STA30813TR

STA308 MULTICHANNEL DIGITAL AUDIO PROCESSOR WITH DDX™ „ 8 DDXTM Channels Capability (24 bit) „ From 32kHz to 192kHz Input Sample Rates Supported „ Volume Control from 0 to -127 dB (0.5 dB steps) „ Variable Digital Gain from 0 to 24dB (0.5dB steps) with Digital Limiter Functionality and Variable Attack and Release Time TQFP64 ORDERING NUMBER: STA308 „ I2S Inputs and Outputs „ Individual Channel and Master Gain/ Attenuation „ Individual Channel Mute and Zero Input Detect Auto-Mute „ Selectable Serial Audio Data Interface „ Bass/Treble Controls „ Channel Mapping of any Input to any Processing/DDXTM Channel „ Active Crossover Capability „ DC Blocking Selectable High-Pass Filter „ Selectable Bass Management on Channel 6 „ Selectable Adjacent Channel Mixing Capability „ Selectable DDXTM Headphone Output on Channels 7 & 8 „ Selectable Clock Input Ratio „ Selectable De-emphasis „ Selectable DDXTM Ternary, or Binary PWM output „ AM Interference Reduction Mode „ I2C Control u d o ) s ( ct t e l o r P e bs O April 2010 c u d DESCRIPTION ) s t( o r P The STA308 is a single chip solution for digital audio processing and control in multi-channel applications. It provides output capabilities for DDXTM (Direct Digital Amplification). In conjunction with a DDXTM power device, it provides high-quality, high-efficiency, all digital amplification. The device is extremely versatile allowing for input of most digital formats including 6.1 channel and 192kHz, 24-bit DVD-Audio. e t le o s b O - The internal 24-bit DSP allows for high resolution processing at all standard input sample frequencies. Processing includes volume control, filtering, bass management, gain compression/limiting and PCM and DDXTM outputs. Filtering includes five user-programmable 28-bit biquads for EQ per channel, as well as bass, treble and DC blocking. External clocking can be provided at 4 different ratios of the input sample frequency. All sample frequencies are upsampled for processing. Each internal processing channel can receive any input channel, allowing flexibility and the ability to perform active digital crossover for powered loudspeaker systems. The serial audio data interface accepts many different formats, including the popular I2S format. Eight channels of DDX processing are performed. 1/33 STA308 BLOCK DIAGRAM SCL SA SDA MVO OUT1A/B LRCKI BICKI 2 IC SERIAL DATA IN SDI12 SDI34 OUT2A/B OUT3A/B OVERSAMPLING DDX SYSTEM CONTROL SDI56 OUT4A/B OUT5A/B OUT6A/B SDI78 OUT7A/B VARIABLE OVERSAMPLING CHANNEL MAPPING TREBLE, BASS, EQ (BIQUADS) OUT8A/B VOLUME LIMITING SYSTEM TIMING PLL PLLB XTI VARIABLE DOWNSAMPLING POWER DOWN CKOUT PWDN LRCKO Scale & Mix 8 Inputs From I2S Channel Mapping o r P e t e l o s b O 2/33 ) s ( ct 1x,2x,4x Interp SDO56 EAPD c u d o s b O BME Biquads B/T o r P e t le Bass Management (Channel 6 only) Interp_Rate SDO34 SDO78 Figure 1. Signal Flow Diagram Channels 1-8 1st Stage Interpolation Output BICKO SDO12 SERIAL DATA OUT Volume Limiter du Noise & Distortion Reduction 2x Interp PWM DDX (Channels 7&8 only) Headphone DDX Output ) s t( STA308 OUT1_B OUT1_A EAPD VDD3 GND BICKO VDD LRCKO SDO_12 SDO_34 VDD3 GND VDD SDO_56 SDO_78 PWDN IN CONNECTION (Top view) 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 MVO 1 48 OUT2_A GND 2 47 OUT2_B VDD3 3 46 VDD GND 4 45 GND VDD 5 44 VDD3 SDI_78 6 43 OUT3_A SDI_56 7 42 OUT3_B SDI_34 8 41 OUT4_A SDI_12 9 40 OUT4_B LRCKI 10 39 OUT5_A BICKI 11 38 OUT5_B VDD3 12 37 VDD GND 13 36 GND VDD 14 35 VDD3 RESET 15 34 OUT6_A PLLB 16 33 OUT6_B PIN 1 NAME MVO 3, 12, 24, 28, 35, 44, 52, 59 2, 4, 13, 27, 36, 45, 53, 60 5, 14, 26, 37, 46, 54, 61 VDD3 3.3V Digital Supply GND Digital Ground 6 7 8 9 10 11 15 SDI_78 SDI_56 SDI_34 SDI_12 LRCKI BICKI RESET VDD t e l o o r P e O bs OUT7_A DESCRIPTION Master Volume Override (t s) o s b O - 2.5V Digital Supply c u d I I I I I I I Input I2S Serial Data Channels 7 & 8 Input I2S Serial Data Channels 5 & 6 Input I2S Serial Data Channels 3 & 4 Input I2S Serial Data Channels 1 & 2 Inputs I2C Left/Right Clock Inputs I2C Serial Clock Global Reset 16 PLLB I PLL Bypass 17 SA I Select Address (I2C) 18 SDA I/O I2C Serial Data 19 SCL I I2C Serial Clock c u d D02AU1356 e t le PIN FUNCTION TYPE I OUT7_B OUT8_A VDD3 OUT8_B GND VDD CKOUT VDD3 GNDA VDDA FILTER_PLL XTI SCL SA SDA 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ) s t( o r P PAD TYPE CMOS Input Buffer with Pull-Down 3.3V Digital Power Supply Voltage (pad ring) Digital Ground 2.5V Digital Power Supply Voltage (core + ring) 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Schmitt Trigger Input Buffer CMOS Input Buffer with Pull-Down CMOS Input Buffer with Pull-Down Bidirectional Buffer: 5V Tolerant TTL Schmitt Trigger Input; 3.3V Capable 2 mA Slew-rate control Output; 5V Tolerant TTL Schmitt Trigger Input Buffer 3/33 STA308 PIN FUNCTION (continued) PIN 20 NAME XTI 21 22 FILTER_PLL VDDA 23 25 GNDA CKOUT O PLL Ground Clock Output 29 OUT8_B O PWM Channel 8 Output B 30 OUT8_A O PWM Channel 8 Output A 31 OUT7_B O PWM Channel 7 Output B 32 OUT7_A O PWM Channel 7 Output A 33 OUT6_B O PWM Channel 6 Output B 34 OUT6_A O PWM Channel 6 Output A 38 OUT5_B O PWM Channel 5 Output B 39 OUT5_A O PWM Channel 5 Output A 40 OUT4_B O PWM Channel 4 Output B 41 OUT4_A O PWM Channel 4 Output A 42 OUT3_B O PWM Channel 3 Output B 43 OUT3_A O PWM Channel 3 Output A 47 OUT2_B O PWM Channel 2 Output B 48 OUT2_A O 49 OUT1_B O 50 OUT1_A DESCRIPTION Crystal Oscillator Input (Clock Input) PLL Filter PLL 2.5V Supply ) s ( ct e t le o s b O - PWM Channel 2 Output A PWM Channel 1 Output B EAPD O External Amplifier Power Down BICKO O Output I2S Serial Clock 56 LRCKO O Output I2S Left/Right Clock 57 SDO_12 O Output I2S Serial Data Channels 1 & 2 58 SDO_34 O Output I2S Serial Data Channels 3 & 4 62 SDO_56 O Output I2S Serial Data Channels 5 & 6 63 SDO_78 O Output I2S Serial Data Channels 7 & 8 64 PWDN I Device Powerdown r P e t e l o 55 s b O O PWM Channel 1 Output A PAD TYPE 3.3V Tolerant TTL Schmitt Trigger Input Buffer Analog Pad 2.5V Analog Power Supply Voltage Analog Ground 3.3V Capable TTL Tristate 4mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 5V Tolerant TTL Schmitt Trigger Input Buffer c u d u d o 51 4/33 TYPE I o r P ) s t( STA308 ABSOLUTE MAXIMUM RATINGS Symbol Parameter VDD_3.3 3.3V I/O Power Supply VDD_2.5 2.5V Logic Power Supply Value