AP2600 4-Channel Audio Process AP2600 \ 4-Channel Audio Processor AP2600 4-Channel Audio Process Table of Contents 1. OVERVIEW ......................................................................................................... 1 2. APPLICATIONS .................................................................................................. 1 3. ORDERING INFORMATION ............................................................................... 1 4. FEATURES.......................................................................................................... 1 5. BLOCK DIAGRAM.............................................................................................. 1 6. PIN CONFIGURATION........................................................................................ 2 7. DEVICE PIN OUT AND PIN DESCRIPTIONS .................................................... 2 8. APPLICATION CIRCUIT ..................................................................................... 3 9. ABSOLUTE MAXIMUM RATING (Ta = 25oC) ..................................................... 3 10. ELECTRICAL CHARACTERISTICS................................................................... 4 11. EQUALIZER DESCRIPTION .............................................................................. 7 12. I2C-BUS CONCEPTS .......................................................................................... 9 13. I2C-BUS FORMAT ............................................................................................. 10 14. DATA BYTE FUNCTION & POWER ON RESET CONDITION......................... 10 15. SOFTWARE SPECIFICATION...........................................................................11 16. PACKAGE INFORMATION ............................................................................... 14 AP2600 4-Channel Audio Process 1. OVERVIEW 4. FEATURES The AP2600 is a four-channel input audio processor with input multiplexer, input volume attenuator, equalizer and loudness features. It can effectively suppress noise with very few external components. AP2600’s built-in zero-cross function can effectively prevent click noise. This chip is controlled by serial data I2C bus which makes the chip user-friendly by simple command. 2. APPLICATIONS Boombox Mini Stereo System MP3 Docking Speaker System Discman Portable Audio System 3. ORDERING INFORMATION PART NUMBER PINS PACKAGE AP2600-CB-L 28 COB AP2600-SO-L 28 SOP 4 stereo input selectors Input volume attenuator (64 steps): master control in 1.25dB steps Two output speaker attenuators (32 steps): balance controls in 1.25dB steps Loudness function on/off Treble and Bass control in 2dB step (15 steps) Few external components Built-in zero-cross detector prevents click noise No DC level shift Gain control in 3.75dB step (4 steps) Separate outputs: line out, speaker out Built-in power-up reset Controlled by serial data I2C bus Separate ground for analog and digital circuits 2.7V to 5.5V single supply operation 12 C H 1L C H 2L