LX1701
TM
®
2W Filterless Mono Class-D Audio Amplifier
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
No Output Filter Required
Low EMI Design
Low Quiescent Current: 2mA
Low Shutdown Current:1µA
Low And Wide Supply Voltage
Range: 1.8-6.0 Volt
2W Output Power Into 4Ω Load
With THD<1%
3W Into 2Ω With THD<1%
THD+N As Low As 0.09%
Small Form Factor: 16-pin MLPQ
Package: 4mmx4mm
-40 to +85°C Operating Range
Only
1
External Component
Needed, No Input AC Coupling
Capacitor Required, Under
Certain Conditions
Built-in Clock Frequency 200KHz
Built-in Feedback Loop, Allows
High Audio Fidelity
14dB/8dB Gain Selectable
20/300Hz Bandwidth Selectable
Shut-down Function
Internal Thermal Shut-down
High Efficiency: 85% Through
Modulation Scheme And Class-D
Operation
Built-in De-pop Circuit, No Turn
ON/OFF “POP” Noise
The LX1701 family represents a
new generation of a fully integrated
audio mono class-D amplifier from
Microsemi. This CMOS monolithic
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 cell phones, PDA’s, web tablets
and other low power systems.
The LX1701 family provides very
low quiescent current consumption
through the use of a proprietary output
modulation scheme. This technology
enables filter-less operation in many
applications. The part features on board,
low Rdson, complementary output
MOSFET’s that reduces the need for
external components.
The LX1701 is offered in a small
footprint, low profile surface mountable
16-pin MLPQ package.
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
PVDD
VDD
PVDD
GAIN
Clock
Gain
Decoder
INP
Audio
Input
OUTP
APPLICATIONS/BENEFITS
+
INN
PWM
H-Bridge
& Driver
_
VDD
OUTN
LPF
LPF
De-POP
PDA's
Cell Phones
Portable Audio
Laptop Computer Speaker
Amplifier
LCD TV/Desktop Monitor
Speaker Amplifier
PC Audio Multimedia Amplifier
LX1701
VSS
PVSS
LX1701
LX1701
PACKAGE ORDER INFO
T
J
(°C)
-40 to 85
Bare Die
LX1701
LQ
16-Pin
Plastic MLPQ
LX1701CLQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX1701CLQTR)
Copyright
©
2004
Rev. 1.0a, 2004-07-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570
Page 1
LX1701
TM
®
2W Filterless Mono Class-D Audio Amplifier
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
TOVL
GAIN
VINN
VINP
WWW .
Microsemi
.C
OM
Positive Supply Voltage (VDD, PVDD)............................................. -0.3 to 7.0V
Operating Temperature ..................................................................-40°C to +85°C
Maximum Operating Junction Temperature ................................................ 150°C
Storage Temperature......................................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ................................................ 300°C
Package Peak Temp for Solder Reflow(40 second maximum exposure)...... 250°C (+5, -0)
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
.
12
11
10
9
8
7
6
5
VDD
3LEL
VSS
PVSS
13
14
15
16
1
2
3
4
BW_SEL
EN
VSS
PVSS
OUTN
PVDD
PVDD
OUTP
THERMAL DATA
LQ P
ACKAGE
(Top View)
LQ
Plastic Micro Lead Quad Package 16-Pin
3.22°C/W
38.1°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
Pb-free 100% Matte Tin Finish
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. Thermal Test Board: JESD5-7 (Leaded Surface Mount Package)
FUNCTIONAL PIN DESCRIPTION
Name
OUTN
PVDD
PVDD
OUTP
PVSS
VSS
EN
BW_SEL
Negative Audio (PWM) Output
Positive Supply to Negative Output Stage
Positive Supply to Positive Output Stage
Positive Audio (PWM) Output
Negative Supply to Positive Output Stage (ground)
Negative Supply to Analog Stage (ground)
Enable Pin, Active High.
Bandwidth Selection Pin:
VDD 300Hz HP filter
VSS No HP (< 20Hz)
Gain Selection Pin:
Tied to VDD Gain = 14dB
Tied to VSS Gain = 8dB
Negative Audio Input
Positive Audio Input
Thermal Overload Indicator Output, Active HIGH.
Analog Positive Power Supply
Three Level Modulation Selection Pin:
Tied to VSS 2 LEVEL PWM Modulation Scheme, +PVDD | -PVDD;
Tied to VDD 3 LEVEL PWM Modulation Scheme, +PVDD | PVSS | -PVDD;
Negative Power Supply to Analog Stage
Negative Supply to Negative Output Stage (ground)
Description
GAIN
VINN
VINP
TOVL
VDD
3LVL
VSS
PVSS
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
©
2004
Rev. 1.0a, 2004-07-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570
Page 2
LX1701
TM
®
2W Filterless Mono Class-D Audio Amplifier
P
RODUCTION
D
ATA
S
HEET
SYSTEM CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature T
A
= 25°C except where otherwise
noted and the following test conditions: Default settings: 20Hz corner low frequency, 14dB gain.
Parameter
Symbol
Test Conditions
No Load, VDD = PVDD = 1.8V
Supply Current, Quiescent
IQQ
No Load, VDD = PVDD = 3.3V
No Load, VDD = PVDD = 5.0V
Supply Current, Shutdown Mode
IQQSD
Disable pin active
VDD = PVDD = 5V,
Fin = 1kHz
Output Power @ 8 Ohms
PO
VDD = PVDD = 3.3V,
Fin = 1kHz
VDD = PVDD = 5V,
Fin = 1kHz
Output Power @ 4 Ohms
PO
VDD = PVDD = 3.3V,
Fin = 1kHz
VDD = PVDD = 5V,
Fin = 1kHz
Output Power @ 2 Ohms
PO
VDD = PVDD = 3.3V,
Fin = 1kHz
Power Efficiency
Total Harmonic Distortion @ 50% of
Max Power
Signal-to-Noise Ratio
η
THD+N
SNR
THD+N = 1%
THD+N = 10%
THD+N = 1%
THD+N = 10%
THD+N = 1%
THD+N = 10%
THD+N = 1%
THD+N = 10%
THD+N = 1%
THD+N = 10%
THD+N = 1%
THD+N = 10%
1.3
1.8
0.5
0.7
2.1
2.8
0.9
1.2
3.0
3.9
1.3
1.8
85
0.09
99
%
%
dB
W
W
W
WWW .
