lm4664 National Semiconductor Corporation, lm4664 Datasheet - Page 4

• Manufacturer Part Number: lm4664
• Description: Filterless High Efficiency 1.1w Switching Audio Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
I
I
V
V
V
V
A
A
V
T
P
THD+N
R
PSRR
CMRR
SNR
e
DD
SD
Symbol
OUT
WU
SDIH
SDIL
GSIH
GSIL
V
V
OS
o
IN
Electrical Characteristics V
The following specifications apply for V
25˚C.
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 T
allowable power dissipation is P
The typical θ
Note 4: Human body model, 100pF discharged through a 1.5kΩ 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 I
be driven as close as possible to GND for minimal shutdown current and to V
section under SHUTDOWN FUNCTION for more information.
External Components Description
( Figure 1 )
Components
1.
2.
Quiescent Power Supply Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Gain Select Input High
Gain Select Input Low
Closed Loop Gain
Closed Loop Gain
Output Offset Voltage
Wake-up Time
Output Power
Total Harmonic Distortion+Noise
Differential Input Resistance
Power Supply Rejection Ratio
Common Mode Rejection Ratio
Signal to Noise Ratio
Output Noise
JA
is 220˚C/W for the microSMD package.
C
C
S
I
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.
Input AC coupling capacitor which blocks the DC voltage at the amplifier’s input terminals.
Parameter
DMAX
= (T
JMAX
–T
DD
A
)/θ
JA
= 5V and R
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4664, T
DD
V
V
V
V
V
THD = 2% (max); f = 1kHz
P
V
V
V
Inputs terminated to GND
V
P
V
f
P
A-Weighted filter, V
Ripple
IN
IN
SD
Gain Select
Gain Select
O
Gain Select
Gain Select
ripple
Ripple
OUT
Ripple
O
= 5V
= 100mW
= 1W
= 0V, No Load
= 0V, R
= GND (Note 9)
= 10mW,1kHz
= 217Hz
= 100mV
L
= 100mV
= 100mV
= 15µH + 8Ω + 15µH unless otherwise specified. Limits apply for T
RMS
= V
= GND
= V
= GND
L
Conditions
, A-Weighted Filter
(Notes 1, 2)
= 15µH + 8Ω + 15µH
RMS
DD
Functional Description
DD
DD
RMS
4
RMS
RMS
for the best THD performance in PLAY mode. See the Application Information
; f
IN
in
,
sine wave
sine wave
= 0V
= 1kHz
JMAX
, θ
(f = 217Hz)
(f = 217Hz)
SD
JA
(Note 6)
Typical
, and the ambient temperature T
by a maximum of 2µA. The Shutdown pin should
200
0.4
1.2
1.1
1.2
1.1
1.1
0.8
12
10
90
60
55
65
41
83
8
9
6
7
LM4664
(Notes 7, 8)
Limit
A
. The maximum
JMAX
(Limits)
Units
= 150˚C.
mA
mA
mV
ms
kΩ
kΩ
µA
dB
dB
dB
dB
dB
dB
µV
W
%
V
V
V
V
A
=