LM4840MT/NOPB

OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 LM4840 Boomer® Audio Power Amplifier Series Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux Check for Samples: LM4840 FEATURES DESCRIPTION • • • • The LM4840 is a monolithic integrated circuit that provides digital volume control and stereo bridged audio power amplifiers capable of producing 2W into 4Ω with less than 1.0% THD or 2.2W into 3Ω with less than 1.0% THD (see (1) (2) below). 1 23 • • • • • PC98 and PC99 Compliant Digital Volume Control Interface System Beep Detect Stereo Switchable Bridged/Single-ended Power Amplifiers “Click and Pop” Suppression Circuitry Thermal Shutdown Protection Circuitry Input Mux Capless Headphone Drivers Last Volume Memory From Shutdown APPLICATIONS • • • Portable and Desktop Computers Multimedia Monitors Portable Radios, PDAs, and Portable TVs Boomer® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4840 incorporates a digital volume control, stereo bridged audio power amplifiers, an input mux, and a last volume level memory function to save the volume setting during shutdown. These features make it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications. The LM4840 features an externally controlled, lowpower consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance. KEY SPECIFICATIONS • • • PO at 1% THD+N – Into 3Ω (LM4840LQ, LM4840MH): 2.2W (typ) – Into 4Ω (LM4840LQ, LM4840MH): 2.0W (typ) – Into 8Ω (LM4840): 1.1W (typ) Single-Ended Mode - THD+N at 85mW into 32Ω: 1.0% (typ) Shutdown Current: 0.2μA (typ) (1) (2) When properly mounted to the circuit board, the LM4840LQ and LM4840MH will deliver 2W into 4Ω. The LM4840MT will deliver 1.1W into 8Ω. See the APPLICATION INFORMATION section LM4840LQ and for LM4840MH usage information. An LM4840LQ and LM4840MH that have been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω. 1 2 3 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Boomer is a registered trademark of Rockford Corporation. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2001–2013, Texas Instruments Incorporated OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. CONNECTION DIAGRAM WQFN Package (Top View) See Package Number NJB0028A for LM8480LQ TSSOP Package (Top View) See Package Number PW0028A TSSOP for LM4840MT See Package Number PWP0028A for TSSOP (Exposed Pad) for LM4840MH 2 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 BLOCK DIAGRAM Figure 1. LM4840 Block Diagram Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 3 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) (2) Supply Voltage 6.0V Storage Temperature -65°C to +150°C −0.3V to VDD +0.3V Input Voltage Power Dissipation ESD Susceptibility Internally limited (3) 2000V ESD Susceptibility (4) 200V Junction Temperature 150°C Soldering Information Small Outline Package Vapor Phase (60 sec.) 215°C Infrared (15 sec.) 220°C See AN-1187 “Leadless Leadframe Package” for detailed information on usage of WQFN devices. θJC (typ)—NJB0028A (5) 3°C/W θJA (typ)—NJB0028A (5) 42°C/W θJC (typ)—PW0028A 20°C/W θJA (typ)—PW0028A 80°C/W θJC (typ)—PWP0028A 2°C/W (6) 41°C/W θJA (typ)—PWP0028A (7) 54°C/W θJA (typ)—PWP0028A (8) 59°C/W θJA (typ)—PWP0028A (9) 93°C/W θJA (typ)—PWP0028A (1) (2) (3) (4) (5) (6) (7) (8) (9) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine Model, 220 pF–240 pF discharged through all pins. Number given is for an NJB0028A package whose exposed-DAP is soldered to an exposed 2.5in2 piece of 1 ounce PCB copper. The θJA given is for an PWP0028A package whose exposed-DAP is soldered to a 2in2 piece of 1 ounce printed circuit board copper on a bottom side layer through 21 8mil vias. The θJA given is for an PWP0028A package whose exposed-DAP is soldered to an exposed 2in 2 piece of 1 ounce printed circuit board copper. The θJA given is for an PWP0028A package whose exposed-DAP is soldered to an exposed 1in 2 piece of 1 ounce printed circuit board copper. The θJA given is for an PWP0028A package whose exposed-DAP is not soldered to any copper. OPERATING RATINGS Temperature Range TMIN ≤ TA ≤TMAX −40°C ≤TA ≤ 85°C 2.7V≤ VDD ≤ 5.5V Supply Voltage 4 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS FOR ENTIRE IC (1) (2) The following specifications apply for VDD = 5V unless otherwise noted. Limits apply for TA = 25°C. LM4840 Symbol Parameter Conditions Typical Limit (3) VDD (4) Supply Voltage Units (Limits) 2.7 V (min) 5.5 V (max) mA (max) IDD Quiescent Power Supply Current VIN = 0V, IO = 0A 12 30 ISD Shutdown Current VSHUTDOWN = VDD 0.7 2.0 VIH Headphone Sense High Input Voltage 4 V (min) VIL Headphone Sense Low Input Voltage 0.8 