April 12, 2012 Stereo Class D Spatial Array General Description Features The LM48903 is a stereo Class D amplifier that utilizes TI’s proprietary spatial sound processor to create an enhanced sound stage for portable multimedia devices. The Class D output stages feature National’s edge rate control (ERC) PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. The LM48903’s flexible I2S interface is compatible with standard serial audio interfaces. A stereo differential-input ADC gives the device the ability to process analog stereo audio signals. The LM48903 is configured through an I2C compatible interface and is capable of delivering 1.7W/channel of continuous output power into an 8Ω load with less than 10% THD+N. Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Click and pop suppression eliminates audible transients on powerup/down and during shutdown. The LM48903 is available in space saving micro SMD package. ■ ■ ■ ■ ■ ■ ■ ■ ■ Spatial Sound Processing I2S Input Stereo, Analog, Differential-Input ADC Edge Rate Control Short Circuit and Thermal Overload Protection Minimum external components Click and Pop suppression Micro-power shutdown Available in space-saving micro SMD package Applications ■ ■ ■ ■ ■ Smart Phones Portable Gaming Tablets Multimedia Devices MP3 Player Accessories Key Specifications ■ SNR (A-Weighted) 90dBA (typ) ■ Output Power/channel, PVDD = 5V RL = 8Ω, THD+N ≤ 1% ■ THD+N 1.3W (typ) 0.08% (typ) ■ Efficiency/Channel 91% (typ) ■ PSRR at 217Hz 69dB (typ) Boomer® is a registered trademark of National Semiconductor Corporation. © 2012 Texas Instruments Incorporated 301858 SNAS587 www.ti.com LM48903 Stereo Class D Spatial Array LM48903 LM48903 Typical Application 301858f7 FIGURE 1. Typical Audio Amplifier Application Circuit www.ti.com 2 LM48903 Connection Diagrams micro SMD Package 30–Bump micro SMD Marking 30185844 Top View XY = Date code TT = Die traceability G = Boomer Family K6 = LM48903TL 30185843 Top View Order NumberLM48903TL See NS Package Number TLA30HHA Ordering Information Ordering Information Table Order Number Package Package Drawing Number Transport Media MSL Level Green Status LM48903TL micro SMD TLA30HHA 250 and 2500 units on tape and reel 1 RoHS & no Sb/Br 3 www.ti.com LM48903 TABLE 1. Bump Description www.ti.com BUMP NAME DESCRIPTION A1 DGND Digital Ground A2 MCLK Master Clock A3 IOVDD Digital Interface Power Supply A4 SDA I2C Serial Data Input A5 SCL I2C Clock Input B1 DVDD Digital Power Supply B2 SHDN Active Low Shutdown. Connect to VDD for normal operation. B3 SDIO I2S Serial Data Input/Output B4 WS B5 SCLK Serial Clock Input C1 PLLVDD PLL Power Supply C2 GAIN0 Gain Setting Input 0 C3 GAIN1 Gain Setting Input 1 C4 MODE0 Spatial Mode Control Input 0 C5 MODE1 Spatial Mode Control Input 1 D1 AVDD2 D2 AGND2 ADC Analog Ground D3 AGND1 Modulator Analog Ground D4 OUT1- Channel 1 Inverting Output. Connect to OUT2- in Parallel Mode D5 OUT1+ Channel 1 Non-Inverting Output. Connect to OUT2+ in Parallel Mode E1 INL- Left Channel Inverting Analog Input E2 INL+ Left Channel Non-Inverting Analog Input I2S Word Select Input ADC Analog Power Supply E3 AVDD1 Modulator Analog Power Supply E4 PGND Power Ground E5 PVDD Class D Power Supply F1 INR- Right Channel Inverting Analog Input F2 INR+ Right Channel Non-Inverting Analog Input F3 REF ADC Reference Bypass F4 OUT2- Channel 2 Inverting Output. Connect to OUT1- in Parallel Mode. F5 OUT2+ Channel 2 Non-Inverting Output. Connect to OUT1+ in Parallel Mode. 4 θJA (TLA30) 2) 54°C/W Operating Ratings If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage Supply Voltage AVDD, PVDD, PLVDD, IOVDD (Note 1) 6V Supply Voltage, DVDD (Note 1) 2.2V Storage Temperature −65°C to + 150°C −0.3V to VDD + 0.3V Input Voltage Power Dissipation (Note 3) Internally limited ESD Susceptibility (Note 4) 2000V ESD Susceptibility (Note 5) 150V Junction Temperature 150°C −40°C ≤ TA ≤ +85°C 2.7V ≤ AVDD ≤ 5.5V AVDD 2.7V ≤ PVDD ≤ 5.5V PVDD 2.7V ≤ PLLVDD ≤ 5.5V PLLVDD 1.62V ≤ IOVDD ≤ 5.5V IOVDD 1.62V ≤ DVDD ≤ 1.98V DVDD Electrical Characteristics PVDD = AVDD , IOVDD = PLLVDD = 3.6V, DVDD = 1.8 (Note 2, Note 8) The following specifications apply for AV = 0dB, CREF = 4.7µF, RL = 8Ω, f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. LM48903 Symbol Parameter Conditions Min (Note 8) Typ (Note 7) Max (Note 8) Units (Limits) AVDD Analog Supply Voltage Range 2.7 5.5 V PVDD Amplifier Supply Voltage Range 2.7 5.5 V PLLVDD PLL Supply Voltage Range 2.7 5.5 V IOVDD Interface Supply Voltage Range 1.62 5.5 V DVDD Digital Supply Voltage Range 1.62 AIDD Analog Quiescent Supply Current PIDD Amplifier Quiescent Supply Current PLLIDD 15.2 RL = 8Ω 1.98 V 19 mA 2.6 mA PLL Quiescent Supply Current 1.3 mA DIDD Quiescent Digital Power Supply Current 5.4 5.8 mA ISD Shutdown Current (Analog, Amplifier and PLL Supplies) 0.4 3.5 μA DISTBY Digital Standby Current DISD Digital Shutdown Current VOS Differential Output Offset Voltage VIN = 0 TWU Wake-up Time fSW Switching Frequency Shutdown Enabled μA 30 Shutdown Enabled –7.5 6.6 10 μA 0.8 7.5 mV Power Up (Device Initialization) 150 From Shutdown 28.5 ms fS = 48kHz 384 kHz 5 ms www.ti.com LM48903 Thermal Resistance Absolute Maximum Ratings (Note 1, Note LM48903 LM48903 Symbol Parameter Conditions Min (Note 8) Typ (Note 7) Max (Note 8) Units (Limits) RL = 4Ω, THD+N = 10% f = 1kHz, 22kHz BW VDD = 5V 2.8 W VDD = 3.6V 1.4 W VDD = 5V 2.2 W VDD = 3.6V 1.2 W RL = 4Ω, THD+N = 1% f = 1kHz, 22kHz BW PO Output Power/Channel RL = 8Ω, THD+N = 10% f = 1kHz, 22kHz BW VDD = 5V 1.7 W VDD = 3.6V 860 mW 1.3 W 650 mW VDD = 5V 3.3 W VDD = 3.6V 1.7 W VDD = 5V 2.5 W VDD = 3.6V 1.2 W 0.08 % RL = 8Ω, THD+N = 1% f = 1kHz, 22kHz BW VDD = 5V VDD = 3.6V 500 RL = 4Ω, THD+N = 10%, f = 1kHz, 22kHz BW PO THD+N Output Power (Parallel Mode) Total Harmonic Distortion + Noise RL = 4Ω, THD+N = 1%, f = 1kHz, 22kHz BW PO = 350mW, f = 1kHz, RL = 8Ω VRIPPLE = 200mVP-P sine, Inputs AC GND, CIN = 1μF PSRR Power Supply Rejection Ratio (ADC Path) fRIPPLE = 217Hz, Applied to PVDD 69 dB fRIPPLE = 217Hz, Applied to DVDD 64 dB fRIPPLE = 1kHz, Applied to PVDD 60 68 dB fRIPPLE = 1kHz, Applied to DVDD 56 62 dB fRIPPLE = 10kHz, Applied to PVDD 62 dB fRIPPLE = 10kHz, Applied to DVDD 52 dB 68 dB VRIPPLE = 200mVP-P sine, Inputs –∞dBFS fRIPPLE = 217Hz, Applied to PVDD PSRR Power Supply Rejection Ratio (I2S Path) CMRR Common Mode Rejection Ratio η Efficiency/Channel η Efficiency SNR Signal-to-NoiseRatio www.ti.com fRIPPLE = 217Hz, Applied to DVDD 72 dB fRIPPLE = 1kHz, Applied to PVDD 60 67 dB fRIPPLE = 1kHz, Applied to DVDD 55 69 dB fRIPPLE = 10kHz, Applied to PVDD 58 dB fRIPPLE = 10kHz, Applied to DVDD 56 dB VRIPPLE = 1VP-P, fRIPPLE = 217Hz, AV = 0dB 78 dB VDD = 5V, PO = 1.1W 91 % VDD = 3.6V, PO = 400mW 90 % VDD = 5V, PO = 1.1W 86 % VDD = 3.6V, PO = 400mW 83 % ADC Input, PO = 1W 89 dB I2S Input, PO = 1W 90 dB 6 εOS Parameter Conditions Output Noise XTALK Min (Note 8) Max (Note 8) Units (Limits) Inputs AC GND, A-weighted, AV = 0dB 130 μV I2S Input 72 μV 72 dB Crosstalk I2C Interface Characteristics Typ (Note 7) (Note 1, Note 2) The following specifications apply for RPU = 1kΩ to IOVDD, unless otherwise specified. Limits apply for TA = 25°C. LM48903 Symbol Parameter Conditions VIH Logic Input High Threshold SDA, SCL Min (Note 7) Typ (Note 6) Max (Note 7) 0.7*IOVDD Units V VIL Logic Input Low Threshold SDA, SCL 0.3 mV VOL Logic Output Low Threshold SDA, ISDA = 3.6mA 0.35 V IOH Logic Output High Current SDA, SCL SCL Frequency 1 Hold Time (repeated START Condition) 2 3 2 μA 400 kHz 0.6 µs Clock Low Time 1.3 µs Clock High Time 600 ns 4 Setup Time for Repeated START condition 600 ns 5 Data Hold Time 6 Data Setup Time 7 SDA Rise Time 300 ns 8 SDA Fall Time 300 ns 9 Setup Time for STOP Condition 600 ns 10 Bus Free Time Between STOP and START Condition 1.3 µs Output 300 900 100 ns ns I2S Timing Characteristics (Note 2, Note 8) The following specifications apply for DVDD = 1.8V, unless otherwise specified. Limits apply for TA = 25°C. LM48903 Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units (Limits) tMCLKL MCLK Pulse Width Low 16 ns tMCLKH MCLK Pulse Width High 16 ns tMCLKY MCLK Period 27 tBCLKR SCLK rise time tBCLKCF SCLK fall time tBCLKDS SCLK Duty Cycle ns 3 ns 3 ns 50 % TDL LRC Propagation Delay from SCLK falling edge TDST DATA Setup Time to SCLK Rising Edge 10 ns TDHT DATA Hold Time from SCLK Rising Edge 10 ns 10 7 ns www.ti.com LM48903 LM48903 Symbol LM48903 Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed. Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum allowable power dissipation is PDMAX = (TJMAX − TA) / θJA or the given in Absolute Maximum Ratings, whichever is lower. Note 4: Human body model, applicable std. JESD22-A114C. Note 5: Machine model, applicable std. JESD22-A115-A. Note 6: Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Note 8: RL is a resistive load in series with two inductors to simulate an actual speaker load. For RL = 8Ω, the load is 15μH+8Ω+15μH. For RL = 4Ω, the load is 15μH+4Ω+15μH. www.ti.com 8 LM48903 Typical Performance Characteristics THD+N vs FREQUENCY VDD = 3.6V, POUT = 400mW, RL = 8Ω Stereo Mode, I2S Input THD+N vs FREQUENCY VDD = 3.6V, POUT = 500mW, RL = 4Ω Stereo Mode, I2S Input 301858e6 301858e4 THD+N vs FREQUENCY VDD = 3.6V, POUT = 250mW, RL = 4Ω Stereo Mode, ADC Input THD+N vs FREQUENCY VDD = 3.6V, POUT = 200mW, RL = 8Ω Stereo Mode, ADC Input 301858e0 301858d9 THD+N vs FREQUENCY VDD = 5V, POUT = 1.2W, RL = 4Ω Stereo Mode, I2S Input THD+N vs FREQUENCY VDD = 5V, POUT = 800mW, RL = 8Ω Stereo Mode, I2S Input 301858e5 301858e7 9 www.ti.com LM48903 THD+N vs FREQUENCY VDD = 5V, POUT = 550mW, RL = 4 Ω Stereo Mode, ADC Input THD+N vs FREQUENCY VDD = 5V, POUT = 350mW, RL = 8Ω Stereo Mode, ADC Input 30185857 301858e1 THD+N vs FREQUENCY VDD = 3.6V, POUT = 800mW, RL = 4Ω Parallel Mode, I2S Input THD+N vs FREQUENCY VDD = 3.6V, POUT = 350mW, RL = 4Ω Parallel Mode, ADC Input 301858e2 301858e8 THD+N vs FREQUENCY VDD = 5V, POUT = 800mW, RL = 4Ω Parallel Mode, I2S Input THD+N vs FREQUENCY VDD = 5V, POUT = 1.7W, RL = 4Ω Parallel Mode, I2S Input 301858e9 301858e3 www.ti.com 10 THD+N vs OUTPUT POWER RL = 8Ω, f = 1kHz, Stereo Mode, I2S Input 301858d6 301858d5 LM48903 THD+N vs OUTPUT POWER RL = 4Ω, f = 1kHz, Stereo Mode, I2S Input THD+N vs OUTPUT POWER RL = 4Ω, f = 1kHz, Stereo Mode, ADC Input THD+N vs OUTPUT POWER RL = 4Ω, f = 1kHz, Parallel Mode, I2S Input 301858d7 301858d3 THD+N vs OUTPUT POWER RL = 8Ω, f = 1kHz, Stereo Mode, ADC Input THD+N vs OUTPUT POWER RL = 4Ω, f = 1kHz, Parallel Mode, ADC Input 301858d2 301858d4 11 www.ti.com LM48903 EFFICIENCY vs OUTPUT POWER RL = 4Ω, f = 1kHz, Stereo Mode, ADC Input EFFICIENCY vs OUTPUT POWER RL = 8Ω, f = 1kHz, Stereo Mode, ADC Input 301858f0 301858f1 POWER DISSIPATION vs OUTPUT POWER RL = 4Ω, Per Channel, Stereo Mode, ADC Input POWER DISSIPATION vs OUTPUT POWER RL = 8Ω, Per Channel, Stereo Mode, ADC Input 301858f3 301858f2 OUTPUT POWER vs SUPPLY VOLTAGE RL = 4Ω, Stereo Mode, ADC Input OUTPUT POWER vs SUPPLY VOLTAGE RL = 4Ω, Stereo Mode, ADC Input 301858f5 301858f4 www.ti.com 12 LM48903 OUTPUT POWER vs SUPPLY VOLTAGE RL = 8Ω, Stereo Mode, ADC Input PSRR vs FREQUENCY PVDD = 5V, VRIPPLE = 200mVP-P, RL = 8Ω, ADC Input = AC GND 301858f6 301858c1 PSRR vs FREQUENCY DVDD = 1.8V, VRIPPLE = 200mVP-P, RL = 8Ω, ADC Input = AC GND PSRR vs FREQUENCY PVDD = 5V, VRIPPLE = 200mVP-P, RL = 8Ω, I2S input = –120dBFS 301858c2 301858c3 PSRR vs FREQUENCY DVDD = 1.8V, VRIPPLE = 200mVP-P, RL = 8Ω, I2S input = –120dBFS CMRR vs FREQUENCY VRIPPLE = 200mVP-P, RL = 8Ω, 301858c5 301858c4 13 www.ti.com LM48903 SUPPLY CURRENT vs SUPPLY VOLTAGE ADC Mode ANALOG SUPPLY CURRENT vs SUPPLY VOLTAGE ADC Mode 301858c6 301858c7 PLL SUPPLY CURRENT vs SUPPLY VOLTAGE DIGITAL SUPPLY CURRENT vs SUPPLY VOLTAGE 30185859 30185858 SHUTDOWN CURRENT vs SUPPLY VOLTAGE DIGITAL SHUTDOWN CURRENT vs SUPPLY VOLTAGE 301858d0 www.ti.com 301858d1 14 I2C COMPATIBLE INTERFACE The LM48903 is controlled through an I2C compatible serial interface that consists of a serial data line (SDA) and a serial clock (SCL). The clock and data lines are bi-directional (open drain). The LM48903 communicates at clock rates up to 400kHz. Figure 2 shows the I2C interface timing diagram. Data on the SDA line must be stable during the HIGH period of SCL. The LM48903 is a transmit/receive device, and can act 30185840 FIGURE 2. I2C Timing Diagram 30185841 FIGURE 3. Start and Stop Diagram 15 www.ti.com LM48903 as the I2C master, generating the SCL signal. Each transmission sequence is framed by a START condition and a STOP condition Figure 3. Due to the number of data registers, the LM48903 employs a page mode scheme. Each data write consists of 7, 8 bit data bytes, device address (1 byte), 16 bit register address (2 bytes), and 32 bit register data (4 bytes). Each byte is followed by an acknowledge pulse Figure 4. Single byte read and write commands are ignored. The LM48903 device address is 0110000X. Application Information LM48903 Once the master device registers the ACK bit, the first 8-bit register address word is sent, MSB first [15:8]. Each data bit should be stable while SCL is HIGH. After the first 8-bit register address is sent, the LM48903 sends another ACK bit. Upon receipt of acknowledge, the second 8-bit register address word is sent [7:0], followed by another ACK bit. The register data is sent, 8-bits at a time, MSB first in the following order [7:0], [15:8], [23:16], [31.24]. Each 8-bit word is followed by an ACK, upon receipt of which the successive 8-bit word is sent. Following the acknowledgement of the last register data word [31:24], the master issues a STOP bit, allowing SDA to go high while SDA is high. WRITE SEQUENCE The example write sequence is shown in Figure 4. The START signal, the transition of SDA from HIGH to LOW while SDA is HIGH, is generated, altering all devices on the bus that a device address is being written to the bus. The 7-bit device address is written to the bus, most significant bit (MSB) first, followed by the R/W bit (R/W = 0 indicating the master is writing to the LM48903). The data is latched in on the rising edge of the clock. Each address bit must be stable while SDA is HIGH. After the R/W\ bit is transmitted, the master device releases SDA, during which time, an acknowledge clock pulse is generated by the slave device. If the LM48903 receives the correct address, the device pulls the SDA line low, generating and acknowledge bit (ACK). 301858g0 FIGURE 4. Example I2C Write Sequence LM48903. Upon receipt of the acknowledge, the second 8-bit register address word is sent [7:0], followed by another ACK bit. Following the acknowledgment of the last register address, the master initiates a REPEATED START, followed by the 7-bit device address, followed by R/W = 1 (R/W = 1 indicating the master wants to read data from the LM48903). The LM48903 sends an ACK, followed by the selected register data. The register data is sent, 8-bits at a time, MSB first in the following order [7:0], [15:8], [23:16], [31:24]. Each 8-bit word is followed by an ACK, upon receipt of which the successive 8-bit word is sent. Following the acknowledgement of the last register data word [7:0], the master issues a STOP bit, allowing SDA to go high while SDA is high. READ SEQUENCE The example read sequence is shown in Figure 5. The START signal, the transition of SDA from HIGH to LOW while SDA is HIGH, is generated, altering all devices on the bus that a device address is being written to the bus. The 7-bit device address is written to the bus, followed by the R/W = 0. After the R/W bit is transmitted, the master device releases SDA, during which time, an acknowledge clock pulse is generated by the slave device. If the LM48903 receives the correct address, the device pulls the SDA line low, generating and acknowledge bit (ACK). Once the master device registers the ACK bit, the first 8-bit register address word is sent, MSB first [15:8], followed by and ACK from the 301858g1 FIGURE 5. Example I2C Read Sequence www.ti.com 16 301858b4 FIGURE 6. I2S Normal Input Format 301858b5 FIGURE 7. I2S Left Justified Input Format 301858b6 FIGURE 8. I2S Right Justified Input Format 17 www.ti.com LM48903 Mode, the audio data format is similar to the Normal Mode, without the delay between the LSB and the change in I2S_WS. In Right Justified Mode, the audio data MSB is transmitted after a delay of a preset number of bits. I2S DATA FORMAT The LM48903 supports three I2S formats: Normal Mode Figure 6, Left Justified Mode Figure 7, and Right Justified Mode Figure 8. In Normal Mode, the audio data is transmitted MSB first, with the unused bits following the LSB. In Left Justified LM48903 configuration settings, and a 48-bit wide Audio Sample Space that holds the current audio data sampled from either the ADCs or the I2S interface, organized as shown in Figure 9. MEMORY ORGANIZATION The LM48903 memory is organized into three main regions: a 32-bit wide Coefficient Space that holds the spatial coefficients, a 32-bit wide Register Space that holds the device 301858g4 FIGURE 9. LM48903 Memory Organization Register 1 (0x504h) = 1 to enable Debug mode. The Coefficient Memory Space is organized as follows. COEFFICIENT MEMORY The device must be in Debug mode in order to write to the Coefficient memory. Set