LX1792CDU

LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION DESCRIPTION KEY FEATURES W W W. Microsemi . COM The MSC-LX1792 offers a patent pending, low voltage, low power, and high efficiency amplifier for driving a high impedance speaker such as a hearing aid receiver. The core of the amplifier is built upon Microsemi’s patented LX1790 class D amplifier. The LX1790 consists of a preamplifier followed by a fixed gain class D amplifier. The input resistor and feedback resistor is external in the LX1792 making it possible to set the gain arbitrarily, up to approximately 40dB. The feedback resistor can also be potentiometer to facilitate volume control. ! Low Operating Current: 120µA Typical ! Low Operating Voltage: 0.9V minimum ! Gain set by external resistors ! 3 Output Switch Resistance Settings: 48, 24 & 16 Ω ! 5uVrms input referred noise. APPLICATIONS ! Hearing Aid applications ! High impedance speaker /Transducer applications IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT CLOCK DIN PRE AMP Σ CMP HBRIDGE SPEAKER PACKAGE ORDER INFO LX1792 LX1792 TJ (°C) 10 to 55 J Ceramic Dip 14-Pin LX1792CJ LM Plastic MLPM 8-Pin LX1792CLM DU Plastic MSOP 8-Pin LX1792CDU BD Bare Die LX1792BD Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 1 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION ABSOLUTE MAXIMUM RATINGS Input Logic Supply Voltage (VDD).......................................-0.3V to +3.0V Operating Temperature Range ................................................10°C to 55°C Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. PACKAGE PIN OUT W W W. Microsemi . COM VSS OUTN IMPSEL 1 2 3 4 8 7 6 5 LM PACKAGE (Top View) VDD OUTP PREOUT IN VSS OUTN IMPSEL 1 2 3 4 8 7 6 5 DU PACKAGE (Top View) VDD OUTP PREOUT IN SETTINGS PIN IMPSEL IMPSEL=VSS 16Ω IMPSEL=VDD 24Ω IMPSEL=Floating 48Ω OUTN VSS 1 2 3 4 5 14 13 12 11 10 9 8 (Top View) OUTP VDD 1 6 7 IMPSEL PREOUT IN J PACKAGE FUNCTIONAL PIN DESCRIPTION PIN NAME VDD VSS IN OUTP OUTN PREOUT IMPSEL PIN NO 14 PIN J PIN NO 8 PIN LM PIN NO 8 PIN DU 8 1 5 7 2 6 3 Supply Voltage Ground Analog Audio Input Positive Output Voltage Negative Output Voltage Pre amplifier output Output Resistance Select. See Settings table below for selections. DESCRIPTION (EVALUATION SAMPLES) PACKAGE DATA PACKAGE DATA 13 2 8 14 1 9 6 8 1 5 7 2 6 3 Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 2 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION RECOMMENDED OPERATING CONDITIONS Parameter Symbol Test Conditions Min 0.9 0 LX1792 Typ Max 1.5 Units W W W. Microsemi . COM ! OPERATING CONDITIONS Supply Voltage Ground VDD VSS V V ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature TA=25°C except where otherwise noted. Test conditions: VDD=1.3V, VSS=0V, Circuit connected as application schematic on page 5,Output loaded with 200Ohm in series with 60mH. Parameter Switch Output Resistance @ Low Drive Switch Output Resistance @ Med Drive Switch Output Resistance @ High Drive Quiescent Current @ Low Drive Quiescent Current @ Med Drive Quiescent Current @ High Drive 3dB Bandwidth – min Frequency 3dB Bandwidth – max Frequency Output Switching Frequency Gain1 Power Supply Rejection Ratio Total Harmonic Distortion Input Referred Noise Output clock frequency Max absolute DC Offset OutN-OutP () Symbol ROUT-L ROUT-M ROUT-HI IDDQL IDDQM IDDQH FMIN FMAX FCLK A1 PSRR THD1 VN-20 No load Test Conditions Min LX1792 Typ 48 24 16 110 120 130 Max Units Ω 19 µA R1=50k, R2=1000k, Fin=1kHz 10 40 100 Hz KHz 200 32 37 45 0.3 0.5 4 3 140 200 0.5 300 5 0 KHz dB dB % µVrms KHz mV R1=50k, R2=500k R1=25k, R2=500k Input Reference R1=50k, R2=500k R1=50k, R2=500k, Vin=5mVrms, Fin=1kHz