PDF MAS9116 Data sheet ( Hoja de datos )

Número de pieza	MAS9116
Descripción	Stereo Digital Volume Control
Fabricantes	MAS
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No Preview Available ! www.DataSheet4U.com DA9116.005 22 November, 2005 MAS9116 Stereo Digital Volume Control • Signal Voltage up to ± 18V • Two Independent Channels • Use of Differential DACs Possible • Serial Control Registers DESCRIPTION MAS9116 is a stereo volume control for audio systems, which require high output voltages (AC3). It has a 16-bit serial interface, which controls two audio channels. Simple serial interface allows microcontroller to control many MAS9116 chips on FEATURES • Zero Detection for Gain Changes • Gain Range +15.5db…-111.5dB • 0.5 dB Step Size • Mute Pin and Register • Power On/Off Transient Suppression • Signal Peak Level Comparator with Adjustable Reference BLOCK DIAGRAM the same PCB board. “Clicking” between gain changes is eliminated by changing gain only when zero crossing has been detected from the signal. The use of external operational amplifier provides flexibility for the operating voltage, signal swing, noise floor and cost optimization. APPLICATION • High End Audio Systems • Multichannel Audio Systems RIN RFO R2 R1 RMO R3 VIN RGND DATA CCLK XCS XMUTE LIN VIN ZERO CROSSING CONTROL ZERO CROSSING R2 R3 PEAK DETECTOR 8 DAC PEAK DETECTOR R1 LFO LMO LGND AGND AVCC DVCC DGND MAS9116 VOUT VOUT 1 (17) 1 page REGISTER DESCRIPTION DA9116.005 22 November, 2005 Register Peak Detector Status CR4 Address Byte 7 6 5 43 2 10 X 1 0 1 1 R/W X X Peak Detector Reference CR3 X 1 1 0 0 R/W X X Left Channel Gain CR2 X 1 1 0 1 R/W X X Right Channel Gain CR1 X 1 1 1 0 R/W X X Test, CR5 X 1 1 1 1 R/W X Both Channel Gains X 1 0 01 W X Note 1. Reference voltage is calculated from VREF(CODE)=(0.16+0.0133CODE)VDD X X Data Byte msb…lsb Function Output code 00000000 No overload 00000001 Right overload 00000010 Left overload 00000011 Both overload Input code DAC output 11111111 VREF(255) 11111110 VREF(254) 11111101 VREF(253) •• •• 00000010 VREF(2) 00000001 VREF(1) 00000000 VREF(0) Note 1 Input code Gain dB 11111111 +15.5 11111110 +15.0 11111101 +14.5 •• •• 11100000 0.0 00000010 -111.0 00000001 -111.5 00000000 mute Input code Gain dB 11111111 +15.5 11111110 +15.0 11111101 +14.5 •• •• 11100000 0.0 00000010 -111.0 00000001 -111.5 00000000 mute Reserved Write to both gain registers Address byte bits: • Bit 2 is read/write bit (1=read, 0=write). • X is don’t care, recommended high for low power. Data byte bits: • All registers get their default value 00Hex except CR3 which gets FFHex during power-on reset. • Default value for all bits is zero (00hex). 5 (18) 5 Page DA9116.005 22 November, 2005 Serial Interface Timing TWHC TWLC TRC TFC CCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 THCSH XCS TSSLCH THLCHS TSSHCH DATA (IN) TSDCH THCHD 76 543 2 10 76 543 210 TDCLD TDSZ DATA (OUT) ADDRESS BYTE 7 6 543 210 DATA BYTE APPLICATION INFORMATION Power supply connection and decoupling To get the best performance of the chip all digital activities should be avoided during analog signal processing. Important: Analog (AVDD) and digital (DVDD) supply voltage pins should be always connected directly together to keep them in the same voltage potential. No resistor is allowed in connection between AVDD and DVDD (see supply voltage connection circuit in the Application Note 1 on the next page). Otherwise possible voltage difference could trigger latch-up phenomenom which can damage the device. Due to the same reason also the digital control input voltages should not exceed supply and ground voltages as specified in absolute maximum rating specifications on page 6. These requirements are valid also during the startup when supply voltages are applied. Low noise supply voltages should be used for high quality audio. Supply decoupling capacitors must be located as close to MAS9116 as possible. Opamp produced output offset voltage Opamp non-idealities in input offset voltage and in input bias current both produce offset voltage to the output. Since this offset voltage is gain dependent the gain change step can produce dc voltage steps to the output. To achieve the best audio performance it is recommended to use opamps which have both low input offset voltage and low input bias current characteristics. Burr-Brown OP277 has excellent offset and bias and no trimming is needed. Also Analog Devices OP1177 and AD8610 offer very good offset performance. See table below for these and other recommended op-amps. Manufacturer Analog Devices Analog Devices Analog Devices Texas Instruments (BurrBrown) Linear On-Semi, ST Microelectronics Part Number OP275 OP1177 AD8610 OP277 LT1793 MC33078 Typical Output Offset at Maximum Gain (mV) 8.5 0.51 1.49 0.23 18.5 28.4 11 (18) 11 Page

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