Unit -0.5 to 4 V -0.5 to 3.3 V Vi Voltage on input pins -0.5 to (VDD+0.5) V Vo Voltage on output pins -0.5 to (VDD+0.3) V Tstg Storage Temperature -40 to +150 °C Tamb Ambient Operating Temperature -20 to +85 °C THERMAL DATA Symbol Rthj-amb Parameter Value Thermal resistance Junction to Ambient 85 RECOMMENDED DC OPERATING CONDITIONS Symbol VDD_3.3 I/O Power Supply VDD_2.5 Logic Power Supply so Operating Junction Temperature Tj e t le Parameter ) s ( ct b O - c u d ) s t( Unit °C/W o r P Value Unit 3.0 to 3.6 V 2.3 to 2.7 V -20 to +125 °C u d o r P e t e l o s b O 5/33 STA308 ELECTRICAL CHARACTERISTCS (VDD3 = 3.3V ± 0.3V; VDD = 2.5V ± 0.2V; Tamb = 0 to 70 °C; unless otherwise specified) GENERAL INTERFACE ELECTRICAL CHARACTERISTICS Symbol Parameter Test Condition Min. Typ. Max. Unit Note Iil Low Level Input no pull-up Vi = 0V 1 µA 1 Iih High Level Input no pull-down Vi = VDD3 2 µA 1 IOZ Tristate output leakage without pullup/down Vi = VDD3 2 µA 1 Vesd Electrostatic Protection Leakage < 1µA V 2 1000 Note 1: The leakage currents are generally very small, < 1na. The values given here are maximum after an electrostatic stress on the pin. Note 2: Human Body Model; except for VDD pins vs GND that substain 100V DC ELECTRICAL CHARACTERISTICS: 3.3V BUFFERS Symbol Parameter VIL Low Level Input Voltage VIH High Level Input Voltage Test Condition Min. Max. 0.8 2.0 VILhyst Low Level Threshold Input Falling 0.8 VIHhyst High Level Threshold Input Rising 1.3 Vhyst Typ. Schmitt Trigger Hysteresis e t le c u d o r P 0.3 o s b O - Vol Low Level Output IoI = 100uA Voh High Level Output Ioh = -100uA Ioh = -2mA ) s ( ct ) s t( Unit V V 1.35 V 2.0 V 0.8 V 0.2 V VDD3-0.2 2.4 V V DC ELECTRICAL CHARACTERISTICS: 2.5V BUFFERS u d o Symbol VILst Parameter r P e Low Level Input Voltage t e l o VIHst Test Condition Schmitt input VILhyst Low Level Threshold non Schmitt, Input Falling VIHhyst High Level Threshold non Schmitt, Input Rising Vhyst Schmitt Trigger Hysteresis VOL Low Level Output Note 1 VOH High Level Output Note 1 Max. Unit 0.26*VDD V 0.7*VDD V 0.5*VDD 1.3 0.5*VDD V 2.0 0.23*VDD Notes: 1. Source/Sink current under worst-case conditions. 6/33 Typ. Schmitt input High Level Input Voltage s b O Min. V 0.15*VDD 0.85*VDD V V V STA308 1.0 PIN DESCRIPRTION 1.1 MVO: Master Volume Override This pin enables the user to bypass the Volume Control on all channels. When MVO is pulled High, the Master Volume Register is set to 00h, which corresponds to its Full Scale setting. The Master Volume Register Setting offsets the individual Channel Volume Settings, which default to 0dB. 1.2 SDI_12 through 78: Serial Data In Audio information enters the device here. Six format choices are available including I2S, left- or right-justified, LSB or MSB first, with word widths of 16, 18, 20 and 24 bits. 1.3 RESET Driving this pin (low) turns off the outputs and returns all settings to their defaults. 1.4 I2C The SA, SDA and SCL pins operate per the Philips I2C specification. See Section 2. c u d 1.5 PLL: Phase Locked Loop The phase locked loop section provides the System Timing Signals and CKOUT. 1.6 CKOUT: Clock Out e t le System synchronization and master clocks are provided by the CKOUT. 1.7 OUT1 through OUT8: PWM Outputs ) s t( o r P o s b O - The PWM outputs provide the input signal for the power devices. 1.8 EAPD: External Amplifier Power-Down ) s ( ct This signal can be used to control the power-down of DDX power devices. u d o 1.9 SDO_12 through 78: Serial Data Out Audio information exits the device here. Six different format choices are available including I2S, left- or rightjustified, LSB or MSB first, with word widths of 16, 18, 20 and 24 bits. r P e 1.10 PWDN: Device Power-Down t e l o This puts the STA308 into a low-power state via appropriate power-down sequence. Pulling PWDN low begins power-down sequence, and EAPD goes low ~30ms later. s b O 2.0 II2C BUS SPECIFICATION The STA308 supports the I2C protocol. This protocol defines any device that sends data on to the bus as a transmitter and any device that reads the data as a receiver. The device that controls the data transfer is known as the master and the other as the slave. The master always starts the transfer and provides the serial clock for synchronization. The STA308 is always a slave device in all of its communications. 7/33 STA308 2.1 COMMUNICATION PROTOCOL 2.1.1 Data Transition or change Data changes on the SDA line must only occur when the SCL clock is low. SDA transition while the clock is high is used to identify a START or STOP condition. 2.1.2 Start Condition START is identified by a high to low transition of the data bus SDA signal while the clock signal SCL is stable in the high state. A START condition must precede any command for data transfer. 2.1.3 Stop Condition STOP is identified by low to high transition of the data bus SDA signal while the clock signal SCL is stable in the high state. A STOP condition terminates communication between STA308 and the bus master. 2.1.4 Data Input During the data input the STA308 samples the SDA signal on the rising edge of clock SCL. For correct device operation the SDA signal must be stable during the rising edge of the clock and the data can change only when the SCL line is low. 2.2 DEVICE ADDRESSING c u d ) s t( To start communication between the master and the STA308, the master must initiate with a start condition. Following this, the master sends onto the SDA line 8-bits (MSB first) corresponding to the device select address and read or write mode. o r P The 7 most significant bits are the device address identifiers, corresponding to the I2C bus definition. In the STA308 the I2C interface has two device addresses depending on the SA pin configuration, 0x30 or 0011000x when SA = 0, and 0x32 or 0011001x when SA = 1. e t le o s b O - The 8th bit (LSB) identifies read or write operation RW, this bit is set to 1 in read mode and 0 for write mode. After a START condition the STA308 identifies on the bus the device address and if a match is found, it acknowledges the identification on SDA bus during the 9th bit time. The byte following the device identification byte is the internal space address. ) s ( ct 2.3 WRITE OPERATION Following the START condition the master sends a device select code with the RW bit set to 0. The STA308 acknowledges this and the writes for the byte of internal address. After receiving the internal byte address the STA308 again responds with an acknowledgement. u d o r P e 2.3.1 Byte Write In the byte write mode the master sends one data byte, this is acknowledged by the STA308. The master then terminates the transfer by generating a STOP condition. t e l o 2.3.2 Multi-byte Write s b O The multi-byte write modes can start from any internal address. The master generating a STOP condition terminates the transfer. 