Overview
The AD7945BRSZ is a high-performance 12-bit multiplying digital-to-analog converter (DAC) produced by Analog Devices Inc. This device is part of the AD7943, AD7945, and AD7948 family, which are designed to operate from a single +5 V supply (Normal Mode) and a single +3.3 V to +5 V supply (Biased Mode). The AD7945 specifically features a 12-bit parallel interface, making it suitable for applications requiring fast and precise analog output control.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 12 | Bits | |
| Relative Accuracy | 0.5 LSBs | VREF = 0 V, DAC Latch Alternately Loaded with All 0s and All 1s | |
| Digital to Analog Glitch Impulse | 60 nV-s typ | VREF = 1.23 V, DAC Register Alternately Loaded with All 0s and All 1s | |
| Multiplying Feedthrough Error | -75 dB max | DAC Latch Loaded with All 0s | |
| Output Capacitance | 60 pF max | All 1s Loaded to DAC | |
| Digital Feedthrough | 5 nV-s typ | Feedthrough to the DAC Output with CS High and Alternate Loading of All 0s and All 1s to the DAC Bus | |
| Total Harmonic Distortion | -83 dB typ | ||
| Output Noise Spectral Density @ 1 kHz | 25 nV/√Hz typ | All 1s Loaded to DAC, VREF = 1.23 V | |
| Power Supply Voltage | +3.3 V to +5 V | Biased Mode Operation | |
| Power Consumption | 5 μW typ | ||
| Interface Type | 12-bit Parallel Interface | ||
| Package Types | 20-lead DIP, 20-lead SOP, 20-lead SSOP |
Key Features
- Fast 12-bit multiplying DAC with a parallel interface
- Operates from a single +5 V supply (Normal Mode) and a single +3.3 V to +5 V supply (Biased Mode)
- Low power consumption: 5 μW typical
- High accuracy: 0.5 LSBs INL and DNL
- Low glitch: 60 nV-s typical with amplifier connected
- Fast settling time: 600 ns to 0.01% with AD843
- R-2R architecture
Applications
- Battery-powered instrumentation
- Laptop computers
- Upgrades for all 754x series DACs (5 V designs)
Q & A
- What is the resolution of the AD7945BRSZ DAC?
The AD7945BRSZ has a resolution of 12 bits. - What are the typical power consumption and supply voltage ranges for the AD7945BRSZ?
The typical power consumption is 5 μW, and the supply voltage range is +3.3 V to +5 V. - What type of interface does the AD7945BRSZ use?
The AD7945BRSZ uses a 12-bit parallel interface. - What are the package options available for the AD7945BRSZ?
The AD7945BRSZ is available in 20-lead DIP, 20-lead SOP, and 20-lead SSOP packages. - What is the digital to analog glitch impulse of the AD7945BRSZ?
The digital to analog glitch impulse is 60 nV-s typical. - What is the total harmonic distortion of the AD7945BRSZ?
The total harmonic distortion is -83 dB typical. - What is the output noise spectral density at 1 kHz for the AD7945BRSZ?
The output noise spectral density at 1 kHz is 25 nV/√Hz typical. - What are some common applications of the AD7945BRSZ?
Common applications include battery-powered instrumentation, laptop computers, and upgrades for all 754x series DACs (5 V designs). - How does the AD7945BRSZ compare to older DAC models like the AD7545?
The AD7945BRSZ offers superior speed and power consumption performance compared to older models like the AD7545. - What is the settling time of the AD7945BRSZ?
The settling time is 600 ns to 0.01% with AD843.
