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SSM2019BRNZ Datasheet(PDF) 6 Page - Analog Devices |
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SSM2019BRNZ Datasheet(HTML) 6 Page - Analog Devices |
6 / 10 page REV. SSM2019 –6– V+ V– OUT RG +IN –IN RG1 RG2 SSM2019 REFERENCE G = VOUT (+IN) – (–IN) = 10k RG + 1 Figure 1. Basic Circuit Connections GAIN The SSM2019 only requires a single external resistor to set the voltage gain. The voltage gain, G, is: G k R G =+ 10 1 W and the external gain resistor, RG , is: R k G G = 10 1 W – For convenience, Table I lists various values of RG for common gain levels. Table I. Values of RG for Various Gain Levels RG ( )AV dB NC 1 0 4.7 k 3.2 10 1.1 k 10 20 330 31.3 30 100 100 40 32 314 50 10 1000 60 The voltage gain can range from 1 to 3500. A gain set resistor is not required for unity gain applications. Metal film or wire-wound resistors are recommended for best results. The total gain accuracy of the SSM2019 is determined by the tolerance of the external gain set resistor, RG, combined with the gain equation accuracy of the SSM2019. Total gain drift combines the mismatch of the external gain set resistor drift with that of the internal resistors (20 ppm/ ∞C typ). Bandwidth of the SSM2019 is relatively independent of gain, as shown in Figure 2. For a voltage gain of 1000, the SSM2019 has a small-signal bandwidth of 200 kHz. At unity gain, the bandwidth of the SSM2019 exceeds 4 MHz. 1k 10M 60 10k 100k 1M 40 20 0 VS = 15V TA = 25 C Figure 2. Bandwidth for Various Values of Gain NOISE PERFORMANCE The SSM2019 is a very low noise audio preamplifier exhibiting a typical voltage noise density of only 1 nV/ ÷Hz at 1 kHz. The exceptionally low noise characteristics of the SSM2019 are in part achieved by operating the input transistors at high collector currents since the voltage noise is inversely proportional to the square root of the collector current. Current noise, however, is directly proportional to the square root of the collector current. As a result, the outstanding voltage noise performance of the SSM2019 is obtained at the expense of current noise performance. At low preamplifier gains, the effect of the SSM2019 voltage and current noise is insignificant. The total noise of an audio preamplifier channel can be calculated by: Ee i R e nn n S t =+ + 2 2 2 () where: En = total input referred noise en = amplifier voltage noise in = amplifier current noise RS = source resistance et = source resistance thermal noise For a microphone preamplifier, using a typical microphone impedance of 150 W, the total input referred noise is: EnV Hz pA Hz nV Hz nV Hz kHz n =+ ¥ + = () ( / ) ( . / ) ./ @ 12 150 1 6 193 1 2 22 W where: en = 1 nV/ ÷Hz @ 1 kHz, SSM2019 en in = 2 pA/ ÷Hz @ 1 kHz, SSM2019 in RS = 150 W, microphone source impedance et = 1.6 nV/ ÷Hz @ 1 kHz, microphone thermal noise This total noise is extremely low and makes the SSM2019 virtually transparent to the user. A |
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