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AD8644AR2 데이터시트(PDF) 8 Page - Analog Devices |
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AD8644AR2 데이터시트(HTML) 8 Page - Analog Devices |
8 / 8 page –8– REV. 0 AD8614/AD8644 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 5-Lead SOT-23 (RT Suffix) 0.1181 (3.00) 0.1102 (2.80) PIN 1 0.0669 (1.70) 0.0590 (1.50) 0.1181 (3.00) 0.1024 (2.60) 1 3 4 5 0.0748 (1.90) BSC 0.0374 (0.95) BSC 2 0.0079 (0.20) 0.0031 (0.08) 0.0217 (0.55) 0.0138 (0.35) 10 0 0.0197 (0.50) 0.0138 (0.35) 0.0059 (0.15) 0.0019 (0.05) 0.0512 (1.30) 0.0354 (0.90) SEATING PLANE 0.0571 (1.45) 0.0374 (0.95) 14-Lead TSSOP (RU Suffix) 14 8 7 1 0.201 (5.10) 0.193 (4.90) PIN 1 SEATING PLANE 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0256 (0.65) BSC 0.0433 (1.10) MAX 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 0 14-Lead Narrow SOIC (R Suffix) 14 8 7 1 0.3444 (8.75) 0.3367 (8.55) 0.2440 (6.20) 0.2284 (5.80) 0.1574 (4.00) 0.1497 (3.80) PIN 1 SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0688 (1.75) 0.0532 (1.35) 0.0500 (1.27) BSC 0.0099 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) x 45 The remaining two amplifiers can be used as low voltage microphone preamplifiers. A single AD8614 can be used as a stand-alone microphone preamplifier. Figure 29 shows this implementation. AD1881 (AC'97) VREF 10k 21 MIC 1 IN AV = 20dB 1k 1 F 2.2k 5V 10k AV = +20dB 1k 1 F 2.2k 5V MIC 1 MIC 2 22 MIC 2 IN 27 Figure 29. Microphone Preamplifier SPICE Model Availability The SPICE model for the AD8614/AD8644 amplifier is available and can be downloaded from the Analog Devices’ web site at http://www.analog.com. The macro-model accurately simulates a number of AD8614/AD8644 parameters, including offset volt- age, input common-mode range, and rail-to-rail output swing. The output voltage versus output current characteristic of the macro-model is identical to the actual AD8614/AD8644 perfor- mance, which is a critical feature with a rail-to-rail amplifier model. The model also accurately simulates many ac effects, such as gain bandwidth product, phase margin, input voltage noise, CMRR and PSRR versus frequency, and transient response. Its high degree of model accuracy makes the AD8614/AD8644 macro-model one of the most reliable and true-to-life models available for any amplifier. |
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