LTC2688
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LTC2688

16-Channel, 12-/16-Bit Voltage Output SoftSpan DAC

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 14
1ku List Price Starting From $24.93
Features
  • 16 independent SoftSpan DACs
  • Independently programmable output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, ±15 V
  • Full 12-/16-bit resolution at all ranges
  • Flexible single- or dual-supply operation
  • Maximum INL error: ±3 LSB16, ±0.75 LSB12
  • Precision 4.096 V reference, ±5 ppm/°C maximum
  • A/B toggle or sinusoidal dither using up to 3 toggle pins
  • Multiplexer for output voltage and load current sense
  • Outputs drive ±20 mA guaranteed
  • 6 mm × 6 mm, 40-lead LFCSP and 4.5 mm × 4.5 mm, 64-ball WLCSP
Additional Details
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The LTC2688 is a 16-channel,12-/16-bit, ±15 V digital-to-analog converter (DAC) with an integrated precision reference. The LTC2688 is guaranteed monotonic and has built in rail-to-rail output buffers that can source or sink up to 20 mA. This SoftSpan DAC offers five output ranges up to ±15 V. The range of each channel is independently programmable.

The internal 4.096 V precision reference sets the accuracy of the output voltage. An external reference can be used for additional range options. Three toggle pins support Input Register A and Input Register B toggle or sinusoidal dither at multiple frequencies. An analog multiplexer simplifies measurement of pin voltages, load currents, and junction temperature.

Programmable offset and gain registers improve the accuracy of the DAC outputs.

The serial peripheral interface (SPI) and MICROWIRE-compatible, 3-wire serial interface operates on logic levels as low as 1.71 V and clock rates up to 50 MHz.

APPLICATIONS

  • Optical networking
  • Instrumentation
  • Data acquisition
  • Automatic test equipment
  • Process control and industrial automation
Part Models 14
1ku List Price Starting From $24.93

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC2688CUJ-12#PBF
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LTC2688CUJ-12#TRPBF
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LTC2688CUJ-16#PBF
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LTC2688CUJ-16#TRPBF
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LTC2688HCB-12#TRPBF
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LTC2688HCB-16#TRPBF
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LTC2688HUJ-12#PBF
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LTC2688HUJ-12#TRPBF
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LTC2688HUJ-16#PBF
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LTC2688HUJ-16#TRPBF
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LTC2688IUJ-12#PBF
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LTC2688IUJ-12#TRPBF
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LTC2688IUJ-16#PBF
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LTC2688IUJ-16#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 1

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DC2873A

LTC2688 Demo Board | 16-Channel, 16-Bit Voltage Output SoftSpan DAC

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DC2873A

LTC2688 Demo Board | 16-Channel, 16-Bit Voltage Output SoftSpan DAC

LTC2688 Demo Board | 16-Channel, 16-Bit Voltage Output SoftSpan DAC

Features and Benefits

  • Fully featured evaluation board for the LTC2688 multichannel voltage output DAC
  • Flexible output power supply configuration
  • Easy connection to external loads
  • Test points to monitor DAC status signals
  • ACE evaluation software compatible

Product Detail

The DC2873A-B and the DC2873A-C, hereafter referred to as the DC2873A, are fully featured evaluation boards used to evaluate the LTC2688, a 16-channel, 16-bit or 12-bit precision voltage output digital-to-analog converter (DAC).

The DC2873A-B is populated with the 16-bit version of the LTC2688 (LTC2688-16), and the DC2873A-C (LTC2688-12) is populated with the 12-bit version of the LTC2688.

The DC2873A is controlled through a serial peripheral interface (SPI) from the J1 connector. The SPI signals are sent from the DC2026C controller board through the ribbon cable that is connected to the DC2873A.

The DC2873A uses Analysis, Control, Evaluation (ACE) software to provide an intuitive graphical user interface (GUI) that configures and controls the LTC2688 using the SPI interface.

The LTC2688 is used for various voltage mode biasing applications such as optical modulators for data communications. The output voltage range for each channel is software selectable, and any channel can be routed to the DC2873A MUX pin, allowing either the channel voltage or current to be externally monitored.

For full specifications on the LTC2688-16 and LTC2688-12, see the LTC2688 data sheet, which must be consulted in conjunction with the user guide when using the DC2873A.

Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Reference Designs

Reference Designs 1

Figure 1. CN0554 Simplified Block Diagram

±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

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CN0554

±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

CN0554

Circuits from the lab

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±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

Features and Benefits

  • 8-Psuedo differential inputs or 16-Single-ended inputs
  • Selectable Input Voltage range, up to ±13 V
  • 16 Single-ended Outputs
  • Up to ±15 V Outputs
  • All Power Rails Derived from the Raspberry Pi
View Detailed Reference Design external link

Design & Integration Tools

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Videos

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Feb 17, 2023

01:00

CN0554: 10V Analog Input and 15V Analog Output for Raspberry Pi

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