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MAS9116ASBA-T Datasheet(PDF) 3 Page - Micro Analog systems |
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MAS9116ASBA-T Datasheet(HTML) 3 Page - Micro Analog systems |
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3 / 18 page  3 (18) DA9116.005 22 November, 2005 GENERAL DESCRIPTION Main features MAS9116 is a stereo digital volume control designed for audio systems. The levels of the left and right analog channels are set by the serial interface. Both channels can be programmed independently. Resistor values are decoded to 0.5 dB resolution by using internal multiplexers for a gain from –111.5 to +15.5 dB. The code for –112 dB activates mute for maximum attenuation. MAS9116 operates from single +5V supply and accepts input levels up to ±18V. Interfaces Control information is written into or read back from the internal register via the serial control port. Serial control port consists of a bi-directional pin for data (DATA), chip select pin (XCS) and control clock (CCLK) and supports the serial communication protocol. All control instructions require two bytes of data. To shift the data in CCLK must be pulsed 16 times when XCS is low. The data is shifted into the serial input register on the rising edges of CCLK pulses. The first 8 bits contain address information. The second byte contains the control word. XCS must return to high after the second byte. That is, after the 16th CCLK XCS must be returned to high. See the timing diagram on page 11. The same process takes place for reading the information. XCS will remain low for next 16 CCLK pulses. The data is shifted out on the falling edges of CCLK. When XCS is high, the DATA pin is in high impedance state, which enables DATA pins of other devices to be multiplexed together. On the PCB board the same DATA and CCLK lines can be directed to every MAS9116 chip. If the XCS- pin is not active (low), DATA-pin of that chip is in high-impedance state. This allows using a simple PCB board for multichannel audio systems. Operating modes When power is first applied, power-on reset initializes control registers and sets MAS9116 into mute state. The activation of the device requires that XMUTE pin is high and a control byte with a greater than the default value is written in the gain register. It is possible to return to the mute stage either by setting XMUTE pin low or writing zero (00hex) to the gain register. The device has special test register which is used only for internal testing of the device. It is strongly recommended not to change the initial test register value (00hex) in normal operation. For device testing XMUTE pin is bidirectional. When the test register bit 1 is high, XMUTE pin is output pin. Internal signals can be directed to the pin. Note: In this state the analog output is muted and new gain values cannot be written into the gain register. Changing the gain of the channel When new gain value is written into the gain register the chip will activate zero crossing and delay generator for the selected channel. MAS9116 will wait until rising edge zero crossing is detected in the input signal to ensure that there is no audible click from the output of amplifier when gain is changed. LIN is the input line for the left channel and RIN for the right channel. If there are no zero crossings in the signal, the gain is changed after typical 18ms delay, since then the delay generator will provide about 100ns pulse forcing the new value to be latched. The delay generator´s delay has variation but it is guaranteed that the delay is no longer than 50ms. If new gain value has been written before zero crossing or delay generator´s delay have occured the previous gain value is overwritten, so the previous value is not latched to the output. If it is desired that each gain value will be latched to the output there should be minimum 50ms delay between each gain value writings. Programming both gain registers at the same time sets gain values first to the right channel and then to the left channel. Programming gain into left and right channel using separate commands causes gain values to be set in the same order as the programming. If no zero crossings occur in either channel, the firstly written channel´s gain is changed after first channel´s delay generator´s delay has passed. Only after that second channel´s delay generator is started. In these conditions the first channel gain is set after maximum 50ms delay but second channel is set after maximum 50ms+50ms = 100ms delay. To guarantee that each written gain value will be set in all conditions the maximum programming rate for both channel gains separately is thus 1/100ms = 10 Hz. |
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