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PDF LM48860 Data sheet ( Hoja de datos )
| Número de pieza | LM48860 | |
| Descripción | Fixed Gain Stereo Headphone Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet.in
October 17, 2008
LM48860
Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo
Headphone Amplifier
General Description
The LM48860 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 40mW per channel of contin-
uous average power into a 16Ω single-ended load with less
than 1% THD+N from a 3V power supply.
The LM48860 features a new circuit technology that utilizes
a charge pump to generate a negative reference voltage. This
allows the outputs to be biased about ground, thereby elimi-
nating output-coupling capacitors typically used with normal
single-ended loads.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM48860 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM48860 features a low-power consumption shutdown
mode selectable for either channel separately. This is accom-
plished by driving either the SD_RC (Shutdown Right Chan-
nel) or SD_LC (Shutdown Left Channel) (or both) pins with
logic low, depending on which channel is desired shutdown.
Additionally, the LM48860 features an internal thermal shut-
down protection mechanism.
The LM48860 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during turn-on
and turn-off transitions.
The LM48860 has an internal fixed gain of 1.5V/V.
Key Specifications
■ PSRR at 217Hz (VDD = 3.0V)
■ Stereo Power Output at VDD = 3V
RL = 16Ω, THD+N = 1%
■ Shutdown Current
■ Internal Fixed Gain
■ Operating Voltage
80dB (typ)
40mW (typ)
0.1μA (typ)
1.5V/V (typ)
2.0V to 5.5V
Features
■ Fixed logic levels with supply voltage
■ Ground referenced outputs
■ High PSRR
■ Available in space-saving micro SMD package
■ Ultra low current shutdown mode
■ Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
■ No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
■ Shutdown either channel independently
Applications
■ Mobile Phones
■ MP3 Players
■ PDAs
■ Portable electronic devices
■ Notebook PCs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300068
www.national.com
1 page  
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Symbol
Parameter
ZOUT
IL
Output Impedance
Input Leakage
Conditions
VSD = GND
Input Terminated
Input not terminated
SD_LC = SD_RC = GND
LM48860
Typical
(Note 6)
Limit
(Note 7)
30
30
±0.1
20
Units
(Limits)
kΩ (min)
kΩ
nA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
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 LM48860, see power
derating curves for additional information.
Note 4: Human body model, applicable std. JESD22-A114C.
Note 5: Machine model, applicable std. JESD22-A115-A.
Note 6: Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product
characterization and are not guaranteed.
Note 7: Datasheet min/max specification limits are guaranteed by test or statistical analysis.
Note 8: θJA value is measured with the device mounted on a PCB with a 1.5” x 1.375”, 1oz copper heatsink.
External Components Description
(Figure 1)
Components
1. C1
2. C2
3. C3
4. C4
5. C5
6. C6
Functional Description
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high pass-
pass filter with Ri at fC = 1/(2RiC1). Refer to the section Proper Selection of External Components, for an
explanation of how to determine the value of C1.
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high pass-
pass filter with Ri at fC = 1/(2RiC2). Refer to the Power Supply Bypassing section for an explanation of how to
determine the value of C2.
Output capacitor. Low ESR ceramic capacitor (≤100mΩ)
Flying capacitor. Low ESR ceramic capacitor (≤100mΩ)
Tantalum capacitor. 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.
Ceramic capacitor. 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.
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Supply Current vs Supply Voltage
VIN = GND, No Load
Power Derating Curve
VDD = 3V, RL = 16Ω
Power Derating Curve
VDD = 3V, RL = 32Ω
30006898
Power Derating Curve
VDD = 5V, RL = 16Ω
30006890
Power Derating Curve
VDD = 5V, RL = 32Ω
30006891
30006892
30006893
11
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM48860.PDF ] | |
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