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MAX4232AUA+T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4232AUA+T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 27 page For example, the circuit in Figure 1 has a package power dissipation of 196mW: where: VDC = the DC component of the output voltage. IDC = the DC component of the output current. VPEAK = the highest positive excursion of the AC com- ponent of the output voltage. IPEAK = the highest positive excursion of the AC com- ponent of the output current. Therefore: PIC(DISS) = VRMS IRMS COS θ = 196mW Adding a coupling capacitor improves the package power dissipation because there is no DC current to the load, as shown in Figure 2: Therefore: PIC(DISS) = VRMS IRMS COS θ = 15.6mW If the configuration in Figure 1 were used with all four of the MAX4234 amplifiers, the absolute maximum power- dissipation rating of this package would be exceeded (see the Absolute Maximum Ratings section). 60mW Single-Supply Stereo Headphone Driver Two MAX4230/MAX4231s can be used as a single-sup- ply, stereo headphone driver. The circuit shown in Figure 2 can deliver 60mW per channel with 1% distor- tion from a single 5V supply. The input capacitor (CIN), in conjunction with RIN, forms a highpass filter that removes the DC bias from the incoming signal. The -3dB point of the highpass filter is given by: f RC dB IN IN − = 3 1 2 π V I + I 2 RMS RMS PEAK ≅ == ≅= + = . . ./ . V V V IA V mA PEAK RMS DC RMS 2 10 2 0 707 0 10 32 2 22 1 Ω RMS DD DC RMS PEAK V V I + I 2 ≅− ()+ =− + = ≅= + = . . . . . ./ . V VV V V I VV mA PEAK RMS DC RMS 2 36 18 10 2 2 507 18 32 10 32 2 78 4 Ω Ω High-Output-Drive, 10MHz, 10V/µs, Rail-to-Rail I/O Op Amps with Shutdown in SC70 _______________________________________________________________________________________ 9 RIGHT AUDIO INPUT LEFT AUDIO INPUT CIN CIN RIN RIN RF COUT VBIAS COUT HEADPHONE JACK TO 32 Ω STEREO HEADSET RF MAX4230 Figure 2. Circuit Example: Adding a Coupling Capacitor Greatly Reduces Power Dissipation of its Package 3.6V VIN = 2VP-P R C 32 Ω R MAX4230 MAX4231 Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation Circuit Example |
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