Fully-Differential Amp drives ADCs up to 100 MHz.

Press Release Summary:

Available in 16-pin QFN package, 1.9 GHz THS4509 leverages BiCom-III complementary bipolar silicon-germanium process, which integrates NPN and PNP bipolar transistors. Unit delivers input referred voltage noise of 2.0 nV/rtHz and 1% settling time of 2 ns with 2 V output step. Other features include large signal bandwidth of 1.5 GHz, small signal bandwidth of 1.9 GHz, slew rate of 6,600 V/µs and 0.65 mA power-down mode.

Original Press Release:

TI Unveils New Generation of Fully-Differential Amplifiers for Driving Highest-Performance Analog-to-Digital Converters

Fast Settling Time, Low Noise Enable Top Performance from High-Speed Analog-to-Digital Converters

DALLAS (Jan. 24, 2005) -Texas Instruments Incorporated (TI) (NYSE: TXN) introduced today the industry's lowest noise, lowest distortion fully-differential amplifier for driving high-speed analog-to-digital converters (ADC) up to 100 MHz. With one-third less settling time than previous industry-leading fully-differential amplifiers, the 1.9-GHz THS4509 is ideal for use in demanding applications such as test and measurement, medical imaging, wireless infrastructure and industrial. (Please see www.ti.com/sc05006.)

Leveraging TI's unique, high-speed BiCom-III complementary bipolar Silicon-Germanium (SiGe) process, the THS4509 delivers an unmatched input referred voltage noise of 2.0 nV/rtHz, second- and third-order harmonic distortion at 70 MHz of -80 dBc and -87 dBc (2 Vpp into 200 ohm load), respectively, and 1% settling time of 2 ns with 2-V output step. When driving the ADS5500 14-bit ADC at 125 MSPS (mega samples per second) and 70-MHz input frequency, the THS4509 and ADS5500 system achieves unprecedented levels of performance. The single-tone spurious-free dynamic range (SFDR) is 81 dBc, the two-tone SFDR with 5-MHz tone spacing is 89 dBc and the signal-to-noise ratio (SNR) is 70.1 dBFS.

BiCom-III is the industry's only SiGe process that integrates complementary NPN and PNP bipolar transistors, enabling high-performance analog 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.

"Designers require an amplifier that is on equal footing with the ADC in order to realize 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 (2 Vpp) of 1.5 GHz, small signal bandwidth of 1.9 GHz (<1 Vpp), slew rate of 6600 V/us and 0.65 mA power-down mode.

The THS4509 is well-suited for driving other high-performance ADCs, including the new ADS5424 14-bit, 105-MSPS ADC. The THS4509 joins TI's leading-edge portfolio of high-speed amplifiers, such as the OPA695 1.4-GHz current feedback and THS4304 3-GHz voltage feedback operational amplifiers, designed to drive the latest data converters to their optimal performance. TI's high-speed amplifiers and ADCs, along with the company's RF, digital down converter and high-performance TMS320C6000TM DSP products, provide a truly state-of-the-art signal chain for wideband applications.

Leading High-Performance Analog Processes

In addition to providing an impressive analog product portfolio, Texas Instruments is a leading developer of semiconductor manufacturing technology for analog and mixed-signal products. For applications requiring integration with digital logic, TI leverages its mature, low-cost Complementary Metal-Oxide Semiconductor (CMOS) logic technology and optimizes it to support analog components. For more specialized analog functions, TI product development teams focus on precision, speed and power using a variety of Silicon Germanium (SiGe) bipolar, Silicon on Insulator (SOI) and CMOS process technologies.

Availability and Pricing

The THS4509 is sampling now, with volume production scheduled for 1Q 2005. The device is available in a 16-pin quad flat no-lead (QFN) package, priced at $3.75 in 1,000-unit quantities. An evaluation module (EVM) is also available.

Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries.

Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at www.ti.com

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