Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: THS4509
Edited by the Electronicstalk Editorial Team on 25 January 2005
Amplifier makes the
most of high-speed ADCs
Texas Instruments has developed the industry's lowest noise, lowest distortion fully differential amplifier for driving high-speed analogue-to-digital convertors up to 100MHz
Texas Instruments has developed the industry's lowest noise, lowest distortion fully differential amplifier for driving high-speed analogue-to-digital convertors (ADCs) up to 100MHz. With one-third less settling time than previous industry-leading fully-differential amplifiers, the 1.9GHz THS4509 is ideal for use in demanding applications such as test and measurement, medical imaging, wireless infrastructure and industrial.
This article was originally published on Electronicstalk on 25 January 2005 at 8.00am (UK)
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Leveraging TI's unique, high-speed BiCom-III complementary bipolar silicon-germanium (SiGe) process, the THS4509 delivers an unmatched input referred voltage noise of 2.0nV/(rt)Hz, second- and third-order harmonic distortion at 70MHz of -80 and -87dBc (2V peak-peak into 200ohm load), respectively, and 1% settling time of 2ns with 2V output step.
When driving the ADS5500 14bit ADC at 125Msample/s and 70MHz input frequency, the THS4509 and ADS5500 system achieves unprecedented levels of performance.
The single-tone spurious-free dynamic range (SFDR) is 81dBc, the two-tone SFDR with 5MHz tone spacing is 89dBc and the signal-to-noise ratio (SNR) is 70.1dB FS.
BiCom-III is the industry's only SiGe process that integrates complementary NPN and PNP bipolar transistors, enabling high-performance analogue and mixed-signal products that combine high speed, low noise, low voltage and greater dynamic range.
This enables designers to achieve optimal high-speed performance without requiring complex compensation circuits or drawing large currents.
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'Designers require an amplifier that is on equal footing with the ADC in order to realise the full potential of their high-speed systems', said Art George, Vice President of TI's high-performance linear business.
'With the THS4509, customers enjoy the best of two worlds, highest performance and ease of use'.
The architecture of the THS4509 decouples the gain, output common-mode voltage and output impedance-matching issues from one another, enabling the designer to easily set them independently.
In addition, the device will perform single-ended input to differential output conversion to enable DC-coupled data acquisition systems.
Along with the noise and distortion performance, these features enable the designer to ensure accurate low-level signal measurements and high signal fidelity, while greatly simplifying the design process and reducing the overall solution size.
Additional features of the THS4509 include large signal bandwidth (2V peak-peak) of 1.5GHz, small signal bandwidth of 1.9GHz (below 1V peak-peak), slew rate of 6600V/us and 0.65mA power-down mode.
The THS4509 is well suited for driving other high-performance ADCs, including the new ADS5424 14bit, 105Msample/s ADC.
The THS4509 joins TI's leading-edge portfolio of high-speed amplifiers, such as the OPA695 1.4GHz current feedback and THS4304 3GHz voltage feedback operational amplifiers, designed to drive the latest data convertors to their optimal performance.
TI's high-speed amplifiers and ADCs, along with the company's RF, digital downconvertor and high-performance TMS320C6000TM DSP products, provide a truly state-of-the-art signal chain for wideband applications.
The THS4509 is sampling now, with volume production scheduled for Q1 2005.
The device is available in a 16-pin quad flat no-lead (QFN) package, priced at $3.75 in 1000-unit quantities.
An evaluation module (EVM) is also available.
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