C H 3L C H 4L 3 16 15 14 13 L 19 LVOLI LM AXO B IN L 20 TR EBLE M U LTIPLEXER + VOLU M E + LOU DN ESS C H 1R C H 2R C H 3R C H 4R B OU TL TREL LOU DL 5. BLOCK DIAGRAM 17 18 GA IN + SPR ATT LEFT BASS 24 27 26 2 I C BUS D ECODER + LATC HES 11 10 9 8 R TR EBLE 25 GA IN + SPR ATT RIGHT BASS 23 LOU T SC L SD A GN D R OU T SUPPLY 7 2 28 4 22 6 5 R VOLI R M AXO B OUTR Page 1 of 16 21 B IN R TRER VREF VSA VDA LOU DR Revision 1.2 1 March 26, 2007 AP2600 4-Channel Audio Process 6. PIN CONFIGURATION VDA 1 28 VREF VDA 1 28 VREF VSA 2 27 SCL VSA 2 27 SCL TREL 3 26 SDA TREL 3 26 SDA TRER 4 25 GND TRER 4 25 GND RVOLI 5 24 LOUT RVOLI 5 24 LOUT RMAXO 6 23 ROUT RMAXO 6 23 ROUT LOUDR 7 22 BOUTR LOUDR 7 22 BOUTR CH4R 8 21 BINR CH4R 8 21 BINR CH3R 9 20 BOUTL CH3R 9 20 BOUTL BINL CH2R 10 19 BINL AP2600 COB CH2R 10 19 CH1R 11 18 LMAXO LOUDL 12 17 LVOLI CH4L 13 16 CH1L CH3L 14 15 CH2L AP2600 SOP CH1R 11 18 LMAXO LOUDL 12 17 LVOLI CH4L 13 16 CH1L CH3L 14 15 CH2L 7. DEVICE PIN OUT AND PIN DESCRIPTIONS PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Revision 1.2 PIN NAME VDA VSA TREL TRER RVOLI RMAXO LOUDR CH4R CH3R CH2R CH1R LOUDL CH4L CH3L CH2L CH1L LVOLI LMAXO BINL BOUTL BINR BOUTR ROUT LOUT GND SDA SCL VREF DESCRIPTIONS Power Supply Voltage Input Analog Ground Left Channel Treble Band Right Channel Treble Band Right Channel Volume Control Input Right Channel Maximum Output Right Channel Loudness Right Channel Audio Input for Stereo Input Channel 4 Right Channel Audio Input for Stereo Input Channel 3 Right Channel Audio Input for Stereo Input Channel 2 Right Channel Audio Input for Stereo Input Channel 1 Left Channel Loudness Left Channel Audio Input for Stereo Input Channel 4 Left Channel Audio Input for Stereo Input Channel 3 Left Channel Audio Input for Stereo Input Channel 2 Left Channel Audio Input for Stereo Input Channel 1 Left Channel Volume Control Input Left Channel Maximum Output Bass Band Left Channel Input Bass Band Left Channel Output Bass Band Right Channel Input Bass Band Right Channel Output Right Channel Audio Output for Speaker Use Left Channel Audio Output for Speaker Use Digital Ground Serial Data Line Serial Clock Line Reference Voltage Input Page 2 of 16 March 26, 2007 AP2600 4-Channel Audio Process I2C BUS 8. APPLICATION CIRCUIT R1 R2 5.6K 5.6K C26 10U C23 C1 16 15 CH2L 17 CH3L 18 CH1L 19 CH4L 20 10U 10U LVOLI ROUT 0.1U LOUDL 21 0.1U 10U LMAXO 22 0.1U C2 C8 CH1R 23 LOUT SCL 24 0.1U C18 BINL 25 GND 26 SDA 27 VREF 28 10U C17 BINR 10U C7 CH2R C6 BOUTL C22 BOUTR C11 10U VDA VSA TREL TRER RVOLI RMAXO LOUDR CH4R CH3R ASP AP680 AP2600 1 2 3 4 5 6 7 8 9 C24 13 14 10U C15 C16 10U C20 2.7N C14 10U C13 10U C12 10U C4 C3 10U 10U 10U 10U R4 R3 470K 0.1U 12 C19 2.7N C25 11 470K C5 10 C10 0.1U C21 0.1U Application Notes Application circuit above can be applied to both COB and SOP Tolerance of all resistors = 1% Tolerance of capacitors = 5% Line out signal can be obtained through pin 6, 18 Speaker out signal can be obtained through pin 23, 24 9. ABSOLUTE MAXIMUM RATING (Ta = 25oC) [Under no circumstances should the absolute maximum ratings given below be violated. Stresses exceeding one or more of the limiting values may cause permanent damage to the device.] PARAMETER SYMBOL VALUE UNIT Supply Voltage Vcc 6 V Power Dissipation Pd 50 mW Operating Temperature Range Topr -20 to 70 o C -20 to 100 o C Storage Temperature Range Revision 1.2 Tstg Page 3 of 16 March 26, 2007 AP2600 4-Channel Audio Process 10. ELECTRICAL CHARACTERISTICS [Refer to the application circuit VCC=3.3V, Ta=25oC, f=1kHz, all controls flat unless otherwise specified] PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT SUPPLY Supply Voltage Vcc 2.7 3.3 5.5 V Supply Current Id - - 9 mA SVR - 80 - dB All flat, f=20 to 20kHz - -91 -89 All max, f=20 to 20kHz - -79 -77 All flat, f=1k - 80 - dB -1.5 - 1.5 dB -0.2 - 0.2 dB All flat - 0.05 0.1 All max - 0.1 0.2 All flat, THD=3% - - 1.5 All max, THD=3% - - 0.5 - 0.5 Vcc - V 54 60 66 kΩ Supply Rejection GENERAL Output Noise Channel Separation Nout SC Total Normalized Volume Set Error ΔGa Total Tracking Error (ch. L – ch. R) ΔGt Total Harmonic Distortion + Noise THD+N Maximum Input Voltage Internal Reference Voltage VIM G = 0 through –50dB Vref dBV % Vrms INPUT MASTER VOLUME Input Resistance Rin At pins 9-11, 14-16 Control Range Crange 78.25 78.75 79.25 dB Maximum Attenuation Amax 78.25 78.75 79.25 dB Step Resolution Astep dB Normalized Attenuation Set Error Tracking Error (ch. L – ch. R) 1 1.25 1.5 ΔGa G = 0 through –50dB -0.8 - 0.8 dB ΔGt G = 0 through –78.75dB -0.2 - 0.2 dB Crange 37 37.5 38 dB Maximum Attenuation Amax 37 37.5 38 dB Step Resolution Astep 1 1.25 1.5 dB Normalized Attenuation Set Error ΔGa G = 0 through –37.5dB -0.8 - 0.8 dB Tracking Error (ch. L – ch. R) ΔGt G = 0 through –37.5dB -0.2 - 0.2 dB Mute Attenuation Amute f=1k 90 100 - dB OUTPUT BALANCE AND VOLUME CONTROL Control Range OUTPUT GAIN CONTROL Maximum Output Gain Gmaxo 10.75 11.25 11.75 dB Minimum Output Gain Gmino -0.5 0 0.5 dB Step Resolution Astep 3.5 3.75 4 dB Revision 1.2 Page 4 of 16 March 26, 2007 AP2600 4-Channel Audio Process ELECTRICAL CHARACTERISTICS (continued) [Refer to the application circuit VCC=3.3V, Ta=25oC, Vin = -20dBV (0.1Vrms), f=1kHz unless otherwise specified] PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT ±13 ±14 ±15 dB 1.5 2 2.5 dB BASS Control Range Crange f=100Hz Step Resolution Astep Attenuation Set Error ΔGa G = -14 through 14dB -1 - 1 dB Tracking Error (ch. L – ch. R) ΔGt G = -14 through 14dB -0.5 - 0.5 dB f=20kHz ±13 ±14 ±15 dB 1.5 2 2.5 dB TREBLE Control Range Crange Step Resolution Astep Attenuation Set Error ΔGa G = -14 through 14dB -1 - 1 dB Tracking Error (ch. L – ch. R) ΔGt G = -14 through 14dB -0.5 - 0.5 dB Maximum Output Voltage Vom THD=3% at pin 6,18,23,24 - 1 Vcc - V Output DC Voltage Level Vdc At pin 6,18,23,24 - 0.5 Vcc - V Output Resistance Rout At pin 6,18,23,24 250 300 400 Ω Vrst - 0.3 Vcc - V Input High Voltage for Pin 27 VIH 0.7 Vcc - - V Input Low Voltage for Pin 27 VIL - - 0.3 Vcc V Input