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Solutions Search - High Speed ADCs (Fs >=10Msps)

LTC2387 Drivers Part IV: How to Drive the LTC2387 Reference

Derek Redmayne - Staff Scientist Jul 10th 2017
How to Drive the LTC2387 Reference The schematic below shows an external reference filter/buffer that becomes the reference amplifier, “overdriving” REFBUF and producing a 1/f corner that is at least a factor of 50 lower than the internal reference. The internal reference has a 1/f corner at about 15 KHz. With ...

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Uncompromised Linearity from the LTC2185 and ADA4927-1

Clarence Mayott - Applications Engineer Mar 10th 2017
Introduction The LTC2185 is a 125Msps 16-bit ADC with excellent noise and linearity performance while only consuming 185mW per channel. It is ideal for demanding low power applications that require excellent AC performance. A high performance ADC like the LTC2185 requires a high performance amplifier driving it to maintain ...

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High Linearity, Low Noise LTC2387-18 Drivers for Sinusoidal Signals

Doug Stuetzle - Senior Analog Applications Engineer Jan 10th 2017
Introduction The LTC2387-18 is a high speed SAR (Successive Approximation Register) ADC suited for high linearity, low noise applications. This ADC is capable of sampling at up to 15Msps, which allows it to convert signals at frequencies of several MHz. It is well-suited to convert both pulsed and continuous signals in this ...

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Testing Data Converters with the Arrow / Altera SoCkit FPGA Board

Mark Thoren - Staff Scientist Jan 3rd 2017
Introduction This blog describes how Linear Technology is using the SoCkit Cyclone V SoC FPGA board from Arrow Electronics as a system for evaluating medium- speed data converters: ADCs, DACs with sample rates less than 100Msps. LTC manufactures several evaluation boards for this purpose, including the DC718, DC890, and ...

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LTC2387 Drivers Part II: Drivers for Imaging

Derek Redmayne - Staff Scientist Dec 8th 2016
A Driver for Imaging (short version) The circuit shown below works great. You should try it. This is intended for nominally 0-3V single ended or differential signals, from CCDs, CMOS image sensors, or other similar signal sources. As shown, SNR is 88 dB. With the AD8008, in place of U1, and a few other minor changes, it ...

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Increase Spectral Resolution for the LTC2387-18 Demo Board - Part 1

Doug Stuetzle - Senior Analog Applications Engineer Oct 14th 2016
Introduction The LTC2387-18 is a low noise, high speed, 18-bit 15Msps successive approximation register (SAR) ADC. The combination of excellent linearity and wide dynamic range makes the LTC2387-18 ideal for high speed imaging and instrumentation applications. No latency operation provides a unique solution ...

Blog Post PScope 


Increase Spectral Resolution for the LTC2387-18 Demo Board - Part 2

Doug Stuetzle - Senior Analog Applications Engineer Oct 14th 2016
Introduction In Part 1 we designed and tested a lowpass + downsample structure that increased the spectral resolution of the DC2290A-A demonstration circuit for the LTC2387-18 high speed successive approximation register (SAR) ADC from 114Hz to 0.596Hz per bin. The average noise level per bin was ...

Blog Post PScope 


Single-Ended to Differential Driver Circuit for the LTC2387-18 SAR ADC

Doug Stuetzle - Senior Analog Applications Engineer Sep 26th 2016
The LTC®2387-18 is a 15Msps, highly linear, low-noise SAR converter with differential inputs. The combination of excellent linearity and wide dynamic range makes this ADC ideal for high speed imaging and instrumentation applications. No-latency operation provides a unique solution for high speed control loop applications. ...

Blog Post Circuit LTspice 


LTC2387 Drivers Part III: Trans-Impedance Amplifier/Driver

Derek Redmayne - Staff Scientist Sep 8th 2016
This is unabashedly a classic case of what marketing calls “a solution looking for a problem”. It is an example of how the full SNR of the LTC2387 may be realized for a real world signal. Most signals originating in low level circuitry, in sensors, or in the real world, will require significant gain to develop 8Vp-p ...

