TDA7315 DIGITAL CONTROLLED AUDIO PROCESSOR 1 STEREO INPUT LOUDNESS FUNCTION VOLUME CONTROL IN 1.25dB STEPS TREBLE AND BASS CONTROL TWO SPEAKERS ATTENUATORS: - INDEPENDENT SPEAKERS CONTROL IN 1.25dB STEPS - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SERIAL BUS DESCRIPTION The TDA7315 is a volume, tone (bass and treble) balance (Left/Right) processor for quality audio applications in car radio and Hi-Fi systems. Control is accomplished by serial bus microprocessor interface. The AC signal settingis obtainedby resistor networks SO20 DIP 20 ORDERING NUMBER: TDA7315 (DIP 20) TDA7315D (SO 20) and switches combined with operational amplifiers. Thanks to the used BIPOLAR/CMOS Technology, Low Distortion, Low Noise and DC stepping are obtained. BLOCK DIAGRAM July 1998 1/12 TDA7315 PIN CONNECTION (Top view) THERMAL DATA Symbol Parameter R th j-pins Thermal Resistance Junction-pins Max. SO 20 DIP 20 Unit 150 150 °C/W ABSOLUTE MAXIMUM RATINGS Symbol VS Parameter Operating Supply Voltage T amb Operating Ambient Temperature Tstg Storage Temperature Range Value Unit 10.2 V -10 to 85 °C -55 to +150 °C QUICK REFERENCE DATA Symbol Min. Typ. Max. VS Supply Voltage Parameter 6 9 10 VCL Max. input signal handling 2 THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 S/N Signal to Noise Ratio 106 SC Channel Separation f = 1KHz 103 Volume Control 1.25dB step Bass and Treble Control Balance Control Mute Attenuation 2/12 2db step 1.25dB step Unit V Vrms 0.1 % dB dB -78.75 0 dB -14 +14 dB -38.75 0 100 dB dB TDA7315 TEST CIRCUIT ELECTRICAL CHARACTERISTICS (refer to the test circuit Tamb = 25°C, VS = 9V, RL = 10KΩ, RG = 600Ω, all controls flat (G = 0), f = 1KHz unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit SUPPLY VS Supply Voltage IS SVR Supply Current Ripple Rejection 6 9 10 V 11 60 8 80 mA dB VOLUME CONTROL R IV Input Resistance 20 33 50 kΩ C RANGE AVMIN AVMAX Control Range Min. Attenuation Max. Attenuation 70 -1 70 75 0 75 80 1 80 dB dB dB 0.5 -1.25 -3 1.25 0 1.75 1.25 2 2 3 7.5 dB dB dB dB mV mV 40 1.75 1.5 dB dB dB ASTEP EA ET VDC Step Resolution Attenuation Set Error Tracking Error DC Steps Av = 0 to -20dB Av = -20 to -60dB adjacent attenuation steps From 0dB to Av max 0 0.5 SPEAKER ATTENUATORS Crange SSTEP EA Control Range Step Resolution Attenuation set error AMUTE VDC Output Mute Attenuation DC Steps 35 0.5 37.5 1.25 80 100 0 1 3 10 dB mV mV +12 1 +14 2 +16 3 dB dB 34 44 58 KΩ adjacent att. steps from 0 to mute BASS CONTROL (1) Gb BSTEP RB Control Range Step Resolution Internal Feedback Resistance Max. Boost/cut 3/12 TDA7315 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit +13 +14 +15 dB 1 2 3 dB 2 2.5 TREBLE CONTROL (1) Gt TSTEP Control Range Max. Boost/cut Step Resolution AUDIO OUTPUTS VOCL Clipping Level RL Output Load Resistance CL Output Load Capacitance d = 0.3% Vrms 2 KΩ 10 nF ROUT Output resistance 30 75 120 Ω VOUT DC Voltage Level 4.2 4.5 4.8 V 2.5 5 15 µV µV GENERAL e NO Output Noise BW = 20-20KHz, flat output muted all gains = 0dB 3 µV Signal to Noise Ratio all gains = 0dB; VO = 1Vrms 106 dB d Distortion AV = 0, VIN = 1Vrms AV = -20dB VIN = 1Vrms V IN = 0.3Vrms 0.01 0.09 0.04 Sc Channel Separation left/right A curve all gains = 0dB S/N Total Tracking error 80 AV = 0 to -20dB -20 to -60 dB 0.1 0.3 103 0 0 % % % dB 1 2 dB dB 1 V +5 µA 0.4 V BUS INPUTS V IL Input Low Voltage VIH Input High Voltage 3 IIN Input Current -5 VO Output Voltage SDA Acknowledge IO = 1.6mA V Note: (1) Bass and Treble response see attached diagram (fig.19). The center frequency and quality of the resonance behaviour can be choosen by the external circuitry. A standard first order bass response can be realized by a standard feedback