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LM4990LD Scheda tecnica(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM4990LD
Spiegazioni elettronici  2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
Download  19 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4990LD Scheda tecnica(HTML) 5 Page - National Semiconductor (TI)

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Electrical Characteristics V
DD =3V (Notes 1, 2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
A =
25˚C. (Continued)
Symbol
Parameter
Conditions
LM4990
Units
(Limits)
Typical
Limit
(Note 6)
(Notes 7, 9)
P
o
Output Power (8
Ω)
THD+N = 1% (max); f = 1kHz
425
mW
(4
Ω)
THD+N = 1% (max); f = 1kHz
600
mW
T
WU
Wake-up time
75
ms
THD+N+N Total Harmonic Distortion+Noise
P
o = 0.25Wrms; f = 1kHz
0.1
%
PSRR
Power Supply Rejection Ratio
V
ripple = 200mV sine p-p
Input terminated with 10
62 (f =
217Hz)
68 (f = 1kHz)
55
dB (min)
Electrical Characteristics V
DD = 2.6V
(Notes 1, 2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
A = 25˚C.
Symbol
Parameter
Conditions
LM4990
Units
(Limits)
Typical
Limit
(Note 6)
(Notes 7, 9)
I
DD
Quiescent Power Supply Current
V
IN = 0V, Io = 0A, No Load
2.0
mA
V
IN = 0V, Io = 0A, 8
Ω Load
3.0
mA
I
SD
Shutdown Current
V
SD =VSD Mode (Note 8)
0.1
µA
V
SDIH
Shutdown Voltage Input High
V
SD MODE =VDD
1.0
V
V
SDIL
Shutdown Voltage Input Low
V
SD MODE =VDD
0.9
V
V
SDIH
Shutdown Voltage Input High
V
SD MODE = GND
1.2
V
V
SDIL
Shutdown Voltage Input Low
V
SD MODE = GND
1.0
V
V
OS
Output Offset Voltage
5
50
mV (max)
R
OUT
Resistor Output to GND (Note 10)
8.5
9.7
k
Ω (max)
7.0
k
Ω (min)
P
o
Output Power ( 8
Ω )
THD+N = 1% (max); f = 1kHz
300
mW
(4
Ω )
THD+N = 1% (max); f = 1kHz
400
T
WU
Wake-up time
70
ms
THD+N+N Total Harmonic Distortion+Noise
P
o = 0.15Wrms; f = 1kHz
0.1
%
PSRR
Power Supply Rejection Ratio
V
ripple = 200mV sine p-p
Input terminated with 10
51 (f =
217Hz)
51 (f = 1kHz)
dB
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 LM4990, see power derating
curves for additional information.
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: 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: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase ISD by a maximum of 2µA.
Note 9: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 10: RROUT is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the two 20kΩ resistors.
Note 11: If the product is in Shutdown mode and VDD exceeds 6V (to a max of 8V VDD), then most of the excess current will flow through the ESD protection circuits.
If the source impedance limits the current to a max of 10mA, then the device will be protected. If the device is enabled when VDD is greater than 5.5V and less than
6.5V, no damage will occur, although operation life will be reduced. Operation above 6.5V with no current limit will result in permanent damage.
Note 12: Maximum power dissipation in the device (PDMAX) occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 1 shown in the Application Information section. It may also be obtained from the power dissipation graphs.
www.national.com
5


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