Overview
The AD7846BP, produced by Analog Devices Inc., is a 16-bit voltage output Digital-to-Analog Converter (DAC) constructed using the LC2MOS process. This device features VREF+ and VREF− reference inputs along with an on-chip output amplifier, allowing for both unipolar and bipolar output configurations. The AD7846BP is designed for high accuracy and reliability, making it suitable for various precision applications.
Key Specifications
| Parameter | Min/Typ/Max | Unit | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 16 bits | ||
| Output Range | 0 V to +5 V, 0 V to +10 V (unipolar), ±5 V, ±10 V (bipolar) | V | VREF+ and VREF− configurations |
| Integral Linearity Error | ±2 LSBs | Over temperature | |
| Power Supply | VDD: +11.4/+15.75 V, VSS: –11.4/–15.75 V, VCC: +4.75/+5.25 V | V | |
| Power Dissipation | 100 mW (typ) | mW | VOUT unloaded |
| Digital Input High Voltage | 2.4 V (min) | V | |
| Digital Input Low Voltage | 0.8 V (max) | V | |
| Output Resistance | 0.3 Ω (typ) | Ω | To 0 V |
| Short Circuit Current | ±25 mA (typ) | mA | To 0 V or any power supply |
Key Features
- 16-Bit Monotonicity: Guaranteed 16-bit monotonicity over temperature, making it ideal for closed-loop applications.
- Readback Capability: Allows reading back the DAC register contents, useful in Automated Test Equipment (ATE) applications.
- Microprocessor Interface: Comprehensive interface with 16 data I/O pins and control lines (CS, R/W, LDAC, and CLR) for writing and reading from the I/O latch.
- 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 Configurations: Can be configured for unipolar (0 V to +5 V, 0 V to +10 V) or bipolar (±5 V, ±10 V) output ranges.
Applications
- Closed-Loop Systems: Ideal for applications requiring high accuracy and monotonicity, such as control systems and feedback loops.
- Automated Test Equipment (ATE): The readback function is particularly useful in ATE applications for verifying DAC settings.
- Industrial Control Systems: Suitable for precision voltage output in industrial control and automation systems.
- Medical and Scientific Instruments: Used in medical and scientific equipment where precise voltage control is necessary.
Q & A
- What is the resolution of the AD7846BP DAC?
The AD7846BP has a resolution of 16 bits.
- What are the possible output ranges for the AD7846BP?
The AD7846BP can be configured for unipolar output ranges (0 V to +5 V, 0 V to +10 V) or bipolar output ranges (±5 V, ±10 V).
- What is the integral linearity error of the AD7846BP?
The integral linearity error is ±2 LSBs over temperature.
- Does the AD7846BP support readback functionality?
Yes, the AD7846BP supports readback capability, allowing the contents of the DAC register to be read back.
- What is the typical power dissipation of the AD7846BP?
The typical power dissipation is 100 mW.
- What types of packages are available for the AD7846BP?
The AD7846BP is available in 28-lead plastic, ceramic, and PLCC packages.
- How does the segmented architecture of the AD7846BP contribute to its performance?
The segmented architecture ensures 16-bit monotonicity and excellent integral linearity by using a 16-resistor string and a 12-bit DAC.
- What are the power supply requirements for the AD7846BP?
The power supply requirements are VDD: +11.4/+15.75 V, VSS: –11.4/–15.75 V, and VCC: +4.75/+5.25 V.
- Can the AD7846BP be used in multi-DAC systems?
Yes, the LDAC line allows for simultaneous updating of DACs in a multi-DAC system.
- How can the DAC output be reset to 0 V?
The CLR line can reset the contents of the DAC latch to 00…000 or 10…000, depending on the state of R/W, resetting the DAC output to 0 V in both unipolar and bipolar configurations.