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How to Drive the LTC2387 (Part 1): Signal Applications to 5MHz that Require Low Inter-Modulation Distortion

Derek Redmayne - Staff Scientist May 13th 2016
The biggest challenge in driving a 15Msps, 18-bit ADC with an 8Vp-p input range is the lack of integrated amplifiers with adequate bandwidth, low noise, and the required output excursion. There are low-noise, high-BW amplifiers than can produce 2VPP. There are low speed amplifiers than can produce 8VPP. For low distortion beyond ...

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Multiple LTC2315-12 ADCs Share SPI Bus

Guy Hoover - Applications Engineer Mar 18th 2015
The data sheet doesn’t always show everything you need to know about using a part. For example, a common application when using multiple serial ADCs is to share the clock and data output lines to simplify the interface to the processor/ FPGA. The data sheet for the LTC2315-12 12-bit 5Msps, SPI compatible ADC with an integrated ...

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Driver for 14-Bit, 4.5Msps ADC Operates Over a Wide Gain Range

Guy Hoover - Applications Engineer Apr 3rd 2014
Introduction The LTC2314-14 is a 14-bit, 4.5Msps, serial output ADC with an integrated high performance reference. The single-ended input of the LTC2314-14 is easy to drive and in many instances does not require a buffer. A driver, such as the LT6236 op amp, may be required for a signal that is small or has high output impedance. ...

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Digital Output Randomizer for High Speed ADCs

Apr 2nd 2014
Click here for a list of high speed ADCs with Digital Output Randomization Interference from an analog-to-digtal converter's digital outputs is sometimes unavoidable. Digital interference may be from capacitive or inductive coupling or coupling through the ground plane. This effect is more pronounced with high speed ADCs where ...

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Alternate Bit Polarity Reduces Digital Feedback in High Speed ADCs

Apr 2nd 2014
Click here for a list of high speed data converters with alternate bit polarity mode Digital feedback occurs when the high speed transitions at the outputs of a high speed ADC are coupled (either capacitely or inductively) through the ground plane back to the sensitive analog input, creating unwanted tones and impairing the ...

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Internal Dither Improves High Speed ADC SFDR Performance

Mar 3rd 2014
Click here for a complete list of analog to digital converters with internal dither The LTC2208 is a 16-bit ADC with a very linear transfer function; however, at low input levels even slight imperfections in the transfer function will result in unwanted tones. Small errors in the transfer function are usually a result of ADC ...

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36V Input, Low Output Noise, 5A μModule Regulator for Precision Data Acquisition Systems

Jaino Parasseril - Applications Engineer Sep 1st 2013
Introduction Low output noise, fast transient response and high efficiency are just a few of the stringent power supply demands made by applications featuring high data rate FPGA I/O channels and high bit count data converters. The power supply designer faces the difficult task of meeting all of these requirements with as few ...

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A Short Course in PCB Layout for High-Speed ADCs

Derek Redmayne - Staff Scientist Mar 28th 2013
The intention here is to create the most concise layout guide ever.  This goes against our general philosophy of writing to minimize the number of phone calls.  This will likely generate a few phone calls because the reasons for the advice are not given.  They are the subject of a much longer document for those ...

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PScope: High-Speed ADC Data Collection Software

Clarence Mayott - Applications Engineer Jan 4th 2011
When Linear Technology provides a customer with a high speed ADC demo board we also provide PScope, the software to evaluate the demo board. PScope is a simple software package that can collect, and display data from high speed ADC demo boards. It will also provide a simple and easy way to measure the key performance parameters ...

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Reduce Digital Feedback in High Speed Data Conversion Systems - LTC2261

Clarence Mayott - Applications Engineer Mar 15th 2009
Linear Technology's newest high-speed ADC family achieves one third the power consumption of existing solutions without compromising AC performance. Operating from a low 1.8V supply, the 14-bit, 125Msps LTC2261 dissipates 125mW while maintaining 73.4dB SNR and 85dBc SFDR. Digital outputs can be configured as DDR CMOS, DDR LVDS ...

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