Microsemi
.C
OM
Min
LX1701
Typ
0.9
1.3
2.0
Max
1.2
1.8
2.5
1
Units
mA
µA
VDD = PVDD = 5V, Fin = 1kHz, RL = 8
Ω
VDD = PVDD = 5V, Fin = 1kHz, RL = 8
Ω
VDD = PVDD = 5V, F = 1KHz, PO = 1W,
A-Weighted
Output Noise Floor
Frequency Response Lower Corner
Frequency
Frequency Response
Power Supply Rejection Ratio
Common Mode Rejection Ratio
Gain
VN
FLO
FHI
Input Grounded A-weighted 20-20kHz
3dB relative to 1kHz, BW Select = VSS
3dB relative to 1kHz, BW Select = VDD
VDD = PVDD = 1.8 to 5.5V, RL = 4
Ω
,
PO = 200mW @ 20~80KHz, filterless
25
20
300
3
65
70
14
8
µV
RMS
Hz
Hz
dB
dB
dB
dB
PSRR
CMRR
GSYS
VDD = PVDD = 1.8V to 5.5V
VDD = PVDD = 1.8V to 5.5V
Pin 9 tied to VDD, VDD = PVDD = 1.8V to 5.5V
Pin 9 tied to VSS, VDD = PVDD = 1.8V to 5.5V
E
LECTRICALS
E
LECTRICALS
Copyright
©
2004
Rev. 1.0a, 2004-07-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570
Page 3
LX1701
TM
®
2W Filterless Mono Class-D Audio Amplifier
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C
≤
T
A
otherwise noted.
Parameter
Supply Voltage
Oscillator Frequency
≤
85°C except where
WWW .
Microsemi
.C
OM
Symbol
VDD
PVDD
fSW
Test Conditions
Min
1.8
LX1701
Typ
Max
6.0
Units
V
KHz
VDD = PVDD = 1.8~5.5V
VDD = PVDD = 5V
180
200
2.0
1.3
0.9
225
2.5
1.8
1.2
1
Supply Current, Quiescent
IQQ
No Load
VDD = PVDD = 3.3V
VDD = PVDD = 1.8V
mA
Supply Current, Shutdown Mode
Power Supply Rejection Ratio
Common Mode Rejection Ratio
Input Impedance
Input voltage Range
IQQSD
PSRR
CMRR
Disable Pin active
VDD = PVDD = 1.8V to 5.5V
VDD = PVDD = 1.8V to 5.5V
65
70
µA
dB
dB
VIN
K
IN
VDD = PVDD = 1.8~5.5V
Gain = 14dB, BW = 20Hz
Gain = 14dB, BW = 300Hz
Gain = 8dB, BW = 20Hz
Gain = 8dB, DB = 300Hz
Input shorted to GND, 20Hz corner, 14dB gain
VDD = PVDD = 3.3V
Gain = 14dB BW = 20Hz, PVDD = 5V
Gain = 14dB, BW = 300Hz, PVDD = 5V
Gain = 8dB, BW = 20Hz, PVDD = 5V
Gain = 8dB, BW = 300Hz, PVDD = 5V
VDD = PVDD=5V
P Channel
N Channel
P Channel
N Channel
P Channel
N Channel
-0.3
65
72
98
102
2
0.14
1.50
0.25
2.70
360
350
490
460
600
600
14
8
150
†
†
VDD
+0.3
V
Input Resistance Differential
K
Ω
Output DC Offset
VOFF
V
INOFF
8
mV
Input DC Offset Dynamic Range
Max. with Output VOFF < 200mV
V
Static Drain-to-source ON-
Resistance
RDSON
VDD = PVDD=3.3V
m
Ω
VDD = PVDD=1.8V
GH
GL
T
J
VTOVL
VUV
VDD = PVDD =3.3V
VDD = PVDD = 1.8~5.5V
Stage Gain
Thermal Indicator Junction
Thermal Indicator Output
Under Voltage Threshold Level
Enable Threshold
Pin 9 tied to VDD, VDD = PVDD = 1.8V to 5.5V
Pin 9 tied to VSS, VDD = PVDD = 1.8V to 5.5V
dB
°C
VDD
+0.3
1.75
1.7
V
V
V
E
LECTRICALS
E
LECTRICALS
VDD
1.55
1.3
1.65
1.5
† At +85°C ambient temperature.
Copyright
©
2004
Rev. 1.0a, 2004-07-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570
Page 4
LX1701
TM
®
2W Filterless Mono Class-D Audio Amplifier
P
RODUCTION
D
ATA
S
HEET
SIMPLIFIED BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
Triangle Wave
Generator
EN
GAIN
Gain
Decoder
Driver
OUTP
VINP
VINN
Dynamic pulse
generator
Driver
LPF
LPF
OUTN
VDD
VSS
De-pop ground
signal ground
generation
PVSS
PVSS
PVDD
PVDD
Figure 1
– LX1701 Simplified Block Diagram
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
Copyright
©
2004
Rev. 1.0a, 2004-07-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570
Page 5
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