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AD8370ARE Fiches technique(PDF) 1 Page - Analog Devices |
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AD8370ARE Fiches technique(HTML) 1 Page - Analog Devices |
1 / 28 page LF to 750 MHz Digitally Controlled VGA AD8370 Rev. 0 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Programmable low and high gain (<2 dB resolution) Low range: −11 dB to +17 dB High range: +6 dB to +34 dB Differential input and output: 200 Ω differential input 100 Ω differential output 7 dB noise figure @ maximum gain Two-tone IP3 of +35 dBm @ 70 MHz −3 dB bandwidth of 750 MHz 40 dB precision gain range Serial 8-bit digital interface Wide input dynamic range Power-down feature Single 3 V to 5 V supply APPLICATIONS Differential ADC drivers IF sampling receivers RF/IF gain stages Cable and video applications SAW filter interfacing Single-ended-to-differential conversion GENERAL DESCRIPTION The AD8370 is a low cost, digitally controlled, variable gain amplifier that provides precision gain control, high IP3, and low noise figure. The excellent distortion performance and wide bandwidth make the AD8370 a suitable gain control device for modern receiver designs. For wide input, dynamic range applications, the AD8370 pro- vides two input ranges: high gain mode and low gain mode. A vernier 7-bit transconductance (Gm) stage provides 28 dB of gain range at better than 2 dB resolution, and 22 dB of gain range at better than 1 dB resolution. A second gain range, 17 dB higher than the first, can be selected to provide improved noise performance. The AD8370 is powered on by applying the appropriate logic level to the PWUP pin. When powered down, the AD8370 consumes less than 4 mA and offers excellent input to output isolation. The gain setting is preserved when operating in a power-down mode. FUNCTIONAL BLOCK DIAGRAM INHI INLO OPHI OPLO VCCO OCOM ICOM VOCM PWUP VCCO OCOM VCCI ICOM BIAS CELL SHIFT REGISTER AND LATCHES PRE AMP TRANSCONDUCTANCE OUTPUT AMP 11 6 1 16 4 14 13 12 5 9 8 3 2 10 7 15 DATA CLCK LTCH AD8370 Figure 1. 0 10 20 30 40 50 60 70 –30 –20 –10 0 10 20 30 40 0 1020 3040 60 100 50 70 80 90 110 120 130 GAIN CODE CODE = LAST 7 BITS OF GAIN CODE (NO MSB) HIGH GAIN MODE HIGH GAIN MODE LOW GAIN MODE LOW GAIN MODE ∆ GAIN ∆ CODE ≅ 0.409 ∆ GAIN ∆ CODE ≅ 0.059 Figure 2. Gain vs. Gain Code at 70 MHz Gain control of the AD8370 is through a serial 8-bit gain control word. The MSB selects between the two gain ranges, and the remaining 7 bits adjust the overall gain in precise linear gain steps. Fabricated on the ADI high speed XFCB process, the high band- width of the AD8370 provides high frequency and low distortion. The quiescent current of the AD8370 is 78 mA typically. The AD8370 amplifier comes in a compact, thermally enhanced 16-lead TSSOP package and operates over the temperature range of −40°C to +85°C. |
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