Overview
The AD7225LR, 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 AD7225LR is designed to optimize board space and enhance system reliability by integrating multiple converters and amplifiers on a single chip. Although the AD7225LR is currently obsolete and no longer manufactured, it remains a significant example of advanced DAC technology.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of DACs | 4 |
| Resolution | 8-bit |
| Output Type | Voltage Output |
| Reference Input Voltage Range | 2 V to 12.5 V (dual supply), 10 V (single supply) |
| Output Buffer Amplifier Capability | 10 V across a 2 kΩ load |
| Interface Logic Compatibility | TTL and CMOS (5 V) level compatible |
| Control Inputs | A0, A1, WR (Active Low), LDAC |
| Power Supply | VDD (Positive), VSS (Negative) |
| Package Types | 28-lead PLCC, SSOP |
Key Features
- Single-Chip Design: Integrates four 8-bit DACs and output buffer amplifiers, reducing board space and increasing reliability.
- Separate Reference Inputs: Each DAC has its own reference input terminal, allowing for flexible input signal handling.
- Single- or Dual-Supply Operation: Supports both single-supply and dual-supply configurations, enhancing performance in various applications.
- Double-Buffered Interface Logic: Allows simultaneous update of all four outputs under the control of the LDAC signal.
- High-Speed CMOS Process: Fabricated using an all ion-implanted, high-speed, linear-compatible CMOS (LC2MOS) process.
Applications
The AD7225LR is suitable for a variety of applications requiring multiple DAC channels, such as industrial control systems, medical devices, audio equipment, and any system needing precise analog output control. Its versatility in reference input voltages and dual-supply operation makes it adaptable to different system requirements.
Q & A
- What is the resolution of each DAC in the AD7225LR? Each DAC in the AD7225LR has an 8-bit resolution.
- How many DAC channels does the AD7225LR have? The AD7225LR has four independent DAC channels.
- What is the range of the reference input voltage for the AD7225LR? The reference input voltage range is from 2 V to 12.5 V for dual-supply operation and 10 V for single-supply operation.
- Is the AD7225LR compatible with TTL and CMOS logic levels? Yes, the AD7225LR is compatible with both TTL and CMOS (5 V) logic levels.
- What is the capability of the output buffer amplifiers in the AD7225LR? Each output buffer amplifier can develop 10 V across a 2 kΩ load.
- Can the AD7225LR be used in single-supply or dual-supply configurations? Yes, the AD7225LR supports both single-supply and dual-supply configurations.
- What is the purpose of the LDAC signal in the AD7225LR? The LDAC signal allows for the simultaneous update of all four DAC outputs.
- Why is the AD7225LR obsolete? The AD7225LR is no longer manufactured by Analog Devices Inc. and has been replaced by other models or substitutes.
- What are some common applications for the AD7225LR? Common applications include industrial control systems, medical devices, and audio equipment.
- What type of CMOS process is used in the fabrication of the AD7225LR? The AD7225LR is fabricated using an all ion-implanted, high-speed, linear-compatible CMOS (LC2MOS) process.