Threshold Voltage for Pin 26 VTH - 0.5 Vcc - V Output-Low Current for Pin 26 IOL - 4 - mA AUDIO OUTPUT POWER-ON RESET Start of Reset 2 DIGITAL CIRCUIT (I C-BUS) Revision 1.2 Page 5 of 16 March 26, 2007 AP2600 4-Channel Audio Process ELECTRICAL CHARACTERISTICS (continued) [Refer to the application circuit VCC=3.3V, Ta=25oC, Vin = -20dBV (0.1Vrms), f=1kHz unless otherwise specified] MAXIMUM INPUT VOLTAGE (THD=3%) FREQUENCY RESPONSE (Loudness) VIM - MAXIMUM INPUT VOLTAGE (V) 5 f = 1kHz 4 3 All flat 2 All maximum 1 Loudness on In vol. 0 to -50dB 0 2 2.5 3 3.5 4 4.5 5 5.5 6 V CC - SUPPLY VOLTAGE (V) FREQUENCY RESPONSE (Treble) Vin = -20dBV Lch Vout = Lch FREQUENCY RESPONSE (Bass) Vin = -20dBV Lch Vout = Lch Revision 1.2 Page 6 of 16 March 26, 2007 AP2600 4-Channel Audio Process 11. EQUALIZER DESCRIPTION In AP2600, there is a two-band digitally controlled stereo equalizer. The circuit structures of the Bass band and Treble band are similar. They are connected in a serial format. Each band can be considered as a filtering cell which can boost or cut the signal at certain frequency range. Bass Band Control Circuit A. Boost mode IN fO = OUT R3 R2 C1 C2 Q≈ 1 2 π R1(R2 + R3)(C1)(C2) 1 (C1)(C2)(R2) C1 + C2 R1 R2 + R3 +2 R1 G V = 20 log R3 +2 R1 R1 (Hz) (dB) B. Cut mode fO = IN OUT R2 R3 C2 C1 Q≈ 1 2 π R1(R2 + R3)(C1)(C2) 1 (C1)(C2)(R2) C1 + C2 R1 R3 +2 GV = 20 log R1 R2 + R3 +2 R1 R1 (Hz) (dB) Under both boost and cut mode, their center frequency (fo), Q-factor (Q) and maximum gain (Gv) can be controlled by the external components (C1, C2, R1). Corresponding instance names in application circuit are shown below: LEFT CHANNEL RIGHT CHANNEL INSTANCE NAME IN STRUCTURE C1 C2 R1 C1 C2 R1 INSTANCE NAME IN APPLICATION CIRCUIT C18 C17 R2 C7 C6 R1 Revision 1.2 Page 7 of 16 March 26, 2007 AP2600 4-Channel Audio Process Treble Band Control Circuit A. Boost mode IN OUT fO = 1 2 π(R1)(C1) R2 G V = 20 log R1 (Hz) R1+ R2 R1 (dB) C1 B. Cut mode IN R2 OUT fO = 1 2 π(R1)(C1) (Hz) R1 C1 G V = 20 log R1 R1+ R2 (dB) Under both boost and cut mode, their cut-off frequency (fo) can be controlled by the external component (C1). Corresponding instance names in application circuit are shown below: LEFT CHANNEL RIGHT CHANNEL INSTANCE NAME IN STRUCTURE C1 C1 INSTANCE NAME IN APPLICATION CIRCUIT C5 C16 Revision 1.2 Page 8 of 16 March 26, 2007 AP2600 4-Channel Audio Process 12. I2C-BUS CONCEPTS I2C-bus is a simple bi-directional, 2-wire serial data (SDA) and serial clock (SCL) bus for inter-IC control. Both lines must be connected to a positive supply via a pull-up resistor when connected to output of device. Device Address After the Start condition, the address of a Slave device is sent. This address is 7 bits long followed by an 8th-bit, which is a data direction bit (R/W): 0 indicates a transmission (Write), 1 indicates a request for data (Read). Data Validity One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH period of the clock pulse. Changes in the data line at this time will be interpreted as