TS4974 1W Differential Audio Power Amplifier with Up/Down Digital Volume Control Pins PRODUCT PREVIEW ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operating from VCC = 2.5V to 5.5V Zero pop&clickless circuit 1.W output power @ Vcc=5V, THD=1%, F=1kHz, with 8Ω Load Ultra low consumption in standby mode (2µA 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 8Ω bridgedtied loads with 1% THD+N. An external standby mode control reduces the supply current to less than 2µA. An internal over-temperature shutdown protection is provided. TS4974IQ - Pinout VIN- 1 10 VIN+ 2 9 VOUT- BYPASS 3 8 VOUT+ STANDBY 4 7 UP / DVC GND 5 6 DOWN / DVC 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.). VCC Applications ■ Mobile phones (cellular / cordless) ■ PDAs ■ Laptop/notebook computers ■ Portable audio devices Order Codes Part Number TS4974IQT November 2004 Temperature Range Package Packaging Marking -40, +85°C QFN Tape & Reel TBA Revision 1 This is preliminary information on a new product now in development. Details are subject to change without notice. 1/8 TS4974 1 Absolute Maximum Ratings Absolute Maximum Ratings Table 1: Key parameters and their absolute maximum ratings Symbol Parameter 1 Value Unit 6 V V Toper Input Voltage Operating Free Air Temperature Range GND to VCC -40 to + 85 °C Tstg Storage Temperature Vcc Vi Tj Rthja Pd Supply voltage 2 -65 to +150 °C Maximum Junction Temperature 150 °C Thermal Resistance Junction to Ambient 3 Power Dissipation 200 °C/W Internally Human Body Model5 ESD Machine Model ( min Value ) Latch-up Latch-up Immunity Lead Temperature (soldering, 10sec) ESD Limited4 2 kV 200 200 260 V mA °C Value Unit 2.5 to 5.5 V 1.5 ≤ VSTB ≤ VCC GND ≤ VSTB ≤ 0.4 V 0 ≤ VU/D ≤ 30% of VCC 40% of VCC ≤ VU/D ≤ VCC V 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 @ 150°C. 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 Parameter Supply Voltage Standby Voltage Input : Device ON Device OFF VU/D Volume control UP/DOWN voltage input: UP/DOWN mode ON UP/DOWN mode OFF RL TSD Load Resistor Thermal Shutdown Temperature ≥8 150 Ω °C Rthja Thermal Resistance Junction to Ambient 1 80 °C/W 1) With Heat Sink Surface = 125mm2. 2/8 Application Information 1 TS4974 Application Information Figure 1: Typical application schematics VCC + 1µF Cs Vin+ + 330nF OUT1 DIFFERENTIAL INPUT STAGE 8 Ω + VinOUT2 330nF BIAS TS4974 DIGITAL VOLUME CONTROL BYPASS 1µF + STBY Cb 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 = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Supply Current No input signal, no load 3.2 ISTANDBY Standby Current No input signal, Vstdby = Gnd, RL = 8Ω 300 2000 nA Voo Output Offset Voltage No input signal, RL = 8Ω, Floating inputs 5 20 mV Po Output Power THD = 1% Max, f = 1kHz, RL = 8Ω ICC THD + N 0.8 Total Harmonic Distortion + Noise Po = 500mW rms, 20Hz < F < 20kHz, RL = 8Ω, 0dB gain, Cb=1µF, Cin=330nF mA 1 W 0.5 % PSRR Power Supply Rejection Ratio1 F = 217Hz, RL = 8Ω, ) Vripple = 200mVpp, Input Grounded, Cb=1µF, Cin=330nF 75 85 dB CMRR Common Mode Rejection Ratio2 F = 217Hz, RL = 8Ω, Vincm = 200mVpp, Cb = 1µF, Cin=330nF 45 61 dB Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8Ω, THD + N ≤ 0.5%, 20Hz < F < 20kHz) 100 dB Gs Start up Gain -12 dB G Digital Gain Range SNR -33 Gain Step size 3 Gain accuracy Twu VN -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8Ω Unweighted Weighted A Zin +12 Differential