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AD8375-EVALZ Datasheet(PDF) 1 Page - Analog Devices |
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AD8375-EVALZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 6 page 24dB Range, 1dB Step Size Programmable VGA Preliminary Technical Data AD8375 Rev. PrB March 13, 2007 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2007 Analog Devices, Inc. All rights reserved. FEATURES -4 to 20dB Gain Range 1 dB Step Size ± 0.2 dB Differential input and output 150 Ω Differential Input Open Collector Differential Output 8dB noise figure @ maximum gain OIP3 of ~50dBm at 140MHz −3 dB bandwidth of 690 MHz Parallel 5-bit Control Interface Wide input dynamic range Power-down feature Single 5V Supply Operation 24 Lead LFCSP 4 x 4 mm Package APPLICATIONS Differential ADC drivers High IF Sampling Receivers High Output Power IF Amplification Instrumentation GENERAL DESCRIPTION The AD8375 is a digitally controlled, variable gain wide bandwidth amplifier that provides precise gain control, high IP3 and low noise figure. The excellent distortion performance and high signal bandwidth makes the AD8375 an excellent gain control device for a variety of receiver applications. For wide input dynamic range applications, the AD8375 pro- vides a broad 24dB gain range with 1 dB resolution. The gain is adjusted through a 5-pin control interface and can be driven using standard TTL levels. The open-collector outputs provide a flexible interface, allowing the overall signal gain to be set by the loading resistance. The AD8375 offers a maximum trans- conductance gain of 67 mΩ-1’s, resulting in a signal gain of 20dB when driving a 150-Ohm load. The maximum signal gain increases to ~24dB when driving a 250-Ohm differential load. FUNCTIONAL BLOCK DIAGRAM Figure 1. Using a high speed SiGe process and incorporating proprietary distortion cancellation techniques, the AD8375 achieves 50 dBm output IP3 at 140 MHz. The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is typically 130mA. When powered down, the AD8375 consumes less than 5mA and offers excellent input to output isolation. The gain setting is preserved when powered down. Fabricated on an ADI’s high speed SiGe process, the AD8375 provides precise gain adjustment capabilities with good distortion performance. The AD8375 amplifier comes in a compact, thermally enhanced 4 x 4mm 24-lead LFCSP package and operates over the temperature range of −40°C to +85°C. |
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