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SSM2220SZ Datasheet(PDF) 9 Page - Analog Devices |
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SSM2220SZ Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page Data Sheet SSM2220 Rev. C | Page 9 of 12 AD8671 2 3 1 8 4 10µF + + 0.01µF 0.01µF 10µF +15V –15V VOUT LED Q1 SSM2220 Q2 2N29007A 18 36 27 R1 250Ω VIN R2 27kΩ R3 5kΩ R4 5kΩ R6 100Ω R5 100Ω C1 50pF THD < 0.005% 20Hz TO 20kHz 0.5nV/ Hz 1/f CORNER < 1Hz Figure 18. Low Noise Microphone Preamplifier LOW NOISE MICROPHONE PREAMPLIFIER Figure 18 shows a microphone preamplifier that consists of an SSM2220 and a low noise op amp. The input stage operates at a relatively high quiescent current of 2 mA per side, which reduces the SSM2220 transistor voltage noise. The 1/f corner is less than 1 Hz. Total harmonic distortion is under 0.005% for a 10 V p-p signal from 20 Hz to 20 kHz. The preamp gain is 100, but can be modified by varying R5 or R6 (VOUT/VIN = R5/R6 + 1). A total input stage emitter current of 4 mA is provided by Q2. The con- stant current in Q2 is set by using the forward voltage of a GaAsP LED as a reference. The difference between this voltage and the VBE of a silicon transistor is predictable and constant (to a few percent) over a wide temperature range. The voltage difference, approximately 1 V, is dropped across the 250 Ω resistor, which produces a temperature stabilized emitter current. |
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