Bit 7 (DBG_ENABLE) in Filter Debug TABLE 2. Coefficient Memory Space REGISTER ADDRESS REGISTER CONTENTS (31:16) (15:0) 0x000h - 0x0FFh 256x16 bit Array Taps (Right Input to OUT2) 256x16 bit Array Taps (Left Input to OUT2) 0x100h - 0x1FFh 256x16 bit Array Taps (Right Input to OUT1) 256x16 bit Array Taps (Left Input to OUT1) 0x400h - 0x47Eh (EVEN) C2 128x16 bit Prefilter Taps (Right to Right) C0 128x16 bit Prefilter FIR Taps (Left to Left) 0x441h - 0x47Fh (ODD) C3 128x16 bit Prefilter Taps (Right to Left) C1 128x16 bit Prefilter FIR Taps (Left to Right) www.ti.com 18 LM48903 CONTROL REGISTERS TABLE 3. Register Map Register Name FILTER CONTRO L FILTER COMP1 FILTER COMP2 FILTER DEBUG0 FILTER DEBUG1 FILTER STATS Register Address Default Value 0x500h [7:0] 0xFFh 0x500h [15:8] 0x7Fh 0x500h [23:16] 0xE4h 0x500h [31:24] 0xC1h 0x501h [7:0] 0x98h 0x501h [15:8] 0x11h 0x501h [23:16] 0x00h ARRAY_COMP_SELECT 0x501h [31:24] 0x00h UNUSED 0x502h [7:0] 0XB8h 0x502h [15:8] 0x11h 0x502h [23:16] 0XB8h 0x502h [31:24] 0x11h 0x503h [7:0] 0x00h DBG_DATA [7:0] 0x503h [15:8] 0x00h DBG_DATA [15:8] 0x503h [23:16] 0x00h DBG_DATA [23:16] 0x503h [31:24] 0x00h UNUSED 0x504h [7:0] 0x00h 0x504h [15:8] 0x00h UNUSED 0x504h [23:16] 0x00h UNUSED 0x504h [31:24] 0x00h UNUSED 0x505h [7:0] 0x00h 0x505h [15:8] 0x80h 0x505h [23:16] 0x00h 0x505h [31:24] 0x80h 7 6 5 4 3 2 1 0 ARRAY_TAP UNUSED PRE_TAP UNUSED ARRAY_ ENABLE PRE_ ENABLE CH2_SEL ARRAY_ BYPASS PRE_ BYPASS UNUSED G1_GAIN UNUSED COMP_TH POST_GAIN UNUSED G1_GAIN UNUSED UNUSED G1_GAIN DBG_ ENABLE UNUSED PCOUNT1_MODE PCLEAR UNUSED ACOUNT1_MODE ACLEAR COMP_RATIO COMP_TH POST_GAIN STEP_ ENABLE COMP_RATIO COMP_TH POST_GAIN UNUSED CH1_SEL UNUSED 19 UNUSED FILTER_ SELECT COMP_RATIO ACC_ADDR PCH_SEL PCOUNT2_MODE ACH_SEL ACOUNT2_MODE www.ti.com LM48903 Register Name FILTER DEBUG1 ACCUML DEBUG (READONLY) ACCUMH DEBUG (READONLY) DBG SAT (READONLY) STAT PCNT1 (READONLY) STAT PCNT2 (READONLY) www.ti.com Register Address Default Value 0x506h [7:0] 0x00h DBG_DATA [7:0] 0x506h [15:8] 0x00h DBG_DATA [15:8] 0x506h [23:16] 0x00h DBG_DATA [23:16] 0x506h [31:24] 0x00h DBG_DATA [31:24] 0x509h [7:0] 0xXXh DBG_ACCL [7:0] 0x509h [15:8] 0xXXh DBG_ACCL [15:8] 0x509h [23:16] 0xXXh DBG_ACCL [23:16] 0x509h [31:24] 0xXXh DBG_ACCL [31:24] 0x50Ah [7:0] 0xXXh DBG_ACC [39:32] 0x50Ah [15:8] 0xXXh DBG_ACC [47:40] 0x50Ah [23:16] 0xXXh UNUSED 0x50Ah [31:24] 0xXXh UNUSED 0x50Bh [7:0] 0xXXh DBG_SAT [7:0] 0x50Bh [15:8] 0xXXh DBG_SAT [15:8] 0x50Bh [23:16] 0xXXh DBG_SAT [23:16] 0x50Bh [31:24] 0xXXh UNUSED 0x50Ch [7:0] 0xXXh COUNT [7:0] 0x50Ch [15:8] 0xXXh COUNT [15:8] 0x50Ch [23:16] 0xXXh COUNT [23:16] 0x50Ch [31:24] 0xXXh COUNT [31:24] 0x50Dh [7:0] 0xXXh COUNT [7:0] 0x50Dh [15:8] 0xXXh COUNT [15:8] 0x50Dh [23:16] 0xXXh COUNT [23:16] 0x50Dh [31:24] 0xXXh COUNT [31:24] 7 6 5 20 4 3 2 1 0 STAT ACNT1 (READONLY) STAT ACNT2 (READONLY) ADC OFFSET CLASS D OFFSET DELAY ENABLE & CLOCKS Register Address Default Value 0x50Eh [7:0] 0xXXh COUNT [7:0] 0x50Eh [15:8] 0xXXh COUNT [15:8] 0x50Eh [23:16] 0xXXh COUNT [23:16] 0x50Eh [31:24] 0xXXh COUNT [31:24] 0x50Fh [7:0] 0xXXh COUNT [7:0] 0x50Fh [15:8] 0xXXh COUNT [15:8] 0x50Fh [23:16] 0xXXh COUNT [23:16] 0x50Fh [31:24] 0xXXh COUNT [31:24] 0x510h [7:0] 0X00h ADCR_VOS [7:0] 0x510h [15:8] 0X00h ADCR_VOS [15:8] 0x510h [23:16] 0X00h ADCL_VOS [7:0] 0x510h [31:24] 0X00h ADCL_VOS [15:8] 0x511h [7:0] 0X00h OUT1_VOS [7:0] 0x511h [15:8] 0X00h OUT1_VOS [15:8] 0x511h [23:16] 0X00h OUT2_VOS [7:0] 0x511h [31:24] 7 6 5 4 3 0X00h OUT2_VOS [15:8] 0x520h [7:0] 0x06h POWER_UP_DELAY [7:0] 0x520h [15:8] 0x00h POWER_UP_DELAY [15:8] 0x520h [23:16] 0x20h DEGLITCH_DELAY 0x520h [31:24] 0x09h STATE_DELAY 0x521h [7:0] 0x00h PWM_DC ADC_SYN ADC_DC_ ADC_DC_ _CORREC C_SEL CORRECT CAL T 0x521h [15:8] 0x20h QSA_ QSA_MBI CLK_STO ST P 0x521h [23:16] 0x00h UNUSED 0x521h [31:24] 0x00h 2 1 0 PULSE FORCE ENABLE VREF_ DELAY PCM_ HIFI CLK_SEL I2S_CLK ADC_HPF ADC_HPF _TO_1_4 _ENABLE UNUSED 21 MCLK_RATE ADC_HPF_MODE OFFSET_READBACK_SELECT www.ti.com LM48903 Register Name LM48903 Register Name DIGITAL MIXER ANALOG I2S PORT ADC TRIM CO-EF FICIENT www.ti.com Register Address Default Value 7 6 0x522h [7:0] 0x33h ZERO_ CROSS MUTE 0x522h [15:8] 0x33h 0x522h [23:16] 0x02h UNUSED I2SA_TX_SEL 0x522h [31:24] 0x05h UNUSED OUT2_SEL 0x523h [7:0] 0x00h 0x523h [15:8] 0x10h 0x523h [23:16] 0x00h 0x523h [31:24] 0x00h 0x524h [7:0] 0x01h 0x524h [15:8] 0x00h 0x524h [23:14] 0x00h 0x524h [31:24] 0x00h UNUSED MONO_SYNC_WIDTH SYNC_RATE 0x525h [7:0] 0x00h TX_BIT TX_WIDTH RX_WIDTH 0x525h [15:8] 0x02h 0x525h [23:16] 0x02h 0x525h [31:24] 0x00h UNUSED 0x526h [7:0] 0x00h ADC_COMP_COEFF_C0 [7:0] 0x526h [15:8] 0x00h ADC_COMP_COEFF_C0 [15:8] 0x526h [23:14] 0x00h ADC_COMP_COEFF_C1 [7:0] 0x526h [31:24] 0x00h ADC_COMP_COEFF_C1 [15:8] 0x527h [7:0] 0x00h ADC_COMP_COEFF_C2 [7:0] 0x527h [15:8] 0x00h ADC_COMP_COEFF_C2 [15:8] 0x527h [23:16] 0x00h UNUSED 0x527h [31:24] 0x00h UNUSED 5 4 3 2 1 0 ADC_DS P I2S_DSP ADC_LVL UNUSED I2S_LVL BYPASS_ AUTO_SD ADCTRIM MOD ZERO_DI G SCAN_TRI SE_MOD G UNUSED OUT1_SEL ZERO_AN A PARALL EL ANA_LVL PMC_ TEST TSD_DIS SCKT_DI TST_SHT S UNUSED I2C_ANA _LEVEL UNUSED SYNC_ MODE STEREO_ SYNC_ PHASE CLOCK_ SYNC_MS PHASE UNUSED A/µLAW TX_ A/µLAW RX_ ENABLE ENABLE STEREO HALF_CYCLE_DIVIDER SYNTH_ DENOM UNUSED RX_ TX_ CLK_MS SYNTH_NUM RX_ COMPAN D RX_MSB_POSITION RX_MOD E TX_ COMPAN D TX_MSB_POSITION TX_MOD E 22 READ BACK0 (READONLY) READ BACK1 (READONLY) SYS CONFIG Register Address Default Value 0x528h [7:0] 0x00h 0x528h [15:8] 0x00h 0x528h [23:14] 0x00h SPARE 0x528h [31:24] 0x00h UNUSED 0x529h [7:0] 0x00h 0x529h [15:8] 0x00h OFF_RD_BACK [11:4] 0x529h [23:14] 0x00h OFF_RD_BACK [19:12] 0x529h [31:24] 0x00h SPARE_RD_BACK 0x530h [7:0] 0x30h 0x530h [15:8] 0x00h 0x530h [23:16] 0x8Ch 0x530h [31:24] SPEAKE R OVER DRIVE CONTRO L SODP THRES HOLD LOW POWER CONTRO L 7 6 5 4 I2SL_LVL UNUSED CLIP UNUSED 3 I2SR_LVL ADCL_LVL CLIP CLIP 2 0 ADCL_ ADCR_ CLIP CLIP SHORT2 SHORT1 ADCR_L VL CLIP THERMAL OFF_RD_BACK [3:0] 1 CE_STATE I2C_MCL K_REQ DEVICE_ID UNUSED I2C_SP_MOD W_CLE _EN USE_22C USE_RA _ROM_S M EL UNUSED MBIST1_ MBIST0_ ENABLE ENABLE UNUSED 0x00h 0x531h [7:0] 0x65h 0x531h [15:8] 0x43h 0x531h [23:16] 0x83h 0x531h [31:24] 0x27h 0x532h [7:0] 0x70h LEVEL1 0x532h [15:8] 0x20h LEVEL2 0x532h [23:16] 0x64h INT_TH1 0x532h [31:24] 0x64h INT_TH2 0x533h [7:0] 0x00h 0x533h [15:8] 0x09h 0x533h [23:16] 0x00h ADC_TH [11:4] 0x533h [31:24] 0x00h OVR_AD OVR_ADC OVR_VRE OVR_OU OVR_PLL OVR_OUT OVR_OU OVR_OU CL_ENAB R_ENABL F_ENABL T2_ENAB _ENABLE 1_ENABLE T1_RST T2_RST LE E E LE W2 UNUSED W1 RL_RES UNUSED MAX_GAIN SODP_E NABLE FS UNUSED AT_GAIN SINP_MODE UNUSED LOW_PWR_MODE UNUSED ADC_TH [3:0] 23 AT_RES INT_GAIN AUDET_LEVEL AUDET _ENABLE TIMEOUT_DELAY www.ti.com LM48903 Register Name LM48903 Register Name SYSTEM STATUS DEVICE ID SPEAKE R OVER DRIVE DEBUG Register Address Default Value 0x538h [7:0] 0x00h 0x538h [15:8] 0x00h 0x538h [23:16] 0x00h MEM_ADDR [7:0] 0x538h [31:24] 0x00h MEM_ADDR [15:8] 0x539h [7:0] 0XA0h CHIP_ID [7:0] 0x539h [15:8] 0x3Ah CHIP_ID [15:8] 0x539h [23:16] 0x90h CHIP_ID [23:16] 0x539h [31:24] 0x48h CHIP_ID [31:24] 7 6 2b0 5 4 3 MBIST_ENABLE 2 1 MBIST_GO CL_ACTI VE UNUSED 0x53Ah [7:0] SODP_INT [7:0] 0x53Ah [15:8] SODP_INT [15:8] 0x53Ah [23:16] SODP_INT[23:16] 0x53Ah [31:24] GAIN_INT_MAG 0 MBIST_DONE BUS_ER ROR DEV_EXI STS FILTER CONTROL REGISTER (0x500h) Configures the LM48903 Array and Pre-Array filters (Spatial Engine). The Filter Control Register sets the length of the Array and Pre-Array filter taps, and selects the filter channel source for each audio output. Set PRE_BYPASS and ARRAY_BYPASS to 1 to bypass the Spatial Engine, disabling the spatial effect without modifying the coefficients. Set PRE_ENABLE and ARRAY_ENABLE to 1 to enable the Spatial Engine. Set PRE_ENABLE and ARRAY_ENABLE to 0 to disable the spatial engine. Disabling the Spatial Engine does not affect the register contents. Disable the Spatial Engine during coefficient programming. TABLE 4. Filter Control Register BIT NAME 7:0 ARRAY_TAP 14:8 PRE_TAP 15 UNUSED 17:16 CH1_SEL VALUE DESCRIPTION Array Filter Tap Length Pre-filter Tap Length. Pre-filter tap length should be less than or equal to the Array filter tap length Channel 1 Output Routing Selection 0 Array Filter Channel 0 Output Select 1 Array Filter Channel 1 Output Select Channel 2 Output Routing Selection 19:18 www.ti.com CH2_SEL 27:20 UNUSED 28 PRE_BYPASS 29 ARRAY_BYPASS 0 Array Filter Channel 0 Output Select 1 Array Filter Channel 1 Output Select 0 Pre-Array filter not bypassed 1 Pre-Array filter bypassed 0 Array filter not bypassed 1 Array filter bypassed 24 30 31 NAME PRE_ENABLE ARRAY_ENABLE VALUE DESCRIPTION 0 Pre-Array filter disabled. Disable the Pre-Array Filter during filter and coefficient programming. Disabling the Pre-Array Filter does not affect the device memory contents. 