Overview
The AD7945BR-REEL is a +3.3 V/+5 V multiplying 12-bit Digital-to-Analog Converter (DAC) produced by Analog Devices, Inc. This device is part of the AD7943, AD7945, and AD7948 series, which are designed to offer superior speed and power consumption performance compared to their predecessors. The AD7945 features a 12-bit parallel interface, making it suitable for applications requiring high precision and fast data transfer.
Key Specifications
| Parameter | Value | Units | Comments |
|---|---|---|---|
| Resolution | 12 | Bits | |
| Number of Channels | 1 | ||
| Interface | Parallel | ||
| Operating Temperature Range | -40 to 85 | °C | |
| Power (typ) | 25 µW | ||
| Settling Time (typ) | 600 ns | To 0.01% with AD843 | |
| INL/DNL | ±0.5 LSB | ||
| Digital Feedthrough | 5 nV-s | Typical | |
| Total Harmonic Distortion | -83 dB | Typical | |
| Output Noise Spectral Density @ 1 kHz | 35 nV/√Hz | Typical, VREF = 0 V |
Key Features
- 12-bit multiplying DAC with high precision and low power consumption.
- Operates from a single +5 V supply (Normal Mode) and a single +3.3 V to +5 V supply (Biased Mode).
- Fast interface with a 40 ns write pulsewidth.
- Low glitch impulse of 60 nV-s with amplifier connected.
- Fast settling time of 600 ns to 0.01% with AD843.
- Available in 20-pin DIP, 20-pin SOP, and 20-pin SSOP packages.
- Supports both offset binary and straight binary data input formats.
Applications
- Battery-powered instrumentation.
- Laptop computers.
- Upgrades for all 754x series DACs (5 V designs).
Q & A
- What is the resolution of the AD7945BR-REEL?
The AD7945BR-REEL has a resolution of 12 bits.
- What types of interfaces does the AD7945 support?
The AD7945 supports a 12-bit parallel interface.
- What is the typical power consumption of the AD7945BR-REEL?
The typical power consumption is 25 µW.
- What is the settling time of the AD7945BR-REEL?
The settling time is typically 600 ns to 0.01% with AD843.
- What are the available package types for the AD7945BR-REEL?
The device is available in 20-pin DIP, 20-pin SOP, and 20-pin SSOP packages.
- What is the operating temperature range of the AD7945BR-REEL?
The operating temperature range is -40°C to 85°C.
- What is the typical digital feedthrough of the AD7945BR-REEL?
The typical digital feedthrough is 5 nV-s.
- What is the total harmonic distortion of the AD7945BR-REEL?
The total harmonic distortion is typically -83 dB.
- What is the output noise spectral density of the AD7945BR-REEL at 1 kHz?
The output noise spectral density at 1 kHz is typically 35 nV/√Hz.
- In what applications is the AD7945BR-REEL commonly used?
The AD7945BR-REEL is commonly used in battery-powered instrumentation, laptop computers, and as upgrades for all 754x series DACs (5 V designs).
