7314

TDA7314 STMICROELECTRONICS | Alldatasheet

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DIGITAL CONTROLLED AUDIO PROCESSOR WITH LOUDNESS

1 STEREO INPUT

SELECTABLE INPUT GAIN FOR OPTIMAL ADAPTION TO DIFFERENT SOURCES INPUT AND OUTPUT FOR EXTERNAL EQUALIZER OR NOISE REDUCTION SYS- TEM LOUDNESS FUNCTION VOLUME CONTROL IN 1.25dB STEPS TREBLE AND BASS CONTROL FOUR SPEAKER ATTENUATORS: - 4 INDEPENDENT SPEAKERS CONTROL IN 1.25dB STEPS FOR BALANCE AND FADER FACILITIES - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SE- RIAL BUS

DESCRIPTION

The TDA7314 is a volume, tone (bass and treble) balance (Left/Right) and fader (front/rear) processor for quality audio applications in car radio and Hi-Fi systems. Selectable input gain and internal loudness function are provided. Control is accomplished by serial bus microprocessorinterface. The AC signal setting is obtained by resistor networks andswitches combinedwith operationalamplifiers. Thanks to the used BIPOLAR/CMOS Tecnology, Low Distortion, Low Noise and DC stepping are ob- tained. November 1999 SDIP24 ORDERING NUMBER: TDA7314 PIN CONNECTION (Top view)

Symbol Description Value Unit R th j-pins Thermal Resistance Junction-pins Max. 65 °C/W QUICK REFERENCE DATA Symbol Parameter Min. Typ. Max. Unit VS Supply Voltage 6 9 10 V VCL Max. input signal handling 2 Vrms THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 0.1 % S/N Signal to Noise Ratio 106 dB S C Channel Separation f = 1KHz 103 dB Volume Control 1.25dB step -78.75 0 dB Bass and Treble Control 2db step -14 +14 dB Fader and Balance Control 1.25dB step -38.75 0 dB Input Gain 6.25dB step 0 18.75 dB Mute Attenuation 100 dB ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Operating Supply Voltage 10.2 V Tamb Operating Ambient Temperature -40 to 85 °C Tstg Storage Temperature Range -55 to +150 °C TEST CIRCUIT TDA7314

ELECTRICAL CHARACTERISTICS (refer to the test circuit Tamb =2 5°C, VS = 9V, RL = 10KΩ ,R G = 600Ω , all controls flat (G = 0), f = 1KHz unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit SUPPLY VS Supply Voltage 6 9 10 V IS Supply Current 8 11 mA SVR Ripple Rejection 60 80 dB INPUT STAGE R II Input Resistance Pin 9, 11 35 50 70 K Ω V CL Clipping Level 2 2.5 Vrms R L Output Load resistance pin 7, 17 2 K Ω G INmin Min. Input Gain -1 0 1 dB G INmax Max. Input Gain 18.75 dB G STEP Step Resolution 6.25 dB eIN Input Noise G = 18.75dB 2 µV VDC DC Steps adjacent gain steps 4 20 mV G = 18.75 to Mute 4 mV VOLUME CONTROL R IV Input Resistance 20 33 50 k Ω C RANGE Control Range 70 75 80 dB AVMIN Min. Attenuation -1 0 1 dB AVMAX Max. Attenuation 70 75 80 dB ASTEP Step Resolution 0.5 1.25 1.75 dB EA Attenuation Set Error Av = 0 to -20dB Av = -20 to -60dB -1.25 0 1.25 dB dB E T Tracking Error 2d B VDC DC Steps adjacent attenuation steps From 0dB to Av max 0.5 7.5 mV mV SPEAKER ATTENUATORS C range Control Range 35 37.5 40 dB SSTEP Step Resolution 0.5 1.25 1.75 dB EA Attenuation set error 1.5 dB AMUTE Output Mute Attenuation 80 100 dB VDC DC Steps adjacent att. steps from 0 to mute mV mV BASS CONTROL (1) Gb Control Range Max. Boost/cut +12 +14 +16 dB BSTEP Step Resolution 1 2 3 dB R B Internal Feedback Resistance 34 44 58 K Ω TREBLE CONTROL (1) Gt Control Range Max. Boost/cut +13 +14 +15 dB TSTEP Step Resolution 1 2 3 dB TDA7314

ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit AUDIO OUTPUTS VOCL Clipping Level d = 0.3% 2 2.5 Vrms R L Output Load Resistance 2 K Ω C L Output Load Capacitance 10 nF R OUT Output resistance 30 75 120 Ω VOUT DC Voltage Level 4.2 4.5 4.8 V GENERAL eNO Output Noise BW = 20-20KHz, flat output muted all gains = 0dB 2.5 51 5 µV µV A curve all gains = 0dB 3 µV S/N Signal to Noise Ratio all gains = 0dB; V O = 1Vrms 106 dB d Distortion A V =0 ,VIN = 1Vrms AV = -20dB VIN = 1Vrms V IN = 0.3Vrms 0.01 0.09 0.04 0.1 0.3 Sc Channel Separation left/right 80 103 dB Total Tracking error A V = 0 to -20dB -20 to -60 dB dB dB BUS INPUTS V IL Input Low Voltage 1V VIH Input High Voltage 3 V IIN Input Current -5 +5 µA VO Output Voltage SDA Acknowledge IO = 1.6mA 0.4 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 Figure 2:Loudnessversus Frequency (CLOUD = 100nF) TDA7314

The interface protocol comprises: A start condition (S) A chip address byte, containing the TDA7314 address (the 8th bit of the byte must be 0). The TDA7314 must always acknowledge at the end of each transmitted byte. A sequenceof data (N-bytes + acknowledge) A stop condition (P) TDA7314 ADDRESS MSB first byte LSB MSB LSB MSB LSB S10001000 ACK DATA ACK DATA ACK P Data Transferred (N-bytes + Acknowledge) ACK = Acknowledge S = Start P = Stop MAX CLOCK SPEED 100kbits/s SOFTWARE SPECIFICATION Chip address MSB 0001000 LSB DATA BYTES MSB LSB FUNCTION Volume control Speaker ATT LR Speaker ATT RR Speaker ATT LF Speaker ATT RF Audio switch Bass control Treble control Ax = 1.25dB steps; Bx = 10dB steps; Cx = 2dB steps; Gx = 6.25dB steps Figure 15:Typical Tone Response (with the ext. components indicated in the test circuit) TDA7314

SOFTWARE SPECIFICATION (continued) DATA BYTES (detailed description) Volume MSB LSB FUNCTION 0 0 B2 B1 B0 A2 A1 A0 Volume 1.25dB steps -1.25 -2.5 -3.75 -6.25 -7.5 -8.75 0 0 B2 B1 B0 A2 A1 A0 Volume 10dB steps -10 -20 -30 -40 -50 -60 -70 For example a volume of -45dB is given by: 00100100 Speaker Attenuators MSB LSB FUNCTION Speaker LF Speaker RF Speaker LR Speaker RR -1.25 -2.5 -3.75 -6.25 -7.5 -8.75 -10 -20 -30

11111 Mute

For example attenuation of 25dB on speaker RF is given by: 10110100 TDA7314

0 1 0 G1 G0 S2 S1 S0 Audio Switch Stereo 1 Stereo 2 (MUTE) (*) Stereo 3 (MUTE) (*) Stereo 4 (MUTE) (*) LOUDNESS ON LOUDNESS OFF +18.75dB +12.5dB +6.25dB 0dB For example to select the stereo 1 input with a gain of +12.5dB, loudness on, the 8 bit string is: 01001000 (*) Stereo 2, 3, 4 are connected internally but not available on pins. Bass and Treble Bass Treble -14 -12 -10 C3 = Sign For example Bass at -10dB is obtained by the following 8 bit string: 01100010 TDA7314

DIM. mm inch A 5.08 0.20 A1 0.51 0.020 E 7.62 8.64 0.30 0.340 e 1.778 0.070 e1 7.62 0.30 e2 10.92 0.430 e3 1.52 0.060 SDIP24 (0.300”) Stand-off Be B1 D F LA c E Gage Plane .015 0,38 E SDIP24 OUTLINE AND MECHANICAL DATA TDA7314

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  1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com TDA7314