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| 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. 1007 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 : info@samhop.com.tw SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL GENERAL DESCRIPTION The SM7512 is a stereo audio power amplifier that drives 3 W/channel of continuous RMS power into a 3- 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. To simplify design, the speaker volume level is adjusted by applying a dc voltage to the VOLUME terminal. FEATURES * 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 * 3 W Into 3- Speakers APPLICATIONS * Notebook PC * LCD Monitors * Portable DVD Player PIN ASSIGNMENTS (TOP VIEW) * Digital photo frame ROUTRPVDD RLINEIN VDD LLINEIN LPVDD LOUTLPGND 1 2 3 4 5 6 7 8 Thermal Pad 16 15 14 13 12 11 10 9 RPGND ROUT+ SE/BTL VOLUME GND BYPASS SHUTDOWN LOUT+ SM7512 16PIN Page 1 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PIN ASSIGNMENTS ROUTRPVDD RLINEIN VDD LLINEIN LPVDD LOUTLPGND 1 2 3 4 5 6 7 8 Thermal Pad 16 15 14 13 12 11 10 9 RPGND ROUT+ SE/BTL VOLUME GND BYPASS SHUTDOWN LOUT+ SM7512 16PIN PIN DESCRIPTIONS No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name ROUTRPVDD RLINEIN VDD LLINEIN LPVDD LOUTLPGND LOUT+ SHUTDOWN BYPASS GND VOLUME SE/BTL ROUT+ RPGND I/O O I I O O I I I I O - Function Right channel negative audio output Supply voltage terminal for power stage Right channel line input Supply voltage terminal Left channel line input Supply voltage terminal for power stage Left channel negative audio output Power ground Left chanel positive audio output Places the amplifier in shutdown mode if a TTL logic low is placed on this terminal Tap to voltage divider for internal midsupply bias generator used for analog reference Analog power supply ground Terminal for dc volume control.DC voltage range is 0 to VDD Output MUX control. When this terminal is high,SE outputs are selected. When this terminal is low, BTL outputs are selected Right channel positive audio output Power ground Page 2 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL MAXIMUM RATINGS (Ta = 40~85oC) Characteristic Supply Voltage, VDD, PVDD Input Voltage Operating free-air temperature range Operaing junction temperature range Storage temperatuer range Continous total power dissipation Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds Symbol VSS VI TA TJ Tstg Rating -0.3 ~ 6 - 0.3 ~ VDD +0.3 - 40 ~ 85 - 40 ~ 150 - 65 ~ 150 See Dissipation Rating Table 260 o o o o Unit V V C C C C DISSIPATION RATING TABLE PACKAGE SOP /SSOP TA25C Power Rating 2.7mW Derating Factor Above TA=25C 21.8 mW/C TA=70C Power Rating 1.7W TA=85C Power Rating 1.4W RECOMMENDED OPERATING CONDITION Characteristic Supply Voltage, VDD, PVDD High-level input voltage VIH VIL Low-level input voltage VIL Operating free-air temperature TA SHUTDOWN -SHUTDOWN SE/BTL Symbol VSS VIH Condition -SE/BTL Min. 4.0 0.8 VDD 2.0 Typ. Max. 5.5 Unit V V - 0.3 VDD 0.6 85 -40 V o C Page 3 V.1.4 Revised May 28,2007 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 Output offset voltage (measured differentially) Power supply rejection ratio High-level input current (SE/BTL,SHUTDOWN,VOLUME) Low-level input current(SE/BTL,SHUTDOWN,VOLUME) Supply current, no load Symbol VOO PSRR llH llL Condition VDD=5.5V,Gain=20dB, SE/BTL=0V VDD=PVDD=4.0V to 5.5V VDD=PVDD=5.5V, Vl=VDD=PVDD VDD=PVDD=5.5V , Vl=0V 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=3, PO=2W,Stereo