8/33 STA308 Write Mode Sequence ACK ACK DEV-ADDR BYTE WRITE ACK SUB-ADDR DATA IN RW START STOP ACK ACK DEV-ADDR MULTIBYTE WRITE ACK SUB-ADDR ACK DATA IN DATA IN RW START STOP Read Mode Sequence ACK CURRENT ADDRESS READ DEV-ADDR NO ACK DATA RW START STOP ACK RANDOM ADDRESS READ DEV-ADDR START SEQUENTIAL CURRENT READ ACK ACK SUB-ADDR RW RW= ACK HIGH DEV-ADDR NO ACK DEV-ADDR START DATA RW ACK STOP ACK DATA DATA NO ACK DATA ACK SEQUENTIAL RANDOM READ uc STOP START DEV-ADDR ACK ACK DEV-ADDR RW START ACK SUB-ADDR START DATA RW r P e t le Table 1. Register summary Address Name D7 D6 D5 D4 00h ConfA MPC HPE BME IR1 01h ConfB DRC ZCE SAIFB 02h ConfC HPB RES RES 03h ConfD BQL PSL 04h ConfE RES SAOFB 05h ConfF EAPD 06h Mmute 07h Mvol ct u d o r P e (s) COS1 SAO2 ACK DATA D3 od ) s t( NO ACK DATA STOP D2 D1 D0 IR0 MCS2 MCS1 MCS0 SAI1 SAI0 ZDE DSPB RES RES RES OM1 OM0 COS0 C78BO C56BO C34BO C12BO SAO1 SAO0 DEMP VOLEN MIXE AME COD I2SD PWMD b O - so SAI2 MMute MV7 MV6 MV5 MV4 MV3 MV2 MV1 MV0 Cmute C8M C7M C6M C5M C4M C3M C2M C1M C1Vol C1V7 C1V6 C1V5 C1V4 C1V3 C1V2 C1V1 C1V0 C2Vol C2V7 C2V6 C2V5 C2V4 C2V3 C2V2 C2V1 C2V0 0Bh C3Vol C3V7 C3V6 C3V5 C3V4 C3V3 C3V2 C3V1 C3V0 0Ch C4Vol C4V7 C4V6 C4V5 C4V4 C4V3 C4V2 C4V1 C4V0 0Dh C5Vol C5V7 C5V6 C5V5 C5V4 C5V3 C5V2 C5V1 C5V0 0Eh C6Vol C6V7 C6V6 C6V5 C6V4 C6V3 C6V2 C6V1 C6V0 0Fh C7Vol C7V7 C7V6 C7V5 C7V4 C7V3 C7V2 C7V1 C7V0 t e l o 08h 09h s b O 0Ah 9/33 STA308 10h C8Vol 11h C8V7 C8V6 C8V5 C8V4 C12im C2IM2 C2IM1 12h C34im C4IM2 13h C56im 14h C78im 15h C1234ls 16h C8V3 C8V2 C8V1 C8V0 C2IM0 C1IM2 C1IM1 C1IM0 C4IM1 C4IM0 C3IM2 C3IM1 C3IM0 C6IM2 C6IM1 C6IM0 C5IM2 C5IM1 C5IM0 C8IM2 C8IM1 C8IM0 C7IM2 C7IM1 C7IM0 C4LS1 C4LS0 C3LS1 C3LS0 C2LS1 C2LS0 C1LS1 C1LS0 C5678ls C8LS1 C8LS0 C7LS1 C7LS0 C6LS1 C6LS0 C5LS1 C5LS0 17h L1ar L1R3 L1R2 L1R1 L1R0 L1A3 L1A2 L1A1 L1A0 18h L1atrt L1AT3 L1AT2 L1AT1 L1AT0 L1RT3 L1RT2 L1RT1 L1RT0 19h L2ar L2R3 L2R2 L2R1 L2R0 L2A3 L2A2 L2A1 L2A0 1Ah L2atrt L2AT3 L2AT2 L2AT1 L2AT0 L2RT3 L2RT2 L2RT1 L2RT0 1Bh Tone TTC3 TTC2 TTC1 TTC0 BTC3 BTC2 BTC1 1Ch Cfaddr CFA7 CFA6 CFA5 CFA4 CFA3 CFA2 CFA1 1Dh B2cf1 C1B23 C1B22 C1B21 C1B20 C1B19 C1B18 1Eh B2cf2 C1B15 C1B14 C1B13 C1B12 C1B11 C1B10 1Fh B2cf3 C1B7 C1B6 C1B5 C1B4 C1B3 20h B0cf1 C2B23 C2B22 C2B21 C2B20 21h B0cf2 C2B15 C2B14 C2B13 C2B12 22h B0cf3 C2B7 C2B6 C2B5 23h A2cf1 C3B23 C3B22 C3B21 24h A2cf2 C3B15 C3B14 25h A2cf3 C3B7 C3B6 26h A1cf1 C4B23 27h A1cf2 28h uc od ) s t( BTC0 CFA0 C1B17 C1B16 C1B9 C1B8 C1B2 C1B1 C1B0 C2B19 C2B18 C2B17 C2B16 C2B11 C2B10 C2B9 C2B8 C2B3 C2B2 C2B1 C2B0 C3B20 C3B19 C3B18 C3B17 C3B16 C3B12 C3B11 C3B10 C3B9 C3B8 C3B5 C3B4 C3B3 C3B2 C3B1 C3B0 C4B22 C4B21 C4B20 C4B19 C4B18 C4B17 C4B16 C4B15 C4B14 C4B13 C4B12 C4B11 C4B10 C4B9 C4B8 A1cf3 C4B7 C4B6 C4B5 C4B4 C4B3 C4B2 C4B1 C4B0 B1cf1 C5B23 C5B22 C5B21 C5B20 C5B19 C5B18 C5B17 C5B16 bs B1cf2 C5B15 C5B14 C5B13 C5B12 C5B11 C5B10 C5B9 C5B8 2Bh B1cf3 C5B7 C5B6 C5B5 C5B4 C5B3 C5B2 C5B1 C5B0 2Ch Cfud WA W1 2Dh DC1 RES RES RES RES RES RES RES RES 2Eh DC2 RES RES RES RES RES RES RES RES 2Fh BIST1 RES RES RES RES RES RES RES RES 30h BIST2 RES RES RES RES RES 2Ah O 10/33 od r P e t e l o 29h uc (t s) C3B13 so b O C2B4 e t le Pr STA308 3.0 CONFIGURATION REGISTER A (ADDRESS 00H) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME MPC HPE BME IR1 IR0 MCS2 MCS1 MCS0 RST 1 0 0 0 0 0 1 1 3.0.1 Master Clock Select BIT R/W RST NAME DESCRIPTION 0 R/W 1 MCS0 1 R/W 1 MCS1 Master Clock Select : Selects the ratio between the input I2S sample frequency and the input clock. 2 R/W 0 MCS2 The STA308 will support sample rates of 32kHz, 44.1kHz, 48Khz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz. Therefore the internal clock will be: – 65.536Mhz for 32kHz – 90.3168Mhz for 44.1khz, 88.2kHz, and 176.4kHz – 98.304Mhz for 48kHz, 96kHz, and 192kHz c u d ) s t( The external clock frequency provided to the XTI pin must be a multiple of the input sample frequency(fs). The relationship between the input clock and the input sample rate is determined by both the MCSx and the IRx (Input Rate) register bits. The MCSx bits determine the PLL factor generating the internal clock and the IRx bits determine the oversampling ratio used internally. Input Sample Rate fs (kHz) IR 1xx 32, 44.1, 48 00 128fs 88.2, 96 01 64fs 176.4, 192 10 64fs ) s ( ct 3.0.2 Interpolation Ratio Select BIT R/W RST NAME 3 R/W 0 IR0 4 R/W 0 IR1 o r P MCS(2..0) e t le 011 010 001 000 384fs 512fs 768fs b O - 128fs 192fs 256fs 384fs 128fs 192fs 256fs 384fs so 256fs DESCRIPTION u d o Interpolation Ratio Select : Selects internal interpolation ratio based on input I2S sample frequency r P e The STA308 has variable interpolation (oversampling) settings such that internal processing and DDX output rates remain consistent. The first processing block interpolates by either 4 times, 2 times, or 1 time (passthrough). The IR bits determine the oversampling ratio of this interpolation. t e l o Table 2. IR bit settings as a function of Input Sample Rate. s b O Input Sample Rate Fs IR(1,0) 1st Stage Interpolation Ratio 32kHz 00 4 times oversampling 44.1kHz 00 4 times oversampling 48kHz 00 4 times oversampling 88.2kHz 01 2 times oversampling 96kHz 01 2 times oversampling 176.4kHz 10 Pass-Through 192kHz 10 Pass-Through 11/33 STA308 3.0.3 Bass Management Enable BIT R/W RST NAME 5 R/W 0 BME DESCRIPTION Bass Management Enable : 0 – No Bass Management 1 – Bass Management operation on channel 6, scale and add inputs Channel 6 of the STA308 features a bass management mode that enables redirection of information in all other channels to this channel and which can then be filtered appropriately using the EQ(Biquad) section. Setting the BME bit selects the output of the scale and mix block for channel 6 instead of the output of the channel mapping block. The settings for the scale and mix block are provided by the CxBMS registers 3.0.4 DDX Headphone Output Enable BIT R/W RST NAME 6 R/W 0 HPE DESCRIPTION DDX Headphone Enable : 0 – Channels 7,8 normal DDX operation. 