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LM1972 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM1972 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 22 page LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 LM1972 Channel Attenuation vs Digital Step Value (Programmed 2.0dB Steps) Figure 18. LM1972 2.0dB Attenuation Step Scheme Figure 19. Mono Panning Circuit INPUT IMPEDANCE The input impedance of a μPot is constant at a nominal 40 kΩ. To eliminate any unwanted DC components from propagating through the device it is common to use 1 μF input coupling caps. This is not necessary, however, if the dc offset from the previous stage is negligible. For higher performance systems, input coupling caps are preferred. OUTPUT IMPEDANCE The output of a μPot varies typically between 25 kΩ and 35 kΩ and changes nonlinearly with step changes. Since a μPot is made up of a resistor ladder network with a logarithmic attenuation, the output impedance is nonlinear. Due to this configuration, a μPot cannot be considered as a linear potentiometer, but can be considered only as a logarithmic attenuator. It should be noted that the linearity of a μPot cannot be measured directly without a buffer because the input impedance of most measurement systems is not high enough to provide the required accuracy. Due to the low impedance of the measurement system, the output of the μPot would be loaded down and an incorrect reading will result. To prevent loading from occurring, a JFET input op amp should be used as the buffer/amplifier. The performance of a μPot is limited only by the performance of the external buffer/amplifier. MUTE FUNCTION One major feature of a μPot is its ability to mute the input signal to an attenuation level of 104dB as shown in Figure 16. This is accomplished internally by physically isolating the output from the input while also grounding the output pin through approximately 2 k Ω. Copyright © 1995–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM1972 |
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