V (max) (1) μA (max) All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown in Figure 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. Typicals are specified at 25°C and represent the parametric norm. Datasheet min/max specification limits are specified by design, test, or statistical analysis. (2) (3) (4) ELECTRICAL CHARACTERISTICS FOR VOLUME ATTENUATORS (1) (2) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4840 Symbol Parameter Typical Limit (4) Units (Limits) 0 ±0.5 dB (max) Attenuation with Digital Volume Min -81 -75 dB (min) VMUTE = VDD, Bridged Mode -88 -78 dB (min) VMUTE = VDD, Single-Ended Mode -88 -78 dB (min) Conditions (3) CRANGE Attenuator Range AM Mute Attenuation (1) Gain with Digital Volume Max All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown in Figure 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. Typicals are specified at 25°C and represent the parametric norm. Datasheet min/max specification limits are specified by design, test, or statistical analysis. (2) (3) (4) ELECTRICAL CHARACTERISTICS FOR SINGLE-ENDED MODE OPERATION (1) (2) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4840 Symbol Parameter Conditions Typical (3) PO Output Power THD+N (1) (2) (3) (4) Total Harmonic Distortion+Noise Limit (4) Units (Limits) THD = 1.0%; f = 1kHz; RL = 32Ω 85 mW THD = 10%; f = 1 kHz; RL = 32Ω 95 mW 0.065 % VOUT = 1VRMS, f=1kHz, RL = 10kΩ, AVD =1 All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown in Figure 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. Typicals are specified at 25°C and represent the parametric norm. Datasheet min/max specification limits are specified by design, test, or statistical analysis. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 5 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS FOR SINGLE-ENDED MODE OPERATION(1)(2) (continued) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4840 Symbol Parameter Conditions Typical (3) Limit (4) Units (Limits) PSRR Power Supply Rejection Ratio CB = 1.0 μF, f =120 Hz, VRIPPLE = 200 mVrms 58 dB SNR Signal to Noise Ratio POUT =75 mW, R L = 32Ω, A-Wtd Filter 102 dB Xtalk Channel Separation f=1kHz, CB = 1.0 μF 65 dB ELECTRICAL CHARACTERISTICS FOR BRIDGED MODE OPERATION (1) (2) The following specifications apply for VDD = 5V, unless otherwise noted. Limits apply for TA = 25°C. LM4840 Symbol Parameter Conditions Typical Limit (4) Units (Limits) 5 50 mV (max) (3) VOS Output Offset Voltage PO Output Power VIN = 0V, No Load THD + N = 1.0%; f=1kHz; RL = 3Ω (5) 2.2 THD + N = 1.0%; f=1kHz; RL = 4Ω (6) 2 W W THD = 1.5% (max);f = 1 kHz; RL = 8Ω 1.1 1.0 W (min) THD+N = 10%;f = 1 kHz; RL = 8Ω 1.5 W PO = 1W, 20 Hz< f < 20 kHz, RL = 8Ω, AVD = 2 0.3 % THD+N Total Harmonic Distortion+Noise PO = 340 mW, RL = 32Ω 1.0 % PSRR Power Supply Rejection Ratio CB = 1.0 µF, f = 120 Hz, VRIPPLE = 200 mVrms; RL = 8Ω 74 dB SNR Signal to Noise Ratio VDD = 5V, POUT = 1.1W, RL = 8Ω, AWtd Filter 93 dB Xtalk Channel Separation f=1kHz, CB = 1.0 μF 70 dB (1) (2) (3) (4) (5) (6) 6 All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown in Figure 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. Typicals are specified at 25°C and represent the parametric norm. Datasheet min/max specification limits are specified by design, test, or statistical analysis. When driving 3Ω loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board and forced-air cooled. When driving 4Ω loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 MH AND LQ SPECIFIC CHARACTERISTICS LM4840MH, LM4840LQ THD+N vs Output Power LM4840MH, LM4840LQ THD+N vs Frequency Figure 2. Figure 3. LM4840MH, LM4840LQ THD+N vs Output Power LM4840MH, LM4840LQ THD+N vs Frequency Figure 4. Figure 5. LM4840MH, LM4840LQ Power Dissipation vs Output Power Figure 6. (1) LM4840MH Power Derating Curve (1) Figure 7. These curves show the thermal dissipation ability of the LM4840MH at different ambient temperatures given these conditions: 500LFPM + 2in2: The part is soldered to a 2in2, 1 oz. copper plane with 500 linear feet per minute of forced-air flow across it. 2in2on bottom: The part is soldered to a 2in2, 1oz. copper plane that is on the bottom side of the PC board through 21 8 mil vias. 2in2: The part is soldered to a 2in2, 1oz. copper plane. 1in2: The part is soldered to a 1in2, 1oz. copper plane. Not Attached: The part is not soldered down and is not forced-air cooled. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 7 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS 8 THD+N vs Frequency THD+N vs Frequency Figure 8. Figure 9. THD+N vs Frequency THD+N vs Frequency Figure 10. Figure 11. THD+N vs Frequency THD+N vs Frequency Figure 12. Figure 13. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) THD+N vs Frequency THD+N vs Frequency Figure 14. Figure 15. THD+N vs Frequency THD+N vs Frequency Figure 16. Figure 17. THD+N vs Frequency THD+N vs Output Power Figure 18. Figure 19. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 9 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 10 THD+N vs Output Power THD+N vs Output Power Figure 20. Figure 21. THD+N vs Output Power THD+N vs Output Power Figure 22. Figure 23. THD+N vs Output Power THD+N vs Output Power Figure 24. Figure 25. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) THD+N vs Output Power THD+N vs Output Power Figure 26. Figure 27. THD+N vs Output Power THD+N vs Output Power Figure 28. Figure 29. Output Power vs Load Resistance Output Power vs Load Resistance Figure 30. Figure 31. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 11 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 12 Output Power vs Load Resistance Power Supply Rejection Ratio Figure 32. Figure 33. Dropout Voltage Output Power vs Load Resistance Figure 34. Figure 35. Noise Floor Noise Floor Figure 36. Figure 37. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 38. Figure 39. Power Derating Curve Crosstalk Figure 40. Figure 41. Crosstalk Output Power vs Supply voltage Figure 42. Figure 43. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 13 OBSOLETE LM4840 SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Output Power vs Supply Voltage Figure 44. 14 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM4840 OBSOLETE LM4840 www.ti.com SNAS127C – SEPTEMBER 2001 – REVISED APRIL 2013 APPLICATION INFORMATION DIGITAL VOLUME CONTROL The LM4840 features a digital volume control which consists of the CLOCK, UP, and DOWN pins. An external clock may be fed to the CLOCK pin, or, by connecting a capacitor from the CLOCK pin to ground, the internal clock may be used. The internal clock frequency with respect to this capacitor value is determined from the following formula: fCLK = (7.338 x 10-7 ) / C When using an external clock, the clock is buffered and the internal clock frequency is that of the external clock divided by 2. Also, the maximum frequency should be kept below 100kHz. Volume changes are then effected by toggling either the UP or DOWN pins with a logic high. After a period of 4 clock pulses with either the UP or DOWN pins held high, the volume will change to the next specified step, either up or down. Volume levels for each step vary and are specified in Table 2. If either the UP or DOWN pin remains high after the first volume transition the volume will change again, but this time after 40 clock pulses. The next transition occurs at 20 clock pulses, then 12, then 8, and from then on 4 clock pulses for each volume transtition. This cycle is shown in the timing diagram shown in Figure 46. Releasing the held UP or DOWN pin to ground at any time re-starts the cycle. This is intended to provide the user with a volume control that pauses briefly after initial application, then slowly increases the rate of volume change as it is continuously applied. If both the UP and DOWN pins are held high, no volume change will occur. Trigger points for the UP and DOWN pins are at 60% of VDD minimum for a logic high, and 20% of VDD maximum for a logic low. It is recommended, however, to toggle UP and DOWN between VDD and GND for best performance. When using an external clock, clock pulses should be a minimum 0f 3V for a high and maximum of 0.9V for a low when using a 5V supply. Again, pulsing an external clock from VDD to GND ensures reliable performance. Following these guidelines the volume may then be changed with a microcontroller or manually using switches. MEMORY FUNCTION The LM4840 features a volume memory that saves the last volume setting when power is turned off. This requires that an auxiliary power source be connected to VAUX through a diode as shown in Figure 1. Connecting the circuit as shown also provides that power to the VAUX pin is being drawn from VDD when VDD is on and is greater than VAUX. VAUX must be at a voltage of 2.3V or greater to maintain volume memory when VDD is absent. This feature is intended for such applications as laptop computers, where VDD is the system power and VAUX is connected to the real time clock battery. The default volume setting for the LM4840 is -10dB in BTL mode, and 16dB in single-ended mode. This default setting is only achieved on power up when both VDD and VAUX had both been turned off, and the circuit had sufficient time to discharge (