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LM4912 데이터시트 PDF




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부품번호 LM4912 기능
기능 Stereo 40mW Low Noise Headphone Amplifier
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LM4912 데이터시트, 핀배열, 회로
June 2003
LM4912
Stereo 40mW Low Noise Headphone Amplifier
General Description
The LM4912 is an stereo audio power amplifier capable of
delivering 40mW per channel of continuous average power
into a 16load or 25mW per channel into a 32load at 1%
THD form a 3V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4912 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4912 features a low-power consumption shutdown
mode and a power mute mode that allows for faster turn on
time with less than 1mV voltage change at outputs on re-
lease. Additionally, the LM4912 features an internal thermal
shutdown protection mechanism.
The LM4912 is unity gain stable and may be configured with
external gain-setting resistors.
Key Specifications
n PSRR at 217 Hz and 1kHz
65dB (typ)
n Output Power at 1kHz with VDD = 2.4V, 1% THD+N into
a 16load
25mW (typ)
n Output Power at 1kHz with VDD = 3V, 1% THD+N into a
16load
40mW (typ)
n Shutdown Current
1.0µA (max)
n Output Voltage change on release from Shutdown
VDD = 2.4V, RL = 16
1mV (max)
n Output Noise, 20Hz to 20kHz, A-weighted 10µV (typ)
Features
n External gain-setting capability
n Available in space-saving MSOP package
n Ultra low current shutdown mode
n Mute mode allows fast turn-on (10ms) with less than
1mV change on outputs
n 2.0V - 5.5V operation
n Ultra low noise
n Operation at low supply voltages
Applications
n Portable CD players
n PDAs
n Portable electronics devices
Typical Application
20048180
FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200481
www.national.com




LM4912 pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 2.4V (Notes 1, 2)
The following specifications apply for VDD = 2.4V, RL = 16, CO = 100µF, and CB = 4.7µF unless otherwise specified. Limits
apply to TA = 25˚C.
Symbol
Parameter
Conditions
LM4912
Units
Typ Limit (Limits)
(Note 6) (Note 7)
IDD Quiescent Power Supply Current VIN = 0V, IO = 0A
ISD Shutdown Current
VSHUTDOWN = GND
IM Mute Current
VMUTE = VDD
THD = 1%; f = 1kHz
1.5 3 mA (max)
0.1 2.0 µA (max)
1.5 3 mA (max)
PO Output Power
R = 1625 mW
R = 32
12
VNO
PSRR
TWU
VOSD
Output Noise Voltage
BW = 20 Hz to 20kHz, A-weighted
10
µV
Power Supply Rejection Ratio
Wake Up Time from Shutdown
VRIPPLE = 200mV sine p-p
65
2
dB
s
Output Voltage Change on
Release from Shutdown
1 mV (max)
TUM Time to Un-Mute
AM Mute Attenuation
f = 1kHz
0.01
80
0.02
s (max)
db
Note 1: All voltages are measured with respect to the GND pin unless otherwise specified.
Note 2: : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3: : The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The
maximum allowable power dissipation is PDMAX = (TJMAX - TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4912, see
power derating currents for more information.
Note 4: Human body model, 100pF discharged through a 1.5kresistor.
Note 5: Machine Model, 220pF-240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: 10Terminated input.
External Components Description See (Figure 1)
Components
1. RI
2. CI
3. Rf
4. CS
5. CB
6. Co
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a
high-pass filter with Ci at fc = 1/(2πRiCi).
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
high-pass filter with Ri at fc = 1/(2πRiCi). Refer to the section Proper Selection of External Components, for
an explanation of how to determine the value of Ci.
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of Proper
Components, for information concerning proper placement and selection of CB
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter with
RL at fo = 1/(2πRLCo)
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LM4912 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
Output Resistance vs Load Resistance
Output Power vs Supply Voltage
20048113
Output Power vs Supply Voltage
20048112
Output Power vs Load Resistance
20048111
Power Dissipation vs. Output Power
20048196
Power Dissipation vs. Output Power
20048198
7
20048199
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