1 Pre-Array filter enabled 0 Array filter disabled. Disable the Array Filter during filter and coefficient programming. Disabling the Array Filter does not affect the device memory contents. 1 Array filter enabled COMPRESSOR CONTROL REGISTER 1 (FILTER COMP1) (0x501h) TABLE 5. Compressor Control Register BIT NAME 4:0 COMP_TH VALUE DESCRIPTION Pre-Filter Compressor Threshold Pre-Compression Gain 7:5 G1_GAIN 000 2 001 4 010 8 011 16 100 32 101 64 110 128 111 256 Compression Ratio 10:8 11 COMP_RATIO 000 1:1 001 2:1 010 2.66:1 011 4:1 100 5.33:1 101 8:1 110 10.66:1 111 16:1 UNUSED Post Compression Gain (V/V) 14:12 POST_GAIN 15 UNUSED 23:16 ARRAY_COMP_SELECT 31:24 UNUSED 000 1 001 1.25 010 1.5 011 2 100 2.5 101 3 110 4 111 8 Array Filter Compression Control Register Select 25 www.ti.com LM48903 BIT LM48903 COMPRESSOR CONTROL REGISTER 2 (FILTER COMP2) (0x502h) TABLE 6. Compressor Control Register 2 BIT NAME 4:0 COMP_TH VALUE DESCRIPTION Pre-Filter Compressor Threshold Pre-Compression Gain 7:5 G1_GAIN 000 2 001 4 010 8 011 16 100 32 101 64 110 128 111 256 Compression Ratio 000 10:8 11 COMP_RATIO 1:1 001 2:1 010 2.66:1 011 4:1 100 5.33:1 101 8:1 110 10.66:1 111 16:1 UNUSED Post Compression Gain (V/V) 14:12 POST_GAIN 15 UNUSED 20:16 COMP_TH 0 1 1 1.25 10 1.5 11 2 100 2.5 101 3 110 4 111 8 Pre-Filter Compressor Threshold Pre-Compression Gain 23:21 www.ti.com G1_GAIN 0 2 1 4 10 8 11 16 100 32 101 64 110 128 111 256 26 NAME VALUE LM48903 BIT DESCRIPTION Compression Ratio 24:26 COMP_RATIO 27 000 1:001 001 2:001 010 2.66:1 011 4:001 100 5.33:1 101 8:001 110 10.66:1 111 16:1 UNUSED Post Compression Gain (V/V) 30:28 POST_GAIN 31 000 1 001 1.25 010 1.5 011 2 100 2.5 101 3 110 4 111 8 UNUSED FILTER DEBUG REGISTER 0 (FILT_DBG0) (0x503h) TABLE 7. Filter Debug Register 0 BIT NAME 23:0 DBG_DATA 31:24 UNUSED VALUE DESCRIPTION Audio Data. Common data for both left and right audio channels FILTER DEBUG REGISTER 1 (FILT_DBG1) (0x504h) TABLE 8. Filter Debug Register 1 BIT NAME 3:0 ACC_ADDR 4 FILTER_SELECT 5 UNUSED 6 STEP_ENABLE 7 DBG_ENABLE 31:8 UNUSED VALUE DESCRIPTION Accumulator Address. Selects which accumulator is read during debug mode 0 Selects Pre-Filter Accumulators 1 Selects Array Filter Accumulators 0 Single Step Disabled 1 Single Step Enabled 0 Debug Mode Disabled 1 Debug Mode Enabled 27 www.ti.com LM48903 FILTER STATISTICS CONTROL REGISTER (FILT_STC) (0x505h) TABLE 9. Filter Statistics Control Register BIT NAME VALUE DESCRIPTION PRE-FILTER Counter Channel Select 3:0 PCH_SEL 000 Channel 0 001 Channel 1 010 Channel 2 011 Channel 3 100 Channel 4 101 Channel 5 110 Channel 6 111 Channel 7 Counter 1 Mode Select. Specifies input of Counter 1 7:4 PCOUNT1_MODE 0000 Sample Count Mode. Every audio sample is counted 0001 Overflow. Overflow events counted 0010 Frequency Error. Indicates input frequency not sufficient for given filter length 1000 MAGN[7} 1001 MAGN[7:6] 1010 MAGN[7:5} 1011 MAGN[7:4} 1100 MAGN[7:3} 1101 MAGN[7:2] 1110 MAGN[7:1} 1111 MAGN[7:0] Counter 2 Mode Select. Specifies input of Counter 2 11:8 PCOUNT2_MODE 14:12 UNUSED 15 PCLEAR 0000 Sample Count Mode. Every audio sample is counted 0001 Overflow. Overflow events counted 0010 Frequency Error. Indicates input frequency not sufficient for given filter length 1000 MAGN[7} 1001 MAGN[7:6] 1010 MAGN[7:5} 1011 MAGN[7:4} 1100 MAGN[7:3} 1101 MAGN[7:2] 1110 MAGN[7:1} 1111 MAGN[7:0] 0 Counter Enabled 1 Counter Cleared ARRAY-FILTER Counter www.ti.com 28 NAME VALUE LM48903 BIT DESCRIPTION Channel Select 19:16 ACH_SEL 000 Channel 0 001 Channel 1 010 Channel 2 011 Channel 3 100 Channel 4 101 Channel 5 110 Channel 6 111 Channel 7 Counter 1 Mode Select. Specifies input of Counter 1 23:20 ACOUNT1_MODE 0000 Sample Count Mode. Every audio sample is counted 0001 Overflow. Overflow events counted 0010 Frequency Error. Indicates input frequency not sufficient for given filter length 1000 MAGN[7} 1001 MAGN[7:6] 1010 MAGN[7:5} 1011 MAGN[7:4} 1100 MAGN[7:3} 1101 MAGN[7:2] 1110 MAGN[7:1} 1111 MAGN[7:0] Counter 2 Mode Select. Specifies input of Counter 2 27:24 ACOUNT2_MODE 30:28 UNUSED 31 ACLEAR 0000 Sample Count Mode. Every audio sample is counted 0001 Overflow. Overflow events counted 0010 Frequency Error. Indicates input frequency not sufficient for given filter length 1000 MAGN[7} 1001 MAGN[7:6] 1010 MAGN[7:5} 1011 MAGN[7:4} 1100 MAGN[7:3} 1101 MAGN[7:2] 1110 MAGN[7:1} 1111 MAGN[7:0] 0 Counter Enabled 1 Counter Cleared FILTER DEBUG REGISTER 2 (FILTER DEBUG 2) (0x506h) TABLE 10. Filter Debug Register 2 BIT NAME 31:0 DGB_DATA VALUE DESCRIPTION Debug Data. Read Only ACCUMULATOR DEBUG LOWER REGISTER (ACCUML DEBUG) (0x509h) TABLE 11. Accumulator Debug Lower Register BIT NAME 31:0 DBG_ACCL VALUE DESCRIPTION Accumulator Debug Data. Read Only 29 www.ti.com LM48903 ACCUMULATOR DEBUG UPPER REGISTER (ACCUML DEBUG) (0x50Ah) TABLE 12. Accumulator Debug Upper Register BIT NAME VALUE 31:0 DBG_ACCL DESCRIPTION Accumulator Debug Data. Read Only COMPRESSOR OUTPUT DATA REGISTER (DBG_SAT) (0x50Bh) TABLE 13. Compressor Output Data Register BIT NAME 23:0 DBG_SAT VALUE 31:24 UNUSED DESCRIPTION 24-Bit Compressor Output Data. Read Only FILTER STATISTICS COUNTER (STAT_ACNT) (0x50Ch) TABLE 14. Filter Statistics Counter Register BIT 31:0 NAME VALUE DESCRIPTION Statistics of Post-Processed Array and Pre-Filter Data. Read Only COUNT FILTER STATISTICS COUNTER (STAT_ACNT) (0x50Dh) TABLE 15. Filter Statistics Counter Register BIT 31:0 NAME VALUE DESCRIPTION Statistics of Post-Processed Array and Pre-Filter Data. Read Only COUNT FILTER STATISTICS COUNTER (STAT_ACNT) (0x50Eh) TABLE 16. Filter Statistics Counter Register BIT NAME 31:0 COUNT VALUE DESCRIPTION Statistics of Post-Processed Array and Pre-Filter Data. Read Only FILTER STATISTICS COUNTER (STAT_ACNT) (0x50Fh) TABLE 17. Filter Statistics Counter Register BIT 31:0 NAME VALUE DESCRIPTION Statistics of Post-Processed Array and Pre-Filter Data. Read Only COUNT ADC DC OFFSET REGISTER (ADC OFFSET) (0x510h) TABLE 18. ADC DC Offset Register BIT NAME VALUE DESCRIPTION 15:0 ADCR_VOS ADC Right Channel Output DC Offset 31:16 ADCL_VOS ADC Left Channel Output DC Offset CLASS D DC OFFSET REGISTER (CLASS D OFFSET) (0x511h) TABLE 19. Class D DC Offset Register www.ti.com BIT NAME 15:0 OUT1_VOS VALUE OUT1 Output DC Offset 31:16 OUT2_VOS OUT2 Output DC Offset 30 DESCRIPTION LM48903 DELAY REGISTER (DELAY) (0x520h) TABLE 20. Delay Register BIT NAME 15:0 POWER_UP_DELAY 23:16 DEGLITCH_DELAY 31:24 STATE_DELAY VALUE DESCRIPTION Sets I2C Delay Time. Default 10ms delay. Sets ENABLE Bit Polling Timeout. Default 32ms delay Sets Delay Between Power Up/Down States ENABLE AND CLOCK CONFIGURATION REGISTER (ENABLE & CLOCKS) (0x521h) TABLE 21. Enable and Clock Configuration Register BIT NAME 0 ENABLE 1 FORCE 2 PULSE 3 RELY_ON_VREF 4 PWM_DC_CORRECT 5 ADC_DC_CAL 6 ADC_DC_CORRECT 7 ADC_SYNC_SEL VALUE DESCRIPTION 0 Device Disabled in Manual Mode 1 Device Enabled in Manual Mode 0 Device Enabled Via SHDN Pin 1 Device Enabled Via I2C 0 SHDN Requires a Stable Logic Level 1 SHDN Accepts a Pulse Input 0 Device waits for delay time determined by STATE_DELAY to enable. 1 Device waits for stable VREF 0 Disable Class D Offset Correction 1 Enable Class D Offset Correction 0 Disable ADC Offset Calibration 1 Enable ADC Offset Calibration 0 Disable ADC Offset Correction 1 Enable ADC Offset Correction 0 Normal Operation 1 Invert SYNC Signal. Increases timing margin at low supplies Selects PLL Input Divider 10:8 11 MCLK_RATE I2S_CLK 12 PMC_CLK_SEL 13 HIFI 14 SAP_CLK_STOP 15 SAP_MBIST 000 32fs (1.536MHz) 001 64fs (3.072MHz) 010 128fs (6.114MHz) 011 256fs (12.288MHz) 100 512fs (24.576MHz) 101 UNUSED 110 UNUSED 111 UNUSED 0 MCLK Input to PLL 1 I2S_CLK Input to PLL 0 Oscillator Clock Input to Power Management Circuitry 1 MCLK or I2S_CLK Input to Power Management Circuitry. Clock source depends on the state of I2S_CLK 0 HiFi Mode Disabled 1 HiFi Mode Enabled. PLL always produces a 4096fs clock. 