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AD8335-EVAL 데이터시트(PDF) 1 Page - Analog Devices |
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1 / 24 page Quad Low Noise, Low Cost Variable Gain Amplifier AD8335 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 Low noise preamplifier (PrA) Voltage noise = 1.3 nV/√Hz typical Current noise = 2.4 pA/√Hz typical NF = 7 dB (RS = RIN = 50 Ω) Single-ended input; VIN max = 625 mV p-p Active input match Input SNR (noise bandwidth = 20 MHz) = 92 dB VGA Differential output VOUT max = 5 V p-p, RL = 500 Ω differential Gain range (8 dB output gain step) −10 dB to +38 dB—LO gain mode −2 dB to +46 dB—HI gain mode Accurate linear-in-dB gain control PrA + VGA performance −3 dB bandwidth of 70 MHz Excellent overload performance Supply: 5 V Power consumption 95 mW/channel (380 mW total) 65 mW/channel (PrA off; 260 mW total) Power-down APPLICATIONS Medical imaging (ultrasound, gamma cameras) Sonar Test and measurement Precise, stable wideband gain control FUNCTIONAL BLOCK DIAGRAM 63 PIP1 64 PMD1 1 PMD2 2 PIP2 4 PON2 5 POP2 6 VIP2 7 VIN2 10 VIN3 11 VIP3 12 POP3 13 PON3 15 PIP3 16 PMD3 17 PMD4 18 PIP4 61 60 59 58 53 55 52 51 49 47 VOH1 46 VOL1 56 VGN1 50 SL12 54 VGN2 43 VOL2 42 VOH2 39 VOH3 38 VOL3 27 VGN3 31 SL34 25 VGN4 35 VOL4 34 VOH4 20 21 22 23 28 26 29 30 32 18dB 18dB 18dB 18dB VMD1 VMD2 VMD3 VMD4 INTERPOLATOR INTERPOLATOR INTERPOLATOR INTERPOLATOR 20dB TO 28dB 20dB TO 28dB 20dB TO 28dB 20dB TO 28dB ATTEN –48dB TO 0dB ATTEN –48dB TO 0dB ATTEN –48dB TO 0dB ATTEN –48dB TO 0dB GAIN INT GAIN INT GAIN INT GAIN INT AD8335 Figure 1. GENERAL DESCRIPTION The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel. The preamplifier (PrA) has a single-ended to differential gain of ×8 (18.06 dB) and accepts input signals ≤ 625 mV p-p. PrA noise is 1.2 nV/√Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/√Hz at maximum gain. Assuming a 20 MHz noise bandwidth (NBW), the Nyquist frequency for a 40 MHz ADC, the input SNR is 92 dB. The HILO pin optimizes the output SNR for 10-bit and 12-bit ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs. Channels 1 and 2 are enabled through the EN12 pin while Channels 3 and 4 are enabled through the EN34 pin. For VGA only applications, the PrAs can be powered down, significantly reducing power consumption. The AD8335 is available in a 64-lead lead frame chip scale (9 mm × 9 mm) package for the industrial temperature range of −40°C to +85°C. |
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