SBAA631 January   2025 DAC80508 , INA592 , XTR111 , XTR300 , XTR305

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Analog Output Module Specification
  6. 3Analog Output Module Structure
  7. 4Multi-Channel Output Architectures
    1. 4.1 Fully Integrated DAC Architecture
    2. 4.2 Low Voltage DAC Plus an Output Buffer
    3. 4.3 Track and Hold Multiplexed Output
  8. 5Single-Channel Output Architectures
    1. 5.1 Fully Integrated DAC
    2. 5.2 Low-Voltage DAC Plus an Output Buffer
    3. 5.3 Pulse-Width Modulation Plus a Buffer
  9. 6Output Buffers
    1. 6.1 Unidirectional Current Buffer
    2. 6.2 Bidirectional Current Buffer
    3. 6.3 Voltage Buffer
    4. 6.4 Combined Voltage or Current Buffer
  10. 7Summary
  11. 8References

5 Single-Channel Output Architectures

When only a single-channel output is required, as in the case of channel-to-channel isolated modules, there are three options similar to the multi-channel case, although not exactly, and also different devices of choice.

  1. Fully integrated DAC: this approach offers the smallest area and possibly the highest performance for the highest cost per channel as this approach requires high voltage DAC.
  2. Low-voltage DAC plus an output buffer: this approach provides scalability and flexibility in choosing the DAC and the buffer features at lower cost than the integrated design.
  3. Pulse-width modulation (PWM DAC) plus a buffer: this approach offers the lowest cost per channel but has longer settling time, and higher noise than the other implementations.
Table 5-1 Single-Channel AOUT Architectures
Fully Integrated DACVoltage DAC+ Buffer StagePWM DAC + Buffer
Block diagram
FeaturesHigh integration, accuracy, smaller area but Higher cost per channelLower cost, and can achieve higher drive and faster settling.Lowest cost per channel, but slower settling and higher noise
DevicesDAC8760, DAC7760, DAC8750AFE882H1/201, DAC80501, DAC70501, DAC60501MSPM0L, MSPM0G