0 SAP Clock Enabled 1 SAP Clock Disabled Following Device Configuration 0 Disable MBIST 1 Enable MBIST 31 www.ti.com LM48903 BIT NAME VALUE DESCRIPTION ADC High Pass Filter Mode 000 001 010 18:16 ADC_HPF_MODE 011 100 101 110 111 19 ADC_HPF_ENABLE 31:20 UNUSED 0 ADC High Pass Filter Disabled 1 ADC High Pass Filter Enabled DIGITAL MIXER CONTROL REGISTER (DIGITAL MIXER) (0x522h) TABLE 22. Digital Mixer Control Register BIT NAME VALUE DESCRIPTION Sets the Gain of the ADC Path (dB) 5:0 6 7 ADC_LVL MUTE ZXD_DISABLE 000000 -76.5 000001 -75 - 1.5dB steps 110010 -1.5 110011 0 110100 1.5 - 1.5dB Steps 111111 18 0 Normal Operation 1 Mute 0 Zero Crossing Detection Enabled 1 Zero Crossing Detection Disabled Sets the Gain of the I2S Path (dB) 000000 13:8 I2S_LVL 15:14 UNUSED 16 I2S_DSP 17 ADC_DSP -76.5 000001 -75 - 1.5dB steps 110010 -1.5 110011 0 110100 1.5 - 1.5dB Steps 111111 18 0 I2S Data Not Passed to DSP 1 I2S Data Passed to DSP 0 ADC Output Not Passed to DSP 1 ADC Output Passed to DSP Selects Input of Primary I2S Transmitter 19:18 23:20 www.ti.com ISA_TX_SEL 00 None 01 ADC 10 DSP 11 UNUSED UNUSED 32 NAME VALUE LM48903 BIT DESCRIPTION Selects OUT1 Amplifier Input Source 25:24 OUT1_SEL 00 OUT1 Disabled 01 DSP 10 I2S 11 ADC Selects OUT2 Amplifier Input Source 27:26 31:28 OUT2_SEL 00 OUT2 Disabled 01 DSP 10 I2S 11 ADC UNUSED ANALOG CONFIGURATION REGISTER (ANALOG) (0x523h) TABLE 23. Analog Configuration Register BIT NAME VALUE DESCRIPTION Sets ADC Preamplifier Gain (dB) 1:00 2 ANA_LVL 0 11 2.4 10 3.5 11 6 0 Normal Operation. OUT1 and OUT2 operate as separate amplifiers. 1 Parallel Operation. OUT1 and OUT2 operate in parallel as a single amplifier. 0 Normal Operation 1 Auto-Shutdown Mode. Automatically disables the amplifiers when no analog input is detected. 0 Normal Operation 1 Auto-Shutdown Mode. Automatically disables the amplifiers when there is no I2S input. 0 ADC Trim Disabled 1 ADC Trim Enabled. Use ADC_COMP_COEFF_C0-C2 to trim ADC. 0 Normal Operation 1 Fault Conditions Disable the Amplifiers 0 Normal Operation 1 Pulse Correction Bypass. Amplifier output stages act as a buffer, passing PWM signal without correction to output. 0 Normal Operation 1 Short Amplifier Inputs. Sets amplifier outputs to 50% duty cycle, minimizing click and pop during power up/down. 0 Normal Operation 1 Output Short Circuit Protection Disabled 0 Normal Operation 1 Thermal Shutdown Disabled 0 Normal Operation 1 PMC uses PLL Source Clock 0 Normal Operation 1 Single Edge Modulation Mode PARALLEL 3 ZERO_ANA 4 ZERO_DIG 5 ADCTRIM 6 AUTO_SD 7 BYPASS_MOD 8 TST_SHT 9 SCKT_DIS 10 00 TSD_DIS 11 PMC_TEST 12 SE_MOD 33 www.ti.com LM48903 BIT NAME 23:13 UNUSED 24 I2C_ANA_LVL 31:25 UNUSED VALUE DESCRIPTION 0 External ADC Gain Control. ADC gain set by G0 and G1 1 Internal ADC Gain Control. ADC gain set by ANA_LVL. I2S PORT CONFIGURATION REGISTER (I2S PORT) (0x524h/0x525h) TABLE 24. I2S Port Configuration Register BIT NAME VALUE DESCRIPTION 0x524h 0 1 2 3 4 5 6 STEREO RX_ENABLE TX_ENABLE 0 Mono Mode 1 Stereo Mode 0 Receive Mode Disabled 1 Receive Mode Enabled 0 Transmit Mode Disabled 1 Transmit Mode Enabled 0 I2S Clock Slave. Device requires an external SCLK for proper operation. 1 I2S Clock Master. Device generates SCLK and transmits when either RX or TX mode are enabled. 0 I2S WS Slave. Device requires an external WS for proper operation. 1 I2S WS Master. Device generates WS and transmits when either RX or TX mode are enabled. 0 I2S Clock Phase. Transmit on falling edge, receive on rising edge. 1 PCM Clock Phase. Transmit on rising edge, receive on falling edge. 0 I2S Data Format: Left, Right 1 I2S Data Format: Right, Left CLK_MS SYNC_MS CLOCK_PHASE STEREO_SYNC _PHASE Mono 7 SYNC_MODE Rising edge indicates start of data word. 0 SYNC low = Left, SYNC high = Right 1 SYNC low = Right, SYNC high = left Configures the I2S port master clock half-cycle divider. Program the half-cycle divider by: (ReqDiv*2) 1 000000 13:8 15:14 www.ti.com HALF_CYCLE _DIVIDER BYPASS 000001 1 000010 1.5 000011 2 - - 111101 31 111110 31.5 111111 32 UNUSED 34 NAME VALUE LM48903 BIT DESCRIPTION Sets the Clock Generator Numerator 18:16 SYNTH_NUM 000 SYNTH_DENOM (1/) 001 100/SYNTH_DENOM 010 96/SYNTH_DENOM 011 80/SYNTH_DENOM 100 72/SYNTH_DENOM 101 64/SYNTH_DENOM 110 48/SYNTH_DENOM 111 19 SYNTH_DENOM 23:20 UNUSED 0/SYNTH_DENOM 0 Clock Generator Denominator = 128 1 Clock Generator Denominator = 125 Sets number of clock cycles before SYNC pattern repeats. MONO MODE 26:24 SYNC_RATE 000 8 001 12 010 16 011 18 100 20 101 24 110 25 111 32 STEREO MODE 000 16 001 24 010 32 011 36 100 40 101 48 110 50 111 64 Sets SYNC symbol width in Mono Mode 29:27 31:30 MONO_SYNC_WIDTH 000 1 001 2 010 4 011 7 100 8 101 11 110 15 111 16 UNUSED 0x525h 35 www.ti.com LM48903 BIT NAME VALUE DESCRIPTION Sets number of valid RECEIVE bits. 2:0 RX_WIDTH 000 24 001 20 010 18 011 16 100 14 101 13 110 12 111 8 Sets number of TRANSMIT bits. 5:3 TX_WIDTH 000 24 001 20 010 18 011 16 100 14 101 13 110 12 111 8 Sets number of pad bits after the valid Transmit bits. 00 7:6 8 www.ti.com TX_BIT RX_MODE 0 01 1 10 High-Z 11 High-Z 0 MSB Justified Receive Mode 1 LSB Justified Receive Mode 36 NAME VALUE DESCRIPTION MSB location from the frame start (MSB Justified) or LSB location from the frame end (LSB Justified) 13:9 RX_MSB_POSITION 00000 0 (DSP/PCM LONG) 00001 1 (I2S/PCM SHORT) 00010 2 00011 3 00100 4 00101 5 00110 6 00111 7 01000 8 01001 9 01010 10 01011 11 01100 12 01101 13 01110 14 01111 15 10000 16 10001 17 10010 18 10011 19 10100 20 10101 21 10110 22 10111 23 11000 24 11001 25 11010 26 11011 27 11100 28 11101 29 11110 30 11111 14 15 16 RX_COMPAND RX_A/µLAW TX_MODE 31 0 Normal Operation 1 Audio Data Companded 0 µLaw Compand Mode 1 A-Law Compand Mode 0 MSB Justified Transmit Mode 1 LSB Justified Transmit Mode 37 www.ti.com LM48903 BIT LM48903 BIT NAME VALUE DESCRIPTION MSB location from the frame start (MSB Justified) or LSB location from the frame end (LSB Justified) 21:17 TX_MSB_POSITION 00000 0 (DSP/PCM LONG) 00001 1 (I2S/PCM SHORT) 00010 2 00011 3 00100 4 00101 5 00110 6 00111 7 01000 8 01001 9 01010 10 01011 11 01100 12 01101 13 01110 14 01111 15 10000 16 10001 17 10010 18 10011 19 10100 20 10101 21 10110 22 10111 23 11000 24 11001 25 11010 26 11011 27 11100 28 11101 29 11110 30 11111 22 www.ti.com TX_COMPAND 23 TX_A/µLAW 31:24 UNUSED 31 0 Normal Operation 1 Audio Data Companded 0 µLaw Compand Mode 1 A-Law Compand Mode 38 LM48903 ADC TRIM COEFFICIENT REGISTER (ADC_TRIM) (0x526h/0x527) TABLE 25. ADC Trim Coefficient Register BIT NAME VALUE 15:0 ADC_COMP_COEFF_C0 31:16 ADC_COMP_COEFF_C1 DESCRIPTION 0x526h Sets ADC Trim Coefficient C0 Sets ADC Trim Coefficient C1 0x527h 15:0 ADC_COMP_COEFF_C2 31:16 UNUSED Sets ADC Trim Coefficient C2 READBACK REGISTER 0(READBACK0) (0x528h) READ-ONLY TABLE 26. Readback Register 0 BIT NAME VALUE DESCRIPTION 0 ADCR_CLIP 1 Right Channel ADC Input Clipped 1 ADCL_CLIP 1 Left Channel ADC Input Clipped 2 ADCR_LVLCLIP 1 Right Channel ADC Output Clipped 3 ADCL_LVLCLIP 1 Left Channel ADC Output Clipped 4 I2SR_LVLCLIP 1 Right Channel I2S Output Clipped 5 I2SL_LVLCLIP 1 Left Channel I2S Output Clipped 8 SHORT1 1 9 SHORT2 1 7:6 UNUSED OUT1 Output Short Circuit OUT2 Output Short Circuit 11:10 12 UNUSED THERMAL 23:13 SPARE 31:24 UNUSED 1 Thermal Shutdown Threshold Exceeded READBACK REGISTER 1(READBACK1) (0x528h) READ-ONLY TABLE 27. Readback Register 1 BIT 3.0 31:4 NAME CE_STATE VALUE DESCRIPTION 0000 Wait for supply 0001 Wait For I2C CLK REQ 0010 Enable I2C CLOCK 0011 Power up delay 0100 Standby 0101 Enable REF 0110 Enable Inputs 0111 Enable Outputs 1000 Unmute 1001 Enabled 1010 Off Deglitch 1011 Mute 1100 Disable Outputs 1101 Disable Inputs 1111 UNUSED UNUSED 39 www.ti.com LM48903 SYSTEM CONFIGURATION REGISTER (SYS_CONFIG) (0x530h) TABLE 28. System Configuration Register BIT NAME 6:0 DEVICE_ID 7 I2C_MCLK_REQ 8 USE_RAM 9 USE_I2C_ROM_SEL VALUE DESCRIPTION Sets LM48903 Device ID in slave mode. Default is 0x30h. 0 I2C does not require MCLK 1 I2C requires MCLK 0 Disable RAM Memory Usage 1 Enable RAM Memory Usage 0 MODE0, MODE1, Selects SPATIAL mode 1 I2C_SP_MD, Selects Spatial mode ROM mode spatial effects select. Selects which ROM page is loaded into coefficient memory. 11:10 I2C_SP_MD 22 UNUSED 23 W_CLE_EN 24 MBIST0_ENABLE 25 MBIST1_ENABLE 31:26 UNUSED 00 4.5cm speaker spacing 01 6cm speaker spacing 10 11.5cm speaker spacing 11 DSP bypassed, stereo mode 0 Write clock disabled 1 Write clock enabled 0 Memory BIST Controller 0 Disabled 1 Memory BIST Controller 0 Enabled. 