三合微科股份有限公司 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL The information in this document is subject to change without notice. c SAMHOP Microelectronics Corp. All Rights Reserved. 台北縣新店市民權路100號7樓 7F,No.100,Min-Chyuan Road, Hsintien, Taipei Hsien, Taiwan, R.O.C. TEL: 886-2-2218-3978/2820 FAX: 886-2-2218-3320 Email : [email protected] SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL GENERAL DESCRIPTION FEATURES The SM7516 is a stereo audio power amplifier that drives 3 W/channel of continuous RMS power into a 3-Ω load. Advanced dc volume control minimizes external components and allows BTL (speaker) volume control and SE (headphone) volume control. Notebook and pocket PCs benefit from the integrated feature set that minimizes external components without sacrificing functionality. * Advanced DC Volume Control With 2-dB Steps From -40 dB to 20 dB - Maximum Volume Setting for SE Mode - Adjustable SE Volume control Referenced to BTL Volume Control To simplify design, the speaker volume level is adjusted by applying a dc voltage to the VOLUME terminal. * 3 W Into 3-Ω Speakers APPLICATIONS PIN ASSIGNMENTS (TOP VIEW) * Notebook PC RLINEIN 1 12 ROUT- * LCD Monitors LLINEIN 2 11 ROUT+ LOUT- 3 10 SE/BTL VDD 4 9 VOLUME LOUT+ 5 8 GND SHUTDOWN 6 7 BYPASS * Portable DVD Player * Digital photo frame SM7516 HDIP 12PIN Page 1 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PIN DESCRIPTIONS No. Pin name I/O Function 1 RLINEIN I Right channel input signal. 2 LLINEIN I Left channel input signal. 3 LOUT - O Left channel negative audio output. 4 VDD - Supply voltage terminal. 5 LOUT + O Left channel positive audio output. 6 SHUTDOWN I Places the amplifier in shutdown mode if a TTL logic low is placed on This terminal. 7 BYPASS I Tap to voltage divider for internal midsupply bias generator used for analog reference. 8 GND - Power ground. 9 VOLUME I Terminal for DC volume control. DC voltage range is 0V to 5V. 10 SE/BTL I Output MUX control. When this terminal is high, SE outputs are selected. When this terminal is low, BTL outputs are selected. 11 ROUT + O Right channel positive audio output. 12 ROUT - O Right channel negative audio output. Page 2 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL MAXIMUM RATINGS (Ta = 40~85oC) Characteristic Symbol Supply Voltage, VDD, PVDD Rating Unit VSS -0.3 ~ 6 V Input Voltage VI - 0.3 ~ VDD +0.3 V Operating free-air temperature range TA - 40 ~ 85 Storage temperatuer range - TJ - 40 ~ 150 o Tstg - 65 ~ 150 o C C C Operaing junction temperature range Continous total power dissipation - See Dissipation Rating Table o Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds - 260 o C RECOMMENDED OPERATING CONDITION Characteristic Supply Voltage, VDD, PVDD Symbol Condition Min. Typ. Max. Unit VSS -- 4.0 - 5.5 V VIH SE/BTL 0.8 VDD - - VIH SHUTDOWN 2.0 - - VIL SE/BTL - - 0.3 VDD VIL SHUTDOWN - 0.6 TA -- -40 - High-level input voltage Low-level input voltage Operating free-air temperature Page 3 85 V V o C V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL ELECTRICAL CHARACTERISTICS (VDD =PVDD = 5.5V, Ta = 25oC unless otherwise noted) Characteristic Symbol Condition Min. Typ. Max. Unit VOO VDD=5.5V,Gain=20dB, SE/BTL=0V - - 60 mV -42 -70 - dB Output offset voltage (measured differentially) Power supply rejection ratio PSRR VDD=PVDD=4.0V to 5.5V High-level input current (SE/BTL,SHUTDOWN,VOLUME) llH VDD=PVDD=5.5V, Vl=VDD=PVDD - - 1 uA Low-level input current(SE/BTL,SHUTDOWN,VOLUME) llL VDD=PVDD=5.5V , Vl=0V - - 1 uA 5.5 8.0 10 3.0 5.0 6.0 - 1.5 - ARMS - 1 20 uA Unit Supply current, no load lDD Supply current,max power into a 3Ω load lDD Supply current,shutdown mode VDD=PVDD=5.5V,SE/BTL=0V, SHUTDOWN=2V VDD=PVDD=5.5V,SE/BTL=5.5V, SHUTDOWN=2V VDD=5V=PVDD,SE/BTL=0V, SHUTDOWN=2V,RL=3Ω, PO=2W,Stereo lDD(SD) SHUTDOWN=0.0V mA OPERATING CHARACTERISTICS (VDD =PVDD = 5V, RL = 3Ω, Gain = 6dB, Ta = 25oC unless otherwise noted) Characteristic Symbol Condition Min. Typ. Max. THD+N=1% - 