1 – Channels 7,8 DDX Headphone operation. Channels 7 and 8 of the STA308 have the option to be processed for headphones. The headphone output can then be driven using an appropriate output device. This signal is a fully differential 3-wire drive called DDX Headphone c u d 3.0.5 Max Power Correction BIT R/W RST NAME 7 R/W 1 MPC DESCRIPTION ) s t( o r P Max Power Correction : Setting of 1 enables DDX correction for THD reduction near maximum power output. e t le Setting the MPC bit turns on special processing that corrects the DDX power device at high power. This mode should lower the THD+N of a full DDX system at maximum power output and slightly below. This mode will only be operational in OM= 00 or 10. 3.1 Configuration Register B (address 01h) BIT D7 D6 NAME DRC ZCE RST 0 o r P e 3.1.1 DSP Bypass BIT R/W 0 t e l o s b O R/W D4 D3 D2 D1 D0 SAIFB SAI2 SAI1 SAI0 ZDE DSPB 0 0 0 0 1 0 ct du 1 (s) D5 o s b O - RST NAME 0 DSPB DESCRIPTION DSP Bypass Bit : 0 – Normal Operation 1 – Bypass of Biquad and Bass/Treble Functionality Setting the DSPB bit bypasses the biquad and bass/treble functionality of the STA308. 3.1.2 Zero-Detect Mute Enable BIT R/W RST NAME 1 R/W 1 ZDE DESCRIPTION Zero-Detect Mute Enable : Setting of 1 enables the automatic zero-detect mute Setting the ZDE bit enables the zero-detect automatic mute. The zero-detect circuit looks at the input data to each processing channel after the channel mapping block. If any channel receives 2048 consecutive zero value samples (regardless of fs) then that individual channel is muted if this function is enabled. 12/33 STA308 Serial Audio Input Interface Format BIT R/W RST NAME 2 R/W 0 SAI0 3 R/W 0 SAI1 4 R/W 0 SAI2 DESCRIPTION Serial Audio Input Interface Format : Determines the interface format of the input serial digital audio interface. The STA308 features a configurable digital serial audio interface. The settings of the SAIx bits determine how the input to this interface is interpreted. Six formats are accepted. Table 3. Interface format as a function of SAI bits. SAI(2..0) Interface Format 000 I2S 001 Left-Justified Data 010 Right-Justified 16-bit Data 011 Right-Justified 18-bit Data 100 Right-Justified 20-bit Data 101 Right-Justified 24-bit Data c u d e t le Figure 2. Serial Audio Signals 2 SAI=000 I S Left LRCLK ) s ( ct SCLK MSB SDATA r P e SAI=001 Left Justified LRCLK t e l o SCLK s b O SDATA u d o o s b O - LSB MSB o r P Right MSB Left ) s t( LSB MSB Right LSB MSB LSB MSB SAI=010 to 101 Right Justified Left LRCLK Right SCLK SDATA MSB LSB MSB LSB MSB 13/33 STA308 3.1.3 Serial Audio Input Interface First Bit BIT R/W RST NAME DESCRIPTION 5 R/W 0 SAIFB Determines MSB or LSB first for all SAI formats 0 – MSB First, 1 – LSB First 3.1.4 Zero-Crossing Volume Enable BIT R/W RST NAME 6 R/W 1 ZCE DESCRIPTION Zero-Crossing Volume Enable : 1 – Volume adjustments will only occur at digital zero-crossings 0 – Volume adjustments will occur immediately The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital zero-crossings, "zipper noise" is eliminated 3.1.5 Dynamic Range Compression/Anti-Clipping Bit BIT R/W RST NAME 7 R/W 0 DRC DESCRIPTION Dynamic Range Compression/Anti-Clipping 0 – Limiters act in Anti-Clipping Mode 1- Limiters act in Dynamic Range Compression Mode c u d ) s t( Both limiters can be used in one of two ways, anti-clipping or dynamic range compression. When used in anticlipping mode the limiter threshold values are constant and dependent on the gain/attenuation settings applied to the input signal. In dynamic range compression mode the limiter threshold values vary with the volume settings allowing for limiting to occur independently of the gain/attenuation but dependent on the input signal 3.2 Configuration Register C (address 02h) BIT D7 D6 D5 NAME HPB RES RES RST 0 1 ) s ( ct 1 3.2.1 DDX Power Output Mode BIT R/W 0 R/W 1 R/W RST du NAME o r P e 0 OM0 0 OM1 e t le o s b O - o r P D4 D3 D2 D1 D0 RES RES RES OM1 OM0 1 1 1 0 0 DESCRIPTION DDX Power Output Mode : Selects configuration of DDX output. t e l o The DDX Power Output Mode selects how the DDX output timing is configured. Different power devices use different output modes. The DDX recommended use is OM = 00. The variable mode uses the OMVx bits for adjustment s b O OM(1,0) 14/33 Output Stage - Mode 00 Fixed Compensation 01 RESERVED 10 Full Power Moderecomanded for STA500 and STA505 11 RESERVED STA308 3.2.2 High-Pass Filter Bypass BIT R/W RST NAME DESCRIPTION 7 R/W 0 HPB High-Pass Filter Bypass Bit. Setting of one bypasses internal AC coupling digital high-pass filter The STA308 features an internal digital high-pass filter for the purpose of AC coupling. The purpose of this filter is to prevent DC signals from passing through a DDX amplifier. DC signals can cause speaker damage 3.3 Configuration Register D (address 03h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME BQL PSL COS1 COS0 C78BO C56BO C34BO C12BO RST 0 0 1 0 0 0 0 0 3.3.1 Binary Output Enable Registers ) s t( BIT R/W RST NAME DESCRIPTION 0 R/W 0 C12BO 1 R/W 0 C34BO Channels 1&2, 3&4, 5&6, 7&8 Binary Output Mode Enable Bits. A setting of 0 indicates ordinary DDX tri-state output. A setting of 1 indicates binary output mode. 2 R/W 0 C56BO 3 R/W 0 C78BO c u d o r P Each two-channel pair of outputs can be set to output a binary PWM stream. In this mode, output A e t le of a channel will be considered the positive output and output B is negative inverse. For example, setting C34BO = 1 sets channels 3&4 to Binary Output (PWM) Mode. 3.3.2 Clock Output Select BIT R/W RST 4 R/W 0 5 R/W ) s ( ct 1 o s b O NAME DESCRIPTION COS0 Clock Output Select COS1 Clock Output Select The Clock Output Select register selects the frequency of the clock output pin relative to the PLL clock output. The PLL clock runs at 2048fs for 32, 44.1, and 48kHz, at 1024fs for 88.2kHz and 96 kHz, and at 512fs for 176.4kHz and 192kHz. u d o r P e COS(1,0) CKOUT Frequency t e l o 01 s b O PLL Output/4 10 PLL Output/8 11 PLL Output/16 3.3.3 Post-Scale Link BIT R/W RST NAME 6 R/W 0 PSL DESCRIPTION Post-Scale Link :0 – Each Channel uses individual Post-Scale value 1 - Each Channel uses Channel 1 Post-Scale value For multi-channel applications, the post-scale values can be linked to the value of channel 1 for ease of use and update the values faster. 