16bits Stereo Audio DAC Integrated Headphone Driver with Volume Control

Transcription

1 6bits Stereo Audio DAC Integrated Headphone Driver with Volume Control FEATURES Operation range:.7v~6.5v Volume control range : 6dB to 39dB,.5dB/step Low power consumption, 7mW at V DD =3.3V (Audio code = 0000H) Mute function Flexibility power management No pop-noise No zero crossing distortion Audio format : Right justified, I S Serial control interface : I C Output voltage adjusted by the external resisters Excellent Power Supply Rejection Ratio(PSRR) Component less Cost effective Housed in SSOP6, QFN6 package APPLICATIONS Multimedia system, MP3, PDA, Portable Digital Audio. DESCRIPTION The is a 6-bits voltage-output Digital-to-Analog Converter (DAC) integrated class AB stereo headphone driver with volume control. It is fabricated in a CMOS process and features extremely low power dissipation, small package size and easy application. The accuracy of the matched coarse current sources, combined with the unique symmetrical decoding method, preclude zero-crossing distortion and ensures high quality audio reproduction. The has good feature for portable equipment, these features include the low voltage operation, low power consumption, flexible power management, component less and small package SSOP6,QFN6, make the ideally suited for use in portable digital audio equipments. BLOCK DIAGRAM REV 6 /8

2 PIN CONFIGURATION Symbol Pin Description HP-V DD Headphone supply voltage HP-Rout Right channel headphone output Line-Rout 3 Right channel line output Line-Rin 4 Right channel line input CAP 5 Capacitor connected V SS V DD Line-Lin Line-Lout HP-Lout HP-V SS 6 Ground 7 Audio bit clock input 8 Audio word select input 9 Audio data input 0 I C clock input I C data input Supply voltage 3 Left channel line input 4 Left channel line output 5 Left channel headphone output 6 Headphone ground HP-VDD HP-Rout Line-Rout Line-Rin CAP VSS 6 HP-VSS 5 HP-Lout 3 4 Line-Lout 4 3 Line-Lin 5 VDD SSOP6, I C interface Note: The control interface is I C only. The address code is 8CH (00000B). Symbol Pin Description Line-Rout Right channel line output Line-Rin Right channel line input CAP 3 Capacitor connected 6 HP-Rout HP VDD 5 4 HPVSS 3 HP-Lout V SS 4 Ground 5 Audio bit clock input Line-Rout Line-Lout 6 Audio word select input 7 Audio data input Line-Rin Line-Lin 8 I C clock input 9 I C data input CAP 3 0 VDD V DD Line-Lin 0 Supply voltage Left channel line input VSS 4 9 Line-Lout Left channel line output HP-Lout HP-V SS 3 Left channel headphone output 4 Headphone ground HP-V DD HP-Rout 5 Headphone supply voltage 6 Right channel headphone output QFN6, I C interface Note: The control interface is I C only. The address code is 88H (000000B). REV 6 /8

3 ORDERING INFORMATION Package Part number Packaging Marking Transport Media 6-Pin SSOP (lead free) GTR G.5k Units Tape and Reel 6-Pin SSOP (lead free) GU G 00 Units Tube 6-Pin QFN (lead free) QTR k Units Tape and Reel 6-Pin QFN (lead free) Q Units Tray RoHS Compliance ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit VDD Positive Supply Voltage 6.5 V V ESD Electrostatic Handling to 3000 V T STG Storage Temperature Range -65 to 50 T A Operating Ambient Temperature Range -40 to 85 T J Maximum Junction Temperature 50 T S Soldering Temperature, 0 seconds 60 R THJA Thermal Resistance from Junction to Ambient in Free Air SSOP6 QFN6 0 0 /W OPERATING RATINGS Symbol Parameter Min Typ Max Unit V DD Supply Voltage V REV 6 3/8

