データシートサーチシステム |
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ML2009CP データシート(PDF) 6 Page - Micro Linear Corporation |
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ML2009CP データシート(HTML) 6 Page - Micro Linear Corporation |
6 / 11 page ML2008, ML2009 6 TYPICAL PERFORMANCE CURVES (Continued) 0.1 .08 .06 .04 .02 0 –.02 –.04 –.06 –.08 –1.0 –24 GAIN SETTING (dB) –18 –12 –6 0 6 12 18 24 80 70 60 50 40 30 20 10 –24 GAIN SETTING (dB) –18 –12 –6 0 6 12 18 24 VIN = 1kHz VIN = 20kHz VIN = 50kHz ATTEN: VIN = 2VRMS GAIN: VIN = 2VRMS/GAIN SETTING 80 70 60 50 40 30 20 GAIN SETTING (dB) 0 6 12 18 24 VIN = 50kHz VIN = 20kHz VIN = 1kHz –24 –18 –12 –6 ATTEN: VIN = 0.5VRMS GAIN: VIN = 0.5VRMS/GAIN SETTING Figure 7. Gain Error vs Gain Setting Figure 8. S/N +D vs Gain Setting (VIN/VOUT = 2VRMS) Figure 9. S/N +D vs Gain Setting (VIN/VOUT = 0.5VRMS) Figure 6. CMSG S/N vs Gain Setting GAIN SETTING (dB) 0 6 12 18 24 100 90 80 70 60 50 40 ATTEN: VIN = 8dBm GAIN: VIN = 8dBm/GAIN SETTING 1kHZ –6 –12 –18 –24 1.0 FUNCTIONAL DESCRIPTION The ML2008, ML2009 consists of a coarse gain stage, a fine gain stage, an output buffer, and a µP compatible parallel digital interface. 1.1 Gain Stages The analog input, VIN, goes directly into the op amp input in the coarse gain stage. The coarse gain stage has a gain range of 0 to 22.5dB in 1.5dB steps. The fine gain stage is cascaded onto the coarse section. The fine gain stage has a gain range of 0 to 1.5dB in 0.1dB steps. Both stages can be programmed for either gain or attenuation, thus doubling the effective gain range. The logarithmic steps in each gains stage are generated by placing the input signal across a resistor string of 16 series resistors. Analog switches allow the voltage to be tapped from the resistor string at 16 points. The resistors are sized such that each output voltage is at the proper logarithmic ratio relative to the input signal at the top of the string. Attenuation is implemented by using the resistor string as a simple voltage divider, and gain is implemented by using the resistor string as a feedback resistor around an internal op amp. 1.2 Gain Settings Since the coarse and fine gain stages are cascaded, their gains can be summed logarithmically. Thus, any gain from –24dB to +24dB in 0.1dB steps can be obtained by combining the coarse and fine gain setting to yield the |
同様の部品番号 - ML2009CP |
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同様の説明 - ML2009CP |
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