Overview
The AD557JN, produced by Analog Devices Inc., is a low-cost, complete 8-bit digital-to-analog converter (DAC) designed for microcomputer systems. It features an integrated output amplifier and is configured for ease of application, with all reference, output amplifier, and logic connections made internally. The device is calibrated at the factory, ensuring specified accuracy without the need for user trims. It supports both unipolar and bipolar output ranges, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 8 Bits | |||
| Relative Accuracy (0°C to 70°C) | ±1/2 LSB | ±2.5 LSB | ||
| Output Range | 0 V | 2.56 V | V | |
| Output Settling Time | 0.8 µs | 1.5 µs | µs | |
| Full-Scale Accuracy @ 25°C | ±1.5 LSB | ±2.5 LSB | ||
| Zero Error @ 25°C | ±1 LSB | ±3 LSB | ||
| Operating Voltage Range (VCC) | 4.5 V | 5.5 V | V | |
| Current (ICC) | 15 mA | 25 mA | mA | |
| Power Dissipation (VCC = 5 V) | 75 mW | 125 mW | mW | |
| Operating Temperature Range | 0 °C | 70 °C | °C |
Key Features
- 8-bit resolution with relative accuracy of ±1/2 LSB over 0°C to 70°C.
- Output range of 0 V to 2.56 V, with options for bipolar operation.
- Integrated output amplifier and internal calibration trims for specified accuracy without user adjustments.
- Low power consumption with an operating current of 15 mA to 25 mA.
- Fast output settling time of 0.8 µs to 1.5 µs.
- Data input latches controlled by Chip Enable (CE) and Chip Select (CS) inputs for easy interface with microcomputer systems.
- Separate analog and digital grounds to minimize noise and ground drops.
Applications
The AD557JN is suitable for various applications, including:
- Microcomputer systems where digital noise is prevalent.
- Automatic test equipment.
- Instrumentation and measurement systems.
- Digitally controlled calibration systems.
- Systems requiring precise voltage output with minimal user calibration.
Q & A
- What is the resolution of the AD557JN?
The AD557JN has an 8-bit resolution. - What is the output range of the AD557JN?
The output range is 0 V to 2.56 V, with options for bipolar operation. - How is the AD557JN calibrated?
The AD557JN is calibrated at the factory, ensuring specified accuracy without the need for user trims. - What is the operating voltage range of the AD557JN?
The operating voltage range is 4.5 V to 5.5 V. - What is the power consumption of the AD557JN?
The power consumption is 15 mA to 25 mA. - How fast does the output settle in the AD557JN?
The output settling time is 0.8 µs to 1.5 µs. - How are the data inputs controlled in the AD557JN?
The data inputs are controlled by Chip Enable (CE) and Chip Select (CS) inputs. - Why is it important to have separate grounds for the AD557JN?
Separate analog and digital grounds help minimize noise and ground drops, ensuring full rated performance. - What are some common applications of the AD557JN?
Common applications include microcomputer systems, automatic test equipment, instrumentation, and digitally controlled calibration systems. - What is the operating temperature range of the AD557JN?
The operating temperature range is 0°C to 70°C.
