Overview
The AD557JP-REEL7, produced by Analog Devices Inc., is an 8-bit digital-to-analog converter (DAC) designed for low cost and ease of application. This component integrates all necessary reference, output amplifier, and logic connections internally, eliminating the need for user calibration. The AD557 is suitable for use in microcomputer systems and other applications where precision and reliability are crucial.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 8 Bits | |||
| Relative Accuracy (0°C to 70°C) | ±1/2 LSB | |||
| Output Range | 0 to 2.56 V | V | ||
| Current Source | 5 mA Sink | mA | ||
| Output Settling Time | 0.8 µs | 1.5 µs | µs | |
| Full-Scale Accuracy @ 25°C | ±1.5 LSB | ±2.5 LSB | LSB | |
| Zero Error @ 25°C | ±1 LSB | LSB | ||
| Monotonicity | Guaranteed But Not Tested | |||
| Digital Input Voltage (Logic “1”) | 2.0 V | V | ||
| Digital Input Voltage (Logic “0”) | 0 to 0.8 V | V | ||
| Input Capacitance | 4 pF | pF | ||
| Strobe Pulse Width | 225 ns | 300 ns | ns |
Key Features
- Internally configured for low cost and ease of application, with all reference, output amplifier, and logic connections made internally.
- No user calibration required due to precise factory calibration.
- Supports both unipolar (0 V to 2.56 V) and bipolar output ranges.
- Uses eight equally weighted laser-trimmed current sources switched into a silicon-chromium thin-film R/2R resistor ladder network.
- PNP transistors allow direct positive-voltage logic interface and a zero-based output range.
- Low power consumption and high speed, with an output settling time of 0.8 µs to 1.5 µs.
- Separate analog and digital grounds to minimize noise and ground drops.
Applications
- Microcomputer systems where digital noise is prevalent.
- Automatic test equipment.
- Instrumentation and measurement systems.
- Digitally controlled calibration systems.
- Any application requiring precise and reliable digital-to-analog conversion.
Q & A
- What is the resolution of the AD557JP-REEL7? The AD557JP-REEL7 has an 8-bit resolution.
- What are the output ranges supported by the AD557JP-REEL7? The AD557JP-REEL7 supports both unipolar (0 V to 2.56 V) and bipolar output ranges.
- Does the AD557JP-REEL7 require user calibration? No, the AD557JP-REEL7 does not require user calibration due to its precise factory calibration.
- What is the output settling time of the AD557JP-REEL7? The output settling time is between 0.8 µs and 1.5 µs.
- How does the AD557JP-REEL7 handle digital and analog grounds? The AD557JP-REEL7 has separate analog and digital grounds to minimize noise and ground drops.
- What type of transistors are used in the DAC switches of the AD557JP-REEL7? The DAC switches use PNP transistors, allowing direct positive-voltage logic interface and a zero-based output range.
- What is the typical current source capability of the AD557JP-REEL7? The AD557JP-REEL7 has a current source capability of 5 mA sink.
- What is the recommended strobe pulse width for the AD557JP-REEL7? The recommended strobe pulse width is between 225 ns and 300 ns.
- Can the AD557JP-REEL7 be used in microcomputer systems? Yes, the AD557JP-REEL7 is suitable for use in microcomputer systems where digital noise is prevalent.
- What are some common applications of the AD557JP-REEL7? Common applications include automatic test equipment, instrumentation, and digitally controlled calibration systems.