SHUTDOWN=0.0V Min. Typ. Max. 60 Unit mV dB uA uA -42 -70 1 1 10 6.0 5.5 3.0 8.0 5.0 1.5 1 lDD mA Supply current,max power into a 3 load Supply current,shutdown mode lDD lDD(SD) - 20 ARMS uA OPERATING CHARACTERISTICS (VDD =PVDD = 5V, RL = 3, Gain = 6dB, Ta = 25oC unless otherwise noted) Characteristic Symbol Condition f = 1KHz, RL =4, BTL Mode , Gain =20 dB Output Power (1) PO f = 1KHz, RL =8, BTL Mode , Gain =20 dB THD+N=1% THD+N=10% THD+N=1% THD+N=10% Min. Typ. 1.9 2.3 1.4 1.7 3 < 0.6 Max. Unit 2.65 600 400 2.85 W VDD=5.5V, f = 1KHz, THD+N =10% Total harmonic distortion+noise High-level output voltage Low-level output voltage Bypass voltage(Nominally VDD/2)(2) Noise output voltage THD+N VOH VOL V(BYPASS) PO =1W, RL=8, f=20Hz to 20kHz RL=8, Measured between output and VDD RL=8, Measured between output and GND Measured at pin 11, No load, VDD=5.5V f= 20 Hz to 20 kHz, Gain=0 dB, C(BYP)= 1.0 uF BTL % mV mV V VRMS 2.75 85 - - (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.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL FUNCTIONAL BLOCK DIAGRAM RLINEIN _ + BYP BYP _ + ROUT+ _ + BYP EN SE/BTL ROUT- SE/BTL MUX Control Power Management PVDD PGND VDD BYPASS SHUTDOWN AGND VOLUME 32-Step Volume Control LLINEIN _ + BYP BYP _ + LOUT+ _ + BYP SE/BTL EN LOUT- Page 5 V.1.4 Revised May 28,2007 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) 0.00 0.31 0.42 0.54 0.65 0.76 0.87 0.98 1.10 1.21 1.32 1.43 1.54 1.66 1.77 1.88 1.99 2.10 2.21 2.33 2.44 2.55 2.67 2.77 2.89 3.00 3.11 3.22 3.33 3.44 3.55 3.67 TO (V) 0.23 0.34 0.46 0.56 0.67 0.79 0.90 1.01 1.12 1.24 1.35 1.46 1.57 1.68 1.79 1.91 2.02 2.13 2.24 2.35 2.47 2.57 2.70 2.80 2.92 3.03 3.14 3.26 3.37 3.48 3.60 5.00 GAIN OF AMPLIFIER (Typ.) -85 -40 -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 Page 6 V.1.4 Revised May 28,2007 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 1 Cs VDD Ci VDD Cs 4 13 VDD VOLUME 12 LLINEIN GND 11 C(BYP) Cc 1k In From DAC or Potentiometer (DC Voltage) 16 ROUTRPGND 15 PVDD ROUT+ 14 RLINEIN SE/BTL 100k Cc 2 VDD 100k 1k Right Line Audio Source 3 Headphones Left Line Audio Source Ci 5 VDD 6 LPVDD BYPASS 7 LOUT- SHUTDOWN 10 System Control 8 LPGND LOUT+ 9 Left Speaker Figure 1. SM7512 Application Circuit Using Single-Ended Inputs and Input MUX Page 7 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL SE/BTL OPERATION The ability of the SM7512 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 SM7512, 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 SM7512 is in the BTL mode. When SE/BTL is held high, the OUT- amplifiers are in a high output impedance state, which configures the SM7512 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 _ + BYP BYP VDD _ + BYP EN SE/BTL ROUT100K _ + ROUT+ Co 330F 1K 100K LOUT+ Figure 2. SM7512 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 100K/1K divider pulls the SE/BTL input low. When a plug is inserted, the 1K 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 8 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL SHUTDOWN MODES The SM7512 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, IDD= 20A. 