15/33 STA308 3.3.4 Biquad Coefficient Link BIT R/W RST NAME 7 R/W 0 BQL DESCRIPTION Biquad Link : 0 – Each Channel uses coefficient values 1- Each Channel uses Channel 1 coefficient values For ease of use, all channels can use the biquad coefficients loaded into the Channel 1 Coefficient RAM space by setting the BQL bit to 1. Then any EQ updates would only have to be performed once. 3.4 Configuration Register E (address 04h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME RES SAOFB SAO2 SAO1 SAO0 DEMP VOLEN MIXE RST 0 0 0 0 0 0 1 0 BIT R/W RST NAME 0 R/W 0 MIXE c u d DESCRIPTION o r P Mix Enable: 0 – Normal Operation 1 - Adjacent Channel Mix Mode e t le ) s t( The scale and mix functionality can be used to mix adjacent channels instead of for bass management. By setting this bit(BME must be set to 0) odd channels will be mixed with their adjacent even channel and output in the place of the even channel. The odd channel wills pass-through unscaled. The values used for this function are the same as for bass management. Since this function occurs post channel mapping a large number of possibilities are present for two channel mixing. Up to four mixed channels can be obtained. BIT R/W RST NAME 1 R/W 1 VOLEN o s b O - DESCRIPTION ) s ( ct Volume Enable: 0 – Volume Operation Bypassed 1 - Volume Operation Normal When VOLEN set to 1, volume operation is normal. When set to 0, volume operation is bypassed and the volume stages are all set to pass-through. This also eliminates the digital volume offset of ~-0.6dB that is used to map full-scale digital input to full DDX modulation output. BIT r P e R/W t e l o 2 R/W u d o RST NAME 0 DEMP DESCRIPTION Deemphasis : 0 – No Deemphasis, 1- Deemphasis By setting this bit to one deemphasis will implemented on all channels. When this is used it takes the place of biquad #1 in each channel and any coefficients using biquad #1 will be ignored. DSPB(DSP Bypass) bit must s b O be set to 0 for Deemphasis to function. BIT R/W RST NAME 3 R/W 0 SAO0 4 R/W 0 SAO1 5 R/W 0 SAO2 DESCRIPTION Serial Audio Output Interface Format : Determines the interface format of the output serial digital audio interface. The STA308 features a configurable digital serial audio interface. The settings of the SAIx bits determine how the output to this interface is interpreted. Six formats are accepted. 16/33 STA308 Table 4. Interface format as a function of SAO bits. SAO(2..0) Interface Format 000 I2S 001 Left-Justified Data 010 Right-Justified 16-bit Data 011 Right-Justified 18-bit Data 100 Right-Justified 20-bit Data 101 Right-Justified 24-bit Data BIT R/W RST NAME 6 R/W 0 SAOFB DESCRIPTION Determines MSB or LSB first for all SAO formats; 0 – MSB First 1 – LSB First D1 ) s t( SID PWMD 0 0 3.5 Configuration Register F (address 05h) BIT D7 NAME RST D6 D3 D2 EAPD AME COD 0 0 0 BIT R/W RST NAME 0 R/W 0 PWMD 1 R/W 0 SID 2 R/W 0 COD 3 R/W 0 AME o r P e D5 D4 r P e t le uc od D0 DESCRIPTION o s b O - PWM Output Disable: 0 – PWM Output Normal 1- No PWM Output Serial Interface(I2S Out) Disable: 0 – I2S Output Normal 1- No I2S Output du ) s ( ct Clock Output Disable: 0 – Clock Output Normal 1- No Clock Output AM Mode Enable : 0 – Normal DDX operation. 1 – AM reduction mode DDX operation. The STA308 features a DDX processing mode that minimizes the amount of noise generated in frequency range of AM radio. This mode is intended to be used when DDX is operating in a device with an AM tuner active. The SNR of the DDX processing is reduced to ~83dB in this mode, which is still greater than the SNR of AM radio. BIT t e l o R/W bs 7 R/W RST NAME 0 EAPD O DESCRIPTION External Amplifier Power Down: 0 – External Power Stage Power Down Active 1 - Normal Operation This output bit, on pin 51 of the device, is used to mute the DDX Power Devices for Power-Down. 3.6 Master Mute Register (address 06h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME MMUTE RST 0 17/33 STA308 3.7 Master Volume Register (address 07h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME MV7 MV6 MV5 MV4 MV3 MV2 MV1 MV0 RST 1 1 1 1 1 1 1 1 3.8 Channels 1,2,3,4,5,6,7,8 Mute (address 08h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C8M C7M C6M C5M C4M C3M C2M C1M RST 0 0 0 0 0 0 0 0 D0 3.9 Channel 1 Volume (address 09h) BIT D7 D6 D5 D4 D3 D2 D1 NAME C1V7 C1V6 C1V5 C1V4 C1V3 C1V2 C1V1 RST 0 0 1 1 0 0 0 P e let D7 D6 D5 D4 D3 D2 NAME C2V7 C2V6 C2V5 C2V4 C2V3 RST 0 0 1 1 3.11 Channel 3 Volume (address 0Bh) BIT NAME RST D7 D6 C3V7 C3V6 0 0 ) s ( ct u d o r P e D5 C3V5 1 D4 0 D1 D0 C2V2 C2V1 C2V0 0 0 0 0 D3 D2 D1 D0 so b O - uc d o r 3.10 Channel 2 Volume (address 0Ah) BIT ) s t( C1V0 C3V4 C3V3 C3V2 C3V1 C3V0 1 0 0 0 0 3.12 Channel 4 Volume (address 0Ch) BIT t e l o NAME RST s b O D7 D6 D5 D4 D3 D2 D1 D0 C4V7 C4V6 C4V5 C4V4 C4V3 C4V2 C4V1 C4V0 0 0 1 1 0 0 0 0 3.13 Channel 5 Volume (address 0Dh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C5V7 C5V6 C5V5 C5V4 C5V3 C5V2 C5V1 C5V0 RST 0 0 1 1 0 0 0 0 18/33 STA308 3.14 Channel 6 Volume (address 0Eh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C6V7 C6V6 C6V5 C6V4 C6V3 C6V2 C6V1 C6V0 RST 0 0 1 1 0 0 0 0 3.15 Channel 7 Volume (address 0Fh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C7V7 C7V6 C7V5 C7V4 C7V3 C7V2 C7V1 C7V0 RST 0 0 1 1 0 0 0 0 D0 3.16 Channel 8 Volume (address 10h) BIT D7 D6 D5 D4 D3 D2 D1 NAME C8V7 C8V6 C8V5 C8V4 C8V3 C8V2 C8V1 RST 0 0 1 1 0 0 0 uc ) s t( C8V0 0 d o r The Volume structure of the STA308 consists of individual volume registers for each channel and a master volume register that provides an offset to each channels volume setting. The individual channel volumes are adjustable in 0.5dB steps from +24dB to -103dB. As an example if C5V = 0Bh or +18.5dB and MV = 21h or 16.5dB, then the total gain for channel 5 = +2dB. The Master Mute when set to 1 will mute all channels at once, whereas the individual channel mutes(CxM) will mute only that channel. Both the Master Mute and the Channel Mutes provide a "soft mute" with the volume ramping down to mute in 8192 samples from the maximum volume setting at the internal processing rate(~192kHz). A "hard mute" can be obtained by commanding a value of all 1's(255) to any channel volume register or the master volume register. When volume offsets are provided via the