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AD8332ACP-REEL Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD8332ACP-REEL Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 28 page Dual VGA with Ultralow Noise Preamplifier and Programmable RIN AD8332 FEATURES • Ultralow noise preamplifier − Voltage noise = 0.74 nV/√Hz − Current noise = 2.5 pA/√Hz • 3 dB bandwidth: 120 MHz • Low power: 125 mW/channel • Wide gain range with programmable postamp − –4.5 dB to +43.5 dB − +7.5 dB to +55.5 dB • Low output-referred noise: 48 nV/√Hz typical • Active input impedance matching • Optimized for 10-/12- bit ADCs • Selectable output clamping level • Single 5 V supply operation • Available in space-saving chip scale package APPLICATIONS • Ultrasound and sonar time-gain control • High performance AGC systems • I/Q signal processing • High speed dual ADC driver GENERAL DESCRIPTION The AD8332 is an ultralow noise, dual channel linear-in-dB variable gain amplifier (VGA). Although optimized for ultrasound systems, it may be used for a low noise variable gain control in any application of frequencies up to 120 MHz. Each channel of the AD8332 consists of an ultralow noise preamplifier (LNA), an X-AMP VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs capable of accurate, programmable active input impedance matching by selecting an external feedback resistor. Active impedance control optimizes noise performance for applications that benefit from input matching. The 48 dB gain range of the VGA makes the AD8332 suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential signal paths lead to superb second and third order distortion performance and low crosstalk. FUNCTIONAL BLOCK DIAGRAM LNA 1 27 28 +19dB 23 26 LMD1 INH1 COM1 VPS1 LNA 2 1 2 3 6 LMD2 INH2 VSP2 COM2 BIAS (VMID) VGA 1 BIAS AND INTERPOLATOR VGA 2 5 7 4 25 24 22 21 8 14 18 VMID POST AMP2 POST AMP1 11 CLAMP GAIN INT 20 9 19 17 16 10 13 12 [(–48 to 0) + 21] dB 3.5dB/ 15.5dB LON2 LOP2 VIP2 VIN2 COMM ENB RCLMP VOH1 VOL1 GAIN VOL2 VOH2 LON1 LOP1 VIP1 VIN1 VPSV VCM1 15 HILO VCM2 Figure 1. 28-Lead TSSOP FREQUENCY – Hz –10 0 10 20 40 30 50 100k –20 1M 1G 100M 10M VGAIN = 1V 0.8V 0.6V 0.4V 0.2V 0V Figure 2. Frequency Response vs. Gain The VGA’s low output-referred noise is advantageous in driving high speed differential ADCs. The gain of the postamplifier may be pin selected to 3.5 dB or 15.5 dB to optimize gain range and output noise for 12-bit or 10-bit converter applications. The output may be limited to a user-selected clamping level, preventing input overload to a subsequent ADC. An external resistor adjusts the clamping level. The AD8332 is available in 28-lead TSSOP and 32-lead LFCSP packages and operates from a single 5 V supply. The total quiescent power consumption is 250 mW and a power-down pin is provided. The operating temperature range is –40°C to +85°C. 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 companies. 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 © 2002 Analog Devices, Inc. All rights reserved. |
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