LM48860
Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo
Headphone Amplifier
General Description
Key Specifications
The LM48860 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 40mW per channel of continuous 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 eliminating 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 applications where minimal power consumption is a primary requirement.
The LM48860 features a low-power consumption shutdown
mode selectable for either channel separately. This is accomplished by driving either the SD_RC (Shutdown Right Channel) 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 shutdown 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.
■ PSRR at 217Hz (VDD = 3.0V)
80dB (typ)
■ Stereo Power Output at VDD = 3V
RL = 16Ω, THD+N = 1%
40mW (typ)
■ Shutdown Current
0.1μA (typ)
■ Internal Fixed Gain
1.5V/V (typ)
■ Operating Voltage
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
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LM48860 Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier
October 17, 2008
LM48860
Typical Application
30006889
FIGURE 1. Typical Audio Amplifier Application Circuit
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LM48860
Connection Diagram
LM48860TL Pinout
(BUMP DOWN VIEW )
30006813
Top View
Order Number LM48860TL
See NS Package Number TLA12XXX
Pin Descriptions
Pin
Name
A1
RIN
A2
SGND
Function
Right Channel Input
Signal Ground
A3
LIN
B1
ROUT
Left Channel Input
Right Channel Output
B2
SD_LC
Active Low Shutdown, Left Channel
B3
LOUT
Left Channel Output
C1
VSS(CP)
Charge Pump Voltage Output
C2
SD_RC
Active-Low Shutdown, Right Channel
C3
VDD
D1
CCP-
Supply Voltage
Negative Terminal - Charge Pump Flying Capacitor
D2
PGND
Power Ground
D3
CCP+
Positive Terminal - Charge Pump Flying Capacitor
3
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LM48860
Absolute Maximum Ratings (Notes 2, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Rating(Note 4)
ESD Rating (Note 5)
150°C
θJA (typ) TLA12XXX
59.3°C/W
Operating Ratings
6.0V
−65°C to +150°C
-0.3V to VDD
Internally Limited
2000V
200V
Electrical Characteristics VDD = 3V
Junction Temperature
Thermal Resistance
Temperature Range
TMIN ≤ TA ≤ TMAX
−40°C ≤ TA ≤ 85°C
2.0V ≤ VDD ≤ 5.5V
Supply Voltage (VDD)
(Notes 1, 2)
The following specifications apply for VDD = 3V and 16Ω load unless otherwise specified. Limits apply to TA = 25°C.
LM48860
Symbol
IDD
Parameter
Conditions
VDD = 3.0V,
VIN = 0V, inputs terminated
Quiescent Power Supply Current both channels enabled
Full Power Mode
VDD = 5.0V,
VIN = 0V, inputs terminated
both channels enabled
Typical
(Note 6)
Limit
(Note 7)
4
5.5
4.2
Units
(Limits)
mA (max)
mA
SD_LC = SD_RC= GND
0.1
1
µA (max)
ISD
Shutdown Current
SD_LC = SD_RC= GND,
VDD = 5.0V
0.1
1
µA (max)
VOS
Output Offset Voltage
RL = 32Ω, VIN = 0V
0.7
5.5
mV (max)
AV
Voltage Gain
–1.5
V/V
ΔAV
Channel-to-channel Gain
Matching
1
%
RIN
Input Resistance
20
15
25
kΩ (min)
kΩ (max)
THD+N = 1% (max); f = 1kHz,
RL = 16Ω, (two channels in phase)
40
35
mW (min)
THD+N = 1% (max); f = 1kHz,
RL = 32Ω, (two channels in phase)
50
40
mW (min)
PO
THD+N
Output Power
Total Harmonic Distortion +
Noise
PO = 20mW, f = 1kHz, RL = 16Ω
(two channels in phase)
0.025
%
PO = 25mW, f = 1kHz, RL = 32Ω
(two channels in phase)
0.014
%
VRIPPLE = 200mVPP, Input Referred
PSRR
Power Supply Rejection Ratio
Full Power Mode
f = 217Hz
80
73
dB (min)
f = 1kHz
75
dB
f = 20kHz
60
dB
105
dB
SNR
Signal-to-Noise Ratio
RL = 32Ω, POUT = 50mW,
f = 1kHz, BW = 20Hz to 22kHz,
A-weighted
VIH
Shutdown Input Voltage High
VDD = 2.0V to 5.5V
1.2
V (min)
VIL
Shutdown Input Voltage Low
VDD = 2.0V to 5.5V
0.45
V (max)
XTALK
Crosstalk
RL = 16Ω, PO = 1.6mW,
f = 1kHz
75
dB
∈OS
Output Noise
A-weighted filter, VIN = 0V
8
μV
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Parameter
ZOUT
Output Impedance
IL
Input Leakage
Conditions
VSD = GND
Input Terminated
Input not terminated
SD_LC = SD_RC = GND
Typical
(Note 6)
30
30
Units
(Limits)
Limit
(Note 7)
20
kΩ (min)
kΩ
±0.1
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
Functional Description
1.
