Overview
The AD7545AKR is a monolithic 12-bit CMOS multiplying Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. It features onboard data latches and is designed for single supply operation, making it suitable for applications with wide temperature variations. The device can operate with supply voltages ranging from +5 V to +15 V and interfaces directly with most 12- and 16-bit bus systems. The AD7545AKR is known for its low power consumption, dissipating less than 0.5 mW at VDD = +5 V, and its compatibility with CMOS logic levels at the inputs.
Key Specifications
| Parameter | Value | Units | Conditions |
|---|---|---|---|
| Resolution | 12 | Bits | - |
| Relative Accuracy | ±1/2 LSB max | - | K, B, T Versions |
| Differential Nonlinearity | ±1 LSB max | - | All Grades |
| Supply Voltage | +5 V to +15 V | V | - |
| Power Consumption | < 0.5 mW | mW | VDD = +5 V |
| Input High Voltage | 2.4 V min | V | - |
| Input Low Voltage | 0.8 V max | V | - |
| Write Pulse Width | 250 ns min | ns | - |
| Chip Select to Write Setup Time | 280 ns min | ns | - |
Key Features
- Monolithic 12-bit CMOS multiplying DAC with onboard data latches.
- Direct interface to most 12- and 16-bit bus systems.
- Single supply operation from +5 V to +15 V.
- Low power consumption: less than 0.5 mW at VDD = +5 V.
- Fast TTL compatible data latches.
- Transparent input latches when CS and WR inputs are low.
- Constant input impedance at the VREF terminal.
- Suitable for applications with wide temperature variations.
Applications
The AD7545AKR is versatile and can be used in a variety of applications, including:
- Battery-operated equipment due to its low power consumption.
- Unipolar and bipolar circuits as shown in the datasheet figures.
- Microprocessor interfacing for both 8-bit and 16-bit systems.
- Systems requiring high accuracy and stability over a wide temperature range.
- Industrial control systems and data acquisition systems.
Q & A
- What is the resolution of the AD7545AKR?
The AD7545AKR has a resolution of 12 bits.
- What is the supply voltage range for the AD7545AKR?
The supply voltage range is from +5 V to +15 V.
- How much power does the AD7545AKR consume at VDD = +5 V?
The device consumes less than 0.5 mW at VDD = +5 V.
- Can the AD7545AKR interface directly with microprocessors?
- What are the typical operating temperature ranges for the AD7545AKR?
The temperature ranges vary by version: K, L Versions = 0°C to +70°C; B, C Versions = –25°C to +85°C; T, U Versions = –55°C to +125°C.
- How does the AD7545AKR handle invalid data during a write cycle?
Invalid data can be avoided by retiming the write pulse (WR) to ensure it only occurs when data is valid.
- What measures can be taken to minimize digital glitches?
Digital glitches can be minimized by screening the analog pins from the digital pins and ensuring the power supply is free from digitally induced noise.
- Can the AD7545AKR be used in bipolar circuits?
- What is the gain temperature coefficient of the AD7545AKR?
The gain temperature coefficient has a maximum value of 5 ppm/°C and a typical value of 2 ppm/°C.
- How does the input impedance at the VREF terminal behave?
The input impedance at the VREF terminal is constant, allowing it to be driven by a reference voltage or current without the need for buffering.
