Overview
The AD7846JN is a 16-bit voltage output Digital-to-Analog Converter (DAC) manufactured by Analog Devices Inc. It is constructed using the LC2MOS process and features VREF+ and VREF− reference inputs along with an on-chip output amplifier. This DAC is designed to provide high accuracy and reliability, making it suitable for various applications requiring precise analog output.
The AD7846JN can be configured for both unipolar and bipolar output ranges, including 0 V to +5 V, 0 V to +10 V, ±5 V, and ±10 V. The device uses a segmented architecture, ensuring 16-bit monotonicity and excellent integral linearity due to the tight matching between the input offset voltages of the buffer amplifiers.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 16 bits | - | - |
| Integral Linearity Error | ±2 LSBs | - | Over temperature |
| Output Range | 0 V to +5 V, 0 V to +10 V, ±5 V, ±10 V | V | Configurable |
| Power Dissipation | 100 mW typical | mW | - |
| Digital Input High Voltage (VIH) | 2.4 V min | V | - |
| Digital Input Low Voltage (VIL) | 0.8 V max | V | - |
| Digital Input Current (IIN) | ±10 μA max | μA | - |
| Digital Input Capacitance (CIN) | 10 pF max | pF | - |
| 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 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 Compatibility: Comprehensive interface with 16 data I/O pins and control lines (CS, R/W, LDAC, and CLR).
- Unipolar or Bipolar Output: Configurable output ranges including 0 V to +5 V, 0 V to +10 V, ±5 V, and ±10 V.
- Multiplying Capability: The DAC can be used in multiplying applications.
- Low Power Consumption: Typical power dissipation of 100 mW.
- Segmented Architecture: Ensures 16-bit monotonicity and excellent integral linearity.
- Package Options: Available in 28-lead plastic, ceramic, and PLCC packages.
Applications
- Closed-Loop Systems: Ideal due to its guaranteed 16-bit monotonicity over temperature.
- Automated Test Equipment (ATE): The readback capability minimizes software routines and enhances functionality in ATE systems.
- Industrial Control Systems: Suitable for applications requiring precise analog output and high reliability.
- Medical Devices: Can be used in medical equipment where accurate and stable analog signals are crucial.
- Aerospace and Defense: Applicable in military and aerospace devices due to its robust specifications and reliability.
Q & A
- What is the resolution of the AD7846JN DAC?
The AD7846JN has a resolution of 16 bits.
- What are the configurable output ranges of the AD7846JN?
The output ranges can be configured to 0 V to +5 V, 0 V to +10 V, ±5 V, and ±10 V.
- What is the typical power dissipation of the AD7846JN?
The typical power dissipation is 100 mW.
- Does the AD7846JN support readback capability?
Yes, it supports readback capability, which is useful in ATE applications.
- What types of packages are available for the AD7846JN?
The AD7846JN is available in 28-lead plastic, ceramic, and PLCC packages.
- What is the integral linearity error of the AD7846JN?
The integral linearity error is ±2 LSBs over temperature.
- Can the AD7846JN be used in closed-loop systems?
Yes, it is ideal for closed-loop systems due to its guaranteed 16-bit monotonicity over temperature.
- What is the purpose of the LDAC line in the AD7846JN?
The LDAC line allows for simultaneous updating of DACs in a multi-DAC system.
- How does the CLR line function in the AD7846JN?
The CLR line resets the contents of the DAC latch to 00…000 or 10…000 depending on the state of R/W, allowing the DAC output to be reset to 0 V.
- What is the significance of the segmented architecture in the AD7846JN?
The segmented architecture ensures 16-bit monotonicity and excellent integral linearity by using a combination of a 16-resistor string and a 12-bit DAC.
