16-bit, octal-channel, ultra-low glitch, voltage output DAC with 2.5V, 2ppm/?C internal reference 16-TSSOP -40 to 125# Technical Datasheet: DAC8568IBPW - 16-Bit, 8-Channel, Ultra-Low Glitch, Voltage-Output DAC
Manufacturer : Texas Instruments / Burr-Brown (TI/BB)
Package : TSSOP-16 (PW)
Ordering Code : DAC8568IBPW
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## 1. Application Scenarios
### Typical Use Cases
The DAC8568IBPW is a precision 16-bit, 8-channel digital-to-analog converter (DAC) designed for applications requiring high channel density, excellent DC accuracy, and minimal output disturbance during updates. Its integrated precision output amplifiers allow each channel to drive a 2 kΩ || 1000 pF load directly.
Primary use cases include:
* Multi-Channel Analog Output Systems: Industrial process control (PLC analog output modules), automated test equipment (ATE), and data acquisition systems (DAQ) where multiple independent voltage references or setpoints are required.
* Closed-Loop Control Systems: Providing setpoint voltages for PID controllers in motor drives, power supply margining, and laser diode biasing. The device's low glitch energy (0.15 nV-s typical) ensures minimal disturbance during control updates.
* Medical Instrumentation: Used in patient monitoring systems, ultrasound machines, and diagnostic equipment for generating precise bias voltages, calibration signals, and waveform synthesis.
* Communications Infrastructure: Base station power amplifier biasing and gain control, where multiple channels and high reliability are critical.
### Industry Applications
* Industrial Automation: PLC analog output modules, valve and actuator control, programmable logic controllers.
* Test & Measurement: Precision signal sources, arbitrary waveform generators, semiconductor test system pin electronics.
* Medical Electronics: Imaging systems (MRI, CT), patient vital sign monitors, therapeutic equipment.
* Telecommunications: Wireless base station remote radio units (RRUs), optical network control.
* Aerospace & Defense: Avionics display systems, radar signal conditioning, flight control simulators.
### Practical Advantages and Limitations
Advantages:
* High Integration: Eight independent DAC channels in a compact TSSOP-16 package reduce board space and component count.
* Exceptional DC Performance: High accuracy with low offset error (±4 mV max) and gain error (±0.1% of FSR max) minimizes calibration overhead.
* Ultra-Low Glitch Energy: 0.15 nV-s typical glitch impulse minimizes transient errors during code changes, crucial for waveform generation and control loops.
* Flexible Power Supply: Operates from a single 2.7 V to 5.5 V supply, compatible with 3.3 V and 5 V digital logic.
* Per-Channel Power-Down: Each channel can be independently powered down to a high-impedance state (~1 MΩ), reducing system power consumption.
Limitations:
* Output Drive Capability: The integrated output amplifier is not designed for high-current loads (>5 mA). Buffering is required for low-impedance or heavy capacitive loads.
* Settling Time: While fast for precision applications (10 µs to ±0.003% FSR), it is not suitable for very high-speed, >100 kHz signal synthesis.
* No Integrated Reference: Requires an external precision voltage reference, adding to the total solution size and cost.
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## 2. Design Considerations
### Common Design Pitfalls and Solutions
1. Pitfall: Reference Voltage Noise Coupling.
* Issue: Noise on the external reference input is directly multiplied at the DAC output, degrading system SNR and accuracy.
* Solution: Use a low-noise, high-precision reference (e.g., REF50xx series). Implement strict filtering (
