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參數(shù)資料
| 型號： | LM4891MBD |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 18/21頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM4891M |
| 標準包裝： | 1 |
| 系列： | Boomer® |
| 放大器類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 1W x 1 @ 8 歐姆 |
| 電源電壓： | 2.2 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | LM4891 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LM4891MX-ND - IC AMP AUDIO PWR 1W MONO 8SOIC LM4891MMTR-ND - IC AMP AUDIO PWR 1W MONO 8MSOP LM4891M-ND - IC AMP AUDIO PWR 1W MONO 8SOIC |
OBSOLETE
SNAS122E – MAY 2001 – REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS VDD = 2.6V
(1)(2)(3) (continued)
The following specifications apply for VDD = 2.6V, AV = 2, and 8 Load unless otherwise specified. Limits apply for TA = 25°C.
LM4891
Units
Symbol
Parameter
Conditions
Typical
Limit
(Limits)
(4)
(5)
PO
Output Power ( 8
)
THD = 1% (max); f = 1 kHz THD =
0.25
W
Output Power ( 4
)
1% (max); f = 1 kHz
0.28
W
THD+N
Total Harmonic Distortion+Noise
Po = 0.1Wrms; f = 1kHz
0.08
%
PSRR(6)
Power Supply Rejection Ratio
Vripple = 200mV sine p-p
44 (f = 217Hz)
dB
44 (f = 1kHz)
(6)
PSRR is a function of system gain. Specifications apply to the circuit in Figure 1 where AV = 2. Higher system gains will reduce PSRR
value by the amount of gain increase. A system gain of 10 represents a gain increase of 14dB. PSRR will be reduced by 14dB and
applies to all operating voltages.
EXTERNAL COMPONENTS DESCRIPTION
Components(1)
Functional Description
1.
Ri
Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a high pass
filter with Ci at fC= 1/(2π RiCi).
2.
Ci
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with
Ri at fc = 1/(2π RiCi). Refer to the section, PROPER SELECTION OF EXTERNAL COMPONENTS, for an explanation
of how to determine the value of Ci.
3.
Rf
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
4.
CS
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.
5.
CB
Bypass pin capacitor which provides half-supply filtering. Refer to the section, PROPER SELECTION OF EXTERNAL
(1)
ROUT is measured from each of the output pins to ground. This value represents the parallel combination of the 10k ohm output
resistors and the two 20k ohm resistors.
6
Copyright 2001–2013, Texas Instruments Incorporated
Product Folder Links: LM4891
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