0 Memory BIST Controller 1 Disabled 1 Memory BIST Controller 1 Enabled. SPEAKER OVERDRIVE CONTROL REGISTER (SPEAKER OVERDRIVE) (0x531h) TABLE 29. Speaker Overdrive Protection Register BIT NAME VALUE DESCRIPTION Window 1. Sets the sample window time the device uses to estimate audio energy for samples between LEVEL1 and LEVEL2 (0x532h) 3:0 W1 0000 5ms 0001 10ms 0010 20ms 0011 50ms 0100 100ms 0101 200ms 0110 500ms 0111 800ms 1000 1s 1001 2s 1010 5s 1011 10s 1100-1111 www.ti.com UNUSED 40 NAME VALUE DESCRIPTION Window 2. Sets the sample window time the device uses to estimate audio energy for samples above INT_TH1 (0x532h) 7:4 W2 0000 5ms 0001 10ms 0010 20ms 0011 50ms 0100 100ms 0101 200ms 0110 500ms 0111 800ms 1000 1s 1001 2s 1010 5s 1011 10s 1100-1111 UNUSED Attack Time Resolution 10:8 11 AT_RES 000 1ms 001 2ms 010 5ms 011 10ms 100 20ms 101 50ms 110 100ms 111 200ms UNUSED Release Time Resolution 14:12 15 RL_RES 000 1ms 001 2ms 010 5ms 011 10ms 100 20ms 101 50ms 110 100ms 111 200ms UNUSED Attack Mode Gain Reduction 19:16 AT_GAIN 000 0dB. No gain reduction 001 3dB — 3dB steps 110 18dB 111 21dB Maximum Gain 23:17 MAX_GAIN 000 0dB 001 3dB — 3dB steps 110 18dB 111 21dB 41 www.ti.com LM48903 BIT LM48903 BIT NAME VALUE DESCRIPTION Integrator Gain 26:24 27 INT_GAIN 000 0dB 001 6dB — 6dB steps 110 36dB 111 42dB UNUSED SODP Input Mode 29:28 30 31 SINP_MODE FS SODP_EN 00 No Signal Applied 01 OUT1 Input to SODP 10 OUT2 Input to SODP 11 Average (OUT1+OUT2/2) 0 48ksps 1 44.1ksps 0 Speaker Overdrive protection Disabled 1 Speaker Overdrive protection Enabled SPEAKER OVERDRIVE PROTECTION THRESHOLD REGISTER (SODP_THRESHOLD) (0x532h) TABLE 30. Filter Debug Register 1 BIT NAME VALUE DESCRIPTION LEVEL1 Output Level Threshold. Set LEVEL1 such that signals above LEVEL1 increase die temperature. Signal levels above LEVEL1 are added to the estimated audio energy in a given time window. 15:8 LEVEL2 Output Level Threshold. Set LEVEL2 such that signals below LEVEL2 reduce die temperature. Signal levels below LEVEL2 are subtracted from the estimated audio energy in a given time window. 23:16 INT_TH1 Attack Threshold. Integrator level above INT_TH1 enables the SOPD, reducing device gain. 31:24 INT_TH2 Release Threshold. Integrator level below INT_TH2 disables the SOPD, increasing device gain. 7:0 LOW POWER CONTROL REGISTER (0x533h) TABLE 31. Low Power Configuration Register BIT 0 NAME AUDET_EN VALUE DESCRIPTION 0 Disable Wake up On Audio Signal 1 Enable Wake up On Audio Signal Wake Up Detection Threshold 2:1 3 www.ti.com AUDET_LEVEL 00 25mV 01 50mV 10 75mV 11 100mV UNUSED 42 NAME VALUE LM48903 BIT DESCRIPTION Low Power Mode 5:4 7:6 LPWR_MODE 00 Normal Mode. No power saving modes enabled 01 Analog Audio Detect Mode. Input signal compared to AUDET_LEVEL. 10 ADC Audio Detect Mode 11 Digital Audio Detect Mod. Rising edge on I2S WS enables the device. UNUSED Time Out Delay. Delay time between no audio detected and the device entering low power mode. 11:8 TIMEOUT_DLY 0000 10ms 0001 20ms 0010 50ms 0011 100ms 0100 200ms 0101 500ms 0110 1s 0111 2s 1000 5s 1001 10s 1010 20s 1011 50s 1100 60s 1101 80s 1110 100s 1111 200s 23:12 ADC_TH ADC Audio Detection Threshold 24 OVR_OUT2_RST 1 Override OUT2 Reset 25 OVR_OUT1_RST 1 Override OUT1 Reset 26 OVR_OUT1_EN 1 Override OUT1 Enable 27 OVR_OUT2_EN 1 Override OUT2 Enable 28 OVR_VREF_EN 1 Override Reference Enable 29 OVR_PLL_EN 1 Override PLL Enable 30 OVR_ADCR_EN 1 Override Right Channel ADC Enable 31 OVR_ADCL_EN 1 Override Left Channel ADC Enable 43 www.ti.com LM48903 SYSTEM STATUS REGISTER (SYS_STAT) (0x538h) READ ONLY TABLE 32. MBIST Status Register BIT NAME VALUE 1:0 MBIST_DONE 3:2 MBIST_GO 5:4 MBIST_EN 8:6 UNUSED 9 DEV_EXISTS 10 BUS_ERR 11 CL_ACTIVE 16:12 UNUSED 31:16 MEM_ADDR DESCRIPTION Logic HIGH indicates memory test complete Logic Low indicates memory fault when MBIST_DONE is HIGH 0 MBIST Read-back Disabled 1 MBIST Read-back Enabled Logic HIGH indicates the presence of an EEPROM Logic HIGH indicates an I2C bus error during EEPROM read Logic HIGH indicates the I2C master is active and loading from the EEPROM Memory Address DEVICE ID REGISTER (0x539h) READ ONLY TABLE 33. Device ID Register BIT NAME VALUE 31:0 CHIP_ID 4890_3AA0h DESCRIPTION 32-bit Device ID SPEAKER OVERDRIVE PROTECTION DEBUG REGISTER (0x53Ah) READ ONLY TABLE 34. Speaker Overdrive Debug Register BIT NAME 23:0 SODP_INT 31:24 GAINED_INT_MAG VALUE DESCRIPTION Current Integrator Value Integrator Magnitude. 8 most significant bits of the integrator magnitude DEVICE ADDRESS The 0110000X is the defaultLM48903 I2C address hard coded into the device. An alternate device address can be programmed, via the SYS CONFIG (0x530h) Register. Use the default address during initial device configuration. www.ti.com 44 LM48903 GENERAL AMPLIFIER FUNCTION Class D Amplifier The LM48903 features stereo efficiency Class D audio power amplifiers that utilizes Texas Instruments’ filterless modulation scheme external component count, conserving board space and reducing system cost. The Class D outputs transition from VDD to GND with a 384kHz switching frequency. With no signal applied, the outputs switch with a 50% duty cycle, in phase, causing the two outputs to cancel. This cancellation results in no net voltage across the speaker, thus there is no current to the load in the idle state. With the input signal applied, the duty cycle (pulse width) of the LM48903 outputs changes. For increasing output voltage, the duty cycle of OUT_+ increases while the duty cycle of OUT_- decreases. For decreasing output voltages, the converse occurs. The difference between the two pulse widths yield the differential output voltage. Edge Rate Control (ERC) The LM48903 features Texas Instruments’ advanced edge rate control (ERC) that reduces EMI, while maintaining high quality audio reproduction and efficiency. The LM48903 ERC greatly reduces the high frequency components of the output square waves by controlling the output rise and fall times, slowing the transitions to reduce RF emissions, while maximizing THD+N and efficiency performance. The overall result of the E2S system is a filterless Class D amplifier that passes FCC Class B radiated emissions standards with 24in of twisted pair cable, with excellent 0.08% THD+N and high 91% efficiency. POWER DISSIPATION AND EFFICIENCY The major benefit of a Class D amplifier is increased efficiency versus a Class AB. The efficiency of the LM48903 is attributed to the region of operation of the transistors in the output stage. The Class D output stage acts as current steering switches, consuming negligible amounts of power compared to their Class AB counterparts. Most of the power loss associated with the output stage is due to the IR loss of the MOSFET on-resistance, along with switching losses due to gate charge. ANALOG INPUT The LM48903 features a stereo, 18-bit, differential ADC for systems without a digital audio source. The ADC front end includes a variable gain preamplifier with 4 gain settings, 0dB, 2.4dB, 3.5dB, and 6dB. The preamplifier gain is controlled by bits 0 and 1 (ANA_LVL) of the Analog Configuration Register (0x523h). The analog inputs can be configured as either differential or single ended inputs. The differential configuration SNR is 6dB higher than single-ended configuration. The differential input configuration also offers improved common mode rejection (CMRR). The increased CMRR reduces sensitivity to ground offset related noise injection. Configure the LM48903 for single-ended inputs as shown in Figure 10. The ADC input range is dependent on AVDD. The maximum input swing of each single ADC input, ie INL+, referenced to GND is 0.7*AVDD . This gives a maximum differential input of 7VP-P when AVDD = 5V. 301858g5 FIGURE 10. ADC Input Configurations 45 www.ti.com LM48903 POWER SUPPLY REQUIREMENTS At power up, sequence the LM48903 power supplies in the following order: 1) PVDD 2) AVDD/PLLVDD 3) DVDD/IOVDD Ensure PVDDis higher or equal to AVDD/PLLVDD, and PVDD is always higher than DVDD. MODULATOR POWER SUPPLY The AVDD1 powers the class D modulators. For maximum output swing, set AVDD1 and PVDD to the same voltage. Table 35 shows the output voltage for different AVDD1 levels. TABLE 35. Amplifier Output Voltage with variable AVDD1 Voltage www.ti.com AVDD1 (V) VOUT (VRMS) @PVDD = 5V, THD+N = 1% VOUT (VRMS) @PVDD = 3.6V, THD+N = 1% 5 3.3 — 4.5 3.1 — 4.2 2.9 — 4 2.7 — 3.6 2.5 2.4 3.3 2.3 2.2 3 2.1 2.1 2.8 1 1.9 46 In Parallel mode, channels OUT1 and OUT2 are driven from the same audio source, allowing the two channels to be connected in parallel, increasing output power to 3.3W into 4Ω at 10% THD+N. Set bit 2 (PARALLEL) of the Analog Configuration Register (0x532h) = 1 to configured the device in Parallel mode. After the device is set to Parallel mode, make an external connection between OUT1+ and OUT2+, and a connection between OUT1- and OUT2- Figure 11. In Parallel mode, the combined channels are driven from the OUT1 source. Signal routing, mixing, filtering, and equalization are done through the Spatial Engine. Make sure the device is configured in Parallel mode, before connecting OUT1 and OUT2 and enabling the outputs. Do not make a connection between OUT1 and OUT2 together while the outputs are enabled. Disable the outputs first, then make the connections between OUT1 and OUT2. 