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AS1710 Datasheet(PDF) 10 Page - ams AG |
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AS1710 Datasheet(HTML) 10 Page - ams AG |
10 / 17 page www.austriamicrosystems.com Revision 1.06 10 - 17 AS1710/AS1712 Data Sheet - A p p l i c a t i o n I n f o r m a t i o n 60mW Single-Supply Stereo Headphone Driver Two AS1710 amplifiers can be used as a single-supply, stereo headphone driver. The circuit shown in Figure 22 can deliver 60mW per channel with 1% distortion from a single 5V supply. Figure 22. Stereo Headphone Driver Application (with Coupling Capacitor) In Figure 22, CIN and RIN form a high-pass filter that removes the DC bias from the incoming signal. The -3dB point of the high-pass filter is given by: f-3dB = 1/(2 πRINCIN)(EQ 4) Choose gain-setting resistors RIN and RF according to the amount of desired gain, keeping in mind the maximum out- put amplitude. COUT blocks the DC component of the amplifier output, preventing DC current flowing to the load. The output capacitor and the load impedance form a high-pass filter with the -3dB point determined by: f-3dB = 1/(2 πRLOADCOUT)(EQ 5) For a 32 Ω load, a 100µF aluminum electrolytic capacitor gives a low-frequency pole at 50Hz. Rail-to-Rail Input Stage The AS1710/AS1712 CMOS op amps have parallel connected N- and P-channel differential input stages that combine to accept a common-mode range extending to both supply rails. The N-channel stage is active for common-mode input voltages typically greater than (VSS + 1.2V), and the p-channel stage is active for common-mode input voltages typi- cally less than (VDD - 1.2V). Rail-to-Rail Output Stage The minimum output is within millivolts of ground for single- supply operation, where the load is referenced to ground (VSS). Figure 23 shows the input voltage range and the output voltage swing of an AS1710 connected as a voltage fol- lower. The maximum output voltage swing is load dependent although it is guaranteed to be within 500mV of the posi- tive rail (VDD = 2.7V) even with maximum load (32 Ω to ground). VBIAS RIN Headphone Jack to 32 Ω Stereo Headset CIN + – AS1710 RF RIN CIN RF + – AS1710 COUT + COUT + Audio In Left Audio In Right |
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