LX1790
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
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
W W W.
Microsemi
.COM
The MSC-LX1790 also comes with
The MSC-LX1790 offers a patent
pending, low voltage, low power, and three output switch resistance settings to
high efficiency amplifier for driving a accommodate different receivers. It is
hearing aid receiver. It comes with three delivered in bare die form.
programmable gain settings of 14dB,
20dB and 26dB.
!
Low Operating Current: 100µA
Typical
!
Low Operating Voltage: 0.9V
minimum
!
3 Gain Settings: 14, 20 & 26dB
!
3 Output Switch Resistance
Settings: 48, 24 & 16
Ω
2
!
Small Form Factor: 2.03mm
Bare die
APPLICATIONS
!
Hearing Aid
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
C
LOCK
D
IN
P
RE
A
MP
Σ
CMP
H
BRIDGE
S
PEAKER
Simplified Block Diagram
LX1790
LX1790
PACKAGE ORDER INFO
T
J
(°C)
°
10 to 55
J
Cermic Dip
14 -Pin
LX1790CJ
LM
Plastic Dip
8-Pin
LX1790CLM
BD
Bare Die
7-Pin
LX1790CBD
Copyright
2001
Rev. 1.0,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 1
LX1790
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
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
Input Logic Supply Voltage (V
DD
) .............................................................. -0.3V to +3.0V
Operating Temperature Range........................................................................ 10°C to 55°C
PACKAGE PIN OUT
W W W.
Microsemi
.COM
IMP
SEL
(100,952)
V
SS
(1590,818)
OUT
N
(1590,609)
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.
(100,279)
(100,100)
(0,0)
OUT
P
IN
GAIN
SEL
V
DD
(1590,105)
(1590,349)
Pad Locations Are (X
MIN
, Y
MIN
) and are in µm
BD
(Bottom View)
V
SS
OUT
N
IMP
SEL
1
2
3
4
8
7
6
5
V
DD
OUT
P
GAIN
SEL
IN
LM P
ACKAGE
(Top View)
OUT
N
V
SS
1
2
3
4
5
14
13
12
11
10
9
8
OUT
P
V
DD
IMP
SEL
6
7
GAIN
SEL
IN
J P
ACKAGE
(Top View)
FUNCTIONAL PIN DESCRIPTION
P
IN
N
AME
V
DD
V
SS
IN
OUT
P
OUT
N
GAIN
SEL
IMP
SEL
P
IN
N
O
8 P
IN
LM
8
1
5
7
2
6
3
P
IN
N
O
14
PIN
J
13
2
8
14
1
9
6
Supply Voltage
Ground
Analog Audio Input
Positive Output Voltage
Negative Output Voltage
D
ESCRIPTION
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Gain Select. See Settings table below for selections.
Output Resistance Select. See Settings table below for selections.
SETTINGS
PIN
GAIN
SEL
IMP
SEL
Copyright
2001
Rev. 1.0,2002-05-08
GAIN
SEL
=VDD
IMP
SEL
=VSS
14dB
16Ω
GAIN
SEL
=VSS
IMP
SEL
=VDD
20dB
24Ω
GAIN
SEL
=Floating
IMP
SEL
=Floating
26dB
48Ω
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 2
LX1790
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
RODUCTION
D
ATA
S
HEET
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Test Conditions
Min
0.9
0
LX1790
Typ
Max
1.5
Units
W W W.
Microsemi
.COM
!
