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AD831AP データシート(PDF) 1 Page - Analog Devices |
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AD831AP データシート(HTML) 1 Page - Analog Devices |
1 / 16 page FUNCTIONAL BLOCK DIAGRAM GND VN RFP RFN VN BIAS VN OUT VFB COM AD831 50 Ω 50 Ω 13 9 10 11 12 6 7 8 4 5 14 15 16 17 18 1 2 3 19 20 REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Low Distortion Mixer AD831 FEATURES Doubly-Balanced Mixer Low Distortion +24 dBm Third Order Intercept (IP3) +10 dBm 1 dB Compression Point Low LO Drive Required: –10 dBm Bandwidth 500 MHz RF and LO Input Bandwidths 250 MHz Differential Current IF Output DC to >200 MHz Single-Ended Voltage IF Output Single or Dual Supply Operation DC Coupled Using Dual Supplies All Ports May Be DC Coupled No Lower Frequency Limit—Operation to DC User-Programmable Power Consumption APPLICATIONS High Performance RF/IF Mixer Direct to Baseband Conversion Image-Reject Mixers I/Q Modulators and Demodulators PRODUCT DESCRIPTION The AD831 is a low distortion, wide dynamic range, monolithic mixer for use in such applications as RF to IF down conversion in HF and VHF receivers, the second mixer in DMR base sta- tions, direct-to-baseband conversion, quadrature modula- tion and demodulation, and doppler-shift detection in ultra- sound imaging applications. The mixer includes an LO driver and a low-noise output amplifier and provides both user-pro- grammable power consumption and 3rd-order intercept point. The AD831 provides a +24 dBm third-order intercept point for –10 dBm LO power, thus improving system performance and reducing system cost compared to passive mixers, by eliminating the need for a high power LO driver and its attendant shielding and isolation problems. The RF, IF, and LO ports may be dc or ac coupled when the mixer is operating from ±5 V supplies or ac coupled when oper- ating from a single supply of 9 V minimum. The mixer operates with RF and LO inputs as high as 500 MHz. The mixer’s IF output is available as either a differential current output or a single-ended voltage output. The differential output is from a pair of open collectors and may be ac coupled via a transformer or capacitor to provide a 250 MHz output band- width. In down-conversion applications, a single capacitor con- nected across these outputs implements a low-pass filter to reduce harmonics directly at the mixer core, simplifying output filtering. When building a quadrature-amplitude modulator or image reject mixer, the differential current outputs of two AD831s may be summed by connecting them together. An integral low noise amplifier provides a single-ended voltage output and can drive such low impedance loads as filters, 50 Ω amplifier inputs, and A/D converters. Its small signal bandwidth exceeds 200 MHz. A single resistor connected between pins OUT and FB sets its gain. The amplifier’s low dc offset allows its use in such direct-coupled applications as direct-to-baseband conversion and quadrature-amplitude demodulation. The mixer’s SSB noise figure is 10.3 dB at 70 MHz using its output amplifier and optimum source impedance. Unlike pas- sive mixers, the AD831 has no insertion loss and does not re- quire an external diplexer or passive termination. A programmable-bias feature allows the user to reduce power consumption, with a reduction in the 1 dB compression point and third-order intercept. This permits a tradeoff between dy- namic range and power consumption. For example, the AD831 may be used as a second mixer in cellular and two-way radio base stations at reduced power while still providing a substantial performance improvement over passive solutions. PRODUCT HIGHLIGHTS 1. –10 dBm LO Drive for a +24 dBm Output Referred Third Order Intercept Point 2. Single-Ended Voltage Output 3. High Port-to-Port Isolation 4. No Insertion Loss 5. Single or Dual Supply Operation 6. 10.3 dB Noise Figure © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 |
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