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 The SM7512 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. 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 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 * LCD Monitors * Portable DVD Player * 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. Pin Name I/O Function 1 ROUT- O 2 RPVDD - 3 RLINEIN I 4 VDD - 5 LLINEIN I Left channel line input 6 LPVDD - Supply voltage terminal for power stage 7 LOUT- O Left channel negative audio output 8 LPGND - Power ground 9 LOUT+ O Left chanel positive audio output 10 SHUTDOWN I 11 BYPASS I 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 12 GND - Analog power supply ground 13 VOLUME I Terminal for dc volume control.DC voltage range is 0 to VDD 14 SE/BTL I Output MUX control. When this terminal is high,SE outputs are selected. When this terminal is low, BTL outputs are selected 15 ROUT+ O Right channel positive audio output 16 RPGND - Power ground Right channel negative audio output Supply voltage terminal for power stage Right channel line input Supply voltage terminal 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 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 DISSIPATION RATING TABLE PACKAGE TA≤25°C Power Rating Derating Factor Above TA=25°C TA=70°C Power Rating TA=85°C Power Rating SOP /SSOP 2.7mW 21.8 mW/°C 1.7W 1.4W 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.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 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 - % - - 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% RL=8Ω, Measured between output and VDD RL=8Ω, 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 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.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL FUNCTIONAL BLOCK DIAGRAM RLINEIN _ _ + BYP ROUT+ + BYP _ ROUT- + BYP SE/BTL EN SE/BTL MUX Control PVDD Power Management VOLUME 32-Step Volume Control PGND VDD BYPASS SHUTDOWN AGND LLINEIN _ _ + BYP LOUT+ + BYP _ + LOUTEN BYP SE/BTL 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) 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 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 Cc 16 ROUT- RPGND PVDD ROUT+ Cs 2 VDD 15 VDD 100kΩ 3 Ci Right Line Audio Source 14 RLINEIN 1kΩ 100kΩ SE/BTL VDD Cs 4 Ci Left Line Audio Source VDD 5 6 7 8 13 VDD VOLUME In From DAC or Potentiometer (DC Voltage) Headphones 12 GND LLINEIN LPVDD LOUT- LPGND BYPASS SHUTDOWN LOUT+ 11 C(BYP) 10 System Control 9 Cc 1kΩ 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 _ _ + ROUT+ + BYP BYP VDD _ + ROUTEN SE/BTL BYP 100KΩ Co 330μF 1KΩ 100KΩ 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 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 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, 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 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 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 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 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 PHASE-Degress AMPLITUDE-dB Phase PHASE-Degress AMPLITUDE-dB Gain VDD = 5 V Load = 8 ohms Gain = 6 dB Po = 1W BTL Mode FREQUENCY (Hz) FREQUENCY (Hz) Figure 9 Figure 10 Page 11 V.1.4 Revised May 28,2007 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 12 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PACKAGE OUTLINE Unit : mm L SM7512S 16PIN SOP 1 8 H 9 E 16 0.381x45° D 0.203typ. 0.406 typ. 1.271 typ. D1 8 16 9 A A1 A2 E1 1 0.10max SYMBOLS A A1 D E H L θ° 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° THERMALLY ENHANCED DIMENSIONS PAD SIZE 95 x 18E E1 2.19 REF D1 4.12 REF NOTES: 1. JEDEC OUTLINE：N/A 2. DIMENSIONS “ D＂DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.MOLD FLASH PROTRUSIONS AND GATE BURRS SHALL NOT EXCEED 0.15mm PER SIDE. 3. DIMENSION “E＂DOES NOT INCLUDE INTER-LEAD FLASH, OR PROTRUSIONS. INTER-LEAD FLASH AND PROTRUSIONS SHALL NOT EXCEED 0.25mm PER SIDE. Page 13 V.1.4 Revised May 28,2007 SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL PACKAGE OUTLINE SM7512F 16PIN SSOP Unit : mm Thermal Pad (NOTE 5) E L 9 E1 16 C L1 D Gauge plane 0.2000 1 e b SYMBOLS A A1 A2 b C D E E1 e L y θ L1 MIN. 1.35 0.00 ― 0.20 0.19 4.80 5.80 3.80 ― 0.40 ― 0° 0.95 7°(4X) A A1 A2 8 y NOM. 1.50 ― 1.45 0.25 ― ― 6.0 3.9 0.64 ― ― ― 1.05 MAX. 1.65 0.10 ― 0.30 0.25 5.00 6.20 4.00 ― 1.27 0.10 8° 1.15 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 Marking Part Number ( Tape and Reel ) SOP-16 SM7512S SM7512S SSOP-16 SM7512F SM7512F Package Marking Lead Free Part Number SOP-16 SM7512SL SM7512SL SSOP-16 SM7512FL SM7512FL Package Marking Green Part Number SOP-16 SM7512SG SM7512SG SSOP-16 SM7512FG SM7512FG Lead Free Information Green Information Page 15 V.1.4 Revised May 28,2007