DAC offers 6 software-programmable output ranges.

Press Release Summary:



Operating from 2.7-5.5 V supply, Model LTC2755-16 provides unipolar outputs of 0 to +5 V and 0 to +10 V, as well as bipolar outputs of ±5, ±10, ±2.5, and -2.5 to +7.5 V. Unit guarantees 16-bit linearity over industrial temperature range without any adjustment. Each DAC output can be individually programmed through parallel interface or pin-strapped for operation within single range. Housed in 9 x 9 mm QFN package, converter offers full-scale settling time of 2 µs and 1 nVos glitch impulse.



Original Press Release:



16-Bit Quad IOUT Multiplying DAC Achieves ±1LSB INL and DNL



MILPITAS, CA - April 29, 2008 - Linear Technology Corporation introduces the LTC2755-16, a quad 16-bit current output digital-to-analog converter (DAC) with six software-programmable output ranges. The LTC2755-16 guarantees 16-bit linearity (±1LSB (max) INL and DNL) over the industrial temperature range without any adjustment. Each DAC output can be individually programmed through a parallel interface or can be pin-strapped for operation within a single range. A current output DAC allows end-users to customize their output amplifiers for optimal performance, depending on the requirements for better DC or AC specifications, lower noise, or higher speed. By integrating four DACs with very good linearity, the LTC2755-16 is ideal for multichannel data acquisition systems and automated test equipment.

The LTC2755-16 is capable of outputting six unique software-programmable (SoftSpan(TM)) unipolar and bipolar output ranges up to ±10V. Software programmability eliminates the need for expensive precision resistors, gain stages and switching jumpers by hand. The six SoftSpan output voltage ranges include two unipolar ranges (0V to 5V, 0V to 10V) and four bipolar ranges (±10V, ±5V, ±2.5V, -2.5V to +7.5V). The LTC2755-16 outputs any of the six SoftSpan ranges while operating from a single 2.7V to 5.5V supply, drawing a maximum supply current of only 1uA.

The LTC2755-16 also offers very good AC specifications, including full-scale settling time of only 2us and low 1nVos glitch impulse. The LTC2755-16's 2MHz multiplying bandwidth and good AC specifications are key for applications such as waveform generation. Fast settling and low glitch reduce the harmonic distortion, making it possible to produce higher frequency, lower noise output waveforms. The LTC2755-16 uses a bidirectional input/output parallel interface that allows readback of any internal register, as well as the DAC output span setting.

The LTC2755-14 and LTC2755-12 are pin-compatible 14-bit and 12-bit devices, respectively. The LTC2755 DACs are all available in 9mm x 9mm QFN-48 packages, offering a pin-compatible and code-compatible family for performance/cost optimization in the end-product. The quad LTC2755 joins the dual LTC2753 and single LTC2751, forming a complete family of precision current output DACs. The entire family is available today in commercial and industrial temperature ranges. Pricing begins at $7.15 each for the LTC2755-12, $12.65 each for the LTC2755-14, and $17.85 each for the LTC2755-16 in 1,000-piece quantities.

Summary of Features:
LTC2755-16/LTC2755-14/ LTC2755-12
Six Programmable Output Ranges:
o Unipolar 0V to +5V, 0V to +10V
o Bipolar ±5V, ±10V, ±2.5V, -2.5 to +7.5V
±1LSB INL, ±1LSB DNL Over Temperature
Low 1uA(max) Supply Current
Low 1nVos Glitch Impulse
Fast 2µs Settling Time
2.7V to 5.5V Single Supply Operation
Parallel Interface with Data and Span Readback
Asynchronous CLR Pin Clears DAC Outputs to 0V in Any Output Range
Power-On Reset Clears DAC Outputs to 0V
64-Pin 9mm x 9mm QFN Package
Quad 16-Bit IOUT SoftSpan DAC with ±1LSB INL

About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.

LT, LTC and LTM are registered trademarks and uModule and SoftSpan are trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.

North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com

Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com

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