Microsemi LX1792BD Low voltage, low power, audiomite class-d audio amplifier Datasheet

LX1792
I N T E G R A T E D
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P R O D U C T S
P RELIMINARY S PECIFICATION
KEY FEATURES
DESCRIPTION
The LX1790 consists of a preamplifier
followed by a fixed gain class D amplifier.
The input resistor and feedback
resistor is external in the LX1792 making
it possible to set the gain arbitrarily, up to
approximately 40dB.
The feedback
resistor can also be potentiometer to
facilitate volume control.
! 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
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The MSC-LX1792 offers a patent
pending, low voltage, low power, and
high efficiency amplifier for driving a
high impedance speaker such as a hearing
aid receiver.
The core of the amplifier is built upon
Microsemi’s patented LX1790 class D
amplifier.
PRODUCT HIGHLIGHT
CLOCK
DIN
PRE AMP
Σ
CMP
HBRIDGE
SPEAKER
TJ (°°C)
10 to 55
Copyright  2001
Rev. 0.3,2002-05-08
J
LM
Plastic MLPM
8-Pin
LX1792CLM
Plastic MSOP
8-Pin
LX1792CDU
DU
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
BD
LX1792
PACKAGE ORDER INFO
Ceramic Dip
14-Pin
LX1792CJ
Bare Die
LX1792BD
Page 1
LX1792
I N T E G R A T E D
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P R O D U C T S
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
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ABSOLUTE MAXIMUM RATINGS
LM PACKAGE
(Top View)
SETTINGS
PIN
IMPSEL=VSS
IMPSEL=VDD
IMPSEL=Floating
IMPSEL
16Ω
24Ω
48Ω
VSS
1
8
VDD
OUTN
2
7
OUTP
IMPSEL
3
6
PREOUT
4
5
IN
DU PACKAGE
(Top View)
OUTN
1
14
OUTP
VSS
2
1
13
VDD
3
12
4
11
5
10
6
9
PREOUT
7
8
IN
IMPSEL
J PACKAGE
(Top View)
FUNCTIONAL PIN DESCRIPTION
PIN
NAME
PIN NO
14 PIN J
PIN NO
8 PIN DU
DESCRIPTION
VDD
13
8
8
Supply Voltage
VSS
2
1
1
Ground
IN
8
5
5
Analog Audio Input
OUTP
14
7
7
Positive Output Voltage
OUTN
1
2
2
Negative Output Voltage
PREOUT
9
6
6
Pre amplifier output
IMPSEL
6
3
3
Output Resistance Select. See Settings table below for selections.
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
PACKAGE DATA
(EVALUATION
SAMPLES)
PIN NO
8 PIN LM
Page 2
LX1792
I N T E G R A T E D
P R O D U C T S
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,Output loaded with 200Ohm in series
with 60mH.
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
Quiescent Current @ High Drive
IDDQH
3dB Bandwidth – min Frequency
FMIN
3dB Bandwidth – max Frequency
FMAX
Output Switching Frequency
Gain1
A1
Power Supply Rejection Ratio
PSRR
Total Harmonic Distortion
THD1
Input Referred Noise
VN-20
Output clock frequency
FCLK
Max absolute DC Offset OutN-OutP
VOFF-NP
No load
Max
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RECOMMENDED OPERATING CONDITIONS
Units
Ω
19
µA
120
130
40
R1=50k, R2=1000k, Fin=1kHz
100
10
Hz
KHz
FCLK
200
KHz
R1=50k, R2=500k
R1=25k, R2=500k
Input Reference
R1=50k, R2=500k
R1=50k, R2=500k, Vin=5mVrms, Fin=1kHz
R1=25k, R2=500k, Vin=5mVrms, Fin=1kHz
R1=50k, R2=500k, 100Hz-10kHz, No weighting
R1=25k, R2=500k, 100Hz-10kHz, No weighting
32
37
dB
45
dB
No input signal
0.3
0.5
4
3
%
µVrms
140
200
300
KHz
0
0.5
5
mV
()
ELECTRICALS
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 3
LX1792
I N T E G R A T E D
P R O D U C T S
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P RELIMINARY S PECIFICATION
CHARTS
W W W. Microsemi .COM
Note: Graphs show distortion with no load outputs
CHARTS
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 4
LX1792
I N T E G R A T E D
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P R O D U C T S
P RELIMINARY S PECIFICATION
W W W. Microsemi .COM
CHARTS (CONTINUED)
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. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 5
LX1792
I N T E G R A T E D
P R O D U C T S
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
R1
R2
RX/CX
Description
Input AC coupling capacitor, must be present
For best performance this should be as close as possible to the supply pins
> 25k Ohm
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.
APPLICATION
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 6
LX1792
I N T E G R A T E D
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P R O D U C T S
P RELIMINARY S PECIFICATION
LM
8-Pin Plastic MLP-Micro Exposed Pad
Dim
A
A
B
C
D
E
F
G
H
I
J
K
K
J
E
B
H
I
G
C
F
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
14-Pin Ceramic Dip
A
Dim
1
L
C
F
K
G
D
J
MILLIMETERS
MIN
MAX
19.30
19.94
5.59
7.11
5.08
0.38
0.51
1.02
1.77
2.54 BSC
2.03
0.20
0.38
3.18
5.08
7.37
7.87
15°
INCHES
MIN
MAX
0.760
0.785
0.220
0.280
0.200
0.015
0.020
0.040
0.070
0.100 BSC
0.080
0.008
0.015
0.125
0.200
0.290
0.310
15°
MECHANICAL
A
B
C
D
F
G
H
J
K
L
M
B
H
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
Internally Connected
together, but
isolated from all
other terminals
D
J
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MECHANICAL – 8 PIN MLPQ PACKAGE OUTLINE
M
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. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 7
LX1792
I N T E G R A T E D
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P R O D U C T S
P RELIMINARY S PECIFICATION
MECHANICALS
8-Pin MSOP
MILLIMETERS
MIN
MAX
2.85
3.05
2.90
3.10
–
1.10
0.25
0.40
0.65 BSC
0.38
0.64
0.13
0.18
0.95 BSC
0.40
0.70
3°
0.05
0.15
4.75
5.05
Dim
A
B
H
G
P
M
C
N
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DU
7-PIN BARE DIE
D
L
A
B
C
D
G
H
J
K
L
M
N
P
INCHES
MIN
MAX
.112
.120
.114
.122
–
0.043
0.009
0.160
0.025 BSC
0.015
0.025
0.005
0.007
0.037 BSC
0.016
0.027
3°
0.002
0.006
0.187
0.198
K
Dim
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.
MECHANICAL
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 8
LX1792
I N T E G R A T E D
P R O D U C T S
Low Voltage, Low Power, AudioMite™
Class-D Audio Amplifier
P RELIMINARY S PECIFICATION
NOTES
W W W. Microsemi .COM
NOTES
Preliminary Data – Information contained in this document is pre-production data and is
proprietary to Microsemi. It may not be modified in any way without the express written
consent of Microsemi. Product referred to herein is offered in sample form only and
Microsemi reserves the right to change or discontinue this proposed product at any time.
Copyright  2001
Rev. 0.3,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 9
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