C1
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high passpass 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.
2.
C2
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high passpass 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.
3.
C3
Output capacitor. Low ESR ceramic capacitor (≤100mΩ)
4.
C4
Flying capacitor. Low ESR ceramic capacitor (≤100mΩ)
5.
C5
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.
6.
C6
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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LM48860
LM48860
Symbol
LM48860
Typical Performance Characteristics
THD+N vs Output Power
VDD = 3V, RL = 16Ω
f = 1kHz, 22kHz BW, one channel enabled
THD+N vs Output Power
VDD = 3V, RL = 16Ω, f = 1kHz
22kHz BW, two channels in phase
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THD+N vs Output Power
VDD = 3V, RL = 32Ω
f = 1kHz, 22kHz BW, one channel enabled
THD+N vs Output Power
VDD = 3V, RL = 32Ω, f = 1kHz
22kHz BW, two channels in phase
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THD+N vs Output Power
VDD = 3.6V, RL = 16Ω
f = 1kHz, 22kHz BW, one channel enabled
THD+N vs Output Power
VDD = 3.6V, RL = 16Ω, f = 1kHz
22kHz BW, two channels in phase
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LM48860
THD+N vs Output Power
VDD = 3.6V, RL = 32Ω
f = 1kHz, 22kHz BW, one channel enabled
THD+N vs Output Power
VDD = 3.6V, RL = 32Ω, f = 1kHz
22kHz BW, two channels in phase
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THD+N vs Output Power
VDD = 4.2V, RL = 16Ω
f = 1kHz, 22kHz BW, one channel enabled
THD+N vs Output Power
VDD = 4.2V, RL = 16Ω, f = 1kHz
22kHz BW, two channels in phase
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THD+N vs Output Power
VDD = 4.2V, RL = 32Ω, f = 1kHz
22kHz BW, two channels in phase
THD+N vs Output Power
VDD = 4.2V, RL = 32Ω
f = 1kHz, 22kHz BW, one channel enabled
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LM48860
THD+N vs Frequency
VDD = 3V, RL = 16Ω
PO = 20mW, 22kHz BW
THD+N vs Frequency
VDD = 3V, RL = 32Ω
PO = 20mW, 22kHz BW
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THD+N vs Frequency
VDD = 3.6V, RL = 16Ω
PO = 30mW, 22kHz BW
THD+N vs Frequency
VDD = 3.6V, RL = 32Ω
PO = 30mW, 22kHz BW
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THD+N vs Frequency
VDD = 4.2V, RL = 16Ω
PO = 30mW, 22kHz BW
THD+N vs Frequency
VDD = 4.2V, RL = 32Ω
PO = 30mW, 22kHz BW
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LM48860
PSRR vs Frequency
VDD = 3V, RL = 16Ω
VRIPPLE = 200mVPP
PSRR vs Frequency
VDD = 3V, RL = 32Ω
VRIPPLE = 200mVPP
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PSRR vs Frequency
VDD = 3.6V, RL = 16Ω
VRIPPLE = 200mVPP
PSRR vs Frequency
VDD = 3.6V, RL = 32Ω
VRIPPLE = 200mVPP
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PSRR vs Frequency
VDD = 4.2V, RL = 32Ω
VRIPPLE = 200mVPP
PSRR vs Frequency
VDD = 4.2V, RL = 16Ω
VRIPPLE = 200mVPP
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LM48860
Output Power vs Supply Voltage
RL = 16Ω, f = 1kHz, 22kHz BW
Output Power vs Supply Voltage
RL = 32Ω, f = 1kHz, 22kHz BW
30006886
30006885
Power Dissipation vs Output Power
VDD = 3V, RL = 16Ω, f = 1kHz
Power Dissipation vs Output Power
VDD = 3V, RL = 32Ω, f = 1kHz
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Power Dissipation vs Output Power
VDD = 5V, RL = 16Ω, f = 1kHz
Power Dissipation vs Output Power
VDD = 5V, RL = 32Ω, f = 1kHz
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LM48860
Supply Current vs Supply Voltage
VIN = GND, No Load
Power Derating Curve
VDD = 3V, RL = 16Ω
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Power Derating Curve