input impedance 48 dB dB +1 dB 15 ms 21 17 µVRMS 60 75 kΩ Tdebounce Debouncing time 10 ms Tautorepeat Time between volume changes 160 ms During autorepeat mode, necessary time to cover the whole gain range 2500 ms Trange 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 TS4974 Table 4: VCC = +3.3V, GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Supply Current No input signal, no load 3.0 ISTANDBY Standby Current No input signal, Vstdby = Gnd, RL = 8Ω 230 2000 nA Voo Output Offset Voltage No input signal, RL = 8Ω, Floating inputs 5 20 mV Po Output Power THD = 1% Max, f = 1kHz, RL = 8Ω ICC THD + N 300 Total Harmonic Distortion + Noise Po = 250mW rms, 20Hz < F < 20kHz, RL = 8Ω, 0dB gain, Cb=1µF, Cin=330nF mA 380 mW 0.5 % PSRR Power Supply Rejection Ratio1 F = 217Hz, RL = 8Ω, ) Vripple = 200mVpp, Input Grounded, Cb=1µF, Cin=330nF 75 85 dB CMRR Common Mode Rejection Ratio2 F = 217Hz, RL = 8Ω, Vincm = 200mVpp, Cb = 1µF, Cin=330nF 45 61 dB Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8Ω, THD + N ≤ 0.5%, 20Hz < F < 20kHz) 100 dB Gs Start up Gain -12 dB G Digital Gain Range SNR -33 Gain Step size 3 Gain accuracy Twu VN -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8Ω Unweighted Weighted A Zin +12 Differential input impedance 48 dB dB +1 dB 15 ms 21 17 µVRMS 60 75 kΩ Tdebounce Debouncing time 10 ms Tautorepeat time between volume change 160 ms During autorepeat mode, necessary time to cover the whole gain range 2500 ms Trange 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 = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Supply Current No input signal, no load 2.8 ISTANDBY Standby Current No input signal, Vstdby = Gnd, RL = 8Ω 265 2000 nA Voo Output Offset Voltage No input signal, RL = 8Ω, Floating inputs 5 20 mV Po Output Power THD = 1% Max, f = 1kHz, RL = 8Ω ICC THD + N 200 Total Harmonic Distortion + Noise Po = 150mW rms, 20Hz < F < 20kHz, RL = 8Ω, 0dB gain, Cb=1µF, Cin=330nF mA 250 mW 0.5 % PSRR Power Supply Rejection Ratio1 F = 217Hz, RL = 8Ω, ) Vripple = 200mVpp, Input Grounded, Cb=1µF, Cin=330nF 75 85 dB CMRR Common Mode Rejection Ratio2 F = 217Hz, RL = 8Ω, Vincm = 200mVpp, Cb = 1µF, Cin=330nF 45 61 dB Signal-to-Noise Ratio ( Weighted A, 6dB gain ) ( RL = 8Ω, THD + N ≤ 0.5%, 20Hz < F < 20kHz) 100 dB Gs Start up Gain -12 dB G Digital Gain Range SNR -33 Gain Step size 3 Gain accuracy Twu VN -1 Wake-up Time Output Voltage Noise F = 20Hz to 20kHz, RL = 8Ω Unweighted Differential input impedance +1 60 dB ms µVRMS 21 17 48 dB dB 15 Weighted A Zin +12 75 kΩ Tdebounce Debouncing time 10 ms Tautorepeat time between volume change 160 ms During autorepeat mode, necessary time to cover the whole gain range 2500 ms Trange 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)). 6/8 Package Mechanical Data 3 TS4974 Package Mechanical Data 3.1 Pinout (top view) 3.2 Marking (top view) VIN- 1 10 VIN+ 2 9 VOUT- BYPASS 3 8 VOUT+ STANDBY 4 7 UP / DVC GND 5 6 DOWN / DVC VCC ■ ■ ■ ■ Logo : ST Part Number : A74 Date Code : YWW The Dot is for marking pin 1 ■ Balls are underneath 3.3 DFN10 3X3 Package ( all dimensions in mm ) 3.0 10 3.0 0.35 1 0.8 0.25 0.5 * The Exposed Pad is connected to the Ground 7/8 TS4974 4 Revision History Revision History Date Revision 01 Nov 2004 1 Description of Changes First Release 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 © 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