network. Figure 1: Loudness versus Volume Attenuation 4/12 Figure 2: Loudnessversus Frequency TDA7315 Figure 3: Loudness versus External Capacitors LOUDNESS VS = 9V Volume = -40dB All other control flat C in = 2.2µF C loud = 220nF, 100nF, 33nF, 10nF, Open, Shorter to Vref Figure 4: Noise vs. Volume/Gain Settings Figure 6: Distortion & Noise vs. Frequency Figure 5: Signal to Noise Ratio vs. Volume Setting Figure 7: Distortion & Noise vs. Frequency Figure 8: Distortion vs. Load Resistance 5/12 TDA7315 Figure 9: Channel Separation (L → R) vs. Frequency Figure 10: Supply Voltage Rejection vs. Frequency Figure 11: Output Clipping Level vs. Supply Voltage Figure 12: Quiescent Current vs. Supply Voltage Figure 13: Supply Current vs. Temperature Figure 14: Bass Resistance vs. Temperature 6/12 TDA7315 Figure 15: Typical Tone Response (with the ext. components indicated in the test circuit) SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: A start condition (S) A chip address byte, containing the TDA7315 address (the 8th bit of the byte must be 0). The TDA7315 must always acknowledge at the end of each transmitted byte. A sequence of data (N-bytes + acknowledge) A stop condition (P) TDA7315 ADDRESS S MSB first byte 1 0 0 0 LSB 0 0 0 MSB LSB DATA 0 ACK MSB LSB DATA ACK ACK P Data Transferred (N-bytes + Acknowledge) ACK = Acknowledge S = Start P = Stop MAX CLOCK SPEED 100kbits/s SOFTWARE SPECIFICATION Chip address = 80 Hex 1 MSB 0 0 0 0 0 0 0 LSB DATA BYTES MSB 0 1 1 0 0 0 LSB 0 0 0 1 1 1 B2 0 1 0 1 1 B1 B1 B1 X 0 1 B0 B0 B0 X C3 C3 A2 A2 A2 L C2 C2 A1 A1 A1 X C1 C1 A0 A0 A0 X C0 C0 FUNCTION Volume control Speaker ATT L Speaker ATT R Loudness Bass control Treble control Ax = 1.25dB steps; Bx = 10dB steps; Cx = 2dB steps; X = don‘t care. 7/12 TDA7315 SOFTWARE SPECIFICATION (continued) DATA BYTES (detailed description) Volume MSB 0 0 LSB 0 0 B2 B1 B0 B2 B1 B0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 A2 A1 A0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 A2 A1 A0 FUNCTION Volume 1.25dB steps 0 -1.25 -2.5 -3.75 -5 -6.25 -7.5 -8.75 Volume 10dB steps 0 -10 -20 -30 -40 -50 -60 -70 For example a volume of -45dB is given by: 0 0 1 0 0 1 0 0 Speaker Attenuators MSB 1 1 LSB 0 0 0 1 B1 B1 B0 B0 0 0 1 1 0 1 0 1 1 1 A2 A2 A1 A1 A0 A0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -1.25 -2.5 -3.75 -5 -6.25 -7.5 -8.75 0 -10 -20 -30 1 For example attenuation of 25dB on speaker R is given by: 1 0 1 1 0 1 0 0 8/12 FUNCTION Speaker L Speaker R 1 1 Mute TDA7315 Loudness MSB 0 LSB 1 0 X X L X FUNCTION X 0 1 LOUDNESS ON LOUDNESS OFF x = don‘t care For examples Loudness Off can be programmed by the following 8 bit string: 0 1 0 0 0 1 0 0 Bass and Treble 0 0 1 1 1 1 0 1 C3 C3 C2 C2 0 0 0 0 1 1 1 1 C1 C1 0 0 1 1 0 0 1 1 C0 C0 0 1 0 1 0 1 0 1 Bass Treble -14 -12 -10 -8 -6 -4 -2 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 0 2 4 6 8 10 12 14 C3 = Sign For example Bass at -10dB is obtained by the following 8 bit string: 0 1 1 0 0 0 1 0 9/12 TDA7315 SO20 PACKAGE MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. MIN. TYP. MAX. A 2.35 2.65 0.093 0.104 A1 0.1 0.3 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.6 13 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 K 0 (min.)8 (max.) L h x 45° A B e A1 K H D 20 11 E 1 10 SO20MEC 10/12 C TDA7315 DIP20 PACKAGE MECHANICAL DATA mm DIM. MIN. a1 0.254 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.010 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 D 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.280 I 3.93 0.155 L Z 3.3 0.130 1.34 0.053 11/12 TDA7315 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1998 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 12/12