301858g2 FIGURE 11. Parallel Mode 47 www.ti.com LM48903 PARALLEL MODE LM48903 GAIN SETTING I2C Gain Setting The LM48903 has three gain stages, the ADC preamplifier, and two independent volume controls in the Digital Mixer, one for the ADC path and one for the I2S path. The ADC preamplifier has four gain settings (0dB, 2.4dB, 3.5dB, and 6dB). The preamplifier gain is set by bits 0 and 1 (ANA_LVL) of the Analog Configuration Register (0x523h). The Digital Mixer has two 64 step volume controls. The ADC path volume control is set by bits 5:0 (ADC_LVL) in the Digital Mixer Control Register (0x522h). The I2S path volume control is set by bits 13:8 (I2S_LVL) in the Digital Mixer Control Register (0x522h). Both volume controls have a range of -76.5dB to 18dB in 1.5dB increments. GAIN1 and GAIN0 Gain Setting For systems without I2C control, the ADC preamplifier gain is set by GAIN1 and GAIN0. The gain settings are shown in Table 36. The I2C preamplifier gain settings override GAIN1 and GAIN0. TABLE 36. Hardware Gain Setting GAIN1 GAIN0 GAIN (dB) 0 0 0 0 1 2.4 1 0 3.5 1 1 6 ROM MODE The LM48903 features a ROM with four preset operating modes; three spatial modes, and a stereo mode. The spatial modes are designed for three different speaker distances, 4.5cm, 6cm and 11.5cm. Due to the spatial processing, there may be a perceived Left/Right channel swap when switching between Stereo and the three preset spatial configurations in ROM mode. The ROM modes are selected through both the I2C interface and by MODE1/MODE0. For systems without I2C, MODE1 and MODE0 select the ROM mode as shown in Table 37. For systems with I2C, bits 11:10 (I2C_SP_MD1 and I2C_SP_MD0) of the SYS_CONFIG register (0x530h) select the ROM mode as shown in Table 38. Set bit 9 (USE_I2C_SP_MD) of the SYS_CONFIG register = 1 to select the ROM mode through I2C. Set bit 8 (USE_RAM) of the SYS_CONFIG register = 0 (default) to use the preset ROM modes. Set USE_RAM = 1 to use custom spatial coefficients. The LM48903 only accepts analog inputs in ROM mode, I2S inputs are ignored. TABLE 37. ROM Settings, Hardware Mode (USE_I2C_SP_MD = 0) MODE1 MODE0 DESCRIPTION 0 0 4.5cm Speaker Spacing 0 1 6cm Speaker Spacing 1 0 11.5 Speaker Spacing 1 1 DSP Bypassed, Stereo Mode TABLE 38. ROM Settings, I2C Mode (USE_I2C_SP_MD = 1) www.ti.com USE_RAM I2C_SP_MD1 I2C_SP_MD0 DESCRIPTION 0 0 0 4.5cm Speaker Spacing 0 0 1 6cm Speaker Spacing 0 1 0 11.5 Speaker Spacing 0 1 1 DSP Bypassed, Stereo Mode 1 X X Custom Spatial Mode. The device bypasses the ROM and loads coefficients from an external source. 48 Speaker overdrive protection (SODP) monitors the DSP outputs and adjusts the signal path gain to prevent speaker overheating. SODP monitors two levels, LEVEL1, the output amplitude above which the voice coil temperature rises, and LEVEL2 the output amplitude below which the voice coil temperature falls. Speaker Overdrive Protection Threshold Register (0x532h) bits 7:0 set LEVEL1. Bits 15:8 set LEVEL2. The difference between LEVEL1 and LEVEL2 is the amplitude where the voice coil temperature remains stable. The device integrates the difference between the output signal and LEVEL1 for signals above LEVEL1, and the difference between the output signal and LEVEL2 for signals below LEVEL2. There are two integration time windows. Bits 3:0, (W1), of the Speaker Overdrive Control Register (0x531h), set the duration of Window 1. Window 1 is integration time when during normal operation. Bits 7:4 (W2) set the duration of Window 2. Window 2 is the integration time when the SODP is active, and the device gain is reduced. At the end of Window 1, the device compares the integrator output the INT_TH1 (0x532h, bits 23:16), or the attack threshold. Bits 19:16, (AT_GAIN), of register 0x531h, set the gain reduction step. Bits 10:8 (AT_RES) set the attack time. For example, if AT_GAIN = 6dB and AT_RES = 5ms, once the integrator output exceeds INT_TH1, the signal path gain is reduced by 6dB in 1.5dB steps over 5ms. Following the gain reduction, the device switches to integrator Window 2. If the integrator output exceeds INT_TH1 again, the gain reduction is repeated until the integrator output no longer exceeds INT_TH1. The device remains in the reduced gain state until the integrator output falls below INT_TH2 (0x532h, bits 31:24), or the release threshold. Once the integrator output falls below INT_TH2, the device gain is increased to the original gain setting in 1.5dB steps. The release time set by bits 14:12 (RL_RES). Following the gain release, the device switches back to integrator Window 1. Set register 0x531h bit 21 (SODP_EN) = 1 to enable the speaker overdrive protection. DSP Output Selection The DSP outputs to the Digital Mixer can be selected from either of the two Array Filter signal paths. This allows the left and right inputs to be swapped or mixed before being output to the Class Ds. Filter Control Register (0x500h) bits 17:16 (CH1_SEL) the select the Array filter source for DSP1. Bits 19:18 (CH2_SEL) select the Array filter source for DSP2. Use channel routing to correct the perceived left/right channel swap that can occur with certain spatial configurations. Low Power Mode The LM48903 features three low power modes that enable and disable the device based on the presence of an input signal. Mode 1 monitors the ADC input signal. Mode 2 monitors the ADC output, and offers a faster wake up time (<10ms) compared to Mode 1. Mode 3 monitors the I2S interface and enables the device on the rising edge of WS. The low power mode is configured through the Low Power Control Register (0x533h) (Table 29). Bit 0 (AUDET_EN) enables the automatic signal detection. Bits 2:1 (AUDET_LEVEL) set the ADC input threshold. Bits 5:4 (LPWR_MODE) select the operating mode. Bits 11:8 (TIMEOUT_DLY) sets the delay time between loss of audio signal/WS clock to device disable. Bits 23:12 (ADC_TH) sets the ADC output threshold. 49 www.ti.com LM48903 SPEAKER OVERDRIVE PROTECTION LM48903 DIGITAL MIXER The digital mixer Figure 12 is responsible for routing the digital audio signals within the LM48903. The digital mixer is configured through the Digital Mixer register (0x522h). There are six inputs to the digital mixer, left and right ADC data, left and right I2S RX data, and two DSP output channels. ADC and I2S RX data can be routed to the DSP inputs (DSP_L and DSP_R), the class D amplifiers (OUT1-OUT2), and the I2S TX buses. The DSP output data can be routed to the class D amplifiers, and the I2S TX bus. The digital mixer includes independent digital gain blocks for the ADC and I2S RX data. The gain range is -76.5dB to 18dB in 1.5dB steps. The ADC gain is set by bits 5:0 (ADC_LVL) of the Digital Mixer Control Register (0x522h). The I2S gain is set by bits 13:8 (I2S_LVL) of the Digital Mixer Control Register. With a 0dBFS input and I2S_LVL = 110011 (0dB), the output voltage is 3.36VRMS. For additional output routing flexibility, use the digital mixer in conjunction with the Array filter channel routing. The Array filter channel routing control selects which filter channel is output on each DSP output. The DSP must be active to use the Array filter channel routing, however, no coefficients are required. With no spatial effect, Array filter channel contains left channel audio data, channel contains right channel audio data. The Array filter channel routing is controlled by bits 19:16 in the Filter Control Register (0X500h). See DSP Output Selection section. 301858g3 FIGURE 12. Digital Mixer www.ti.com 50 The LM48903 Spatial Engine is a specialized DSP that is optimized for TI’s proprietary spatial audio algorithm. The Spatial Engine consists of two processing stages, the Pre Filter and Array Filter (Figure 14). The filters perform different portions of the spatial processing, and are configured and controlled independent of each other. The Pre Filter uses virtual speaker positioning to set the width of the sound stage. The Array Filter is responsible for equalization and positioning the audio content within the virtual sound stage created by the Pre Filter. 