LX1702
TM
®
1W Filter less Stereo Class-D Amplifier
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
No Output Filter Required
Low EMI Design
Low Quiescent Current: 4mA
Low Shutdown Current: 1µA
Wide Supply Voltage Range:
2.5-5.5 Volt
1W Output Power into 8Ω 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 16-
pin MLPQ.
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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+
IN1-
IN2+
VSS
IN2-
PVDD2
Part
LX1702
OUT2+
PVSS2
EN
Speaker Out 2
Portable Speakers
Portable DVD
PMP / PMC
Notebook PC
IN2-
IN2+
ENABLE
PACKAGE ORDER INFO
T
A
(°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
©
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
®
1W Filter less Stereo Class-D Amplifier
P
RODUCTION
D
ATA
S
HEET
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 (T
A
) ................................................................0°C to +70°C
Maximum Operating Junction Temperature (T
J
) ....................................................... 150°C
Storage Temperature Range.........................................................................-65°C to 150°C
Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+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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OM
PVDD1
OUT1+
16
15
14
PVSS1
VDD
IN1+
IN1-
PVSS3
13
12
11
OUT1-
1
2
3
4
5
6
7
8
OUT2-
PVDD2
OUT2+
PVSS2
e
10
9
THERMAL DATA
LQ P
ACKAGE
(Top View)
LQ
Plastic MLPQ 16-Pin 4mm x 4mm
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
RoHS / Pb-free 100% Matte Tin Lead Finish
24.6°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
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
IN1-
IN1+
EN
IN2-
IN2+
VDD
PVSS1
PVSS2
PVSS3
OUT1+
PVDD1 &
PVDD2
OUT1-
OUT2+
OUT2-
Negative 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
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
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
©
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
®
1W Filter less Stereo Class-D Amplifier
P
RODUCTION
D
ATA
S
HEET
SYSTEM CHARACTERISTICS
The following specifications apply over the operating ambient temperature 0 < T
A
< 70°C except where otherwise noted and the following
test conditions: PVDD = VDD = 5.0V, PVSS = VSS = 0V, RL = 8Ω
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
G
SYS
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Microsemi
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OM
Symbol
I
QQ
I
QQSD
P
Q
Η
THD_N
SNR
V
N
F
LO
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, R
L
= 8Ω
VDD = PVDD = 5V, F = 1kHz, P
O
= 0.5W,
A-weighted
Input Grounded A-weighted 20 to 20kHz
3dB relative to 1kHz
VDD = PVDD = 2.5 to 5.5V, RL = 8Ω,
P
O
= 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
µA
W
%
%
dB
µV
RMS
20
20K
3
Hz
dB
dB
dB
dB
55
55
60
60
20
E
LECTRICALS
E
LECTRICALS
Copyright
©
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
®
1W Filter less Stereo Class-D Amplifier
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
The following specifications apply over the operating ambient temperature 0 < T
A
< 70°C except where otherwise noted and the following
test conditions: PVDD = VDD = 5.0V, PVSS = VSS = 0V, RL = 8Ω
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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Microsemi
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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
µA
dB
KΩ
mV
Static Drain-to-Source ON-
Resistance
Stage Gain
Thermal Junction Shutdown
Thermal Shutdown Hysteresis
Enable Threshold
Under Voltage Threshold Level
VDD PVDD
f
SW
VDD = PVDD = 2.5 ~ 5.5V
VDD = PVDD = 5V
No Load
I
QQ
VDD = PVDD = 3.3V
I
QQSD
Disable Pin Active
PSRR
VDD = PVDD = 2.5V to 5.5V
R
IN
VDD = PVDD = 2.5V ~ 5.5V Single Ended
V
OFF
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
G
H
VDD = PVDD = 2.5V to 5.5V
T
J
EN
V
DD
55
-50
mΩ
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
E
LECTRICALS
E
LECTRICALS
VDD
VSS
De-pop signal
ground
Generation
LP
PVSS2
LP
EN
Figure 1 –
LX1702 Simplified Block Diagram (Half Circuit)
Copyright
©
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
®
1W Filter less Stereo Class-D Amplifier
P
RODUCTION
D
ATA
S
HEET
SYSTEM TEST SETUP
WWW .
Microsemi
.C
OM
Power
Supply
-
+
VBAT
GND
C1
2nd Order
RC LPF
TP1-
OUT1-
Input1-
Audio
Precision
System One
GND
Input1+
Input2-
Output1-
Audio
Precision
System One
Output1+
Output2-
IN1-
OUT1+
IN1+
IN2-
LX1702
2nd Order
RC LPF
2nd Order
RC LPF
TP1+
TP2-
OUT2-
IN2+
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
A
PPLICATIONS
A
PPLICATIONS
Copyright
©
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
Embedded System
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