Overview
The AD7846KNZ 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 can be configured to provide unipolar output ranges (0 V to +5 V, 0 V to +10 V) or bipolar output ranges (±5 V, ±10 V). The device uses a segmented architecture to ensure 16-bit monotonicity and excellent integral linearity, making it suitable for high-accuracy 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 | - |
| Power Dissipation | 100 mW | mW | - |
| VDD | +11.4/+15.75 | V | Min/Max |
| VSS | 0 V | V | - |
| VIH (Input High Voltage) | 2.4 V | V | Min |
| VIL (Input Low Voltage) | 0.8 V | V | Max |
| IIN (Input Current) | ±10 μA | μA | Max |
| CIN (Input Capacitance) | 10 pF | pF | Max |
| VOL (Output Low Voltage) | 0.4 V | V | Max, ISINK = 1.6 mA |
| VOH (Output High Voltage) | 4.0 V | V | Min, ISOURCE = 400 μA |
Key Features
- 16-Bit Monotonicity: Guaranteed 16-bit monotonicity over temperature, ideal for closed-loop applications.
- Readback Function: Ability to read back the DAC register contents, useful in Automated Test Equipment (ATE) systems.
- Low Power Dissipation: Power dissipation of 100 mW, making it the lowest power, high accuracy DAC on the market.
- Comprehensive Microprocessor Interface: Includes 16 data I/O pins and control lines (CS, R/W, LDAC, and CLR) for writing to and reading from the I/O latch.
- Segmented Architecture: Uses a segmented architecture with a 16-resistor string and buffer amplifiers to ensure high accuracy and linearity.
- Multiple Package Options: Available in 28-lead plastic, ceramic, and PLCC packages.
Applications
- Automated Test Equipment (ATE): The readback function and high accuracy make it suitable for ATE applications.
- Closed-Loop Systems: Ideal for closed-loop applications due to its guaranteed 16-bit monotonicity over temperature.
- Industrial Control Systems: Used in industrial control systems where high precision and reliability are required.
- Medical Devices: Suitable for medical devices that require precise voltage output and low power consumption.
Q & A
- What is the resolution of the AD7846KNZ DAC?
The AD7846KNZ has a resolution of 16 bits.
- What are the possible output ranges for the AD7846KNZ?
The AD7846KNZ 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 power dissipation of the AD7846KNZ?
The power dissipation of the AD7846KNZ is 100 mW.
- What is the purpose of the readback function in the AD7846KNZ?
The readback function allows reading back the DAC register contents, which is useful in Automated Test Equipment (ATE) systems.
- How does the AD7846KNZ ensure high accuracy and linearity?
The AD7846KNZ uses a segmented architecture with a 16-resistor string and buffer amplifiers to ensure high accuracy and linearity.
- What are the package options available for the AD7846KNZ?
The AD7846KNZ is available in 28-lead plastic, ceramic, and PLCC packages.
- What is the typical output resistance of the AD7846KNZ?
The typical output resistance of the AD7846KNZ is 0.3 Ω.
- What is the maximum input current for the AD7846KNZ?
The maximum input current for the AD7846KNZ is ±10 μA.
- What is the maximum input capacitance for the AD7846KNZ?
The maximum input capacitance for the AD7846KNZ is 10 pF.
- Can the AD7846KNZ be reset to 0 V in both unipolar and bipolar configurations?
