Overview
The AD7538KNZ is a 14-bit monolithic CMOS digital-to-analog converter (DAC) produced by Analog Devices Inc. This device utilizes laser-trimmed thin-film resistors to achieve excellent linearity. It is designed to be compatible with most microprocessors and accepts TTL or CMOS logic level inputs. The AD7538KNZ is part of the LC2MOS family, known for its linear-compatible CMOS process, which ensures high accuracy and reliability. The DAC can be loaded with a single 14-bit wide word using standard chip select and memory write logic, and it features double buffering, allowing for simultaneous updates in systems with multiple AD7538s.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Bits | 14 | |
| Package Type | 24-DIP (0.300", 7.62mm) | |
| Supply Voltage (VDD) | 11.4 V to 15.75 V | V |
| Settling Time | 1.5 μs | μs |
| Integral Nonlinearity (INL) | 1 LSB | LSB |
| Operating Temperature Range (Commercial) | 0°C to +70°C | °C |
| Operating Temperature Range (Industrial) | -25°C to +85°C | °C |
| Power Dissipation | 1000 mW (to 75°C), derates 10 mW/°C above 75°C | mW |
Key Features
- Guaranteed Monotonicity: The AD7538KNZ is guaranteed monotonic to 14 bits over the full temperature range for all grades.
- Low Cost: Offers a low-cost solution for 12-bit system upgrades with its 14-bit dynamic range.
- Small Package Size: Available in a small 24-pin DIP and 24-pin SOIC packages.
- Low Output Leakage: Features a novel low leakage configuration, enabling excellent output leakage current characteristics over the specified temperature range.
- Wide Power Supply Tolerance: Operates with a +12 V to +15 V VDD, with a ±5% tolerance on this nominal figure.
- Double Buffering: Allows simultaneous updates in systems containing multiple AD7538s using the LDAC feature.
Applications
- Digital Audio: Suitable for applications requiring high precision and linearity in digital audio systems.
- Precision Servo Control: Used in control and measurement systems that require precise analog outputs.
- High Temperature Environments: Ideal for control and measurement in high temperature environments due to its robust temperature range.
- Microprocessor Interfacing: Designed for easy interfacing with 16-bit microprocessors, reducing the need for external logic.
Q & A
- What is the resolution of the AD7538KNZ DAC?
The AD7538KNZ is a 14-bit digital-to-analog converter.
- What are the package options for the AD7538KNZ?
The AD7538KNZ is available in a 24-pin DIP and 24-pin SOIC packages.
- What is the supply voltage range for the AD7538KNZ?
The supply voltage range is from 11.4 V to 15.75 V.
- What is the settling time of the AD7538KNZ?
The settling time is 1.5 μs.
- Is the AD7538KNZ guaranteed to be monotonic?
Yes, the AD7538KNZ is guaranteed monotonic to 14 bits over the full temperature range for all grades.
- What is the operating temperature range for the AD7538KNZ?
The commercial version operates from 0°C to +70°C, and the industrial version from -25°C to +85°C.
- Does the AD7538KNZ support double buffering?
Yes, the AD7538KNZ supports double buffering using the LDAC feature.
- What is the power dissipation of the AD7538KNZ?
The power dissipation is 1000 mW (to 75°C), derating 10 mW/°C above 75°C).
- Is the AD7538KNZ compatible with microprocessors?
Yes, it is designed for easy interfacing with 16-bit microprocessors and accepts TTL or CMOS logic level inputs).
- What is the significance of the LC2MOS process in the AD7538KNZ?
The LC2MOS process ensures linear-compatible CMOS performance, which is crucial for high accuracy and reliability).
