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LM4664 Datasheet(Fiches technique) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4664
Description  Filterless High Efficiency 1.1W Switching Audio Amplifier
Télécharger  14 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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Electrical Characteristics V
DD =5V
(Notes 1, 2)
The following specifications apply for V
DD = 5V and RL =15µH+8
Ω + 15µH unless otherwise specified. Limits apply for T
A =
25˚C.
Symbol
Parameter
Conditions
LM4664
Units
(Limits)
Typical
Limit
(Note 6)
(Notes 7, 8)
I
DD
Quiescent Power Supply Current
V
IN = 0V, No Load
V
IN = 0V, RL =15µH+8
Ω + 15µH
8
9
mA
mA
I
SD
Shutdown Current
V
SD = GND (Note 9)
0.4
µA
V
SDIH
Shutdown Voltage Input High
1.2
V
V
SDIL
Shutdown Voltage Input Low
1.1
V
V
GSIH
Gain Select Input High
1.2
V
V
GSIL
Gain Select Input Low
1.1
V
A
V
Closed Loop Gain
V
Gain Select =VDD
6dB
A
V
Closed Loop Gain
V
Gain Select = GND
12
dB
V
OS
Output Offset Voltage
10
mV
T
WU
Wake-up Time
7
ms
P
o
Output Power
THD = 2% (max); f = 1kHz
1.1
W
THD+N
Total Harmonic Distortion+Noise
P
O = 100mWRMS;fIN = 1kHz
0.8
%
R
IN
Differential Input Resistance
V
Gain Select =VDD
90
k
V
Gain Select = GND
60
k
PSRR
Power Supply Rejection Ratio
V
ripple = 100mVRMS sine wave
Inputs terminated to GND
55
(f = 217Hz)
dB
V
Ripple = 100mVRMS sine wave
P
OUT = 10mW,1kHz
65
(f = 217Hz)
dB
CMRR
Common Mode Rejection Ratio
V
Ripple = 100mVRMS,
f
Ripple = 217Hz
41
dB
SNR
Signal to Noise Ratio
P
O =1WRMS, A-Weighted Filter
83
dB
e
OUT
Output Noise
A-Weighted filter, V
in = 0V
200
µV
Note 1: All voltages are measured with respect to the ground 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 LM4664, TJMAX = 150˚C.
The typical
θJA is 220˚C/W for the microSMD package.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model, 220pF–240pF discharged through all pins.
Note 6: Typical specifications are specified at 25˚C and represent the parametric norm.
Note 7: Tested 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: Shutdown current is measured in a normal room environment. Exposure to direct sunlight will increase ISD by a maximum of 2µA. The Shutdown pin should
be driven as close as possible to GND for minimal shutdown current and to VDD for the best THD performance in PLAY mode. See the Application Information
section under SHUTDOWN FUNCTION for more information.
External Components Description
(Figure 1)
Components
Functional Description
1.
C
S
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.
2.
C
I
Input AC coupling capacitor which blocks the DC voltage at the amplifier’s input terminals.
www.national.com
4




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