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參數資料
| 型號： | LM4892 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1 Watt Audio Power Amplifier with Headphone Sense |
| 中文描述： | 1瓦音頻功率放大器意識與耳機 |
| 文件頁數： | 4/22頁 |
| 文件大小： | 1037K |
| 代理商： | LM4892 |
Electrical Characteristics V
DD
= 3.3V
(Notes 1, 2)
The following specifications apply for V
DD
= 3.3V, A
V
= 2, and 8
load unless otherwise specified. Limits apply for T
A
=
25C. (Continued)
Symbol
Parameter
Conditions
LM4892
Units
(Limits)
Typical
(Note 6)
60(f = 217Hz)
62 (f = 1kHz)
Limit
(Note 7)
PSSR
Power Supply Rejection Ratio
V
ripple
= 200mV sine p-p
dB
Electrical Characteristics V
DD
= 2.6V
The following specifications apply for V
DD
= 2.6V, A
V
= 2, and 8
load unless otherwise specified. Limits apply for T
A
= 25C.
(Notes 1, 2)
Symbol
Parameter
Conditions
LM4892
Units
(Limits)
Typical
(Note 6)
2.6
1.5
0.1
Limit
(Note 7)
I
DD
Quiescent Power Supply Current
V
IN
= 0V, I
o
= 0A, HP sense = 0V
V
IN
= 0V, I
o
= 0A, HP sense = 2.6V
Vshutdown = GND (Note 8)
THD = 1% (max), f = 1kHz,
R
L
= 8
, HP Sense
<
0.8V
THD = 1% (max), f = 1kHz,
R
L
= 4
, HP Sense
<
0.8V
THD = 1% (max), f = 1kHz, R
L
=
32
, HP Sense
>
2.5V
mA (max)
mA (max)
μA (max)
I
SD
Shutdown Current
P
o
Output Power
0.25
W
0.28
W
20
mW
V
IH
V
IL
THD+N
HP Sense high input voltage
HP Sense low input voltage
Total Harmonic Distortion+Noise
2.0
0.8
V (min)
V (max)
%
P
o
= 0.1 W
rms
; f = 1kHz 10Hz
≤
BW
≤
80kHz
V
ripple
= 200mV sine p-p
0.1
PSSR
Power Supply Rejection Ratio
44(f = 217Hz)
44 (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 andAC 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
,
θ
, and the ambient temperature T
. The maximum
allowable power dissipation is P
= (T
JMAX
–T
A
)/
θ
JA
or the number given inAbsolute Maximum Ratings, whichever is lower. For the LM4892, see power derating
currents for additional information.
Note 4:
Human body model, 100pF discharged through a 1.5k
resistor.
Note 5:
Machine Model, 220pF–240pF discharged through all pins.
Note 6:
Typicals are measured at 25C and represent the parametric norm.
Note 7:
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 8:
For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I
SD
by a maximum of 2μA.
Note 9:
The Exposed-DAP of the LDA10B package should be electrically connected to GND or an electrically isolated copper area. The LM4892LD demo board
(views featured in the
Application Information
section) has the Exposed-DAP connected to GND with a PCB area of 353mils x 86.7mils (8.97mm x 2.20mm) on
the copper top layer and 714.7mils x 368mils (18.15mm x 9.35mm) on the copper bottom layer.
External Components Description
(
Figure 1
)
Components
1.
Functional Description
R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a
high pass filter with C
i
at f
C
= 1/(2
π
R
i
C
i
).
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
i
at f
c
= 1/(2
π
R
i
C
i
). Refer to the section,
Proper Selection of External Components
,
for an explanation of how to determine the value of C
i
.
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
2.
C
i
3.
R
f
L
www.national.com
4
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相關代理商/技術參數 |
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| LM48920B WAF | 制造商:Texas Instruments 功能描述: |
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| LM4892IBP | 功能描述:IC AMP AUDIO PWR 1W MONO 8USMD RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4892IBPX | 制造商:Rochester Electronics LLC 功能描述:1W AUDIO AMP WITH HEADPHONE SE - Bulk |
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