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SSM2135P Datasheet(PDF) 8 Page - Analog Devices |
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SSM2135P Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page SSM2135 REV. D –8– APPLICATION CIRCUITS A Low Noise Stereo Headphone Driver Amplifier Figure 29 shows the SSM2135 used in a stereo headphone driver for multimedia applications with the AD1848, a 16-bit stereo codec. The SSM2135 is equally well suited for the serial- bused AD1849 stereo codec. The headphone’s impedance can be as low as 25 Ω, which covers most commercially available high fidelity headphones. Although the amplifier can operate at up to ±18 V supply, it is just as efficient powered by a single +5 V. At this voltage, the amplifier has sufficient output drive to deliver distortion-free sound to a low impedance headphone. 10µF 4 6 5 8 7 0.1µF 1/2 SSM2135 10µF +5V 1/2 SSM2135 0.1µF 1 2 3 8.66k Ω 10k Ω 0.1µF 40 35/36 32 41 L CH R CH AGND 34/37 8.66k Ω 10k Ω VCC GND VREF ROUT AD1848 LOUT 470µF 470µF Figure 29. A Stereo Headphone Driver for Multimedia Sound Codec Figure 30 shows the total harmonic distortion characteristics versus frequency driving into a 32 Ω load, which is a very typical impedance for a high quality stereo headphone. The SSM2135 has excellent power supply rejection, and as a result, is tolerant of poorly regulated supplies. However, for best sonic quality, the power supply should be well regulated and heavily bypassed to minimize supply modulation under heavy loads. A minimum of 10 µF bypass is recommended. Figure 30. Headphone Driver THD+N vs. Frequency into a 32 Ω Load (V S = +5 V, with 80 kHz Low-Pass Filter) A Low Noise Microphone Preamplifier The SSM2135’s 4.7 nV/ √Hz input noise in conjunction with low distortion makes it an ideal device for amplifying low level signals such as those produced by microphones. Figure 31 illus- trates a stereo microphone input circuit feeding a multimedia sound codec. As shown, the gain is set at 100 (40 dB), although it can be set to other gains depending on the microphone output levels. Figure 32 shows the preamplifier’s harmonic distortion performance with 1 V rms output while operating from a single +5 V supply. The SSM2135 is biased to 2.25 V by the VREF pin of the AD1848 codec. The same voltage is buffered by the 2N4124 transistor to provide “phantom power” to the microphone. A typical electret condenser microphone with an impedance range of 100 Ω to 1 kΩ works well with the circuit. This power booster circuit may be omitted for dynamic microphone elements. L CHANNEL MIC IN 10µF 4 6 5 8 7 10µF 1/2 SSM2135 10µF +5V 1/2 SSM2135 0.1µF 1 2 3 10k Ω 10k Ω 100 Ω R CHANNEL MIC IN 100 Ω 0.1µF 29 35/36 34/37 +5V LMIC VCC GND VREF RMIC AD1848 32 28 10k Ω 10k Ω +5V 2N4124 10µF 2k Ω 2k Ω Figure 31. Low Noise Microphone Preamp for Multimedia Sound Codec Figure 32. MIC Preamp THD+N Performance (VS = +5 V, AV = 40 dB, VOUT = 1 V rms, with 80 kHz Low-Pass Filter) |
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