control signals. Acknowledge There is no limit to the number of data byte transferred between the start and stop conditions from transmitter to receiver. Each byte of 8 bits is followed by an acknowledge bit (ACK). A slave receiver must generate an ACK after the reception of each byte. Also a master must generate an ACK after the reception of each byte that has been clocked out of the slave transmitter. Device that acknowledges has to pull down the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the ACK related clock pulse, set-up and hold times must be taken into consideration. A master receiver must signal an end of data to the transmitter by not generating an ACK on the last byte that has been clocked out of the slave. In this case, the transmitter must release the data line HIGH to allow the master to generate a stop condition. SDA SCL SDA stable data valid change of data allowed Data Transfer Start and Stop Conditions Both data and clock remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data, while the clock is HIGH, is defined as the start condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the stop condition (P). SDA SDA SCL S SCL P START condition STOP condition Definition of START and STOP condition DATA OUTPUT BY TRANSMITTER not acknowledge DATA OUTPUT BY RECEIVER acknowledge SCL FROM MASTER 1 START condition Revision 1.2 2 8 9 clock pulse for acknowledge Acknowledgement on I2C-bus Page 9 of 16 March 26, 2007 AP2600 4-Channel Audio Process MSB LSB MSB 1 7 2-6 Slave Address Start Condition *NAK LSB *ACK ~ ~ ~ ~ SCL ~ ~ ~ ~ ~ ~ ~ SDA 1 8 9 R/W ACK 2-7 8 9 DATA ACK Stop Condition * NAK – SDA line is HIGH **ACK – SDA line is pulled LOW by receiver Overall Diagram 13. I2C-BUS FORMAT The interface protocol comprises: z A start condition (S) z A chip address byte z CHIP ADDRESS DATA 1 to DATA n MSB S 1 LSB 0 0 0 A sequence of data + acknowledge (A) A stop condition (P) z 1 0 0 0 MSB LSB A DATA A P The byte order and the number of bytes sent are arbitrary. The sequence of data is terminated by the stop condition. 14. DATA BYTE FUNCTION & POWER ON RESET CONDITION DATA BYTE POWER ON RESET CONDITION MSB FUNCTION LSB D7 D6 D5 D4 0 0 X 1 1 0 1 1 1 X MODE STATUS BIT STATUS D3 D2 D1 D0 X X X X X Input Volume 0dB D5:D0 000000 X X X X X 00000 X X X 0dB 0dB D4:D0 X Left Output Attenuation Right Output Attenuation D4:D0 00000 0dB OFF CH1 D4:D3 D2 D1:D0 11 1 00 0 1 0 X X X X X Output Gain Loudness Input Sources Selection 0 1 1 0 X X X X EQ Bass Level -14dB D3:D0 0000 0 1 1 1 X X X X EQ Treble Level -14dB D3:D0 0000 Revision 1.2 Page 10 of 16 March 26, 2007 AP2600 4-Channel Audio Process 15. SOFTWARE SPECIFICATION INPUT MASTER VOLUME SELECTION D5:D3 – input volume 10dB attenuation D2:D0 – input volume 1.25dB attenuation MSB D7 D6 0 0 D5 D4 D3 LSB INPUT VOLUME D2 D1 D0 1.25dB STEPS 0 0 0 0dB 0 0 1 -1.25dB 0 1 0 -2.5dB 0 1 1 -3.75dB 1 0 0 -5dB 1 0 1 -6.25dB 1 1 0 -7.5dB 1 1 1 -8.75dB 10dB STEPS 0 0 0 0 0 0dB 0 0 1 -10dB 0 1 0 -20dB 0 1 1 -30dB 1 0 0 -40dB 1 0 1 -50dB 1 1 0 -60dB 1 1 1 -70dB LEFT OUTPUT SPEAKER ATTENUATE SELECTION D4:D3 – left output speaker 10dB attenuation D2:D0 – left output speaker 1.25dB attenuation MSB D7 D6 D5 1 1 0 D4 D3 LSB LEFT OUTPUT SPEAKER ATTENUATION D2 D1 D0 1.25dB STEPS 0 0 0 0dB 0 0 1 -1.25dB 0 1 0 -2.5dB 0 1 1 -3.75dB 1 0 0 -5dB 1 0 1 -6.25dB 1 1 0 -7.5dB 1 1 1 -8.75dB 10dB STEPS 1 Revision 1.2 1 0 0 0 0dB 0 1 -10dB 1 0 -20dB 1 1 -30dB 1 1 1 1 1 Page 11 of 16 MUTE March 26, 2007 AP2600 4-Channel Audio Process RIGHT OUTPUT SPEAKER ATTENUATE SELECTION D4:D3 – right output speaker 10dB attenuation D2:D0 – right input speaker 1.25dB attenuation MSB D7 D6 D5 1 1 1 D4 D3 LSB RIGHT OUTPUT SPEAKER ATTENUATION D2 D1 D0 1.25dB STEPS 0 0 0 0dB 0 0 1 -1.25dB 0 1 0 -2.5dB 0 1 1 -3.75dB 1 0 0 -5dB 1 0 1 -6.25dB 1 1 0 -7.5dB 1 1 1 -8.75dB 10dB STEPS 1 1 1 0 0 0dB 0 1 -10dB 1 0 -20dB 1 1 -30dB 1 1 1 1 1 MUTE SOURCES SELECTION / LOUDNESS / OUTPUT GAIN SELECTION D4:D3 – output gain selection D2 – loudness ON/OFF D1:D0 – input sources selection D1 D0 INPUT SOURCES SELECTION LOUDNESS OUTPUT GAIN SELECTION 0 0 CH1 0 1 CH2 1 0 CH3 1 1 CH4 MSB LSB D7 D6 D5 0 1 0 Revision 1.2 D4 D3 D2 0 Loudness ON 1 Loudness OFF 0 0 Output Gain +11.25dB 0 1 Output Gain +7.5dB 1 0 Output Gain +3.75dB 1 1 No Gain Page 12 of 16 March 26, 2007 AP2600 4-Channel Audio Process BASS LEVEL SELECTION D3:D0 – bass level selection MSB LSB BASS LEVEL D7 D6 D5 D4 D3 D2 D1 D0 0 1 1 0 0 0 0 0 -14dB 0 0 0 1 -12dB 0 0 1 0 -10dB 0 0 1 1 -8dB 0 1 0 0 -6dB 0 1 0 1 -4dB 0 1 1 0 -2dB 0 1 1 1 0dB 1 1 1 1 0dB 1 1 1 0 2dB 1 1 0 1 4dB 1 1 0 0 6dB 1 0 1 1 8dB 1 0 1 0 10dB 1 0 0 1 12dB 1 0 0 0 14dB TREBLE LEVEL SELECTION D3:D0 – treble level selection MSB LSB TREBLE LEVEL D7 D6 D5 D4 D3 D2 D1 D0 0 1 1 1 0 0 0 0 -14dB 0 0 0 1 -12dB 0 0 1 0 -10dB 0 0 1 1 -8dB 0 1 0 0 -6dB 0 1 0 1 -4dB 0 1 1 0 -2dB 0 1 1 1 0dB 1 1 1 1 0dB 1 1 1 0 2dB 1 1 0 1 4dB 1 1 0 0 6dB 1 0 1 1 8dB 1 0 1 0 10dB 1 0 0 1 12dB 1 0 0 0 14dB Revision 1.2 Page 13 of 16 March 26, 2007 AP2600 4-Channel Audio Process 16. PACKAGE INFORMATION 1 PIN 1 LOCATION COB PACKAGE Revision 1.2 Page 14 of 16 March 26, 2007 AP2600 4-Channel Audio Process PACKAGE INFORMATION SOP28 PACKAGE Revision 1.2 Page 15 of 16 March 26, 2007 AP2600 4-Channel Audio Process Valence Semiconductor Design Limited Unit 2001, 20/F, APEC Plaza, 49 Hoi Yuen Road, Kwun Tong, Hong Kong Tel: (852) 2797 3288 Fax: (852) 2776 7770 Email: [email protected] Website: http://www.valencetech.com IMPORTANT NOTICE “Preliminary” product information describes products that are in production, but for which full characterization data is not yet available. ValenceTech Ltd. and its affiliates (“Valence”) believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express or implied). 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IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF VALENCE PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY VALENCE, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Revision 1.2 Page 16 of 16 March 26, 2007