Overview
The AD7945ARS-B is a high-precision, 12-bit multiplying Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This component is part of the AD7943, AD7945, and AD7948 series, which are designed to operate from single +3.3 V to +5 V supplies. The AD7945 specifically features a 12-bit parallel interface, making it suitable for applications requiring fast and accurate analog output.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 12 bits | ||
| Supply Voltage Range | 3.3 V to 5.5 V | V | Normal and Biased Modes |
| Power Consumption (Typical) | 5 µA | µA | VINH = VDD – 0.1 V, VINL = 0.1 V, SRO Open Circuit, No STB Signal |
| Integral Nonlinearity (INL) | 0.5 LSBs | LSBs | |
| Differential Nonlinearity (DNL) | 0.5 LSBs | LSBs | |
| Settling Time | 600 ns to 0.01% | ns | With AD843 Amplifier Connected |
| Write Pulsewidth | 40 ns | ns | |
| Data Setup Time | 10 ns | ns | |
| Data Hold Time | 10 ns | ns | |
| Package Options | 20-lead DIP, 20-lead SOP, 20-lead SSOP |
Key Features
- 12-bit resolution with monotonic behavior over temperature
- Parallel 12-bit interface for fast data transfer
- Low power consumption: typically 5 µA
- Fast settling time: 600 ns to 0.01% with AD843 amplifier connected
- Low glitch: 60 nV-s with amplifier connected
- Double-buffered input logic for reduced digital feedthrough
- High precision output with guaranteed specifications over +3.3 V to +5 V supply range
- Available in 20-lead DIP, SOP, and SSOP packages
Applications
- Battery-powered instrumentation
- Laptop computers
- Upgrades for all 754x series DACs (5 V designs)
- Any application requiring high precision, low power, and fast settling time DACs
Q & A
- What is the resolution of the AD7945ARS-B DAC?
The AD7945ARS-B has a 12-bit resolution. - What are the supply voltage options for the AD7945ARS-B?
The AD7945ARS-B can operate from a single +3.3 V to +5 V supply. - What is the typical power consumption of the AD7945ARS-B?
The typical power consumption is 5 µA. - What is the settling time of the AD7945ARS-B?
The settling time is 600 ns to 0.01% with an AD843 amplifier connected. - What types of interfaces does the AD7945ARS-B support?
The AD7945ARS-B supports a 12-bit parallel interface. - What are the package options available for the AD7945ARS-B?
The AD7945ARS-B is available in 20-lead DIP, SOP, and SSOP packages. - Is the AD7945ARS-B suitable for battery-powered devices?
Yes, it is suitable due to its low power consumption. - What is the glitch performance of the AD7945ARS-B?
The glitch performance is 60 nV-s with an amplifier connected. - Can the AD7945ARS-B replace older DAC models?
Yes, it can replace industry-standard AD7543, AD7545, and AD7548 in many applications. - What is the data setup and hold time for the AD7945ARS-B?
The data setup time is 10 ns, and the data hold time is 10 ns.
