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LX1704
TM (R)
2W 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 2W Output Power into 4 Load with THD<1% @ 5.0V THD+N as Low as 0.1% Small Form Factor...16 pin MLP Package Only 4 x 4mm Built-in Clock Frequency Built-in Feedback Loop, Keep High Audio Fidelity Fixed 20dB Gain Full 20 - 20kHz Audio Bandwidth Shut-down Function Internal Thermal Shutdown High Efficiency: over 85% through Modulation Scheme and Class-D Operation Built-in De-Pop Circuit
APPLICATIONS
PVDD
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The LX1704 family represents a new generation of a fully integrated audio stereo Class-D amplifier from Microsemi. This CMOS stereo ClassD 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 LX1704 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 part features on board, low Rdson, complementary output MOSFET's that reduces the need for external components. The LX1704 is offered in a small footprint, low profile, 4mm x 4mm 16pin MLPQ.
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 LX1704
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
LX1704 LX1704
LX1704CLQ
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1704CLQ-TR)
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1704
TM (R)
2W 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
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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
LQ
Plastic MLPQ 16-Pin 4mm x 4mm 24.6C/W
LQ PACKAGE
(Top View)
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.
RoHS / Pb-free 100% matte Tin Lead Finish
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 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 Description
IN2+
VSS
IN2-
EN
THERMAL DATA
PACKAGE DATA PACKAGE DATA
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX1704
TM (R)
2W 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 = 4 Parameter
Supply Current: Quiescent Supply Current: Shutdown Mode Output Power @ 4 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
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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 = 4 VDD = PVDD = 5V, F = 1kHz, PO = 1W, Aweighted Input Grounded A-weighted 20 to 20kHz 3dB relative to 1kHz VDD = PVDD = 2.5 to 5.5V, RL = 4, PO = 200mW @ 20 to 80kHz, Filter less Input Reffered, VDD = PVDD = 2.5V to 5.5V VDD = PVDD = 2.5V to 5.5V
Min
LX1704 Typ
2.5 2.4 3.3 0.9 1.2 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. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1704
TM (R)
2W 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 = 4 Parameter
Supply Voltage Oscillator Frequency Supply Current: Quiescent Supply Current: Shutdown Mode Power Supply Rejection Ratio Input Resistance Output DC Offset
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Symbol
Test Conditions
Min
2.5
LX1704 Typ
200 2.5 2
Max
5.5 5 4 1
Units
V kHz mA A dB K mV
Static Drain-to-Source ONResistance
Stage Gain Thermal Indicator Junction Under Voltage Threshold Level Enable Threshold
VDD PVDD fSW VDD = PVDD = 2.5 to 5.5V VDD = PVDD = 5V IQQ No Load VDD = PVDD = 3.3V IQQSD Disable Pin Active PSRR VDD = PVDD = 2.5V to 5.5V RIN VDD = PVDD = 2.5V to 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 VDD EN
55 -50
60 18 +50 350 350 470 470 600 600 11 2.2 2.40
m
9 1.8 2.10
10 150 2.0 2.25
V/V C V V
ELECTRICALS ELECTRICALS
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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Triangle Wave Generator
LX1704
PVDD2 PVDD1
DRIVER
VINP VINN
Dynamic Pulse Generation
DRIVER
OUTP OUTN
PVSS1
De-pop signal ground Generation LP
VDD VSS
PVSS2
LP
EN
Figure 1 - LX1704 Simplified Block Diagram (Half Circuit)
BLOCK DIAGRAM BLOCK DIAGRAM
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
SYSTEM TEST SETUP
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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+ IN2LX1704 2nd Order RC LPF 2nd Order RC LPF TP1+ TP2OUT2IN2+ OUT2+ 2nd Order RC LPF TP2+
Output2+
Input2+
LX1704 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. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
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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
LX1704 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 LX1704 Application
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
FUNCTIONAL DESCRIPTION
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GENERAL DESCRIPTION The LX1704 is a filterless, low-EMI, class-D audio power amplifier. It offers high performance (THD+N is just 0.1% @ 2W), high efficiency (>85% @ 1.2W), 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 LX1704 may be operated with just a single decoupling capacitor. FILTERLESS 3-LEVEL CLASS-D MODULATION The LX1704 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 LC 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 LX1704, 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 LX1704 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 LX1704 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. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
THD+N VS. POWER
THD+N VS. FREQUENCY
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GAIN RESPONSE
NOISE FLOOR
CHANNEL CROSSTALK
3.5 3 2.5 IQQ (mA) 2 1.5 1 0.5 0
IQQ VS. SUPPLY VOLTAGE
GRAPHS GRAPHS
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
POWER SUPPLY VS OUTPUT POWER
900 800 700 600 Current (mA) 500 400 300 200 100 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Power (mW)
PSRR
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POWER VS SUPPLY VOLTAGE
3500 3000 2500 Power/CH (mW) 2000
1500 1000 500 0 2.5 3 3.5 4 4.5 5 5.5 Supply Voltage (V)
GRAPHS GRAPHS
Copyright (c) 2005 Rev. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
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LQ
16-Pin MLPQ Plastic (4mm x 4mm EP / 114x114Cu Exposed Pad)
D b E2 L D2
E
e A A3
K
or
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
A1
Pin 1 Indicator
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. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
LX1704
TM (R)
2W Filter less Stereo Class-D Amplifier
PRODUCTION DATA SHEET
NOTES
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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. 1.2, 2006-10-11
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12

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