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INA163 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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INA163 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 11 page INA163 SBOS177B 8 www.ti.com R 5 2.2k Ω R 6 (2) 5 Ω R 7 (3) 1k Ω A 1 INA163 + 47mF R 3 47k Ω R 2 6.8k Ω R 1 6.8k Ω Phantom Power +48V + + R 4 2.2k Ω C 1 (1) 47mF 60V C 2 (1) 47mF 60V A 2 OPA134 0.1mF +15V 0.1mF 0.1mF 1M Ω V O - 15V Optional DC output control loop. 8 9 10 1 2 3 Female XLR Connector NOTES: (1) Use non- polar capacitors if phantom power is to be turned off. (2) R 6 sets maximum gain. (3) R 7 sets minimum gain. 1N4148 FIGURE 5. Phantom-Powered Microphone Preamplifier. MICROPHONE AMPLIFIER Figure 5 shows a typical circuit for a professional microphone input amplifier. R1 and R2 provide a cur- rent path for conventional 48V phantom power source for a remotely located microphone. An optional switch allows phantom power to be disabled. C1 and C2 block the phantom power voltage from the INA163 input circuitry. Non-polarized capacitors should be used for C1 and C2 if phantom power is to be disabled. R4 and R5 provide a path for input bias current of the INA163. Input offset current (typically 100nA) creates a DC differential input voltage that will produce an output offset voltage. This is generally the dominant source of output offset voltage in this application. With a maxi- mum gain of 1000 (60dB), the output offset voltage can be several volts. This may be entirely acceptable if the output is AC-coupled into the subsequent stage. An alternate technique is shown in Figure 5. An inexpen- sive FET-input op amp in a feedback loop drives the DC output voltage to 0V. A2 is not in the audio signal path and does not affect signal quality. Gain is set with a variable resistor, R7, in series with R6. R6 determines the maximum gain. The total resis- tance, R6 + R7, determines the lowest gain. A special reverse-log taper potentiometer for R7 can be used to create a linear change (in dB) with rotation. |
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