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SSM2161S-REEL Datasheet(PDF) 8 Page - Analog Devices |
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SSM2161S-REEL Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page SSM2160/SSM2161 –8– REV. 0 APPLICATIONS INFORMATION General The SSM2160 and SSM2161 are six and four channel volume controls intended for multichannel audio applications. While dual channel controls sufficed for “stereo” applications, the rapidly emerging home theater “surround sound” and auto sound venues demand both six and four channel high perfor- mance controls. The following information applies equally to the SSM2160 and SSM2161, except where noted. Line level signals are fed to the six high impedance inputs. The system microcontroller sets the gain of the six channels via a three or four wire data bus. In a home theater receiver, the outputs may be fed to the power amplifiers or buffered and connected to pre- out/amp-in ports on the rear panel. Refer to Figure 17 for a typical signal chain using the SSM2160. The Master control serves the “Volume” control function, and the channel control serves the “Balance” function. The six channel capability allows complete control of the front left, front right, center, rear left, rear right, and sub-bass audio channels. Power Supplies vs. Signal Levels The SSM2160 can be operated from dual supplies from ±5V to ±10 V and from single supplies from +10 V to +20 V. The SSM2161 can be operated from dual supplies from ±4.25 V to ±10 V for automotive applications and from single supplies from +8.5 V to +20 V. In order to keep power dissipation to a minimum, use the minimum power supply voltages that will support the maximum input and output signal levels. The peak- to-peak output signal level must not exceed 1/4 of the total power supply span, from V+ to V–. This restriction applies for all conditions of input signal levels and gain/attenuation settings. Table I shows supply voltages for several typical output signal levels for both devices. An on-chip buffered voltage divider provides the correct analog common voltage for single supply applications. Table I. Signal Levels vs. Power Supplies SSM2160 Max Output, Max Output, V rms (V p-p) dBu Single +VS Dual VS 0.9 (2.5) +1.3 10 V ±5 V 1.1 (3.0) +3.0 12 V ±6 V 1.3 (3.7) +4.5 15 V ±7.5 V 1.8 (5.0) +7.3 20 V ±10 V SSM2161 Max Output, Max Output, V rms (V p-p) dBu Single +VS Dual VS 0.75 (2.1) +1.0 8.5 V ±4.25 V 1.1 (3.0) +3.0 12 V ±6 V 1.3 (3.7) +4.5 15 V ±7.5 V 1.8 (5.0) +7.3 20 V ±10 V Dual Power Supplies As shown in Figure 14, the AGND pin should be connected to ground and VREF should be left floating. The digital ground pin, DGND, should always be connected to ground for either single- or dual-supply configurations. Pins 1 and 12 should each have a 10 µF capacitor connected to ground, with a 0.1 µF capacitor placed as close as possible to the SSM2160 device to help reduce the effects of high frequency power supply noise. When a switching power supply is used, or if the power supply lines are noisy, additional filtering of the power supply lines may be required. + 1 2 V+ 0.1µF 10µF V– 10µF 12 13 DGND V– VREF AGND V+ SSM2160 + 0.1µF Figure 14. Dual Supply Configuration Single Power Supply When a single supply is used, it is necessary to connect AGND (Pin 2) to VREF (Pin 3) as shown in Figure 15. VREF supplies a voltage midway between the V+ and V– pins from a buffered resistive divider. When supplying this reference to stages ahead of the SSM2160 (to eliminate the need for input dc blocking capacitors, for example), the use of an additional external buffer, as shown in Figure 16 may be necessary to eliminate any noise pickup. + + V+ 0.1µF 10µF 0.1µF 10µF 3 1 2 12 13 DGND V– VREF AGND V+ SSM2160 Figure 15. Single Supply Configuration |
Similar Part No. - SSM2161S-REEL |
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Similar Description - SSM2161S-REEL |
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