master volume register any channel that whose total volume is less than -103dB will be muted. All changes in volume take place at zero-crossings when ZCE = 1(configuration register B) on a per channel basis as this creates the smoothest possible volume transitions. When ZCE=0, volume updates will occur immediately. P e let ) s ( ct o s b O - Table 5. Master Volume Offset as a function of MV(7..0). MV(7..0) o r P e 00000000(00h) 00000001(01h) t e l o O bs du Volume Offset from Channel Value 0dB -0.5dB 00000010(02h) -1dB … … 01001100(4Ch) -38dB … … 11111110(FEh) -127dB 11111111(FFh) Hard Master Mute 19/33 STA308 Channel Volume as a function of CxV(7..0) CxV(7..0) Volume 00000000(00h) +24dB 00000001(01h) +23.5dB 00000010(02h) +23dB … … 00101111(2Fh) +0.5dB 00110000(30h) 0dB 00110001(31h) -0.5dB … … 11111110(FEh) -103dB 11111111(FFh) Hard Channel Mute 3.17 Channel Input Mapping Channels 1 & 2 (address 11h) BIT D7 D6 D5 D4 NAME C2IM2 C2IM1 RST 0 0 D3 D2 D1 C2IM0 C1IM2 C1IM1 1 0 BIT D7 D6 D5 D4 NAME C4IM2 C4IM1 C4IM0 RST 0 1 ) s ( ct D3 so b O 1 od D0 C1IM0 0 0 D2 D1 D0 C3IM2 C3IM1 C3IM0 0 1 0 D2 D1 D0 r P e t le 3.18 Channel Input Mapping Channels 3 & 4 (address 12h) uc ) s t( 3.19 Channel Input Mapping Channels 5 & 6 (address 13h) BIT D7 NAME D6 du C6IM2 o r P e RST 1 D5 D4 D3 C6IM1 C6IM0 C5IM2 C5IM1 C5IM0 0 1 1 0 0 D2 D1 D0 3.20 Channel Input Mapping Channels 7 & 8 (address 14h) t e l o BIT D6 D5 D4 NAME C8IM2 C8IM1 C8IM0 C7IM2 C7IM1 C7IM0 RST 1 1 1 1 1 0 s b O D7 D3 Each channel received via I2S can be mapped to any internal processing channel via the Channel Input Mapping registers. This allows for flexibility in processing, simplifies output stage designs, and enables the ability to perform crossovers. The default settings of these registers map each I2S input channel to its corresponding processing channel. For example, to map input 2 to Channel 5, set Address 11h, bits D6, D5 and D4 to 100. Now, inputs 2 and 5 go to Channel 5. 20/33 STA308 Table 6. Channel Mapping as a function of CxIM bits CxIM(2..0) I2S Input Mapped to: 000 Channel 1 001 Channel 2 010 Channel 3 011 Channel 4 100 Channel 5 101 Channel 6 110 Channel 7 111 Channel 8 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 8:1 Mux Channel X 3 CxIM(2..0) STA308 Output Phasing CH1 CH2 c u d CH3 CH4 e t le CH5 CH6 ) s ( ct CH7 u d o CH8 r P e t e l o ) s t( o r P o s b O - 1/384kHz or 2.874us 3.21 Channel Limiter Select Channels 1,2,3,4 (address 15h) s b O BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C4LS1 C4LS0 C3LS1 C3LS0 C2LS1 C2LS0 C1LS1 C1LS0 RST 0 0 0 0 0 0 0 0 3.22 Channel Limiter Select Channels 5,6,7,8 (address 16h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C8LS1 C8LS0 C7LS1 C7LS0 C6LS1 C6LS0 C5LS1 C5LS0 RST 0 0 0 0 0 0 0 0 21/33 STA308 3.23 Limiter 1 Attack/Release Rate (address 17h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME L1R3 L1R2 L1R1 L1R0 L1A3 L1A2 L1A1 L1A0 RST 1 0 1 0 0 1 1 0 3.24 Limiter 1 Attack/Release Threshold (address 18h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME L1AT3 L1AT2 L1AT1 L1AT0 L1RT3 L1RT2 L1RT1 L1RT0 RST 0 1 1 0 0 1 1 1 D0 3.25 Limiter 2 Attack/Release Rate (address 19h) BIT D7 D6 D5 D4 D3 D2 D1 NAME L2R3 L2R2 L2R1 L2R0 L2A3 L2A2 L2A1 RST 1 0 1 0 0 1 1 d o r 3.26 Limiter 2 Attack/Release Threshold (address 1Ah) P e let BIT D7 D6 D5 D4 D3 D2 NAME L2AT3 L2AT2 L2AT1 L2AT0 L2RT3 RST 0 1 1 0 Basic Limiter and Volume Flow Diagram. ) s ( ct Gain/Volume 0 0 D1 D0 L2RT2 L2RT1 L2RT0 1 1 1 b O Limiter RMS Attenuation Saturation u d o r P e t e l o Input so uc ) s t( L2A0 Gain Output s b O A limiter is basically a variable gain device, where the amount of gain applied depends on the input signal level. As the name implies, compression limits the dynamic range of the signal. The STA308 includes 2 independent limiter blocks. The purpose of the limiters is to automatically reduce the dynamic range of the input signal to prevent the outputs from clipping in anti-clipping mode or to actively reduce the dynamic range for a better listening environment such as a night-time listening mode which is often needed for DVDs. The two modes are selected via the DRC bit in Configuration Register B; address 0x02, bit 7. Each channel can be mapped to either limiter or not mapped. Non-mapped channels will clip when 0dBFS is exceeded. Each limiter will look at the present value of each channel that is mapped to it, select the maximum 22/33 STA308 absolute value of all these channels, perform the limiting algorithm on that value, and then, if needed, adjust the gain of the mapped channels in unison. The limiter attack thresholds are determined by the LxAT registers. It is recommended in anti-clipping mode to set this to 0dBFS, which corresponds to the maximum unclipped output power of a DDX amplifier. Since gain can be added digitally within the STA308 it is possible to exceed 0dBFS or any other LxAT setting. When this occurs, the limiter, when active, will automatically start reducing the gain. The rate at which the gain is reduced when the attack threshold is exceeded is dependent upon the attack rate register setting for that limiter. The gain reduction occurs on a peak-detect algorithm. The release of limiter (uncompression), when the gain is again increased, is dependent on a RMS-detect algorithm. The output of the volume/limiter block is passed through a RMS filter. The output of this filter is compared to the release threshold, determined by the Release Threshold register. When the RMS filter output falls below the release threshold, the gain is again increased (uncompressed) at a rate dependent upon the Release Rate register. The gain can never be increased past its set value and therefore the release will only occur if the limiter has already reduced the gain. The release threshold value can be used to set what is effectively a minimum dynamic range, this is helpful as over-limiting can reduce the dynamic range to virtually zero and cause program material to sound "lifeless". In AC mode the attack and release thresholds are set relative to full-scale. In DRC mode the attack threshold is set relative to the maximum volume setting of the channels mapped to that limiter and the release threshold is set relative to the maximum volume setting plus the attack threshold. c u d Table 7. Channel Limiter Mapping as a