Overview
The AD7846KN is a 16-bit voltage output Digital-to-Analog Converter (DAC) manufactured by Analog Devices Inc. It is constructed using the LC2MOS process, which ensures high accuracy and reliability. The device features VREF+ and VREF– reference inputs and an on-chip output amplifier, allowing for both unipolar and bipolar output configurations. The AD7846KN is designed for applications requiring high precision and monotonicity over temperature, making it ideal for closed-loop systems and Automated Test Equipment (ATE) applications.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 16 | Bits | |
| Unipolar Output Range | 0 V to +5 V, 0 V to +10 V | VREF– = 0 V | |
| Bipolar Output Range | ±5 V, ±10 V | VREF– = –5 V | |
| Integral Linearity Error | ±2 LSB (typ), ±16 LSB (max) | @ +25°C, TMIN to TMAX | |
| Differential Nonlinearity Error | ±1 LSB (typ), ±0.5 LSB (max) | ||
| Offset Error | ±12 LSB (typ), ±16 LSB (max) | @ +25°C, TMIN to TMAX | |
| Gain Error | ±12 LSB (typ), ±16 LSB (max) | @ +25°C, TMIN to TMAX | |
| Power Dissipation | 100 mW (typ) | ||
| VDD (Analog Supply) | +11.4 V to +15.75 V | ||
| VSS (Analog Supply) | –14.25 V to –15.75 V | ||
| VCC (Digital Supply) | +4.75 V to +5.25 V |
Key Features
- 16-Bit Monotonicity: Guaranteed monotonicity over temperature, making it ideal for closed-loop applications.
- Readback Capability: Ability to read back the DAC register contents, useful in ATE applications.
- Microprocessor Interface: Comprehensive interface with 16 data I/O pins and control lines (CS, R/W, LDAC, and CLR) for writing, reading, and resetting the DAC.
- Segmented Architecture: Uses a segmented architecture with a 16-resistor string and 12-bit DAC for high resolution and accuracy.
- Low Power Consumption: Typical power dissipation of 100 mW.
- Multiple Output Ranges: Configurable for unipolar (0 V to +5 V, 0 V to +10 V) and bipolar (±5 V, ±10 V) output ranges.
- Packaging Options: Available in 28-lead plastic, ceramic, and PLCC packages.
Applications
- Closed-Loop Systems: Ideal for applications requiring high precision and monotonicity over temperature.
- Automated Test Equipment (ATE): The readback function is particularly useful in ATE systems.
- Industrial Control Systems: Suitable for precision control in industrial environments.
- Medical Devices: High accuracy and reliability make it suitable for medical equipment.
- Aerospace and Defense: Used in military and aerospace applications due to its high performance and reliability.
Q & A
- What is the resolution of the AD7846KN DAC?
The AD7846KN has a resolution of 16 bits.
- What are the possible output ranges for the AD7846KN?
The AD7846KN can be configured for unipolar output ranges (0 V to +5 V, 0 V to +10 V) and bipolar output ranges (±5 V, ±10 V).
- What is the significance of the segmented architecture in the AD7846KN?
The segmented architecture ensures 16-bit monotonicity and excellent integral linearity by using a 16-resistor string and a 12-bit DAC.
- What is the power dissipation of the AD7846KN?
The typical power dissipation of the AD7846KN is 100 mW.
- What is the readback function in the AD7846KN, and where is it useful?
The readback function allows reading back the DAC register contents, which is particularly useful in Automated Test Equipment (ATE) applications.
- What are the supply voltage ranges for the AD7846KN?
The AD7846KN requires an analog supply (VDD) of +11.4 V to +15.75 V, an analog negative supply (VSS) of –14.25 V to –15.75 V, and a digital supply (VCC) of +4.75 V to +5.25 V.
- In what packages is the AD7846KN available?
The AD7846KN is available in 28-lead plastic, ceramic, and PLCC packages.
- What are some common applications of the AD7846KN?
The AD7846KN is commonly used in closed-loop systems, ATE, industrial control systems, medical devices, and aerospace and defense applications.
- How does the AD7846KN ensure high accuracy and reliability?
The AD7846KN ensures high accuracy and reliability through its segmented architecture, tight matching between buffer amplifiers, and comprehensive microprocessor interface.
- What is the significance of the LDAC and CLR lines in the AD7846KN?
The LDAC line allows simultaneous updating of DACs in a multi-DAC system, and the CLR line resets the contents of the DAC latch to a predefined state, enabling the DAC output to be reset to 0 V in both unipolar and bipolar configurations.
