![]() |
|
If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
Datasheet File OCR Text: |
LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET DESCRIPTION KEY FEATURES No Output Filter Required Low EMI Design Low Quiescent Current: 4mA Low Shutdown Current: 1A Wide Supply Voltage Range: 2.5-5.5 Volt 1W Output Power into 8 Load with THD<1% @ 5.0V THD+N as low as 0.1% Small Form Factor...16-pin MLP Package only 4x4mm Built-in Clock Frequency Built-in Feedback Loop, Keep High Audio Fidelity Fixed 20dB Gain Full 20-20KHz Audio Bandwidth Shutdown Function Internal Thermal Shutdown High Efficiency: over 85% through Modulation Scheme and Class-D Operation Built-in De-Pop Circuit APPLICATIONS PVDD The LX1702 family represents a new generation of a fully integrated audio stereo class-D amplifier from Microsemi. This CMOS stereo class-D amplifier series is optimized for low voltage, low power operation and minimum system cost. The products are ideal for use in battery powered applications where low power consumption is desirable such as portable speakers, DVDs, PMP, and other low power systems. The LX1702 family provides very low quiescent current consumption through the use of a proprietary output modulation scheme. This technology enables filterless operation in many applications. The LX1702 features on board, low Rdson, complementary output MOSFET's that reduces the need for external components. The LX1702 is offered in a small footprint, low profile, 4mm x 4mm 16pin MLPQ. WWW .Microsemi .C OM IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com PRODUCT HIGHLIGHT Speaker Out 1 PVDD PVSS1 VDD IN1+ IN1- OUT1+ PVDD1 OUT1- PVSS3 OUT2- VDD IN1+ IN1IN2+ VSS IN2- PVDD2 Part LX1702 OUT2+ PVSS2 EN Speaker Out 2 Portable Speakers Portable DVD PMP / PMC Notebook PC IN2IN2+ ENABLE PACKAGE ORDER INFO TA (C) 0 to 70 LQ Plastic MLPQ 4mm x 4mm 16-Pin RoHS Compliant / Pb-free LX1702 LX1702 LX1702CLQ Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1702CLQ-TR) Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET ABSOLUTE MAXIMUM RATINGS Positive Supply Voltage (VDD, PVDD) ........................................................... -0.3 to 6.5V Analog Input Voltage (IN1+, IN1-, IN2+, IN2-).................................. -0.3 to VDD + 0.3V Digital Input Voltage (EN, MUTE) ..................................................... -0.3 to VDD + 0.3V Operating Temperature Range (TA) ................................................................0C to +70C Maximum Operating Junction Temperature (TJ) ....................................................... 150C Storage Temperature Range.........................................................................-65C to 150C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260C (+0 -5) 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 WWW .Microsemi .C OM PVDD1 OUT1+ 16 15 14 PVSS1 VDD IN1+ IN1- PVSS3 13 12 11 OUT1- 1 2 3 4 5 6 7 8 OUT2PVDD2 OUT2+ PVSS2 e 10 9 THERMAL DATA LQ PACKAGE (Top View) LQ Plastic MLPQ 16-Pin 4mm x 4mm 24.6C/W RoHS / Pb-free 100% Matte Tin Lead Finish THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. FUNCTIONAL PIN DESCRIPTION Name VSS IN1IN1+ EN IN2IN2+ VDD PVSS1 PVSS2 PVSS3 OUT1+ PVDD1 & PVDD2 OUT1OUT2+ OUT2Negative supply to analog stage (ground) Negative audio input channel 1 Positive audio input channel 1 Enable pin, active high Negative audio input channel 2 Positive audio input channel 2 Analog positive power supply Negative supply to Negative output stage (ground) for channel1 Description IN2+ VSS IN2- EN PACKAGE