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Copyright 2001
Rev. 1.0,2002-05-08
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LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
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INTEGRATED PRODUCTS
DESCRIPTION
DESCRIPTIONDESCRIPTION
DESCRIPTION
The MSC-LX1790 offers a patent
pending, low voltage, low power, and
high efficiency amplifier for driving a
hearing aid receiver. It comes with three
programmable gain settings of 14dB,
20dB and 26dB.
The MSC-LX1790 also comes with
three output switch resistance settings to
accommodate different receivers. It is
delivered in bare die form.
IMPORTANT: For the most current data, c ons ult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
KEY FEATURES KEY FEATURES
KEY FEATURES
! 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
! Small Form Factor: 2.03mm2
Bare die
APPLICATIONS
APPLICATIONS APPLICATIONS
APPLICATIONS
! Hearing Aid
PRODUCT HIGHLIGHT
PRODUCT HIGHLIGHTPRODUCT HIGHLIGHT
PRODUCT HIGHLIGHT
SPEAKER
DIN
CLOCK
PRE A MP CMP HBRIDGE
Σ
ΣΣ
Σ
Simplified Block Diagram
PACKAGE ORDER INFO
PACKAGE ORDER INFOPACKAGE ORDER INFO
PACKAGE ORDER INFO
TJ (°
°°
°C) J Cermic Dip
14 -Pin LM Plastic Dip
8-Pin BD Bare Die
7-Pin
10 to 55 LX1790CJ LX1790CLM LX1790CBD
L
LX
X1
17
79
90
0
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Copyright 2001
Rev. 1.0,2002-05-08
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LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
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ABSOLUTE MAXIMUM RAT
ABSOLUTE MAXIMUM RATABSOLUTE MAXIMUM RAT
ABSOLUTE MAXIMUM RATINGS
INGSINGS
INGS
Input Logic Su pply Voltage (VDD) ..............................................................-0.3 V to +3.0V
Operating Temperature Range........................................................................10°C to 55°C
Note: Exceeding thes e rati ngs could cause damage to the device. All voltages are with respect to
Ground. Cu rrents ar e positi ve into, negative out of s pecified terminal.
PACKAGE PIN OUT
PACKAGE PIN OUT PACKAGE PIN OUT
PACKAGE PIN OUT
Pad Locations Are (XMIN, YMIN) and are in µm
(100,952)
(100,279)
(100,100) (1590,105)
(1590,349)
(1590,609)
(1590,818)
IMPSEL
IN
GAINSEL
(0,0)
VDD
OUTP
OUTN
VSS
BD
(Bottom View)
1
2
3
45
6
7
8
VSS
OUTN
IMPSEL
IN
GAINSEL
OUTP
VDD
LM PACKAGE
(Top View)
1
2
3
4
5
6
78
9
10
11
12
13
14
OUTN
VSS
IMPSEL
IN
GAINSEL
VDD
OUTP
J PACKAGE
(Top View)
FUNCTIONAL PIN DESCR
FUNCTIONAL PIN DESCRFUNCTIONAL PIN DESCR
FUNCTIONAL PIN DESCRIPTION
IPTIONIPTION
IPTION
PIN NAME PIN NO
8 PIN LM PIN NO
14 PIN J DESCRIPTION
VDD 8 13 Supply Voltage
VSS 1 2 Ground
IN 5 8 Analog Audio Input
OUTP 7 14 Positive Output Voltage
OUTN 2 1 Negative Output Voltage
GAINSEL 6 9 Gain Select. See Settings table below for selections.
IMPSEL 3 6 Output Resistance Select. See Settings table below for selections.
SETTINGS
SETTINGSSETTINGS
SETTINGS
PIN GAINSEL=VDD
IMPSEL=VSS GAINSEL=VSS
IMPSEL=VDD GAINSEL=Floating
IMPSEL=Floating
GAINSEL 14dB 20dB 26dB
IMPSEL 16Ω 24Ω 48Ω
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
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Copyright 2001
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LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
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RECOMMENDED OPERATIN
RECOMMENDED OPERATINRECOMMENDED OPERATIN
RECOMMENDED OPERATING CONDITIONS
G CONDITIONSG CONDITIONS
G CONDITIONS
LX1790
Parameter Symbol Test Conditions Min Typ Max
Units
! OPERATING CONDITIONS
Supply Voltage VDD 0.9 1.5 V
Ground VSS 0 V
ELECTRICAL CHARACTER
ELECTRICAL CHARACTERELECTRICAL CHARACTER
ELECTRICAL CHARACTERISTICS
ISTICSISTICS
ISTICS
Unless ot herwise specified, the following specifications apply over the operating ambient temperature TA=25°C except where otherwise
noted. Test conditions: VDD=1.3V, VSS=0V, RLOAD=200Ω in Series with 60mH
LX1790
Parameter Symbol Test Conditions Min Typ Max
Units
Switch Output Resistance @ Low
Drive ROUT-L 48
Switch Output Resistance @ Med
Drive ROUT-M 24
Switch Output Resistance @ High
Drive ROUT-HI
16 19
Ω
