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AD8330ACP-R2 데이터시트(PDF) 1 Page - Analog Devices |
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AD8330ACP-R2 데이터시트(HTML) 1 Page - Analog Devices |
1 / 32 page Low Cost DC to 150 MHz Variable Gain Amplifier AD8330 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Fully differential signal path and also used with single-sided signals Inputs from 0.3 mV to 1 V rms, rail-to-rail outputs Differential RIN = 1 kΩ; ROUT (each output) 75 Ω 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 typical Low power: 20 mA typical at VS of 2.7 V to 6 V Available in a space-saving, 3 mm × 3 mm LFCSP package APPLICATIONS Pre-ADC signal conditioning 75 Ω cable driving adjust AGC amplifiers GENERAL DESCRIPTION The AD83301 is a wideband variable gain amplifier for 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 ±2 V, allowing sine wave operation at 1 V rms with generous headroom. The output pins can drive single-sided loads 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 that internally defaults to 0.5 V providing a peak output of ±2 V. This can 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 decreases over the same range, with an opposite slope. A second gain control port is provided at the VMAG pin 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. 1 Protected by U.S. Patent No. 5,969,657; other patents pending. FUNCTIONAL BLOCK DIAGRAM VDBS VMAG COMM 15 CMGN 14 13 ENBL VPSO CNTR VPOS OFST OPHI VPSI INHI INLO MODE CMOP OPLO BIAS AND VREF VGA CORE OUTPUT CONTROL GAIN INTERFACE OUTPUT STAGES 8 7 6 5 4 10 11 12 16 3 2 1 9 CM AND OFFSET CONTROL Figure 1. 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, thereby 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, over both 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 can 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 midpoint 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 excep- tionally versatile VGA. The AD8330 is available in 16-lead LFCSP and 16-lead QSOP packages and is specified for operation from −40°C to +85°C. |
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