function of CxLS bits. CxLS(1,0) ) s t( o r P Channel Limiter Mapping 00 Channel has limiting disabled 01 Channel is mapped to limiter #1 10 Channel is mapped to limiter #2 e t le o s b O - Table 8. Limiter Attack Rate as a function of LxA bits. LxA(3..0) Attack Rate dB/ms ) s ( ct 0001 0010 u d o 0011 LxA(3..0) r P e 0110 0.4512 0111 0.2256 1000 0.1504 1001 0.1123 1010 0.0902 1011 0.0752 1100 0.0645 1101 0.0564 1110 0.0501 1111 0.0451 0000 t e l o s b O 1.3536 0.9024 note: Shaded areas are Default Settings 23/33 STA308 Table 9. Limiter Release Rate and Uncompression Threshold as a function of LxR bits LxR(3..0) Release Rate dB/ms 0000 0.5116 0001 0.1370 0010 0.0744 0011 0.0499 0100 0.0360 0101 0.0299 0110 0.0264 0111 0.0208 1000 0.0198 1001 0.0172 1010 0.0147 1011 0.0137 1100 0.0134 1101 0.0117 1110 0.0110 e t le 1111 0.0104 o s b O - c u d ) s t( o r P Table 10. Limiter Attack Threshold as a function of LxAT bits. LxAT(3..0) AC(dB relative to FS) DRC(db relative to Volume) 0000 -12 -22 0001 -10 0010 0011 o r P e 0100 0101 -8 -18 -6 -16 -4 -14 -2 -12 0 -10 +2 -8 1000 +3 -7 1001 +4 -6 1010 +5 -5 1011 +6 -4 1100 +7 -3 1101 +8 -2 1110 +9 -1 1111 +10 0 0111 bs 24/33 -20 t e l o 0110 O c u d (t s) STA308 Table 11. Limiter Release Threshold as a function of LxRT bits LxRT(3..0) AC(dB relative to FS) DRC(db relative to Volume + LxAT) 0000 • • 0001 -23dB -33dB 0010 -16.9dB -26.9dB 0011 -13.4dB -23.4dB 0100 -10.9dB -20.9dB 0101 -9.0dB -19.0dB 0110 -7.4dB -17.4dB 0111 -6.0dB -16.0dB 1000 -4.9dB -14.9dB 1001 -3.8dB -13.8dB 1010 -2.9dB -12.9dB 1011 -2.1dB -12.1dB 1100 -1.3dB -11.3dB 1101 -0.65dB -10.65dB 1110 0dB -10dB 1111 +0.6dB -9.4dBdB e t le 3.27 Bass and Treble Tone Control(address 1Bh) BIT D7 D6 D5 D4 NAME TTC3 TTC2 TTC1 TTC0 RST 0 1 1 o r P D3 D2 D1 D0 BTC3 BTC2 BTC1 BTC0 0 1 1 1 so b O 1 c u d ) s t( The STA308 contains bass and treble tone control adjustments. These are selectable from +12dB to -12dB of boost or cut. These are 1st order shelving filters with a corner frequency of 150Hz for bass and 3kHz for treble. Any gain introduced in the tone controls will carry through to the volume and limiting block without saturation. ) s ( ct BTC(3..0)/TTC(3..0) u d o Boost/Cut 0000 -12dB 0001 -12dB … … 0111 -4dB 0110 -2dB 0111 0dB 1000 +2dB 1001 +4dB … … 1101 +12dB 1110 +12dB 1111 +12dB Table 12. Tone Control Boost/Cut as a function of BTC and TTC bits r P e s b O t e l o 25/33 STA308 3.28 Coefficient Address Register (address 1Ch) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME CFA7 CFA6 CFA5 CFA4 CFA3 CFA2 CFA1 CFA0 RST 0 0 0 0 0 0 0 0 3.29 Coefficient b2 Data Register Bits 23..16 (address 1Dh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C1B23 C1B22 C1B21 C1B20 C1B19 C1B18 C1B17 C1B16 RST 0 0 0 0 0 0 0 0 3.30 Coefficient b2 Data Register Bits 15..8 (address 1Eh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C1B15 C1B14 C1B13 C1B12 C1B11 C1B10 C1B9 C1B8 RST 0 0 0 0 0 0 0 c u d 3.31 Coefficient b2 Data Register Bits 7..0 (address 1Fh) BIT D7 D6 D5 D4 D3 D2 NAME C1B7 C1B6 C1B5 C1B4 C1B3 C1B2 RST 0 0 0 0 0 3.32 Coefficient b0 Data Register Bits 23..16 (address 20h) BIT D7 D6 D5 NAME C2B23 C2B22 C2B21 RST 0 0 0 ) s ( ct D4 D1 D0 C1B1 C1B0 0 0 0 D3 D2 D1 D0 C2B19 C2B18 C2B17 C2B16 0 0 0 0 e t le so b O C2B20 0 ) s t( 0 o r P 3.33 Coefficient b0 Data Register Bits 15..8 (address 21h) BIT D7 NAME C2B15 u d o r P e RST 0 t e l o D6 C2B14 0 D5 D4 D3 D2 D1 D0 C2B13 C2B12 C2B11 C2B10 C2B9 C2B8 0 0 0 0 0 0 3.34 Coefficient b0 Data Register Bits 7..0 (address 22h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C2B7 C2B6 C2B5 C2B4 C2B3 C2B2 C2B1 C2B0 RST 0 0 0 0 0 0 0 0 bs O 3.35 Coefficient a2 Data Register Bits 23..16 (address 23h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C3B23 C3B22 C3B21 C3B20 C3B19 C3B18 C3B17 C3B16 RST 0 0 0 0 0 0 0 0 26/33 STA308 3.36 Coefficient a2 Data Register Bits 15..8 (address 24h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C3B15 C3B14 C3B13 C3B12 C3B11 C3B10 C3B9 C3B8 RST 0 0 0 0 0 0 0 0 3.37 Coefficient a2 Data Register Bits 7..0 (address 25h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C3B7 C3B6 C3B5 C3B4 C3B3 C3B2 C3B1 C3B0 RST 0 0 0 0 0 0 0 0 3.38 Coefficient a1 Data Register Bits 23..16 (address 26h) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C4B23 C4B22 C4B21 C4B20 C4B19 C4B18 C4B17 C4B16 RST 0 0 0 0 0 0 0 c u d 3.39 Coefficient a1 Data Register Bits 15..8 (address 27h) BIT D7 D6 D5 D4 D3 D2 NAME C4B15 C4B14 C4B13 C4B12 C4B11 C4B10 RST 0 0 0 0 0 3.40 Coefficient a1 Data Register Bits 7..0 (address 28h) BIT D7 D6 D5 NAME C4B7 C4B6 C4B5 RST 0 0 0 ) s ( ct D4 D1 D0 C4B9 C4B8 0 0 0 D3 D2 D1 D0 C4B3 C4B2 C4B1 C4B0 0 0 0 0 e t le so b O C4B4 0 ) s t( 0 o r P 3.41 Coefficient b1 Data Register Bits 23..16 (address 29h) BIT D7 NAME C5B23 u d o r P e RST 0 t e l o D6 C5B22 0 D5 D4 D3 D2 D1 D0 C5B21 C5B20 C5B19 C5B18 C5B17 C5B16 0 0 0 0 0 0 3.42 Coefficient b1 Data Register Bits 15..8 (address 2Ah) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C5B15 C5B14 C5B13 C5B12 C5B11 C5B10 C5B9 C5B8 RST 0 0 0 0 0 0 0 0 bs O 3.43 Coefficient b1 Data Register Bits 7..0 (address 2Bh) BIT D7 D6 D5 D4 D3 D2 D1 D0 NAME C5B7 C5B6 C5B5 C5B4 C5B3 C5B2 C5B1 C5B0 RST 0 0 0 0 0 0 0 0 27/33 STA308 3.44 Coefficient Write Control Register (address 2Ch) BIT D7 D6 D5 D4 D3 D2 NAME D1 D0 WA W1 RST Coefficients for EQ and Bass Management are handled internally in the STA308 via RAM. Access to this RAM is available to the user via an I2C register interface. A collection of I2C registers is dedicated to this function. One contains a coefficient base address, five sets of three store the values of the 24-bit coefficients to be written or that were read, and one contains bits used to control the writing of the coefficient(s) to RAM. The following are step instructions for reading and writing coefficients. Reading a coefficient from RAM – write 8-bit address to I2C register 1Ch – ead top 8-bits of coefficient in I2C address 1Dh – ead middle 8-bits of coefficient in I2C address 1Eh – ead bottom 8-bits of coefficient in I2C address 1Fh c u d Writing a single coefficient to RAM – write 8-bit address to I2C register 1Ch – write top 8-bits of coefficient in I2C address 1Dh – write middle 8-bits of coefficient in I2C address 1Eh e t le – write bottom 8-bits of coefficient in I2C address 1Fh – write 