VDD = 3V, RL = 32Ω
Power Derating Curve
VDD = 5V, RL = 16Ω
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Power Derating Curve
VDD = 5V, RL = 32Ω
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LM48860
graph is greater than that of Equation 1, then either the supply
voltage must be decreased, the load impedance increased or
TA reduced (see power derating curves). For the application
of a 5V power supply, with a 16Ω load, the maximum ambient
temperature possible without violating the maximum junction
temperature is approximately 110°C provided that device operation is around the maximum power dissipation point. Power dissipation is a function of output power and thus, if typical
operation is not around the maximum power dissipation point,
the ambient temperature may be increased accordingly.
Application Information
SUPPLY VOLTAGE SEQUENCING
It is a good general practice to first apply the supply voltage
to a CMOS device before any other signal or supply on other
pins. This is also true for the LM48860 audio amplifier which
is a CMOS device.
Before applying any signal to the inputs or shutdown pins of
the LM48860, it is important to apply a supply voltage to the
VDD pins. After the device has been powered, signals may be
applied to the shutdown pins (see MICRO POWER SHUTDOWN) and input pins.
POWER SUPPLY BYPASSING
As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. Applications that employ a 3V power supply typically use
a 4.7µF capacitor in parallel with a 0.1µF ceramic filter capacitor to stabilize the power supply's output, reduce noise on
the supply line, and improve the supply's transient response.
Keep the length of leads and traces that connect capacitors
between the LM48860's power supply pin and ground as short
as possible.
ELIMINATING THE OUTPUT COUPLING CAPACITOR
The LM48860 features a low noise inverting charge pump that
generates an internal negative supply voltage. This allows the
outputs of the LM48860 to be biased about GND instead of a
nominal DC voltage, like traditional headphone amplifiers.
Because there is no DC component, the large DC blocking
capacitors (typically 220µF) are not necessary. The coupling
capacitors are replaced by two, small ceramic charge pump
capacitors, saving board space and cost.
Eliminating the output coupling capacitors also improves low
frequency response. In traditional headphone amplifiers, the
headphone impedance and the output capacitor form a high
pass filter that not only blocks the DC component of the output, but also attenuates low frequencies, impacting the bass
response. Because the LM48860 does not require the output
coupling capacitors, the low frequency response of the device
is not degraded by external components.
In addition to eliminating the output coupling capacitors, the
ground referenced output nearly doubles the available dynamic range of the LM48860 when compared to a traditional
headphone amplifier operating from the same supply voltage.
MICRO POWER SHUTDOWN
The voltage applied to the SD_LC (shutdown left channel) pin
and the SD_RC (shutdown right channel) pin controls the
LM48860’s shutdown function. When active, the LM48860’s
micropower shutdown feature turns off the amplifiers’ bias
circuitry, reducing the supply current. The trigger point is
0.45V for a logic-low level, and 1.2V for logic-high level. The
low 0.01µA (typ) shutdown current is achieved by applying a
voltage that is as near as ground a possible to the SD_LC/
SD_RC pins. A voltage that is higher than ground may increase the shutdown current. Do not let SD_LC/SD_RC float,
connect either to high or low.