R1=25k, R2=500k, Vin=5mVrms, Fin=1kHz R1=50k, R2=500k, 100Hz-10kHz, No weighting R1=25k, R2=500k, 100Hz-10kHz, No weighting No input signal FCLK VOFF-NP E ELECTRICALS Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 3 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION CHARTS W W W. Microsemi . COM Note: Graphs show distortion with no load outputs CHARTS CHARTS Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 4 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION CHARTS (CONTINUED) W W W. Microsemi . COM LX1790 H-bridge on impedance 30 25 Ron [Ohm] 20 15 10 5 0 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 Supply voltage Figure 2 – H-Bridge Impedance vs. Supply Voltage (Lowest Impedance Setting) CHARTS CHARTS Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 5 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION W W W. Microsemi . COM APPLICATION SCHEMATIC Transducer/Speaker Battery 0.9-1.5 V C2 VSS VDD OUTN MSC-LX1792 OUTP Volume cntrl potentiometer CIN R1 R2 IMPsel PREOUT NC IN Microphone SUGGESTED EXTERNAL APPLICATION COMPONENTS Component Suggested value Description CIN C2 R1 R2 RX/CX 100nF > 25k Ohm Input AC coupling capacitor, must be present For best performance this should be as close as possible to the supply pins Input resistor > 25k Ohms Preamplifier feedback resistor If the audio source (for example a microphone) has a low power supply rejection an additional filter for the supply to this have to be added. APPLICATION APPLICATION Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 6 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION MECHANICAL – 8 PIN MLPQ PACKAGE OUTLINE W W W. Microsemi . COM LM 8-Pin Plastic MLP-Micro Exposed Pad A K J B E H I G Dim A B C D E F G H I J K F MILLIMETERS MIN MAX 2.90 3.10 2.90 3.10 0.65 0.75 0.15 0.25 1.841 BSC 0.27 0.43 0.65 BSC 1.22 BSC 0 0.10 0.21 0.37 0 0.10 INCHES MIN MAX 0.114 0.122 0.114 0.122 0.025 0.029 0.005 0.009 0.075 BSC 0.010 0.016 0.025 BSC 0.048 BSC 0 0.003 0.008 0.014 0 0.003 C D Internally Connected together, but isolated from all other terminals J 14-Pin Ceramic Dip A Dim B 1 L C F J K H G D A B C D F G H J K L M M MILLIMETERS MIN MAX 19.30 19.94 5.59 7.11 5.08 0.38 0.51 1.02 1.77 2.54 BSC 2.03 0.20 0.38 3.18 5.08 7.37 7.87 15° INCHES MIN MAX 0.760 0.785 0.220 0.280 0.200 0.015 0.020 0.040 0.070 0.100 BSC 0.080 0.008 0.015 0.125 0.200 0.290 0.310 15° MECHANICAL MECHANICAL Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 7 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION MECHANICALS 7-PIN BARE DIE W W W. Microsemi . COM DU A 8-Pin MSOP Dim A B C D G H J K L M N P MILLIMETERS MIN MAX 2.85 3.05 2.90 3.10 – 1.10 0.25 0.40 0.65 BSC 0.38 0.64 0.13 0.18 0.95 BSC 0.40 0.70 3° 0.05 0.15 4.75 5.05 INCHES MIN MAX .112 .120 .114 .122 – 0.043 0.009 0.160 0.025 BSC 0.015 0.025 0.005 0.007 0.037 BSC 0.016 0.027 3° 0.002 0.006 0.187 0.198 B H G P M C N K D L Dim X Y Note: MILLIMETERS MIN MAX 1.15 1.78 INCHES MIN MAX 0.045 0.070 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. MECHANICAL MECHANICAL Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 8 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION NOTES W W W. Microsemi . COM NOTES NOTES Preliminary Data – Information contained in this document is pre-production data and is proprietary to Microsemi. It may not be modified in any way without the express written consent of Microsemi. Product referred to herein is offered in sample form only and Microsemi reserves the right to change or discontinue this proposed product at any time. Copyright  2001 Rev. 0.3,2002-05-08 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 9