Overview
The AD7225KNZ, 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 independent DAC channels, each with its own reference input terminal, output buffer amplifiers, and interface logic. The AD7225KNZ is fabricated using an all ion-implanted, high-speed Linear Compatible CMOS (LC2MOS) process, which integrates high-speed digital logic and precision analog circuitry. This design allows for a significant reduction in board space and enhanced reliability in systems requiring multiple converters.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of DACs | 4 |
| Resolution | 8-bit |
| Output Type | Voltage - Buffered |
| Reference Type | External |
| Settling Time | 4µs |
| Data Interface | Parallel |
| Supply Voltage (Analog) | +2V to +12.5V (dual supply), +10V (single supply) |
| Output Voltage Range | Up to 10V across a 2 kΩ load |
| Logic Compatibility | TTL and CMOS (5V) level compatible |
| Package Options | 24-Lead PDIP, 24-Lead SOIC (Wide), 28-Lead PLCC |
Key Features
- Separate Reference Inputs: Each DAC has its own reference input terminal, allowing for flexible operation with variable input voltage capabilities.
- Double-Buffered Interface Logic: The device includes two 8-bit registers per channel (input register and DAC register), enabling simultaneous update of all four outputs under control of the LDAC signal.
- Single- or Dual-Supply Operation: The AD7225KNZ can operate with either single or dual supplies, offering enhanced performance in certain configurations.
- High-Speed CMOS Process: Fabricated using an all ion-implanted, high-speed LC2MOS process, integrating high-speed digital logic and precision analog circuitry on the same chip.
- Optimized Pinout: The pinout is designed to optimize board layout, with all analog inputs and outputs at one end and all digital inputs at the other.
Applications
The AD7225KNZ is suitable for a variety of applications that require multiple precision DACs, such as:
- Industrial Control Systems: Where precise voltage outputs are necessary for controlling various industrial processes.
- Medical Devices: For applications requiring accurate voltage outputs, such as in medical imaging and diagnostic equipment.
- Aerospace and Defense: In systems that demand high reliability and precision, such as in navigation and communication systems.
- Automotive Systems: For applications like engine control, safety systems, and other automotive electronics that require precise analog outputs.
Q & A
- What is the resolution of the AD7225KNZ DACs?
The AD7225KNZ has 8-bit resolution for each of its four DAC channels.
- What types of supply voltages can the AD7225KNZ operate with?
The device can operate with either single or dual supplies, with specified performance for input reference voltages from +2V to +12.5V and a single supply of +10V.
- What is the settling time of the AD7225KNZ?
The settling time of the AD7225KNZ is 4µs.
- Does the AD7225KNZ require external trims for full performance?
No, the AD7225KNZ does not require external trims to achieve full specified performance.
- What is the output voltage range of the AD7225KNZ?
Each output buffer amplifier can develop up to 10V across a 2 kΩ load.
- Is the AD7225KNZ compatible with TTL and CMOS logic?
Yes, the AD7225KNZ is TTL and CMOS (5V) level compatible.
- What are the package options available for the AD7225KNZ?
The device is available in 24-Lead PDIP, 24-Lead SOIC (Wide), and 28-Lead PLCC packages.
- How does the double-buffered interface logic work?
The double-buffered interface logic includes two 8-bit registers per channel (input register and DAC register), allowing simultaneous update of all four outputs under control of the LDAC signal.
- What is the significance of separate reference inputs for each DAC?
The separate reference inputs provide flexibility in dealing with input signals, allowing variable input voltage capabilities for each DAC.
- Is the AD7225KNZ suitable for high-speed applications?
Yes, the device is fabricated using a high-speed LC2MOS process, making it suitable for high-speed applications.
