Overview
The AD7945BN is a 12-bit multiplying Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. It operates from a single +3.3 V to +5 V supply, making it versatile for various applications. This DAC features a 12-bit parallel interface, which facilitates fast and efficient data transfer. The AD7945BN is designed to replace industry-standard DACs like the AD7545, offering superior speed and power consumption performance.
Key Specifications
| Parameter | Description | Value (VDD = +3 V to +3.6 V) | Value (VDD = +4.5 V to +5.5 V) |
|---|---|---|---|
| Resolution | Number of bits | 12 bits | 12 bits |
| Supply Voltage | Operating voltage range | +3.3 V to +5 V | +3.3 V to +5 V |
| Integral Nonlinearity (INL) | Maximum deviation from ideal transfer function | 0.5 LSBs | 0.5 LSBs |
| Differential Nonlinearity (DNL) | Maximum deviation between two consecutive output levels | 0.5 LSBs | 0.5 LSBs |
| Power Consumption | Typical power consumption | 5 μW | 5 μW |
| Write Pulsewidth | Minimum write pulsewidth | 60 ns | 40 ns |
| Data Setup Time | Minimum data setup time | 45 ns | 30 ns |
| Data Hold Time | Minimum data hold time | 10 ns | 10 ns |
| Settling Time | Time to settle to 0.01% of final value | 600 ns | 600 ns |
| Digital Feedthrough | Typical digital feedthrough | 5 nV-s | 5 nV-s |
Key Features
- Fast Interface: The AD7945BN features a 12-bit parallel interface, enabling fast data transfer and efficient operation.
- Low Power Consumption: It consumes a typical power of 5 μW, making it suitable for battery-powered and low-power applications.
- High Accuracy: The DAC has a guaranteed INL and DNL of 0.5 LSBs, ensuring high accuracy in digital-to-analog conversion.
- Low Glitch and Fast Settling: It has a low glitch of 60 nV-s and settles to 0.01% of the final value in 600 ns, which is beneficial for applications requiring quick and precise analog output.
- Multiple Package Options: Available in 20-pin DIP, 20-pin SOP, and 20-pin SSOP packages, providing flexibility in design and implementation.
Applications
- Battery-Powered Instrumentation: Suitable for devices that require low power consumption and high accuracy.
- Laptop Computers: Can be used in laptop computers for various analog output requirements.
- Upgrades for Legacy DACs: Designed to replace industry-standard DACs like the AD7545, making it a viable upgrade option for existing designs.
Q & A
- What is the resolution of the AD7945BN DAC?
The AD7945BN has a resolution of 12 bits.
- What is the operating voltage range of the AD7945BN?
The AD7945BN operates from a single +3.3 V to +5 V supply.
- What is the typical power consumption of the AD7945BN?
The typical power consumption is 5 μW.
- What is the settling time of the AD7945BN?
The settling time to 0.01% of the final value is 600 ns.
- What types of interfaces does the AD7945BN support?
The AD7945BN supports a 12-bit parallel interface.
- What are the package options available for the AD7945BN?
It is available in 20-pin DIP, 20-pin SOP, and 20-pin SSOP packages.
- What is the digital feedthrough of the AD7945BN?
The typical digital feedthrough is 5 nV-s.
- What is the integral nonlinearity (INL) of the AD7945BN?
The guaranteed INL is 0.5 LSBs.
- What is the differential nonlinearity (DNL) of the AD7945BN?
The guaranteed DNL is 0.5 LSBs.
- What are some common applications of the AD7945BN?
Common applications include battery-powered instrumentation, laptop computers, and upgrades for legacy DACs.
