: Ideal for equipment that requires accurate and stable analog outputs.
Q & A
- What is the resolution of the AD7224?
The AD7224 has a resolution of 8 bits.
- What is the total unadjusted error of the AD7224?
The total unadjusted error is ±2 LSB max.
- What is the reference voltage range for the AD7224?
The reference voltage range is from +2 V to +12.5 V for dual supply operation and +10 V for single supply operation.
- What is the capability of the output amplifier in the AD7224?
The output amplifier can develop +10 V across a 2 kΩ load.
- Is the AD7224 compatible with TTL and CMOS logic levels?
- What is the purpose of the double buffered interface logic in the AD7224?
The double buffered interface logic allows for simultaneous updates in systems with multiple AD7224s.
- Do I need external trims to achieve full specified performance with the AD7224?
No, external trims are not required to achieve full specified performance.
- What is the significance of the LC2MOS process used in the AD7224?
The LC2MOS process allows for the integration of high-speed digital logic and precision analog circuits on the same chip.
- How does the RESET line function when both registers are transparent?
The RESET line functions as a zero override when both registers are transparent.
- What are some typical applications of the AD7224?
The AD7224 is typically used in industrial control systems, medical devices, aerospace and defense, automotive systems, and test and measurement equipment.