SELECTING PROPER EXTERNAL COMPONENTS
Optimizing the LM48860's performance requires properly selecting external components. Though the LM48860 operates
well when using external components with wide tolerances,
best performance is achieved by optimizing component values.
OUTPUT TRANSIENT ('CLICK AND POPS') ELIMINATED
The LM48860 contains advanced circuitry that virtually eliminates output transients ('clicks and pops'). This circuitry prevents all traces of transients when the supply voltage is first
applied or when the part resumes operation after coming out
of shutdown mode.
Charge Pump Capacitor Selection
Use low ESR (equivalent series resistance) (<100mΩ) ceramic capacitors with an X7R dielectric for best performance.
Low ESR capacitors keep the charge pump output
impedance to a minimum, extending the headroom on the
negative supply. Higher ESR capacitors result in reduced
output power from the audio amplifiers.
Charge pump load regulation and output impedance are affected by the value of the flying capacitor (C4). A larger valued
C4 (up to 3.3uF) improves load regulation and minimizes
charge pump output resistance. Beyond 3.3uF, the switch-on
resistance dominates the output impedance.
The output ripple is affected by the value and ESR of the output capacitor (C3). Larger capacitors reduce output ripple on
the negative power supply. Lower ESR capacitors minimize
the output ripple and reduce the output impedance of the
charge pump.
The LM48860 charge pump design is optimized for 2.2uF, low
ESR, ceramic, flying and output capacitors.
AMPLIFIER CONFIGURATION EXPLANATION
As shown in Figure 2, the LM48860 has two internal operational amplifiers. The two amplifiers have internally configured
gain.
Since this is an output ground-referenced amplifier, the
LM48860 does not require output coupling capacitors.
POWER DISSIPATION
From the graph (THD+N vs Output Power , VDD = 3V, RL =
16Ω, f = 1kHz, 22kH BW, two channels in phase, page 6)
assuming a 3V power supply and a 16Ω load, the maximum
power dissipation point and thus the maximum package dissipation point is 281mW. The maximum power dissipation
point obtained must not be greater than the power dissipation
that results from Equation 1.
PDMAX = (TJMAX - TA) / (θJA)
(1)
Input Capacitor Value Selection
Amplifying the lowest audio frequencies requires high value
input coupling capacitors (C1 and C2 in Figure 1). A high value capacitor can be expensive and may compromise space
efficiency in portable designs. In many cases, however, the
For the micro SMD package θ JA = 59.3°C/W. TJMAX = 150°C
for the LM48860. Depending on the ambient temperature,
TA, of the system surroundings, Equation 1 can be used to
find the maximum internal power dissipation supported by the
IC packaging. If the maximum power dissipation from the
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fi-3dB = 1 / 2πRINC
(Hz)
(2)
The value of RIN can be found in the Electrical Characteristics tables.
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LM48860
speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 150Hz.
Applications using speakers with this limited frequency response reap little improvement by using high value input and
output capacitors.
As shown in Figure 1, the internal input resistor, Ri and the
input capacitors, C1 and C2, produce a -3dB high-pass filter
cutoff frequency that is found using Equation (2).
LM48860
Demonstration Board PCB Layout
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300068a4
Top Silkscreen
Top Layer
300068a3
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Midlayer 2
Midlayer 1
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LM48860
300068a1
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Bottom Silkscreen
Bottom Layer
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LM48860
Revision History
Rev
Date
1.0
01/16/08
Initial release.
1.01
01/29/08
Text edits.
1.02
02/14/08
Fixed typos (x-axis) on few curves.
1.03
10/17/08
Edited the X1 and X2 limits under the Physical Dimension section.
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Description
16
LM48860
Physical Dimensions inches (millimeters) unless otherwise noted
12 – Bump micro SMD
Order Number LM48860TL
NS Package Number TLA12XXX
X1 = 1.5±0.03mm, X2 = 2.0±0.03mm, X3 = 0.600±0.075mm,
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LM48860 Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier
Notes
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