Quiesc ent Current @ Low Drive IDDQL 100
Quiesc ent Current @ Med Drive IDDQM 110
Quiesc ent Current @ High Drive IDDQH
120
µA
3dB Bandwidth – mid Frequency FMIN 40 100 Hz
3dB Bandwidth – max Frequency FMAX All gain settings 20 KHz
Output Switching Frequency FCLK 200 KHz
Gain Setting 1 A1 V
IN = 100mVRMS @ 1KHz 12 14 16 dB
Gain Setting 2 A2 V
IN = 50mVRMS @ 1KHz 18 20 22 dB
Gain Setting 3 A3 V
IN = 25mVRMS @ 1KHz 24 26 28 dB
Power Supply Rejection Ratio PSRR Input Refe rence 45 dB
Total Harmonic Distort ion @ Gain =
14dB THD14 V
IN = 50mVRMS @ 1KHz 0.3 %
Total Harmonic Distort ion @ Gain =
20dB THD20 V
IN = 25mVRMS @ 1KHz 0.3 %
Total Harmonic Distort ion @ Gain =
26bd THD26 V
IN=12mVRMS @ 1KHz 0.3 %
Input Referred Nois e VN-14 Gain = 14dB, 100Hz – 10Khz, A-Weighted 20 µV
Input Referred Nois e VN-20 Gain = 20dB, 100Hz – 10Khz, A-weighted 10 µV
Input Referred Nois e VN-26 Gain = 26dB, 100Hz – 10Khz, A-weighted 6 µV
Input Resist ance RIN-14 Gain = 14dB 120 K Ω
Input Resist ance RIN-20 Gain = 20dB 83 K Ω
Input Resist ance RIN-26 Gain = 26dB 53 K Ω
Output clock frequency FCLK 140 200 300 KHz
DC Offset OutN-OutP VOFF-NP No input s i gnal -5 0 5 mV
E
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Copyright 2001
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LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
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CHARTS
CHARTSCHARTS
CHARTS
THD vs input level
0
0.5
1
1.5
2
2.5
3
3.5
4
0 20406080100
Input [mVrms]
THD [%]
Figure 1 – THD vs. Input Level FIN = 1kHz, Gain = 20dB (Note: clip level at 90mVrms)
LX1790 H-bridge on impedance
0
5
10
15
20
25
30
0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6
Supply voltage
Ron [Ohm]
Figure 2 – H-Bridge Impedance vs. Supply Voltage (Lowest Impedance Setting)
C
CH
HA
AR
RT
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Copyright 2001
Rev. 1.0,2002-05-08
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LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
p
lifie
r
INTEGRATED PRODUCTS
MECHANICALS
MECHANICALSMECHANICALS
MECHANICALS
BD 7-Pin Bare Die
(100,952)
(100,279)
(100,100) (1590,105)
(1590,349)
(1590,609)
(1590,818)
Pad Locations Are (XMIN, YMIN) and are in µm
(0,0)
1.15mm
1.78mm
MILLIMETERS INCHES
Dim MIN MAX MIN MAX
X 1.15 0.045
Y 1.78 0.070
Z 0.190 0.216 0.0075 0.0085
J 14-Pin Ceramic Dip
C
H
1
B
A
GD
F
K
L
J
M
MILLIMETERS INCHES
Dim MIN MAX MIN MAX
A 19.30 19.94 0.760 0.785
B 5.59 7.11 0.220 0.280
C - 5.08 - 0.200
D 0.38 0.51 0.015 0.020
F 1.02 1.77 0.040 0.070
G 2.54 BSC 0.100 BSC
H - 2.03 - 0.080
J 0.20 0.38 0.008 0.015
K 3.17 5.08 0.125 0.200
L 7.37 7.87 0.290 0.310
M - 15° - 15°
Note:
1. Dim ensions do not inc lude mold flash or protrus ions;
these shall not exceed 0.155mm(.006”) on any side.
Lead dimension shall not include solder c overage.
M
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AN
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6
Copyright 2001
Rev. 1.0,2002-05-08
WWW.Microsemi .COM
LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
p
lifie
r
INTEGRATED PRODUCTS
MECHANICALS
MECHANICALSMECHANICALS
MECHANICALS
LM 8-Pin Plastic MLP-Micro Exposed Pad
G
A
B
F
D
CInternally Connected
to ge t h er , but
is olat ed f rom all
other terminals
K
J
I
E
H
MILLIMETERS INCHES
Dim MIN MAX MIN MAX
A 2.90 3.10 0.114 0.122
B 2.90 3.10 0.114 0.122
C 0.65 0.75 0.025 0.029
D 0.15 0.25 0.005 0.009
E 1.841 BSC 0.075 BSC
F 0.27 0.43 0.010 0.016
G 0.65 BSC 0.025 BSC
H 1.22 BSC 0.048 BSC
I 0 0.10 0 0.003
J 0.21 0.37 0.008 0.014
K 0 0.10 0 0.003
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.
M
ME
EC
CH
HA
AN
NI
IC
CA
AL
LS
S
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ATA
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HEET
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Page
7
Copyright 2001
Rev. 1.0,2002-05-08
WWW.Microsemi .COM
LX1790
Low Voltage, Low Power, AudioMite™
Class-D Audio Am
p
lifie
r
INTEGRATED PRODUCTS
NOTES
NOTESNOTES
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 o f 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.
N
NO
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S
