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SSM2135P Datasheet(PDF) 9 Page - Analog Devices |
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SSM2135P Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page SSM2135 REV. D –9– An 18-Bit Stereo CD-DAC Output Amplifier The SSM2135 makes an ideal single supply stereo output amplifier for audio D/A converters because of its low noise and distortion. Figure 33 shows the implementation of an 18-bit ste- reo DAC channel. The output amplifier also provides low-pass filtering for smoothing the oversampled audio signal. The filter’s cutoff frequency is set at 22.5 kHz and it has a maximally flat response from dc to 20 kHz. As mentioned above, the amplifier’s outputs can drive directly into a stereo headphone that has impedance as low as 25 Ω with no additional buffering required. 6 7 5 100pF 330pF 16 15 14 13 12 11 10 9 18-BIT DAC V REF 18-BIT SERIAL REG. VOL AGND 18-BIT SERIAL REG. 18-BIT DAC V REF VOR VBL DGND VBR LR DR LL DL CK V L V S 1 2 3 4 5 6 7 8 AD1868 220 µF 47k Ω RIGHT CHANNEL OUTPUT 330pF 100pF 220 µF LEFT CHANNEL OUTPUT +5V SUPPLY 1 3 2 4 8 1/2 SSM2135 1/2 SSM2135 47k Ω 7.68k Ω 7.68k Ω 7.68k Ω 7.68k Ω 9.76k Ω 9.76k Ω Figure 33. +5 V Stereo 18-Bit DAC A Single Supply Differential Line Driver Signal distribution and routing is often required in audio systems, particularly portable digital audio equipment for professional applications. Figure 34 shows a single supply line driver circuit that has differential output. The bottom amplifier provides a 2 V dc bias for the differential amplifier in order to maximize the output swing range. The amplifier can output a maximum of 0.8 V rms signal with a +5 V supply. It is capable of driving into 600 Ω line termination at a reduced output amplitude. 1µF 6 5 8 7 1/2 SSM2135 0.1µF 100 Ω 1/2 SSM2135 1 2 3 10µF+0.1µF +5V 4 1k Ω 8 1 3 2 4 DIFFERENTIAL AUDIO OUT 2.5k Ω 7.5k Ω 5k Ω +5V 10k Ω 2.0V 1k Ω +5V 1/2 SSM2135 1k Ω 100µF AUDIO IN Figure 34. Single Supply Differential Line Driver A Single Supply Differential Line Receiver Receiving a differential signal with minimum distortion is achieved using the circuit in Figure 35. Unlike a difference amplifier (a subtractor), the circuit has a true balanced input impedance regardless of input drive levels. That is, each input always presents a 20 k Ω impedance to the source. For best common-mode rejection performance, all resistors around the differential amplifier must be very well matched. Best results can be achieved using a 10 k Ω precision resistor network. 1µF 6 5 8 7 1/2 SSM2135 10µF +5V 0.1µF 20k Ω 1/2 SSM2135 1 2 3 10µF+0.1µF +5V 4 2.0V 1/2 SSM2135 DIFFERENTIAL AUDIO IN 8 1 3 2 4 +5V 2.5k Ω AUDIO OUT 20k Ω 20k Ω 10k Ω 10k Ω 100 Ω 5k Ω 7.5k Ω 10 Ω Figure 35. Single Supply Balanced Differential Line Receiver A Pseudo-Reference Voltage Generator For single supply circuits, a reference voltage source is often required for biasing purposes or signal offsetting purposes. The circuit in Figure 36 provides a supply splitter function with low output impedance. The 1 µF output capacitor serves as a charge reservoir to handle a sudden surge in demand by the load as well as providing a low ac impedance to it. The 0.1 µF feedback capacitor compensates the amplifier in the presence of a heavy capacitive load, maintaining stability. The output can source or sink up to 12 mA of current with +5 V supply, limited only by the 100 Ω output resistor. Reduc- ing the resistance will increase the output current capability. Alternatively, increasing the supply voltage to 12 V also improves the output drive to more than 25 mA. C1 0.1µF R2 5k Ω C2 1µF R4 100 Ω OUTPUT VS + 2 1/2 SSM2135 1 8 4 2 R3 2.5k Ω 3 R1 5k Ω VS + = +5V → +12V Figure 36. Pseudo-Reference Generator |
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