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AD8330ARQ-REEL7 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD8330ARQ-REEL7 Scheda tecnica(HTML) 1 Page - Analog Devices |
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1 / 28 page  REV. A AD8330* Low Cost DC-150 MHz Variable Gain Amplifier 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 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 © 2003 Analog Devices, Inc. All rights reserved. *Protected by U.S.Patent No. 5,969,657; other patents pending. FUNCTIONAL BLOCK DIAGRAM COMM OPHI INLO OPLO INHI VPSI VPSO CMOP MODE VDBS CMGN VMAG OFST ENBL CNTR VPOS BIAS AND VREF GAIN INTERFACE CM AND OFFSET CONTROL OUTPUT STAGES OUTPUT CONTROL VGA CORE 12 11 10 9 16 15 14 13 5678 1 2 3 4 FREQUENCY – Hz 90 100k 30 –10 –50 50 10 –30 1M 10M 100M 300M 70 Figure 1. AC Response over the Extended Gain Range FEATURES Fully Differential Signal Path May also be Used with Single-Sided Signals Inputs from 0.3 mV to 1 V rms, Rail-Rail Outputs Differential RIN = 1 k ; ROUT (Each Output) 75 Automatic Offset Compensation (Optional) Linear-in-dB and Linear-in-Magnitude Gain Modes 0 dB to 50 dB, for 0 V < VDBS < 1.5 V (30 mV/dB) Inverted Gain Mode: 50 dB to 0 dB at –30 mV/dB 0.03 to 10 Nominal Gain for 15 mV < VMAG < 5 V Constant Bandwidth: 150 MHz at All Gains Low Noise: 5 nV/ √Hz typical at Maximum Gain Low Distortion: ≤–62 dBc Typ Low Power: 20 mA Typ at VS of 2.7 V – 6 V Available in Space Saving 3 3 LFCSP Package APPLICATIONS Pre-ADC Signal Conditioning 75 Cable Driving Adjust AGC Amplifiers GENERAL DESCRIPTION The AD8330 is a wideband variable-gain amplifier for use in applications requiring a fully differential signal path, low noise, well- defined gain, and moderately low distortion, from dc to 150 MHz. The input pins can also be driven from a single ended source. The peak differential input is ±2V, allowing sinewave operation at 1V rms with generous headroom. The output pins can optionally drive single-sided loads and each swing essentially rail-to-rail. The differential output resistance is 150 Ω. The output swing is a linear function of the voltage applied to the VMAG pin, which internally defaults to 0.5 V, to provide a peak output of ±2 V. This may be raised to 10 V p-p, limited by the supply voltage. The basic gain function is linear-in-dB, controlled by the voltage applied to pin VDBS. The gain ranges from 0 dB to 50 dB for control voltages between 0 V and 1.5 V—a slope of 30 mV dB. The gain linearity is typically within ±0.1 dB. By changing the logic level on pin MODE, the gain will decrease over the same range, with opposite slope. A second gain control port is provided at pin VMAG and allows the user to vary the numeric gain from a factor of 0.03 to 10. All the parameters of the AD8330 have low sensitivities to temperature and supply voltages. Using VMAG, the basic 0 dB to 50 dB range can be repositioned to any value from 20 dB higher (that is, 20 dB to 70 dB) to at least 30 dB lower (that is, –30 dB to +20 dB) to suit the application, providing an unprecedented gain range of over 100 dB. A unique aspect of the AD8330 is that its bandwidth and pulse response are essentially constant for all gains, not only over the basic 50 dB linear-in-dB range, but also when using the linear-in-magnitude function. The exceptional stability of the HF response over the gain range is of particular value in those VGA applications where it is essential to maintain accurate gain law-conformance at high frequencies. An external capacitor at pin OFST sets the high-pass corner of an offset reduction loop, whose frequency may be as low as 5 Hz. When this pin is grounded, the signal path becomes dc-coupled. When used to drive an ADC, an external common-mode control voltage at pin CNTR can be driven to within 0.5 V of either ground or VS to accommodate a wide variety of requirements. By default, the two outputs are positioned at the mid point of the supply, VS/2. Other features, such as two levels of power-down (fully off and a hibernate mode), further extend the practical value of this exceptionally versatile VGA. The AD8330 is available in a 16-lead LFCSP and 16-lead QSOP packages and is specified for operation from –40 °C to +85°C. |
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