DATA PACKAGE DATA Positive audio (PWM) output for channel 1 Positive supply to Positive output stage for channel 1 Negative audio (PWM) output for channel 1 Positive audio (PWM) output channel 2 Negative audio (PWM) output channel 2 Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET SYSTEM CHARACTERISTICS The following specifications apply over the operating ambient temperature 0 < TA < 70C except where otherwise noted and the following test conditions: PVDD = VDD = 5.0V, PVSS = VSS = 0V, RL = 8 Parameter Supply Current: Quiescent Supply Current: Shutdown Mode Output Power @ 8 Ohms Power Efficiency Total Harmonic Distortion @ 50% of Maxim Power Signal To Noise Ratio Output Noise Floor Frequency Response Lower Corner Frequency Frequency Response Power Supply Rejection Ratio Common Mode Rejection Ratio Gain PSRR CMRR GSYS WWW .Microsemi .C OM Symbol IQQ IQQSD PQ THD_N SNR VN FLO Test Conditions No Load Disable Pin Active VDD = PVDD = 5V, Fin THD+N = 1% = 1kHz THD+N = 10% THD+N = 1% VDD = PVDD = 3.3V, Fin = 1kHz THD+N = 10% VDD = PVDD = 5V, Fin = 1kHz VDD = PVDD = 5V, Fin = 1kHz, RL = 8 VDD = PVDD = 5V, F = 1kHz, PO = 0.5W, A-weighted Input Grounded A-weighted 20 to 20kHz 3dB relative to 1kHz VDD = PVDD = 2.5 to 5.5V, RL = 8, PO = 200mW @ 20 ~ 80kHz, Filter less Input Reffered, VDD = PVDD = 2.5V to 5.5V VDD = PVDD = 2.5V to 5.5V Min LX1702 Typ 2.5 1.2 1.6 0.45 0.6 85 0.1 90 100 Max 5 1 Units mA A W % % dB VRMS 20 20K 3 Hz dB dB dB dB 55 55 60 60 20 ELECTRICALS ELECTRICALS Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET ELECTRICAL CHARACTERISTICS The following specifications apply over the operating ambient temperature 0 < TA < 70C except where otherwise noted and the following test conditions: PVDD = VDD = 5.0V, PVSS = VSS = 0V, RL = 8 Parameter Supply Voltage Oscillator Frequency Supply Current: Quiescent Supply Current: Shutdown Mode Power Supply Rejection Ratio Input Resistance Output DC Offset WWW .Microsemi .C OM Symbol Test Conditions Min 2.5 LX1702 Typ 200 2.5 2 0.5 60 18 400 400 550 550 Max 5.5 5 4 2 +50 Units V kHz mA A dB K mV Static Drain-to-Source ONResistance Stage Gain Thermal Junction Shutdown Thermal Shutdown Hysteresis Enable Threshold Under Voltage Threshold Level VDD PVDD fSW VDD = PVDD = 2.5 ~ 5.5V VDD = PVDD = 5V No Load IQQ VDD = PVDD = 3.3V IQQSD Disable Pin Active PSRR VDD = PVDD = 2.5V to 5.5V RIN VDD = PVDD = 2.5V ~ 5.5V Single Ended VOFF Input Shorted to GND P Channel VDD = PVDD = 5V N Channel P Channel VDD = PVDD = 3.3V RDSON N Channel P Channel VDD = PVDD = 2.5V N Channel GH VDD = PVDD = 2.5V to 5.5V TJ EN VDD 55 -50 m 900 900 11 2.4 2.2 9 2.1 1.8 10 150 25 2.25 2.0 V/V C C V V SIMPLIFIED BLOCK DIAGRAM Triangle Wave Generator LX1702 PVDD2 PVDD1 DRIVER VINP VINN Dynamic Pulse Generation DRIVER OUTP OUTN PVSS1 ELECTRICALS ELECTRICALS VDD VSS De-pop signal ground Generation LP PVSS2 LP EN Figure 1 - LX1702 Simplified Block Diagram (Half Circuit) Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET SYSTEM TEST SETUP WWW .Microsemi .C OM Power Supply - + VBAT GND C1 2nd Order RC LPF TP1OUT1- Input1Audio Precision System One GND Input1+ Input2- Output1Audio Precision System One Output1+ Output2- IN1- OUT1+ IN1+ IN2LX1702 2nd Order RC LPF 2nd Order RC LPF TP1+ TP2OUT2IN2+ OUT2+ 2nd Order RC LPF TP2+ Output2+ Input2+ LX1702 Evaluation Kit Figure 2 - Typical Evaluation Test Setup Circuit Default Settings: Equipments: Audio Precision SYSTEM 1 Oscilloscope, Power Supply ~ +5V; Supply Voltage: 2.5V / 3.3V / 5.0V 3 corner voltages On-Board passive LPF: 40kHz cut