LTC2672

RECOMMENDED FOR NEW DESIGNS

Five-Channel, Current Output DAC with Internal Reference and SPI

Data Sheet (Rev. D) Product Selection Table
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Overview

  • Per channel programmable output current ranges: 300 mA, 200 mA, 100 mA, 50 mA, 25 mA, 12.5 mA, 6.25 mA, and 3.125 mA
  • Flexible 2.1 V to VCC output supply voltages
  • Flexible single- or dual-supply operation
  • 0.6 V maximum dropout voltage guaranteed
  • Separate voltage supply per output channel
  • Internal switches to optional negative supply
  • Full 12-bit and 16-bit resolution at all ranges
  • Guaranteed operation −40°C to 125°C (H-grade)
  • Precision internal reference or external reference
    • Internal VREF temperature coefficient of 10 ppm/°C maximum (LFCSP) or 2.4 ppm/°C nominal (WLCSP)
  • Analog multiplexer monitors voltages and currents
  • A/B toggle via SPI or dedicated pin
  • 1.71 V to VCC digital input and output supply voltage
  • 32-lead lead frame chip scale package (LFCSP)
  • 36-ball wafer level chip scale package (WLCSP)

The LTC2672 is a family of five-channel, 12-/16-bit current source, digital-to-analog converters (DACs) that provide five high compliance, current source outputs with guaranteed 0.6 V dropout at 200 mA. There are eight current ranges that are programmable per channel with full-scale outputs of up to 300 mA. The channels can be paralleled to allow either ultrafine adjustments of large currents or combined outputs of up to 1.5 A. A dedicated supply pin is provided for each output channel. Each channel can be operated from 2.1 V to VCC, and internal switches allow any output to be pulled to the optional negative supply. The LTC2672 includes a precision integrated 1.25 V reference (10 ppm/°C maximum (LFCSP) or 2.4 ppm/°C nominal (WLCSP)), with the option to use an external reference. The serial peripheral interface (SPI)-compatible, 3‑wire serial interface operates on logic levels as low as 1.71 V and at clock rates as high as 50 MHz.

Note that throughout this data sheet, multifunction pins, such as CS/LD, are referred to by the entire pin name or by a single function of the pin.

APPLICATIONS

  • Tunable lasers
  • Semiconductor optical amplifier biasing
  • Resistive heaters
  • Current mode biasing

LTC2672
Five-Channel, Current Output DAC with Internal Reference and SPI
LTC2672 Functional Block Diagram LTC2672-16DICE Functional Block Diagram LTC2672 Pin Configuration LTC2672-16DICE Pin Configuration
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Documentation

Data Sheet 2

User Guide 1

Application Note 1

Technical Articles 1

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Software Resources

Device Drivers 2

Evaluation Kits

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DC2903A

LTC2672 Demo Board | Five-Channel Current Output DAC, with Internal Reference and SPI Interface. (Requires DC2026C)

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Features and Benefits

Product Details

The DC2903A is a fully featured evaluation board that evaluates the LTC2672, a five-channel, current source output digital-to-analog converter (DAC).

The DC2903A 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 DC2903A.

The DC2903A uses QuikEval evaluation software to provide an intuitive graphical user interface (GUI) that configures and controls the LTC2672 using the SPI interface.

The LTC2672 is used for various current mode biasing applications such as tunable lasers or resistive heaters. The output current ranges are software selectable, and each channel is routed to the DC2903A MUX pin for external monitoring.

For full specifications on the LTC2672, see the LTC2672 data sheet, which must be consulted in conjunction with the DC2903A user guide when using the DC2903A.

DC2903A
LTC2672 Demo Board | Five-Channel Current Output DAC, with Internal Reference and SPI Interface. (Requires DC2026C)
DC2903A-A - Angle View DC2903A-A - Top View DC2903A-A - Bottom View

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