1.9 THD+N=10% - 2.3 1.7 - VDD=5.5V, f = 1KHz, THD+N =10% - 3 - PO =1W, RL=8Ω, f=20Hz to 20kHz - < 0.6 - % RL=8Ω, Measured between output and VDD RL=8Ω, Measured between output and GND Measured at pin 11, No load, VDD=5.5V - - 600 mV - - 400 mV 2.65 2.75 2.85 V - 85 - μVRMS f = 1KHz, RL =4Ω, BTL Mode , Gain =20 dB Output Power (1) Total harmonic distortion+noise PO THD+N High-level output voltage VOH Low-level output voltage VOL Bypass voltage(Nominally VDD/2)(2) Noise output voltage V(BYPASS) f = 1KHz, RL =8Ω, BTL Mode , Gain =20 dB THD+N=1% THD+N=10% f= 20 Hz to 20 kHz, Gain=0 dB, C(BYP)= 1.0 uF BTL 1.4 W (1) Output power is measured at the output terminals of the IC. (2) At 4V < VDD < 5.5V the DC bypass voltage is approximately VDD/2 Page 4 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL Table 1. DC Volume Control (BTL Mode, VDD=5V) VOLUME FROM (V) TO (V) GAIN OF AMPLIFIER (Typ.) 0.00 0.23 -85 0.31 0.34 -40 0.42 0.46 -38 0.54 0.56 -36 0.65 0.67 -34 0.76 0.79 -32 0.87 0.90 -30 0.98 1.01 -28 1.10 1.12 -26 1.21 1.24 -24 1.32 1.35 -22 1.43 1.46 -20 1.54 1.57 -18 1.66 1.68 -16 1.77 1.79 -14 1.88 1.91 -12 1.99 2.02 -10 2.10 2.13 -8 2.21 2.24 -6 2.33 2.35 -4 2.44 2.47 -2 2.55 2.57 0 2.67 2.70 2 2.77 2.80 4 2.89 2.92 6 3.00 3.03 8 3.11 3.14 10 3.22 3.26 12 3.33 3.37 14 3.44 3.48 16 3.55 3.60 18 3.67 5.00 20 Page 5 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL APPLICATION INFORMATION The figure is schematic diagrams of typical notebook computer application circuits. Right Speaker Right Line Audio Source Ci Left Line Audio Source 1 Ci 2 RLINEIN ROUT- LLINEIN ROUT+ Cc 12 11 VDD 100kΩ 4 VDD SE/BTL VDD 10 1kΩ 100kΩ Cs 7 BYPASS VOLUME 9 C(BYP) 8 GND LOUT + From DAC or Potentiometer (DC Voltage) Headphones 5 Cc 1kΩ System Control 6 SHUTDOWN LOUT - 3 Left Speaker Figure 1. SM7516 Application Circuit Using Single-Ended Inputs Page 6 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL SE/BTL OPERATION The ability of the SM7516 to easily switch between BTL and SE modes is one of its most important cost saving features. This feature eliminates the requirement for an additional headphone amplifier in applications where internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated. Internal to the SM7516, two separate amplifiers drive OUT+ and OUT-. The SE/BTL input controls the operation of the follower amplifier that drives LOUT- and ROUT-. When SE/BTL is held low, the amplifier is on and the SM7516 is in the BTL mode. When SE/BTL is held high, the OUT- amplifiers are in a high output impedance state, which configures the SM7516 as an SE driver from LOUT+ and ROUT+. IDD is reduced by approximately one-third in SE mode. Control of the SE/BTL input can be from a logic-level CMOS source or, more typically, from a resistor divider network as shown in Figure 2. The trip level for the SE/BTL input can be found in the recommended operating condition table. APPLICATION INFORMATION (continued) RLINEIN _ _ + ROUT+ + BYP BYP VDD _ + ROUTEN SE/BTL BYP 100KΩ Co 330μF 1KΩ 100KΩ LOUT+ Figure 2. SM7516 Resistor Divider Network Circuit Using a 1/8-in. (3,5mm) stereo headphone jack, the control switch is closed when no plug is inserted. When closed the 100KΩ/1KΩ divider pulls the SE/BTL input low. When a plug is inserted, the 1KΩ resistor is disconnected and SE/BTL input is pulled high. When the input goes high, the OUT- amplifier is shut down causing the speaker to mute (open-circuits the speaker). The OUT+ amplifier then drives through the output capacitor (CO) into the headphone jack. Page 7 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL SHUTDOWN MODES The SM7516 employs a shutdown mode of operation designed to reduce supply current (IDD) to the absolute minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to mute and the amplifier to enter a low-current state, I DD = 20μA. SHUTDOWN should never be left unconnected because amplifier operation would be unpredictable. VOLUME OPERATION The