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AD605A Folha de dados(PDF) 1 Page - Analog Devices |
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AD605A Folha de dados(HTML) 1 Page - Analog Devices |
1 / 12 page REV. C a AD605 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. 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 © 2004 Analog Devices, Inc. All rights reserved. Dual, Low Noise, Single-Supply Variable Gain Amplifier FUNCTIONAL BLOCK DIAGRAM PRECISION PASSIVE INPUT ATTENUATOR FIXED GAIN AMPLIFIER +34.4dB DIFFERENTIAL ATTENUATOR 0 TO –48.4dB OUT VOCM VGN VREF +IN –IN GAIN CONTROL AND SCALING FBK AD605 FEATURES Two Independent Linear-in-dB Channels Input Noise at Maximum Gain: 1.8 nV/ √Hz, 2.7 pA/√Hz Bandwidth: 40 MHz (–3 dB) Differential Input Absolute Gain Range Programmable: –14 dB to +34 dB (FBK Shorted to OUT) Through 0 dB to +48 dB (FBK Open) Variable Gain Scaling: 20 dB/V Through 40 dB/V Stable Gain with Temperature and Supply Variations Single-Ended Unipolar Gain Control Output Common-Mode Independently Set Power Shutdown at Lower End of Gain Control Single 5 V Supply Low Power: 90 mW/Channel Drives A/D Converters Directly APPLICATIONS Ultrasound and Sonar Time-Gain Control High Performance AGC Systems Signal Measurement GENERAL DESCRIPTION The AD605 is a low noise, accurate, dual channel, linear-in-dB variable gain amplifier, which is optimized for any application requiring high performance, wide bandwidth variable gain con- trol. Operating from a single 5 V supply, the AD605 provides differential inputs and unipolar gain control for ease of use. Added flexibility is achieved with a user-determined gain range and an external reference input which provides user-determined gain scaling (dB/V). The high performance linear-in-dB response of the AD605 is achieved with the differential input, single supply, exponential amplifier (DSX-AMP) architecture. Each of the DSX-AMPs comprise a variable attenuator of 0 dB to –48.4 dB followed by a high speed fixed gain amplifier. The attenuator is based on a 7-stage R-1.5R ladder network. The attenuation between tap points is 6.908 dB, and 48.360 dB for the entire ladder network. The DSX-AMP architecture results in 1.8 nV/ √Hz input noise spectral density and will accept a ± 2.0 V input signal when VOCM is biased at VP/2. Each independent channel of the AD605 provides a gain range of 48 dB which can be optimized for the application. Gain ranges between –14 dB to +34 dB and 0 dB to +48 dB can be selected by a single resistor between pins FBK and OUT. The lower and upper gain ranges are determined by shorting pin FBK to OUT, or leaving pin FBK unconnected, respectively. The two channels of the AD605 can be cascaded to provide 96 dB of very accurate gain range in a monolithic package. The gain control interface provides an input resistance of approxi- mately 2 M Ω and scale factors from 20 dB/V to 30 dB/V for a VREF input voltage of 2.5 V to 1.67 V, respectively. Note that scale factors up to 40 dB/V are achievable with reduced accu- racy for scales above 30 dB/V. The gain scales linearly in dB with control voltages (VGN) of 0.4 V to 2.4 V for the 20 dB/V scale and 0.20 V to 1.20 V for the 40 dB/V scale. When VGN is <50 mV the amplifier is powered down to draw 1.9 mA. Under normal operation, the quiescent supply current of each amplifier channel is only 18 mA. The AD605 is available in 16-lead PDIP and SOIC, and is guaranteed for operation over the –40 °C to +85°C tempera- ture range. |
Nº de peça semelhante - AD605A |
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Descrição semelhante - AD605A |
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