3/11/2002 LX1792 Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier INTEGRATED PRODUCTS P RELIMINARY S PECIFICATION KEY FEATURES 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 W W W. Microsemi .COM DESCRIPTION The LX1790 consists of a preamplifier The MSC-LX1792 offers a patent pending, low voltage, low power, and followed by a fixed gain class D amplifier. high efficiency amplifier for driving a The input resistor and feedback high impedance speaker such as a hearing resistor is external in the LX1792 making aid receiver. it possible to set the gain arbitrarily, up to The core of the amplifier is built upon approximately 40dB. The feedback Microsemi’s patented LX1790 class D resistor can also be potentiometer to facilitate volume control. amplifier. PRODUCT HIGHLIGHT CLOCK DIN PRE AMP Σ CMP HBRIDGE SPEAKER TJ (°°C) 10 to 55 Copyright 2001 Rev. 0.3,2002-03-11 LM Plastic MLPM 8-Pin LX1792CLM LX1792 PACKAGE ORDER INFO Plastic Dip N 14-Pin LX1792CN Bare Die LX1792 bare die Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 1 3/11/2002 LX1792 Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier INTEGRATED PRODUCTS P RELIMINARY S PECIFICATION PACKAGE PIN OUT 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. VSS 1 8 VDD OUTN 2 7 OUTP IMPSEL 3 6 PREOUT 4 5 IN LM PACKAGE (Top View) W W W. Microsemi .COM ABSOLUTE MAXIMUM RATINGS FUNCTIONAL PIN DESCRIPTION PIN NAME PIN NO 14 PIN DIP (EVALUATION SAMPLES) 8 DESCRIPTION PIN NO MLPM PIN VDD 13 8 Supply Voltage VSS 2 1 Ground IN 8 5 Analog Audio Input OUTP 14 7 Positive Output Voltage OUTN 1 2 Negative Output Voltage PREOUT 9 6 Pre amplifier output IMPSEL 6 3 Output Resistance Select. See Settings table below for selections. SETTINGS PIN IMPSEL=VSS IMPSEL=VDD IMPSEL=Floating IMPSEL 16Ω 24Ω 48Ω PACKAGE DATA Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 2 P 3/11/2002 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION Parameter Symbol Test Conditions Min LX1792 Typ Max Units OPERATING CONDITIONS Supply Voltage VDD Ground VSS 0.9 1.5 0 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, No load Parameter Symbol Switch Output Resistance @ Low Drive Switch Output Resistance @ Med Drive Switch Output Resistance @ High Drive Test Conditions Min LX1792 Typ ROUT-L 48 ROUT-M 24 ROUT-HI 16 Quiescent Current @ Low Drive IDDQL 110 Quiescent Current @ Med Drive IDDQM 120 Quiescent Current @ High Drive IDDQH 130 3dB Bandwidth – min Frequency FMIN 3dB Bandwidth – max Frequency FMAX 40 R1=50k, R2=1000k Max Units Ω 19 µA 100 Hz 50 KHz FCLK 200 KHz A1 R1=50k, R2=1000k 32 dB Power Supply Rejection Ratio PSRR Input Reference R1=50k, R2=1000k 45 dB Total Harmonic Distortion THD1 R1=50k, R2=1000k, Vin=5mVrms 0.3 % Input Referred Noise VN-20 R1=50k, R2=1000k, 100Hz-10kHz, No weighting 5 µV Output Switching Frequency Gain1 FCLK Output clock frequency Max absolute DC Offset OutN-OutP VOFF-NP No input signal W W W. Microsemi .COM RECOMMENDED OPERATING CONDITIONS 140 200 300 KHz 0 0.5 5 mV ELECTRICALS Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 3 3/11/2002 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION CHARTS W W W. Microsemi .COM CHARTS Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 4 3/11/2002 LX1792 Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier INTEGRATED PRODUCTS P RELIMINARY S PECIFICATION W W W. Microsemi .COM LX1790 H-bridge on impedance 30 Ron [Ohm] 25 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 Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 5 3/11/2002 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 C2 Battery 0.9-1.5 V IMPsel NC Volume cntrl potentiometer OUTP PREOUT R2 CIN OUTN VDD MSC-LX1792 VSS R1 IN Microphone SUGGESTED EXTERNAL APPLICATION COMPONENTS COMPONENT SUGGESTED VALUE CIN 100nF C2 R2 RX/CX Copyright 2001 Rev. 0.3,2002-03-11 Input AC coupling capacitor, must be present For best performance this should be as close as possible to the supply pins > 25k Ohm APPLICATION R1 Description 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. Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 6 3/11/2002 LX1792 Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier INTEGRATED PRODUCTS P RELIMINARY S PECIFICATION LM 8-Pin Plastic MLP-Micro Exposed Pad Dim A K J E B H I G C N F A B C D E F G H I J K 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 Internally Connected together, but isolated from all other terminals D 14-Pin Plastic Dip A Dim B 1 L J K G D SEATING PLANE M A B C D F G H J K L M MILLIMETERS MIN MAX 18.54 20.57 6.09 6.60 5.08 0.38 0.51 0.76 1.52 2.54 BSC 1.27 2.28 0.20 0.38 3.18 7.62 BSC 15° INCHES MIN MAX 0.730 0.810 0.240 0.260 0.200 0.015 0.020 0.030 0.060 0.100 BSC 0.050 0.090 0.008 0.015 0.125 0.300 BSC 15° MECHANICAL C F H W W W. Microsemi .COM MECHANICAL – 8 PIN MLPQ PACKAGE OUTLINE 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. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 7 3/11/2002 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION MECHANICALS 7-PIN BARE DIE X Y MILLIMETERS MIN MAX 1.15 1.78 INCHES MIN MAX 0.045 0.070 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. W W W. Microsemi .COM Dim MECHANICAL Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 8 3/11/2002 LX1792 INTEGRATED PRODUCTS Low Voltage, Low Power, AudioMite™ Class-D Audio Amplifier P RELIMINARY S PECIFICATION NOTES W W W. Microsemi .COM NOTES Copyright 2001 Rev. 0.3,2002-03-11 Microsemi INTEGRATED PRODUCTS 5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541 Page 9