301858f9 FIGURE 13. DSP Routing 51 www.ti.com LM48903 SPATIAL ENGINE (DSP) LM48903 Filter Enable and Filter Bypass The Pre Filter and Array Filter are enabled independently. Filter Control Register (0x500h) bit 30 (PRE_ENABLE) enables the Pre Filter, bit 31 (ARRAY_ENABLE) enables the Array Filter. The independent filter enables maximize power savings when only a portion of the LM48903’s DSP processing is required. The filter bypass allows audio data to pass through the DSP without any processing. The Pre Filter and Array Filter can be independently bypassed. Filter Control Register (0x500h) bit 28 (PRE_BYPASS) bypasses the Pre Filter, bit 29 (ARRAY_BYPASS) bypasses the Array Filter. When using a portion of the DSP path, bypass the filter that is not in use. Audio data will not pass through the disabled filter. For example, if the Pre Filter is disabled while the Array Filter is enabled, bypass the Pre Filter. Compressor The Pre filter and Array filter each have a compressor that monitors the filter output and maintains the amplitude below the set threshold (Figure 15). The compressors have four user configurable settings, compressor threshold (COMP_TH), pre-compression gain (G1_GAIN), compression ratio (COMP_RATIO), and post compression gain (POST_GAIN). COMP_TH sets the threshold above which the compression is applied to the filter output signal. G1_GAIN sets the gain applied before compression. COMP_RATIO sets the linear compression ratio applied to the filter output signal. POST_GAIN sets the post compression gain, increasing the compressor output signal when either COMP_TH is low or COMP_RATIO is high. Compressor Control Register 1 (0x501h) configures the Pre Filter compressor. Bits 4:0 (COMP_TH) set the Pre Filter compressor threshold. Bits 7:5 (G1_GAIN set the Pre Filter pre-compression gain. Bits 10:8 (COMP_RATIO) set the Pre Filter compression ratio. Bits 14:12 (POST_GAIN) set the post compression gain. The Array Filter outputs can be routed through one of two compressors, allowing different signal paths to have different compression profiles. This feature is useful if the LM48903 outputs are driving different speakers, for example, two tweeters and two subwoofers. One compression profile is applied to the tweeter channels, while the second compression profile is applied to the subwoofer channels. Bits 19:16 of Compressor Control Register 1 and Compressor Control Register 2 (0x502h) configure the Array Filter. Bits 14:0 of the Compressor Control Register 2 configure the Array Filter compressor 0. Bits 30:16 configure the Array Filter compressor 1. The Compressor Control Register 1 bits 17:16 (ARRAY_COMP_SELECT) selects the compressor setting used by each Array Filter channel. Bit 16 controls DSP channel 1, bit 17 controls DSP channel 2. Set the desired channel ARRAY_COMP_SELECT bit = 0 to select compressor 0, set the desired channel ARRAY_COMP_SELECT bit = 1 to select compressor 1. 301858g7 FIGURE 14. DSP Core Diagram www.ti.com 52 LM48903 DSP Output Selection CLOCK REQUIREMENTS The LM48903 requires an external clock source for proper operation, regardless of input source or device configuration. The device derives the ADC, digital mixer, DSP, I2S port, and PWM clocks from the external clock. The clock can be derived from either MCLK or SCLK inputs. Set bit 11 (I2S_CLK) of the Enable and Clock configuration register (0x521h) to 0 to select MCLK, set I2S_CLK to 1 to select SCLK. The LM48903 accepts five different clock frequencies, 1.536, 3.072, 6.114, 12.288, and 24.576MHz. Set bits 10:8 (MCLK_RATE) of the Enable and Clock Configuration Register to the appropriate clock frequency. In systems where both MCLK and SCLK are available, choose the lower frequency clock for improved power consumption. SHUTDOWN FUNCTION There are two ways to shutdown the LM48903, hardware mode, and software mode. The default is hardware mode. Set bit 1 (FORCE) of the Enable and Clock Configuration Register (0x521h) to 0 to enable hardware shutdown mode. In hardware mode, the device is enabled and disabled through SHDN. Connect SHDN to VDD for normal operation. Connect SHDN to GND to disable the device. Hardware shutdown mode supports a one shot, or momentary switch SHDN input. When bit 2 (PULSE) of the Enable and Clock Configuration Register (0x521h) is set to 1, the LM48903 responds to a rising edge on SHDN to change the device state. When PULSE = 0, the device requires a stable logic level on SHDN. Set FORCE = 1 to enable software shutdown mode. In software shutdown mode, the device is enabled and disabled through bit 0 (ENABLE) of the Enable and Clock Configuration Register (0x512h). Set ENABLE = 0 to disable the LM48903. Set ENABLE = 1 to enable the LM48903. In either hardware or software mode, the content of the LM48903 memory registers is retained after the device is disabled, as long as power is still applied to the device. Minimize power consumption by disabling the PMC clock oscillator when the LM48903 is shutdown. Set bit 12 (PMC_CLK_SEL) and bit 14 (QSA_CLK_STOP) of the Enable and Clock configuration Register (0x521h) = 1 to disable the PMC clock oscillator. EXTERNAL CAPACITOR SELECTION Power Supply Bypassing and Filtering Proper power supply bypassing is critical for low noise performance and high PSRR. Place the supply bypass capacitors as close to the device as possible. Typical applications employ a voltage regulator with 10μF and 0.1μF bypass capacitors that increase supply stability. These capacitors do not eliminate the need for bypassing of the LM48903 supply pins. A 1μF capacitor is recommended for IOVDD, PLLVDD, DVDD, and AVDD. A 2.2μF capacitor is recommended for PVDD. REF and BYPASS Capacitor Selection For best performance, bypass REF with a 4.7μF ceramic capacitor. 53 www.ti.com LM48903 INPUT CAPACITOR SELECTION The LM48903 analog inputs require input coupling capacitors. Input capacitors block the DC component of the audio signal, eliminating any conflict between the DC component of the audio source and the bias voltage of the LM48903. The input capacitors create a high-pass filter with the input resistors RIN. The -3dB point of the high pass filter is found using Equation (1) below. f = 1 / 2πRINCIN Where the value of RIN is 20kΩ. The input capacitors can also be used to remove low frequency content from the audio signal. Small speakers cannot reproduce, and may even be damaged by low frequencies. High pass filtering the audio signal helps protect the speakers. When the LM48903 is using a single-ended source, power supply noise on the ground is seen as an input signal. Setting the high-pass filter point above the power supply noise frequencies, 217Hz in a GSM phone, for example, filters out the noise such that it is not amplified and heard on the output. Capacitors with a tolerance of 10% or better are recommended for impedance matching and improved CMRR and PSRR. PCB LAYOUT GUIDELINES As output power increases, interconnect resistance (PCB traces and wires) between the amplifier, load, and power supply create a voltage drop. The voltage loss due to the traces between the LM48903 and the load results in lower output power and decreased efficiency. Higher trace resistance between the supply and the LM48903 has the same effect as a poorly regulated supply, increasing ripple on the supply line, and reducing peak output power. The effects of residual trace resistance increases as output current increases due to higher output power, decreased load impedance or both. To maintain the highest output voltage swing and corresponding peak output power, the PCB traces that connect the output pins to the load and the supply pins to the power supply should be as wide as possible to minimize trace resistance. The use of power and ground planes will give the best THD+N performance. In addition to reducing trace resistance, the use of power planes creates parasitic capacitors that help to filter the power supply line. The inductive nature of the transducer load can also result in overshoot on one of both edges, clamped by the parasitic diodes to GND and VDD in each case. From an EMI standpoint, this is an aggressive waveform that can radiate or conduct to other components in the system and cause interference. In is essential to keep the power and output traces short and well shielded if possible. Use of ground planes beads and micros-strip layout techniques are all useful in preventing unwanted interference. As the distance from the LM48903 and the speaker increases, the amount of EMI radiation increases due to the output wires or traces acting as antennas become more efficient with length. Ferrite chip inductors places close to the LM48903 outputs may be needed to reduce EMI radiation. www.ti.com 54 LM48903 Revision History Rev Date 1.0 04/12/12 Description Initial WEB released. 55 www.ti.com LM48903 Physical Dimensions inches (millimeters) unless otherwise noted 30–pin micro SMD Order NumberLM48903TL NS Package Number TLA30HHA X1 = 2670±0.03mm X2 = 3179±0.03mm X3 = 0.6±0.075mm www.ti.com 56 LM48903 Notes 57 www.ti.com LM48903 Stereo Class D Spatial Array Notes www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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