off frequency (-6dB) AP settings: 10Hz ~ 22KHz BPF APPLICATIONS APPLICATIONS Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET APPLICATION CIRCUITS WWW .Microsemi .C OM R1 470 R2 470 TP9 C12 4700pF C11 2200pF For Test Purposes Only TB2 OUTR+ OUTR- R3 470 TP1 TB1 +VIN RTN C1 47F VIN C7 1F TP6 TP5 C19 4700pF R4 470 TP10 C10 2200pF For Test Purposes Only TP2 OUT1- OUT1+ C2 1F J1 C3 0.47F JP1 INR+ INRJ2 C5 0.47F JP2 INL+ INLC4 0.47F PVDD1 PVSS3 TP7 R5 470 VIN C14 4700pF TP8 R6 470 PVSS1 VDD IN1+ IN1- OUT2- TP11 LX1702 Part IN2+ PVDD2 OUT2+ PVSS2 C8 1F C13 2200pF For Test Purposes Only VSS IN2- EN TB3 TP1 C6 0.47F VIN ENABLE TP4 OUTLOUTL+ APPLICATIONS APPLICATIONS R7 470 R8 470 TP12 C15 4700pF C16 2200pF For Test Purposes Only Figure 3 - Typical LX1702 Application Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET FUNCTIONAL DESCRIPTION WWW .Microsemi .C OM GENERAL DESCRIPTION The LX1702 is a filterless, low-EMI, class-D audio power amplifier. It offers high performance (THD+N is just 0.1% @ 1W), high efficiency (>85% @ 0.6W), and best in class EMI radiation (just 20dBV/m). The internal signal path is completely differential to minimize commonmode noise pickup. The inputs may be driven single-ended or differentially and they may be direct or AC coupled. The LX1702 may be operated with just a single decoupling capacitor. FILTERLESS 3-LEVEL CLASS-D MODULATION The LX1702 output stage is configured as a full H-bridge push-pull driver. The speaker must be driven differentially from the OUTP and OUTN pins. Each side of the speaker is driven by a 200KHz switching signal that transitions between VDD and GND. With zero input voltage, the duty cycle at each output is around 50% and the signals are inphase with each other. In this case, there is basically no differential voltage across the speaker. When the input signal goes positive, the duty cycle at OUTP increases above 50% and the duty cycle at OUTN decreases below 50%. This causes a net positive current to flow into the speaker. A negative input voltage causes the OUTN duty cycle to increase and the OUTP duty cycle to decrease which causes a net negative current to flow into the speaker. The differential voltage across the speaker has a fundamental frequency of twice the 200KHz switching frequency. The speaker itself serves as the low pass filter which then recreates the audio signal. This type of modulation can be described as driving +VDD, -VDD, and 0V across the speaker which is why it is referred to as 3-Level modulation. Classical, 2-Level modulation drives either +VDD or -VDD across the speaker at all times. This scheme requires an L-C filter between the amplifier's outputs and the speaker in order to keep the output current low. LOW-EMI OUTPUT STAGE WITH SLEW RATE LIMITING AND ACTIVE OVERSHOOT CLAMPING With 3-Level modulation, the carrier frequency drives a full amplitude common-mode signal to the speaker wires. This can cause high EMI radiation. One way to combat this would be to filter the outputs with LC filters or ferrite beads located close to the amplifier. In the LX1702, the output stage has been carefully designed to minimize EMI radiation so that these types of filters are not required. Slew rate limiting is used to keep the outputs from switching too quickly. Active overshoot clamping is used to minimize the inductive overshoot which occurs at each transition. These two techniques allow the LX1702 to easily meet FCC standards for radiated emissions when driving up to 3 meters of speaker wire. DIFFERENTIAL SIGNAL PATH, WIDE