1 to W1 bit in I2C address 2Bh ) s t( o r P o s b O - Writing a set of coefficients to RAM – write 8-bit starting address to I2C register 1Ch ) s ( ct – write top 8-bits of coefficient b2 in I2C address 1Dh – write middle 8-bits of coefficient b2 in I2C address 1Eh – write bottom 8-bits of coefficient b2 in I2C address 1Fh u d o – write top 8-bits of coefficient b0 in I2C address 20h r P e – write middle 8-bits of coefficient b0 in I2C address 21h – write bottom 8-bits of coefficient b0 in I2C address 22h t e l o – write top 8-bits of coefficient a2 in I2C address 23h – write middle 8-bits of coefficient a2 in I2C address 24h – write bottom 8-bits of coefficient a2 in I2C address 25h s b O – write top 8-bits of coefficient a1 in I2C address 26h – write middle 8-bits of coefficient a1 in I2C address 27h – write bottom 8-bits of coefficient a1 in I2C address 28h – write top 8-bits of coefficient b1 in I2C address 29h – write middle 8-bits of coefficient b1 in I2C address 2Ah – write bottom 8-bits of coefficient b1 in I2C address 2Bh – write 1 to WA bit in I2C address 2Ch The mechanism for writing a set of coefficients to RAM provides a method of updating the five coefficients cor- 28/33 STA308 responding to a given biquad (filter) simultaneously to avoid possible unpleasant acoustic side effects. When using this technique, the 8-bit address would specify the address of the biquad b2 coefficient (e.g. 0, 5, 10, 15, …, 50, … 195 decimal), and the STA308 will generate the RAM addresses as offsets from this base value to write the complete set of coefficient data. Equalization: Figure 3. Data Flow for single channel Biquad / Bass / Treble block.: From 1st Interpolation Stage PreScale To Volume/ Limiter Biquad1 Biquad2 Biquad3 Biquad4 Bass/ Treble Biquad5 ) s t( Five user-programmable 28-bit biquads are available per channel in the STA308. These biquads run at 192kHz for 48kHz, 96kHz, or 192kHz input and at 176.4kHz for 44.1kHz, 88.2kHz, and 176.4kHz input. The PreScale block is used for attenuation when filters are to be designed that boost frequencies above 0dBFS. This is a single 28-bit signed multiply, with 800000h = -1 and 7FFFFFh = 0.9999998808. These values are labeled CxPS, with x representing the channel. The biquads use this equation: c u d Y[n] = 2(b0/2)X[n] + 2(b1/2)X[n-1] + b2X[n-2] - 2(a1/2)Y[n-1] - a2Y[n-2] e t le = b0X[n] + b1X[n-1] + b2X[n-2] - a1Y[n-1] - a2Y[n-2] o r P o s b O - Y[n] represents the output and X[n] represents the input. Coefficients are defined in the following manner: CxHx0 = b2 ) s ( ct CxHx1 = b0/2 CxHx2 = -a2 u d o CxHx3 = -a1/2 CxHx4 = b1/2 r P e The first x represents the channel and the second the biquad number. For example C3H41 is the b0/2 coefficient in the fourth series biquad in channel 3. The biquad link bit allows all channels to use the coefficients of channel 1. t e l o s b O Bass Management Channel 6 provides the ability to scale and mix all channels before the biquad block. This allows for information from any channel to be redirected to this channel and then filtered appropriately for a subwoofer application. When the BME bit is set (bit D5 of Configuration Register A, at address 00h) the input to the biquad section is routed from the scale and mix block instead of the normal channel 6 1st stage interpolation output. Eight scaling coefficients are provided to perform this function. They are labeled CxBMS with x representing the channel that is being scaled. Each input channel is multiplied by its corresponding scale factor and summed. The output of the summation is the output of the scale and mix block. 29/33 STA308 Post-Scale The STA308 provides one additional multiplication after the last interpolation stage and before the distortion compensation on each channel. This is a 24-bit signed fractional multiply. The scale factor for this multiply is loaded into RAM using the same I2C registers as the biquad coefficients and the bass-management. All channels can use the channel 1 by setting the post-scale link bit. RAM Block for Biquads and Bass Management: Index (Decimal) Index (Hex) 0 00h 1 2 Coefficient Channel 1 - Biquad 1 Default C1H10(b2) 000000h 01h C1H11(b0/2) 3FFFFFh 02h C1H12(a2) 000000h 3 03h C1H13(a1/2) 000000h 4 04h C1H14(b1/2) 000000h 5 05h Channel 1 - Biquad 2 C1H20 000000h … … … … … 24 18h Channel 1 - Biquad 5 C1H54 25 19h Channel 2 - Biquad 1 C2H10 26 1Ah … … … … 45 2Dh … … 49 31h Channel 2 - Biquad 5 50 32h Channel 3 - Biquad 1 … … C2H11 e t le Distortion Compensation … … (s) b O - so c u d ) s t( 000000h 000000h o r P 3FFFFFh … DCC 23…0 000000h … … C2H54 000000h C3H10 000000h … … C8H54 000000h 199 C7h Channel 8 - Biquad 5 200 C8h Channel 1 - Pre-Scale C1PS 800000h 201 C9h Channel 2 – Pre-Scale C2PS 800000h 202 CAh Channel 3 – Pre-Scale C3PS 800000h … … … Channel 8 –Pre-Scale C8PS 800000h D0h Channel 1 – BassM Scale C1BMS 000000h D1h Channel 2 – BassM Scale C2BMS 000000h … … … … 207 CFh t e l o 208 209 u d o r P e … ct bs D7h Channel 8 – BassM Scale C8BMS 000000h 216 D8h Channel 1 – Post-Scale C1PS 800000h 217 D9h Channel 2 – Post-Scale C2PS 800000h … … … C8PS 800000h … … … O 215 … … … 223 DFh Channel 8 – Post-Scale 224 F0h Not Used … 255 30/33 … FFh … Not Used STA308 mm inch DIM. MIN. TYP. MAX. A MIN. TYP. 1.60 0.063 A1 0.05 A2 1.35 B 0.17 C 0.09 D 11.80 12.00 12.20 0.464 0.472 0.480 D1 9.80 10.00 10.20 0.386 0.394 0.401 0.15 0.002 1.40 1.45 0.053 0.22 0.27 0.006 0.055 0.057 0.0066 0.0086 0.0106 0.0035 D3 7.50 0.295 e 0.50 0.0197 E 11.80 12.00 12.20 0.464 0.472 0.480 E1 9.80 10.00 10.20 0.386 0.394 0.401 7.50 0.45 0.60 L1 0.75 0.0177 0.0236 0.0295 1.00 0.0393 e t le 0˚ (min.), 3.5˚ (min.), 7˚(max.) ccc 0.080 0.0031 D D1 ) s ( ct D3 o r P e du A1 32 0.08mm ccc Seating Plane E3 B A A2 33 t e l o 17 64 1 16 C e L L1 s b O o s b O - B 48 49 o r P TQFP64 (10 x 10 x 1.4mm) E1 K c u d 0.295 ) s t( E E3 L OUTLINE AND MECHANICAL DATA MAX. K TQFP64 0051434 E 31/33 STA308 4.0 REVISION HISTORY Table 13. Revision History Date Revision Description of Changes April 2004 2 Updates not recorded 30-Apr-2010 3 Removed "Preliminary data" status from cover page c u d e t le ) s ( ct u d o r P e t e l o s b O 32/33 o s b O - o r P ) s t( STA308 Please Read Carefully: c u d ) s t( Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. 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