OPERATING CONDITIONS
Supply Voltage
Ground
V
DD
V
SS
V
V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature T
A
=25°C except where otherwise
noted. Test conditions: V
DD
=1.3V, V
SS
=0V, R
LOAD
=200Ω in Series with 60mH
Parameter
Switch Output Resistance @ Low
Drive
Switch Output Resistance @ Med
Drive
Switch Output Resistance @ High
Drive
Quiescent Current @ Low Drive
Quiescent Current @ Med Drive
Quiescent Current @ High Drive
3dB Bandwidth – mid Frequency
3dB Bandwidth – max Frequency
Output Switching Frequency
Gain Setting 1
Gain Setting 2
Gain Setting 3
Power Supply Rejection Ratio
Total Harmonic Distortion @ Gain =
14dB
Total Harmonic Distortion @ Gain =
20dB
Total Harmonic Distortion @ Gain =
26bd
Input Referred Noise
Input Referred Noise
Input Referred Noise
Input Resistance
Input Resistance
Input Resistance
Output clock frequency
DC Offset OutN-OutP
A
1
A
2
A
3
PSRR
THD
14
THD
20
THD
26
V
N-14
V
N-20
V
N-26
R
IN-14
R
IN-20
R
IN-26
Symbol
R
OUT-L
R
OUT-M
R
OUT-HI
IDDQ
L
IDDQ
M
IDDQ
H
F
MIN
F
MAX
F
CLK
Test Conditions
Min
LX1790
Typ
48
24
16
100
110
120
Max
Units
Ω
19
µA
All gain settings
20
40
100
Hz
KHz
200
12
18
24
14
20
26
45
0.3
0.3
0.3
20
10
6
120
83
53
140
200
0
300
5
16
22
28
KHz
dB
dB
dB
dB
%
%
%
µV
µV
µV
K
Ω
K
Ω
K
Ω
KHz
mV
V
IN
= 100mV
RMS
@ 1KHz
V
IN
= 50mV
RMS
@ 1KHz
V
IN
= 25mV
RMS
@ 1KHz
Input Reference
V
IN
= 50mV
RMS
@ 1KHz
V
IN
= 25mV
RMS
@ 1KHz
V
IN
=12mV
RMS
@ 1KHz
Gain = 14dB, 100Hz – 10Khz, A-Weighted
Gain = 20dB, 100Hz – 10Khz, A-weighted
Gain = 26dB, 100Hz – 10Khz, A-weighted
Gain = 14dB
Gain = 20dB
Gain = 26dB
E
LECTRICALS
E
LECTRICALS
F
CLK
V
OFF-NP
No input signal
-5
Copyright
2001
Rev. 1.0,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 3
LX1790
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
RODUCTION
D
ATA
S
HEET
CHARTS
W W W.
Microsemi
.COM
THD vs input level
4
3.5
3
THD [%]
2.5
2
1.5
1
0.5
0
0
20
40
60
80
100
Input [mVrms]
Figure 1
– THD vs. Input Level FIN = 1kHz, Gain = 20dB (Note: clip level at 90mVrms)
LX1790 H-bridge on impedance
30
25
20
15
10
5
Ron [Ohm]
C
HARTS
C
HARTS
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)
Copyright
2001
Rev. 1.0,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 4
LX1790
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
RODUCTION
D
ATA
S
HEET
MECHANICALS
W W W.
Microsemi
.COM
BD
7-Pin Bare Die
Dim
X
Y
Z
(1590,818)
1.78m m
(100,952)
M
ILLIMETERS
MIN
MAX
1.15
1.78
0.190 0.216
I
NCHES
MIN
MAX
0.045
0.070
0.0075 0.0085
1.15m m
(1590,609)
(1590,349)
(100,279)
(100,100)
(0,0)
(1590,105)
Pad Locations Are (X
M IN
, Y
M IN
) and are in µm
J
14-Pin Ceramic Dip
A
Dim
B
1
L
C
F
J
K
H
G
D
A
B
C
D
F
G
H
J
K
L
M
M
M
ILLIMETERS
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
3.17
5.08
7.37
7.87
-
15°
I
NCHES
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°
M
ECHANICALS
M
ECHANICALS
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. 1.0,2002-05-08
Microsemi
INTEGRATED PRODUCTS
5973 Avenida Encinas, Suite 101, Carlsbad 92008, Fax (760) 431-0541
Page 5
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