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) Closed loop response Crosstalk PSRR Power supply ripple rejection(BTL) vs Frequency vs Frequency vs Frequency vs Output power 3,4,5 6,7,8 9,10 11,12 13 Page 9 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL TOTAL HARMONIC DISTORTION + NOISE VS. FREQUENCY VDD = 5V Load = 4 ohms Po= 1.5 W BTL Mode TOTAL HARMONIC DISTORTION + NOISE VS. FREQUENCY VDD = 5V Load = 8 ohms Po = 1 W BTL Mode THD + N (%) 20dB 6dB THD + N (%) 20dB 6dB FREQUENCY (Hz) Figure 3 FREQUENCY (Hz) Figure 4 Figure 4 TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 4 V Load = 4 ohms Gain = 20 dB BTL Mode TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 5 V Load = 4 ohms Gain = 20 dB BTL Mode THD + N (%) 20KHz 20 Hz 1 KHz THD + N (%) 20KHz 20 Hz 1 KHz OUTPUT POWER (W) Figure 5 Figure 5 OUTPUT POWER (W) Figure 6 Figure 6 Page 10 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 5.5 V Load = 4 ohms Gain = 20 dB BTL Mode TOTAL HARMONIC DISTORTION + NOISE VS. OUTPUT POWER VDD = 5 V Load = 8 ohms Gain = 20 dB BTL Mode THD + N (%) 20KHz THD + N (%) 20KHz 20 Hz 1 KHz 20 Hz 1 KHz Figure 8 OUTPUT POWER (W) Figure 7 OUTPUT POWER (W) Figure 8 CLOSED LOOP RESPONSE CLOSED LOOP RESPONSE Gain Gain PHASE-Degress AMPLITUDE-dB AMPLITUDE-dB Phase Phase VDD = 5 V Load = 8 ohms Gain = 20 dB Po = 1W BTL Mode VDD = 5 V Load = 8 ohms Gain = 6 dB Po = 1W BTL Mode FREQUENCY (Hz) Figure 9 FREQUENCY (Hz) Figure 10 Page 11 V.1.4 Revised May 28,2007 PHASE-Degress SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL CROSSTALK vs. FREQUENCY VDD = 5 V Load = 8 ohms Po = 1 W Gain = 20 dB BTL Mode OUTPUT NOISE VOLTAGE vs. FREQUENCY 20 dB OUTPUT NOISE VOLTAGE (uVrms) AMPLITUDE-dB Left to Right Right to Left VDD = 5 V Load = 8 ohms BW = 22Hz to 22KHz A-weight BTL Mode 0 dB FREQUENCY (Hz) Figure 11 FREQUENCY (Hz) Figure 12 Figure 12 Page 12 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PACKAGE OUTLINE SM7512S 16PIN SOP D L Unit : mm 16 9 0.381x45 H E 1 1.271 typ. 8 0.406 typ. 0.203typ. D1 1 8 A2 A1 A 16 9 0.10max SYMBOLS A A1 D E H L MIN. 1.35 0.05 9.81 3.81 5.80 0.41 0 NOM. 1.75 0.15 10.02 4.0 6.20 1.27 8 NOTES: 1. JEDEC OUTLINEN/A 2. DIMENSIONS " DDOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.MOLD FLASH PROTRUSIONS AND GATE BURRS SHALL NOT EXCEED 0.15mm PER SIDE. 3. DIMENSION "EDOES NOT INCLUDE INTER-LEAD FLASH, OR PROTRUSIONS. INTER-LEAD FLASH AND PROTRUSIONS SHALL NOT EXCEED 0.25mm PER SIDE. THERMALLY ENHANCED DIMENSIONS PAD SIZE 95 x 18E E1 2.19 REF D1 4.12 REF Page 13 V.1.4 Revised May 28,2007 E1 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PACKAGE OUTLINE SM7512F 16PIN SSOP Unit : mm D Thermal Pad (NOTE 5) C L L1 16 9 E1 E Gauge plane 0.2000 1 8 A2 7(4X) e b y SYMBOLS A A1 A2 b C D E E1 e L y L1 MIN. 1.35 0.00 0.20 0.19 4.80 5.80 3.80 0.40 0 0.95 NOM. 1.50 1.45 0.25 6.0 3.9 0.64 1.05 A1 MAX. 1.65 0.10 0.30 0.25 5.00 6.20 4.00 1.27 0.10 8 1.15 A NOTES: 1. PACKAGE BODY SIZE EXCLUDE MOLD FLASH PROTRUSION OR GATE BURRS. 2. TOLERANCE 0.1mm UNLESS OTHERWISE SPECIFIED 3. DIMENSION L IS MEASURED IN GAGE PLANE 4. CONTROLLING DIMENSION IS MILLIMETER. CONVERTED INCH DIMENSION ARE NOT NECESSARILY EXACT. 5. DIE PAD EXPOSURE SIZE IS ACCORDING TO LEAD FRAME DESIGN 6. FOLLOWED FROM JEDEC MO-137 Page 14 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W AUDIO AMPLIFIER Ordering Information Package SOP-16 SSOP-16 Marking SM7512S SM7512F Part Number ( Tape and Reel ) SM7512S SM7512F Lead Free Information Package SOP-16 SSOP-16 Marking SM7512SL SM7512FL Lead Free Part Number SM7512SL SM7512FL Green Information Package SOP-16 SSOP-16 Marking SM7512SG SM7512FG Green Part Number SM7512SG SM7512FG Page 15 V.1.4 Revised May 28,2007 |
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