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MAX9716 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX9716 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page Adjustable Gain Gain-Setting Resistors External feedback resistors set the gain of the MAX9716 and MAX9717A. Resistors RF and RIN (see Figure 2) set the gain of the amplifier as follows: Where AV is the desired voltage gain. Hence, an RIN of 20k Ω and an RF of 20kΩ yields a gain of 2V/V, or 6dB. RF can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. The gain of the MAX9717 in a single-ended output configuration is half the gain when configured as BTL output. Choose RF between 10k Ω and 50kΩ for the MAX9716 and MAX9717A. Gains for the MAX9717B/C/D are set internally. Input Filter CIN and RIN form a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capaci- tor allows the amplifier to bias the signal to an optimal DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is: Setting f-3dB too high affects the low-frequency response of the amplifier. Use capacitors with dielectrics that have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with high- voltage coefficients, such as ceramics, can increase distortion at low frequencies. Output-Coupling Capacitor The MAX9717 require output-coupling capacitors to operate in single-ended (headphone) mode. The out- put-coupling capacitor blocks the DC component of the amplifier output, preventing DC current from flowing to the load. The output capacitor and the load impedance form a highpass filter with a -3dB point determined by: As with the input capacitor, choose COUT such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the amplifier’s low-fre- quency response. Load impedance is a concern when choosing COUT. Load impedance can vary, changing the -3dB point of the output filter. A lower impedance increases the corner frequency, degrading low-fre- quency response. Select COUT such that the worst- case load/COUT combination yields an adequate response. Select capacitors with low ESR to minimize resistive losses and optimize power transfer to the load. Differential Input The MAX9716 can be configured for a differential input. The advantage of differential inputs is that any com- mon-mode noise is attenuated and not passed through the amplifier. This input improves noise rejection and provides common-mode rejection (Figure 3). External components should be closely matched for high CMRR. Figure 4 shows the MAX9716 configured for a differential input. f RC dB L OUT − = 3 1 2 π f RC dB IN IN − = 3 1 2 π A R R V F IN = ⎛ ⎝⎜ ⎞ ⎠⎟ 2 Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers ______________________________________________________________________________________ 11 OUT- OUT+ MAX9716 RF IN- IN+ BIAS RIN CIN AUDIO INPUT Figure 2. Setting the MAX9716/MAX9717A Gain FREQUENCY (Hz) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k VRIPPLE = 200mVP-P RL = 8 Ω CBIAS = 1 µF COMMON-MODE REJECTION RATIO vs. FREQUENCY Figure 3. CMRR with Differential Input |
Similar Part No. - MAX9716 |
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Similar Description - MAX9716 |
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