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SSM2160P Datasheet(PDF) 9 Page - Analog Devices |
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SSM2160P Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page SSM2160/SSM2161 –9– REV. 0 + + V+ 0.1µF 10µF 0.1µF 10µF 3 1 2 12 13 DGND V– VREF AGND V+ SSM2160 CHnIN REF OUT Figure 16. Single Supply Operation with VREF Buffer Signal Chain Considerations The SSM2160 is capable of providing an extremely wide control range, from –127 dB of attenuation (limited only by the noise floor) to +31 dB of gain. When configuring the system, the SSM2160 should be in the signal chain where input signals allow the minimum VCA gain to be used, thus ensuring the lowest distortion operation. In consumer products, sources that supply line level signals include FM/AM Tuner, Phono Preamp, Cassette Deck, CD, Laserdisc, VCR, LINE, AUX and Micro- phone Preamp. Figure 17 shows a typical application where the SSM2160 has been placed between a surround-sound decoder and the power amplification stages. This allows the user to adjust both volume and balance between six speakers through the use of the Master and Channel controls. FM/AM TUNER PHONO PREAMP CASSETTE DECK COMPACT DISK LASER DISK VCR MICROPHONE MUX SURROUND SOUND DECODER SSM2160 TO SPEAKERS POWER AMPS VOLUME AND BALANCE CONTROLS LINE LEVEL INPUTS – STEREO PAIRS Figure 17. Typical Signal Chain Using the SSM2160 Digital Control Range Plan The SSM2160 may be modelled as six ganged potentiometers followed by individual programmable gain channel amplifiers, as shown in Figure 18. In actuality, each channel’s signal level is set by a VCA that can give gain or attenuation, depending upon the control voltage supplied. The input potentiometers have a maximum gain 0 dB (unity), a minimum gain of –127 dB, and change in 1 dB steps. The channel amplifiers each have mini- mum gain of 0 dB and a maximum gain of +31 dB and also change in 1 dB steps. The data settings for the attenuation of the master “potentiometer” and the channel “amplifier” are shown in Table II. OUTPUT CHANNEL INPUT 0dB –127dB 31dB 0dB MASTER Figure 18. Potentiometer Representation of SSM2160 (One Channel Only) Table II. Master and Channel Control Data dB Hex Binary Master Min Atten 0 7F 1111111 Max Atten –127 00 0000000 Channel Max Gain +31 00 00000 Midgain +15 10 10000 Min Gain 0 1F 11111 When using Channel controls as balance controls, the center would be with Channel = 10h (or 0Fh if desired). Increasing the gain to the maximum would occur at Channel = 00h. Reducing the gain to minimum would occur at Channel = 1Fh. SELECTION ADDRESS MODE ADDRESS DATA MODE DATA 7-BIT MASTER DAC 5-BIT CHANNEL DAC 1 5-BIT CHANNEL DAC 2 5-BIT CHANNEL DAC 3 5-BIT CHANNEL DAC 4 5-BIT CHANNEL DAC 5 5-BIT CHANNEL DAC 6 NO DAC SELECTED 1 1 1 1 1 1 1 1 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 X X X X X X X X = "DON'T CARE" SHADED AREA IS DATA 0 = MUTE, 1 = UN-MUTE MSB MSB LSB LSB XXXXX Figure 19. Interface Characteristics, DAC Address/Data Decoding Truth Table |
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