Overview
The AD7945BRZ is a high-performance 12-bit multiplying Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This component operates from a single +5 V supply in Normal Mode and from a single +3.3 V to +5 V supply in Biased Mode. It features a 12-bit parallel interface, making it suitable for applications requiring fast and precise analog output generation.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 12 bits | ||
| Supply Voltage | +3.3 V to +5 V | V | Normal and Biased Mode |
| Settling Time | 600 ns (typ) | ns | To 0.01% with AD843 |
| Digital Interface | Parallel (12-bit) | ||
| Output Type | Current - Unbuffered | ||
| Differential Output | No | ||
| Power Consumption | 5 μW (typ) | μW | |
| Integral Nonlinearity (INL) | 0.5 LSBs (max) | LSBs | |
| Differential Nonlinearity (DNL) | 0.5 LSBs (max) | LSBs | |
| Digital Feedthrough | 5 nV-s (typ) | nV-s | With CS High and Alternate Loading of All 0s and All 1s |
| Output Noise Spectral Density | 25 nV/√Hz (typ) @ 1 kHz | nV/√Hz | VREF = 1.23 V |
Key Features
- Fast 12-bit multiplying DAC with low power consumption (5 μW typical)
- Operates from a single +5 V supply (Normal Mode) and a single +3.3 V to +5 V supply (Biased Mode)
- 12-bit parallel interface for high-speed data transfer
- Low glitch impulse (60 nV-s typical) and fast settling time (600 ns to 0.01% with AD843)
- Low integral and differential nonlinearity (0.5 LSBs maximum)
- Available in various packages including 20-lead DIP, 20-lead SOP, and 20-lead SSOP
Applications
- Battery-powered instrumentation
- Laptop computers
- Upgrades for all 754x series DACs (5 V designs)
- General industrial and commercial applications requiring high-speed and low-power DACs
Q & A
- What is the resolution of the AD7945BRZ DAC?
The AD7945BRZ has a resolution of 12 bits. - What are the supply voltage options for the AD7945BRZ?
The AD7945BRZ operates from a single +5 V supply in Normal Mode and from a single +3.3 V to +5 V supply in Biased Mode. - What type of digital interface does the AD7945BRZ use?
The AD7945BRZ uses a 12-bit parallel interface. - What is the typical settling time of the AD7945BRZ?
The typical settling time is 600 ns to 0.01% with AD843. - What is the power consumption of the AD7945BRZ?
The power consumption is typically 5 μW. - What are the package options available for the AD7945BRZ?
The AD7945BRZ is available in 20-lead DIP, 20-lead SOP, and 20-lead SSOP packages. - What are some common applications of the AD7945BRZ?
Common applications include battery-powered instrumentation, laptop computers, and upgrades for all 754x series DACs. - How does the AD7945BRZ compare to older DAC models?
The AD7945BRZ offers superior speed and power consumption performance compared to the industry-standard AD7545 and AD7548. - What is the digital feedthrough of the AD7945BRZ?
The digital feedthrough is typically 5 nV-s with CS high and alternate loading of all 0s and all 1s. - What is the output noise spectral density of the AD7945BRZ?
The output noise spectral density is typically 25 nV/√Hz at 1 kHz with VREF = 1.23 V.
