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TPA3120D2PWPR Datasheet(PDF) 10 Page - Texas Instruments |
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TPA3120D2PWPR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page www.ti.com INPUT RESISTANCE Ci IN Zi Zf Input Signal f= 1 2 Z C p i i (1) TPA3120D2 SLOS507 – MARCH 2007 APPLICATION INFORMATION (continued) For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 8 k Ω, which is the absolute minimum input impedance of the TPA3120D2. At the higher gain settings, the input impedance could increase as high as 72 k Ω Table 1. Gain Setting INPUT IMPEDANCE AMPLIFIER GAIN (dB) (k Ω) GAIN1 GAIN0 TYPICAL TYPICAL 0 0 20 10 0 1 26 15 1 0 32 30 1 1 36 60 Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 10 k Ω± 20%, to the largest value, 60 k Ω± 20%. As a result, if a single capacitor is used in the input high-pass filter, the -3 dB or cutoff frequency may change when changing gain steps. The -3-dB frequency can be calculated using Equation 1. Use the ZI values given in Table 1. 10 Submit Documentation Feedback |
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