Overview
The AD667JP-REEL, produced by Analog Devices Inc., is a microprocessor-compatible 12-bit digital-to-analog converter (DAC). This device integrates a high stability buried Zener voltage reference and double-buffered input latches on a single chip. The AD667 is designed for high performance and accuracy, utilizing 12 precision high-speed bipolar current steering switches and a laser-trimmed thin-film resistor network. This configuration ensures fast settling times and high accuracy, making it suitable for a wide range of applications requiring precise analog output.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits |
| Logic Levels (TTL Compatible) | ||||
| VIH (Logic '1') | +2.0 | +5.5 | V | |
| VIL (Logic '0') | 0 | +0.8 | V | |
| IIH (VIH = 5.5 V) | 3 | 10 | µA | |
| IIL (VIL = 0.8 V) | 1 | 5 | µA | |
| Temperature Range | 0 | +70 | °C | |
| Linearity Error (K Grade) | ±1/4 LSB | |||
| Linearity Error (J Grade) | ±1/2 LSB | |||
| Settling Time | 2 | 4 | µs | |
| Package Type | 28-Pin PLCC (P) |
Key Features
- High Accuracy and Linearity: The AD667 features ±1/4 LSB maximum linearity error for K grades and ±1/2 LSB for J grades at +25°C, ensuring high accuracy in analog output.
- Double-Buffered Latches: The device includes double-buffered input latches, allowing direct interface to 4-, 8-, 12-, or 16-bit microprocessor buses and preventing spurious analog output values.
- High Stability Voltage Reference: A subsurface (buried) Zener diode provides a low noise voltage reference with long-term stability and temperature drift characteristics comparable to the best discrete reference diodes.
- Fast Settling Time: The AD667 has a settling time of 2 to 4 microseconds, making it suitable for high-speed applications.
- Microprocessor Compatibility: The device is designed to be compatible with various microprocessors, with latch responses to strobe pulses as short as 100 ns.
Applications
- Industrial Control Systems: The AD667 is suitable for industrial control systems that require precise analog outputs for control and monitoring purposes.
- Medical Equipment: Its high accuracy and stability make it a good fit for medical equipment where precise voltage outputs are critical.
- Aerospace and Defense: The device's performance over a wide temperature range and its availability in hermetically sealed packages make it suitable for aerospace and defense applications.
- Automotive Systems: The AD667 can be used in automotive systems that require reliable and accurate analog outputs.
Q & A
- What is the resolution of the AD667JP-REEL?
The AD667JP-REEL has a resolution of 12 bits.
- What types of packages are available for the AD667?
The AD667 is available in 28-pin molded plastic DIP (N), PLCC (P), and ceramic DIP (D) packages.
- What is the temperature range for the AD667JP grade?
The AD667JP grade is specified for use over the 0°C to +70°C temperature range.
- How does the double-buffered latch structure work?
The double-buffered latch structure allows data to be loaded into the first rank of latches and then transferred to the second rank, avoiding spurious analog output values.
- What is the settling time of the AD667?
The settling time of the AD667 is typically 2 to 4 microseconds.
- Is the AD667 compatible with various microprocessor buses?
Yes, the AD667 is compatible with 4-, 8-, 12-, or 16-bit microprocessor buses.
- What type of voltage reference does the AD667 use?
The AD667 uses a high stability buried Zener voltage reference.
- What are the logic levels for the AD667?
The logic levels are TTL compatible, with VIH (Logic '1') greater than 2.0 V and VIL (Logic '0') less than 0.8 V).
- Is the AD667 suitable for high-speed applications?
Yes, the AD667 is suitable for high-speed applications due to its fast settling time and response to short strobe pulses).
- What is the linearity error for the AD667JP grade?
The linearity error for the AD667JP grade is ±1/4 LSB maximum at +25°C).