VOLUME controls the BTL volume when driving speakers and the SE volume when driving headphones. The pin is controlled with a dc voltage, which should not exceed VDD. When driving speakers in BTL mode, the VOLUME pin is the only pin that controls the gain. Table 1 shows the gain for the BTL mode. The voltage listed in the table are for VDD=5V. For a different VDD, the values in the table scale linearly. If VDD=4V, multiply all the voltages in the table by 4V/5V or 0.8. Some audio systems require that the gain be limited in the single-ended mode to a level that is comfortable for headphone listening. Most volume control devices only have one terminal for setting the gain. For example, if the speaker gain is 20 dB, the gain in the headphone channel is fixed at 14 dB. Table 1 show a range of voltages for each gain step. There is a gap in the voltage between each gain step. This gap represents the hysteresis about each trip point in the internal comparator. The hysteresis ensures that the gain control is monotonic and does not oscillate from one gain step to another. If a potentiometer is used to adjust the voltage on the control terminals, the gain increases as the potentiometer is turned in one direction and decreases as it is turned back the other direction. The trip point, where the gain actually changes, is different depending on whether the voltage is increased or decreased as a result of the hysteresis about each trip point. The gaps can also be thought of as indeterminate states where the gain could be in the next higher gain step or the lower gain step depending on the direction the voltage is changing. If using a DAC to control the volume, set the volume, set the voltage in the middle of each range to ensure that the desired gain is achieved. TABLE OF GRAPHS FIGURE THD+N Total harmonic distortion plus noise(BTL) vs Frequency 3,4,5 vs Output power 6,7,8 vs Frequency 11,12 vs Frequency 13 Closed loop response Crosstalk PSRR Power supply ripple rejection(BTL) 9,10 Page 8 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL TOTAL HARMONIC DISTORTION + NOISE VS. FREQUENCY TOTAL HARMONIC DISTORTION + NOISE VS. FREQUENCY THD + N (%) VDD = 5V Load = 8 ohms Po = 1 W BTL Mode THD + N (%) VDD = 5V Load = 4 ohms Po= 1.5 W BTL Mode 20dB 20dB 6dB 6dB FREQUENCY (Hz) Figure 4 FREQUENCY (Hz) Figure 3 Figure 4 TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 4 V Load = 4 ohms Gain = 20 dB BTL Mode 20KHz 20 Hz THD + N (%) THD + N (%) VDD = 5 V Load = 4 ohms Gain = 20 dB BTL Mode 20KHz 20 Hz 1 KHz 1 KHz OUTPUTFigure POWER (W) 5 OUTPUT POWER (W) Figure 6 Figure 5 Figure 6 Page 9 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 5 V Load = 8 ohms Gain = 20 dB BTL Mode THD + N (%) THD + N (%) VDD = 5.5 V Load = 4 ohms Gain = 20 dB BTL Mode 20KHz 20 Hz 20KHz 20 Hz 1 KHz 1 KHz Figure 8 OUTPUT POWER (W) OUTPUT POWER (W) Figure 7 Figure 8 CLOSED LOOP RESPONSE CLOSED LOOP RESPONSE Gain VDD = 5 V Load = 8 ohms Gain = 20 dB Po = 1W BTL Mode PHASE-Degress AMPLITUDE-dB Phase PHASE-Degress AMPLITUDE-dB Gain Phase VDD = 5 V Load = 8 ohms Gain = 6 dB Po = 1W BTL Mode FREQUENCY (Hz) FREQUENCY (Hz) Figure 9 Figure 10 Page 10 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL OUTPUT NOISE VOLTAGE vs. FREQUENCY CROSSTALK vs. FREQUENCY 20 dB Left to Right Right to Left OUTPUT NOISE VOLTAGE (uVrms) AMPLITUDE-dB VDD = 5 V Load = 8 ohms Po = 1 W Gain = 20 dB BTL Mode VDD = 5 V Load = 8 ohms BW = 22Hz to 22KHz A-weight BTL Mode 0 dB Figure 12 FREQUENCY (Hz) FREQUENCY (Hz) Figure 11 Figure 12 Page 11 V.0.1 Sep 12,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PACKAGE OUTLINE Unit : mm SM7516 12 PIN HDIP 19.10 ± 0.20 6.35 ± 0.20 10°max 7.62 TYP K K1 0.51 min 3.00 min 2.54 TYP BASE METAL J J1 3.30±0.20 WHITE PLATING 3.00 TYP 1.524 TYP MILLIMETERS 4.06 TYP Page 12 INCHES DIM MIN MAX MIN MAX J 0.219 0.339 0.0086 0.0133 J1 0.219 0.289 0.0086 0.0114 K 0.460 0.560 0.0181 0.0220 K1 0.460 0.510 0.0181 0.0201 V.0.1 Sep 12,2007