4 3.3V ELECTRICAL CHARACTERISTICS (Ta=5, V DD =3.3V, V SS =0V, f=khz, R L =3 ; unless otherwise specified) Symbol Parameter Conditions Min Typ Max Unit DC Characteristics V CAP Voltage at CAP V V DC Output DC level V V FS Full scale output voltage V FS =0.0* R F *V DD V FS -0% V FS V FS +0% V I Q Quiescent current Audio code 0000H ma I PD Power down current - - ua PSRR Power supply rejection ratio CAP=.uF (00Hz) db CAP=0uF (00Hz) 67 7 db CS Channel separation db ATT Mute attenuation db A GA Gain/Attenuation Max gain db Max attenuation db A STEP Gain/Attenuation step db E GA Gain/Attenuation step error db AC Characteristics Res Resolution bits THD+N Total harmonic distortion plus noise db % S/N Signal-to-noise ratio db Po Maximum output power (THD+N)/S < mw Vo Maximum output voltage swing (THD+N)/S < Vpp Bus Characteristics V IH Bus high input level V DD V V IL Bus low input level 0.3V DD - - V Note : R F : Feedback resistor REV 6 4/8

5 TYPICAL PERFORMANCE CHARACTERISTICS (Ta=5, R L =3, R F =k, sampling rate=4fs; unless otherwise specified) POWER DOWN CURRENT (ua) QUIESCENT CURRENT (ma) Code=60H Code=65H THD+N (%) f=khz SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Power down current vs. supply voltage Quiescent current vs. supply voltage THD+N vs. supply voltage CAP=0uF CAP=0uF CAP=0uF PSRR (db) CAP=.uF PSRR (db) CAP=.uF PSRR (db) CAP=.uF VDD=5V VRR=-0dBV VDD=3.3V VRR=-0dBV VDD=.7V VRR=-0dBV FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) PSRR vs. frequency PSRR vs. frequency PSRR vs. frequency MUTE ATTENUATION (db) f=khz CHANNEL SEPARATION (db) f=khz THD+N (%) VDD=.7V VDD=3.3V SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) FREQUENCY (Hz) Mute attenuation vs. supply voltage Channel separation vs. supply voltage THD+N vs. frequency REV 6 5/8

6 AUDIO TIMING AND FORMAT The accepts input serial data formats of 6-bit word length. Left and right data words are time multiplexed. The MSB must always be first. RIGHT LEFT t r t HB t f t LB t HW t SW t cr t SD t HD LSB MSB Fig. Timing of input signals Audio data format (,, ) Symbol Parameter Conditions Min Typ Max Unit VIL Input LOW level VDD V VIH Input HIGH level 0.7VDD - - V f Input Clock Frequency MHz BR Bit Rate Data Input Mbits/s f Word Select Input khz t r Rise Time - - ns t f Fall Time - - ns t Cr Bit Clock Cycle Time ns t HB Bit Clock High Time ns t LB Bit Clock Low Time ns t SD Data Set-up Time - - ns t HD Data Hold Time to Bit Clock - - ns t HW Word Select Hold Time - - ns t SW Word Select Set-up Time - - ns LEFT RIGHT MSB LSB MSB LSB Fig. Right justified format (Normal format) REV 6 6/8

7 LEFT RIGHT MSB LSB MSB LSB Fig.3 I S format I C BUS INTERFACE I C interface protocol The format consists of the following A START condition A chip address byte including the chip address. (7bits) The 8 th bit of the byte must be 0.(write=0, read=) The chip must always acknowledge the end of each transmitted byte. A data sequence (N-bytes + Acknowledge) A STOP condition S START CONDITION ADDRESS R/ W P STOP CONDITION Fig.4 I C format I C chip address 88H 8CH bits address W For QFN6 package only 7 bits address W For SSOP6 package only REV 6 7/8

8 I C data bytes description Volume control MSB LSB Function channel,.5db/step 0 0 b4 b3 b b b0 Left channel,.5db/step 0 0 Right channel,.5db/step Gain / Attenuation bits b4 b3 b b b0 Value (db) Value (db) Mute Initial state: Mute Power down mode MSB LSB Function 0 b4 b3 b b b0 Power down mode selection Power down bits b4=, Pull down CAP pin to ground (CAPGD) b4=0, Set the voltage of CAP to middle of supply voltage (CAPGD) b3=, Enable OPAmp power down (OPAPD) b3=0, Disable OPAmp power down (OPAPD) b=, Enable DAC power down (DACPD) b=0, Disable DAC power down (DACPD) b=, Enable headphone power down (HPPD) b=0, Disable headphone power down (HPPD) b0=, Enable DAC mute (DACM) b0=0, Disable DAC mute (DACM) Initial state: b0=b=b=b3=b4= REV 6 8/8

9 Audio format and power off MSB LSB Function b b0 Audio format selection and preparation for power off Audio format and power off bits b=, Enable preparation for power off b=0, Disable preparation for power off b0=, I S format b0=0, Right justified format (normal format) Initial state: b0=b=0. Power off : V DD down to 0V I C example The audio format is selected I S format. Audio format code = 8H. The initial state is right justified format. MSB LSB Data byte Start Stop address I S format DAC active. Code = 7BH. The initial state is enabled all power down mode when power on. Start Chip Address 0 0 Stop DACPD = 0 HP active, OPAmp active, CAP to / V DD, DAC keep active. Code = 6H. Set the voltage of CAP to middle of supply voltage, the charge time is approximately second. Start Chip Address Stop CAPGD = 0 HPPD = 0 OPAmp = 0 DACPD = 0 DAC mute off. Code = 60H. The chip entered active mode. Start Chip Address Stop DACM = 0 Set gain of channel at 0dB. Volume control code = BH. Start Chip Address Stop -ch, 0dB Set attenuation of left channel at.5db. Volume control code = CH. Start Chip Address Stop L-ch, -.5dB REV 6 9/8

10 Set attenuation of right channel at.5db. Volume control code = 4CH. Start Chip Address Stop R-ch, -.5dB Preparation for power off. Code = 8H or 83H. Start Chip Address x Stop Power Off Preparation = FM application. OPAmp active, HP active. DAC inactive, DAC mute off. Code = 65H. The chip enters line-in mode. Start Chip Address Stop HPPD = 0 OPAmp = 0 Power down mode (shut down mode). Code = 6FH The chip enters power down mode. The shut down current is approximately ua. Start Chip Address 0 0 Stop DACM = DACPD = HPPD = OPAmp = REV 6 0/8

11 OPERATION PROCEDURE The sequence of operation: power on active power down active power off. The basic flowcharts are as follows: Power Turn On Active Power Off Power Down (Shut Down) All the Digital Interface Signals Pull Low IC pull low Audio inputs pull low (,, ) V DD = GND Audio Format Selection Right justified: 80H (default) I S: 8H Active mode All Devices are active Volume Control volume down to mute both channels mute on Power On V DD = Supply voltage Default Codes Inside The Chip Volume control :00H Power down : 7FH Audio format : 80H Default Status The chip is in the power down mode, all devices are not active Volume Mute On Power up Code : 6DH Wait sec Code : 6H All Devices are active DAC Mute Off Code : 60H Volume Control Default volume = mute Volume up/down step by step Volume Control volume down to mute both channels mute on Power Off Preparation code : 8H or 83H wait 0. sec Power Down code : 6FH All devices are not active except CAPPD keep active Power Down code : 6FH All devices are not active except CAPPD keep active Keep All the Digital Interface Signals unchanged All the Digital Interface Signals Pull Low IC pull low Audio inputs pull low (,, ) Power Off Disconnect V DD V DD will be down to 0V Fig.6 Operational procedure REV 6 /8

12 APPLICATION INFORMATION A MP3 with FM application The analog and digital power can be supplied as single voltage. HP-VDD HP-VSS 0.uF 00uF Supply.7~5.5V VSS 0.uF VDD MCU Interface CAP Line-Lin Line-Lout Line-Rin Line-Rout 300K.uF RF CF RF CF RFM RFM FM-L FM-R FM Module Audio Decoder HP-Lout HP-Rout 47uF 3Ω 47uF 3Ω Headphone Note : Vo=0.069*R F *V DD Vpp at 0dB gain R F //C F to decide 3dB point For V DD =3V, R L =3, R F =4k, C F =390pF, Vo=.63Vpp R L =6, R F =k, C F =470pF, Vo=.50Vpp FM mode, V Line DC Gain = R F / R FM Fig.7 MP3 with FM application circuit. REV 6 /8

13 EXTERNAL DIMENSIONS SSOP6 D ZD E E A A H x 45 c Detail A Dimension in mm Dimension in inch Symbol Min Max Min Max A A A b c e BASIC 0.05 BASIC D E E L h L 0.54 BASIC 0.00 BASIC ZD 0.9 REF REF R R θ 0 o 8 o 0 o 8 o θ 0 o 0 o θ 5 o 5 o 5 o 5 o θ e b A θ L R R Detail A L θ QFN6 (3x3mm) D L D E E Symbol Dimension in mm Min Nom Max A A A3-0.03REF - b D D E E e BSC - L e b A A3 A REV 6 3/8

14 DEMO BOARD.7V ~ 6.5V -+ S5.7V ~ 6.5V + - a c S Audio Input LED S4 LED S LED3 S3 S4 (Power): POWER On/Off Power On: If this key is pressed until the LED power on(about 3 sec),then system is Power On. Power Off: If this key is pressed until the LED power off(about 3 sec),then system is Power Off. S (UP) & S3 (Down): Volume Control The volume key is used to adjust the volume of playing, and the segment is divided to 3 levels(-39db~+6db). The prime value is level 5(-33dB). Express full volume when LED3 is bright continuously. Express mute on when LED is bright continuously. S: Reset All I/O pins are reset to high. S5: I S/Normal This PIN is used to switch the mode of audio format. I S : a & c open. Normal : a & c short. REV 6 4/8

15 Circuit : AVDD 300k + 00uF 0.u L-IN phone jack + uf 00k + 47uF 3 4k 390p 4k.u 00 HPVdd HP-Rout 3 Line-Rout 4 Line-Rin 5 CAP 6 Vss 7 8 (SSOP6) HPVss HP-Lout Line-Lout Line-Lin Vdd u 390p 4k 4k + 47uF 3 phone jack + uf 00k R-IN DVCC 0pF M 0pF 0k + 0uF P3.0/RXD P3./TXD P3./INTO P3.3/INT P3.4/T0 P3.5/T P3.7 XTAL XTAL RST/VPP VCC AT89C05 P.0/AIN0 P./AIN P. P.3 P.4 P.5 P.6 P k DVCC REV 6 5/8

16 DEMO BOARD(IR) 6 a c Function description Label : Supply Input Supply voltage range is.4v to 6.5V. Label : This PIN is used to switch the mode of audio format. I S : a & c open. Normal : a & c short. Label 3: Reset All I/O pins are reset to default values. Label 4: LED The LED indicates IR received status and power status. Label 5: Digital Signal Input Connected to digital audio formats as IS, Right Justified and Left Justified. Label 6: Headphone Jack Used 3.5mm diameter of headphone with 3ohm REV 6 6/8

17 IR Controller Power ON/OFF : The power key. Press the key once to set power-on or power-off for. The default values are ATTENUATION 33dB. vol+ : The volume-up switch for stereo channel The volume increase by +db as the switch is pressed once, the maximum value is up to +6dB. The default value is -33dB on initial status. L-channel and R-channel are active synchronic. vol- : The volume-down switch for stereo channel The volume decrease by -db as the switch is pressed once, the minimum value is up to -39dB. L-channel and R-channel are active synchronic. Vol_L+ : The volume-up switch for left channel The volume increase by +db as the switch is pressed once, the maximum value is up to +6dB. Vol_L - : The volume-down switch for left channel The volume decrease by -db as the switch is pressed once, the minimum value is up to -39dB. Vol_R+ : The volume-up switch for right channel The volume increase by +db as the switch is pressed once, the maximum value is up to +6dB. Vol_R- : The volume-down switch for right channel The volume decrease by -db as the switch is pressed once, the minimum value is up to -39dB. Mute : Press the switch once to enter mute-on or mute-off. The default status is mute-off on initial status. REV 6 7/8

18 REV 6 8/8 Circuit HPVDD HP-Rout Line-Rout 3 Line-Rin 4 CAP 5 Vss HPVss 6 HP-Lout 5 Line-Lout 4 Line-Lin 3 VDD 0 9 U C0 47u C9 04 R4 4k C 36 C8 04 J4 PHONEJ Y M R9 4k C 30 J3 AVDD C3 47u C5 30 C6 36 R6 k R7 k R8 k C4.u RST P3.0 P3. 3 XTAL 4 XTAL 5 P3. 6 P3.3 7 P3.4 8 P3.5 9 GND 0 Vcc 0 P.7 9 P.6 8 P.5 7 P.4 6 P.3 5 P. 4 P. 3 P.0 P3.7 J6 AT89C05 C4 0 C5 0 J5 DVCC R0 0k S RST C3 0u D Power D VOL- D3 VOL+ FM_R Text 3 J Line In 3 4 J Audio format R3 00k R 00k L R 4k R5 4k R k R k R3 k C u C u FM_L C7 00u S5 IS/Normal R4 300k Vc IR 3 GND Q IR C6+ 47u +C7 470P R5 0 R6 0K DGND IR_IN IR_IN