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| TS4974 1W Differential Audio Power Amplifier with Up/Down Digital Volume Control Pins PRODUCT PREVIEW s s s s s s s s s s s Operating from VCC = 2.5V to 5.5V Zero pop&clickless circuit 1.W output power @ Vcc=5V, THD=1%, F=1kHz, with 8 Load Ultra low consumption in standby mode (2A max.) 85dB PSRR @ 217Hz 16 digital volume control steps Two up and down volume control discrete pins Gain range from -33dB to + 12dB Integrated debouncing system Ultra fast start up time: 15ms typ. DFN10 3X3 mm pitch 0.5 Pin Connections (top view) TS4974IQ DFN Package Description At 3.3v, the TS4974 is a dual power audio amplifier capable of delivering 380mW of continuous RMS ouput power into a 8 bridgedtied loads with 1% THD+N. An external standby mode control reduces the supply current to less than 2A. An internal over-temperature shutdown protection is provided. The TS4974 has been designed for high quality audio applications such as mobile phones and for minimizing the number of external components. The TS4974 features a 16 step digital volume control through two discrete control Up and Down pins. The start-up gain is internally fixed to -12dB. An integrated debounce system prevents voltage pikes on UP/DOWN pins during volume control mode to be taken into account during a debounce time of 10ms (typ.). TS4974IQ - Pinout VINVIN+ BYPASS STANDBY GND 1 2 3 4 5 10 9 8 7 6 VCC VOUTVOUT+ UP / DVC DOWN / DVC Applications s Mobile phones (cellular / cordless) s PDAs s Laptop/notebook computers s Portable audio devices Order Codes Part Number TS4974IQT Temperature Range -40, +85C Package QFN Packaging Tape & Reel Marking TBA November 2004 Revision 1 1/8 This is preliminary information on a new product now in development. Details are subject to change without notice. TS4974 1 Absolute Maximum Ratings Absolute Maximum Ratings Table 1: Key parameters and their absolute maximum ratings Symbol Vcc Vi Toper Tstg Tj Rthja Pd ESD Supply voltage 1 Input Voltage 2 Operating Free Air Temperature Range Storage Temperature Maximum Junction Temperature Thermal Resistance Junction to Ambient Power Dissipation 5 3 Parameter Value 6 GND to VCC -40 to + 85 -65 to +150 150 200 Internally Limited4 2 200 200 260 Unit V V C C C C/W kV V mA C Human Body Model ESD Machine Model ( min Value ) Latch-up Latch-up Immunity Lead Temperature (soldering, 10sec) 1) All voltages values are measured with respect to the ground pin. 2) The magnitude of input signal must never exceed VCC + 0.3V / GND - 0.3V. 3) Device is protected in case of over temperature by a thermal shutdown active @ 150C. 4) Exceeding the power derating curves during a long period, may involve abnormal operating condition. 5) Human body model, 100pF discharged through a 1.5kOhm resistor, into pin to Vcc device. Table 2: Operating Conditions Symbol Vcc VSTB Supply Voltage Standby Voltage Input : Device ON Device OFF Volume control UP/DOWN voltage input: UP/DOWN mode ON UP/DOWN mode OFF Load Resistor Thermal Shutdown Temperature Thermal Resistance Junction to Ambient 1 125mm2. Parameter Value 2.5 to 5.5 1.5 VSTB VCC GND VSTB 0.4 0 VU/D 30% of VCC 40% of VCC VU/D VCC Unit V V VU/D RL TSD Rthja V 8 150 80 C C/W 1) With Heat Sink Surface = 2/8 Application Information 1 Application Information TS4974 Figure 1: Typical application schematics VCC + 1F Cs Vin+ + OUT1 DIFFERENTIAL INPUT STAGE 330nF 8 + Vin330nF OUT2 BIAS TS4974 DIGITAL VOLUME CONTROL BYPASS 1F + Cb STBY STDBY GND UP DOWN Operation Mode The TS4974 is a fully differential power amplifier which enables better performances in terms of noise immunity and PSRR. The TS4974 features a digital volume control with an internal gain range from -33dB up to +12dB, by steps of 3dB. When the device is firstly biased, an initial gain of -12dB is internally fixed. When standby mode is activated, the gain value is memorized and held until standby is released. The volume is controlled by means of two pins UP and DOWN on which the application of a VIL voltage will activate the increase or decrease in gain. The TS4974 integrates a debouncing system which does not allow to take into account UP or DOWN pulse shorter than Tdebounce time. Moreover an autorepeat function is implemented. When a continuous voltage is applied on UP or DOWN pin, the gain is continuously increased or decreased after a certain time called Tautorepeat. The first period of each autorepeat sequence is longer ( x1.5Tauto ) to avoid any parasitic activation. In this operational mode, Trange time is necessary to cover the whole gain range of the device. 3/8 TS4974 2 Electrical Characteristics Electrical Characteristics Table 3: VCC = +5V, GND = 0V, Tamb = 25C (unless otherwise specified) Symbol ICC ISTANDBY Voo Po Supply Current No input signal, no load Standby Current No input signal, Vstdby = Gnd, RL = 8 Output Offset Voltage No input signal, RL = 8, Floating inputs Output Power THD = 1% Max, f = 1kHz, RL = 8 Total Harmonic Distortion + Noise Po = 500mW rms, 20Hz < F < 20kHz, RL = 8, 0dB gain, Cb=1F, Cin=330nF Power Supply Rejection Ratio1 F = 217Hz, RL = 8, ) Vripple = 200mVpp, Input Grounded, Cb=1F, Cin=330nF Common Mode Rejection Ratio2 F = 217Hz, RL = 8, Vincm = 200mVpp, Cb = 1F, Cin=330nF Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8, THD + N 0.5%, 20Hz < F < 20kHz) Start up Gain Digital Gain Range -33 3 -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8 Unweighted Weighted A Zin Tdebounce Tautorepeat Trange Differential input impedance Debouncing time Time between volume changes During autorepeat mode, necessary time to cover the whole gain range 48 15 21 17 60 10 160 2500 75 +1 75 0.8 Parameter Min. Typ. 3.2 300 5 1 2000 20 Max. Unit mA nA mV W THD + N 0.5 % PSRR 85 dB CMRR 45 61 dB SNR Gs G Gain Step size Gain accuracy Twu VN 100 -12 +12 dB dB dB dB dB ms VRMS k ms ms ms 1) Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz. 2) Dynamic measurements - 20*log(rms(Vout)/rms(Vincm)). 4/8 Electrical Characteristics Table 4: VCC = +3.3V, GND = 0V, Tamb = 25C (unless otherwise specified) Symbol ICC ISTANDBY Voo Po Supply Current No input signal, no load Standby Current No input signal, Vstdby = Gnd, RL = 8 Output Offset Voltage No input signal, RL = 8, Floating inputs Output Power THD = 1% Max, f = 1kHz, RL = 8 Total Harmonic Distortion + Noise Po = 250mW rms, 20Hz < F < 20kHz, RL = 8, 0dB gain, Cb=1F, Cin=330nF Power Supply Rejection Ratio1 F = 217Hz, RL = 8, ) Vripple = 200mVpp, Input Grounded, Cb=1F, Cin=330nF Common Mode Rejection Ratio2 F = 217Hz, RL = 8, Vincm = 200mVpp, Cb = 1F, Cin=330nF Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8, THD + N 0.5%, 20Hz < F < 20kHz) Start up Gain Digital Gain Range -33 3 -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8 Unweighted Weighted A Zin Tdebounce Tautorepeat Trange Differential input impedance Debouncing time time between volume change During autorepeat mode, necessary time to cover the whole gain range 48 15 21 17 60 10 160 2500 75 +1 75 300 Parameter Min. Typ. 3.0 230 5 380 2000 20 Max. TS4974 Unit mA nA mV mW THD + N 0.5 % PSRR 85 dB CMRR 45 61 dB SNR Gs G Gain Step size Gain accuracy Twu VN 100 -12 +12 dB dB dB dB dB ms VRMS k ms ms ms 1) Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz. 2) Dynamic measurements - 20*log(rms(Vout)/rms(Vincm)). 5/8 TS4974 Electrical Characteristics Table 5: VCC = +2.6V, GND = 0V, Tamb = 25C (unless otherwise specified) Symbol ICC ISTANDBY Voo Po Supply Current No input signal, no load Standby Current No input signal, Vstdby = Gnd, RL = 8 Output Offset Voltage No input signal, RL = 8, Floating inputs Output Power THD = 1% Max, f = 1kHz, RL = 8 Total Harmonic Distortion + Noise Po = 150mW rms, 20Hz < F < 20kHz, RL = 8, 0dB gain, Cb=1F, Cin=330nF Power Supply Rejection Ratio1 F = 217Hz, RL = 8, ) Vripple = 200mVpp, Input Grounded, Cb=1F, Cin=330nF Common Mode Rejection Ratio2 F = 217Hz, RL = 8, Vincm = 200mVpp, Cb = 1F, Cin=330nF Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8, THD + N 0.5%, 20Hz < F < 20kHz) Start up Gain Digital Gain Range -33 3 -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8 Unweighted Weighted A Zin Tdebounce Tautorepeat Trange 1) 2) Parameter Min. Typ. 2.8 265 5 Max. Unit mA 2000 20 nA mV mW 200 250 THD + N 0.5 % PSRR 75 85 dB CMRR 45 61 dB SNR Gs G Gain Step size Gain accuracy Twu VN 100 -12 +12 dB dB dB dB +1 dB ms 15 21 17 48 60 10 160 2500 75 VRMS k ms ms ms Differential input impedance Debouncing time time between volume change During autorepeat mode, necessary time to cover the whole gain range Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz. Dynamic measurements - 20*log(rms(Vout)/rms(Vincm)). 6/8 Package Mechanical Data 3 Package Mechanical Data 3.2 Marking (top view) TS4974 3.1 Pinout (top view) VINVIN+ BYPASS STANDBY GND 1 2 3 4 5 10 9 8 7 6 VCC VOUTVOUT+ UP / DVC DOWN / DVC s s s s Logo : ST Part Number : A74 Date Code : YWW The Dot is for marking pin 1 s Balls are underneath 3.3 DFN10 3X3 Package ( all dimensions in mm ) 3.0 10 3.0 0.35 0.8 1 0.25 0.5 * The Exposed Pad is connected to the Ground 7/8 TS4974 4 Revision History Date 01 Nov 2004 Revision 1 First Release Description of Changes Revision History 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. Specifications 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 All other names are the property of their respective owners (c) 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 8/8 |
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