DYNAMIC RANGE, AND BUILT-IN THERMAL OVERLOAD PROTECTION The fully differential signal path uses Pulse Width Modulation and multiple feedback loops to provide high performance and low distortion. This is all fully-integrated to eliminate the need for any external feedback components or filters. The gain is fixed by internal resistors at 20dB. The differential signal path and internal voltage boosters allow for wide dynamic range. In fact, the LX1702 can be operated from supplies as low as 2.5V and as high as 5.5V. The output power will be limited by the available supply voltage. An internal thermal sensing circuit shuts down the outputs when the junction temperature exceeds about 150C to provide thermal overload protection. APPLICATIONS APPLICATIONS Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET THD+N VS. POWER 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 THD+N VS. FREQUENCY 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 PVDD=VDD=5.0V, RL = 8OHM Fin=1KHz, 10~22KHz BPF WWW .Microsemi .C OM PVDD=VDD=5V, RL=8OHM POUT=1W, 10 ~ 22KHz BPF % % 0.02 0.01 0.005 0.002 0.001 20 60m 100m 200m 500m W 1 2 5 50 100 200 500 Hz 1k 2k 5k 10k 20k THD VS. POWER VS. VIN 100 50 20 10 5 2 1 0.5 % 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 60m 100m 200m 500m W 1 2 5 SIGNAL TO NOISE +0 -5 -10 -15 -20 -25 -30 -35 -40 -45 dBr -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 20 50 100 Hz 200 500 1k VIN = 2.5V, 3.5V, 4.5V, 5.5V, RL = 8OHM PVDD=VDD=5.0V RL=8OHM NO Input, 1 ~22KHz BPF Non A-weighted CHANNEL CROSSTALK +0 -5 -10 -15 -20 -25 -30 -35 -40 -45 dB -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 20 50 100 200 500 Hz 1k 2k 5k 10k 20k CMRR +0 -5 -10 -15 -20 -25 -30 -35 -40 -45 dBr -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 20 PVDD=VDD=5.0V, RL = 8OHM POUT = 1W, 10 ~ 22KHz BPF GRAPHS GRAPHS 50 100 200 500 Hz 1k 2k 5k 10k 20k Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET FREQUENCY RESPONSE +6 +5.5 +5 +4.5 +4 +3.5 +3 +2.5 +2 +1.5 +1 +0.5 -0 dBr -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5 -5 -5.5 -6 PSRR +0 -5 -10 -15 -20 -25 -30 -35 -40 dBr -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 20 50 100 200 500 Hz 1k 2k 5k 10k 20k WWW .Microsemi .C OM PVDD=VDD=5.0V, RL = 8OHM Input Shorted, ?V = 1VP-P 20 50 100 200 500 1k Hz 2k 5k 10k 20k 50k 80k GAIN RESPONSE +30 +29 PVDD=VDD=5.0V, RL = 8OHM +28 +27 Pout=1W, 10 ~ 80KHz BPF +26 +25 +24 +23 +22 +21 +20 +19 +18 +17 +16 dBr +15 +14 +13 +12 +11 +10 +9 +8 +7 +6 +5 +4 +3 +2 +1 +0 20 50 100 200 500 1k 2k Hz 5k 10k 20k 50k 80k GRAPHS GRAPHS Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET PACKAGE DIMENSIONS WWW .Microsemi .C OM LQ 16-Pin MLPQ Plastic (4x4mm EP / 114x114Cu Exposed Pad) D b E2 L E D2 e A1 A3 A K Dim A A1 A3 b D E e D2 E2 K L Note: MILLIMETERS MIN MAX 0.80 1.00 0 0.05 0.18 0.30 0.23 0.38 4.00 BSC 4.00 BSC 0.65 BSC 2.55 2.80 2.55 2.80 0.20 0.30 0.50 INCHES MIN MAX 0.031 0.039 0 0.002 0.007 0.012 0.009 0.015 0.157 BSC 0.157 BSC 0.026 BSC 0.100 0.110 0.100 0.110 0.008 0.012 0.020 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. MECHANICALS MECHANICALS Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10 LX1702 TM (R) 1W Filter less Stereo Class-D Amplifier PRODUCTION DATA SHEET NOTES WWW .Microsemi .C OM NOTES NOTES PRODUCTION DATA - Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright (c) 2005 Rev. 1.0, 2006-10-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11 |
Price & Availability of LX1702CLQ
![]() |
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |