The following specificatio" />
參數(shù)資料
型號(hào): LM4855ITLX/NOPB
廠商: National Semiconductor
文件頁(yè)數(shù): 25/27頁(yè)
文件大?。?/td> 0K
描述: IC AMP AUDIO PWR 1.5W AB 18USMD
標(biāo)準(zhǔn)包裝: 3,000
系列: Boomer®
類型: AB 類
輸出類型: 1-通道(單聲道),帶立體聲耳機(jī)
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量: 1.5W x 1 @ 4 歐姆; 115mW x 2 @ 32 歐姆
電源電壓: 2.6 V ~ 5 V
特點(diǎn): 消除爆音,靜音,關(guān)機(jī),SPI,熱保護(hù),音量控制
安裝類型: 表面貼裝
供應(yīng)商設(shè)備封裝: 18-uSMD
封裝/外殼: 18-WFBGA
包裝: 帶卷 (TR)
其它名稱: LM4855ITLX
SNAS164C – JUNE 2002 – REVISED MAY 2013
3V Electrical Characteristics
(1)(2) (continued)
The following specifications apply for VDD= 3.0V, TA= 25°C unless otherwise specified.
Symbol
Parameter
Conditions
LM4855
Units
(Limits)
Typical
Limits
(3)
(4)
Input referred minimum gain
-34.5
-35.1
dB (min)
-33.9
dB (max)
Digital Volume Range (RIN and LIN)
Input referred maximum gain
12.0
11.4
dB (min)
12.6
dB (max)
Digital Volume Stepsize
1.5
dB
Digital Volume Stepsize Error
±0.1
±0.6
dB ( max)
Phone_In_IHF Volume
BTL gain from Phone_In _IHF to SPKROUT
12
11.4
dB (min)
12.6
dB (max)
Phone _In_IHF Mute Attenuation
Output Mode 2, 4, 6
80
72
dB (min)
Phone_In_IHF Input Impedance
20
15
k
(min)
25
k
(max)
Maximum gain setting
50
37.5
k
(min)
62.5
k
(max)
Phone_In_HS Input Impedance
Mininum gain setting
100
75
k
(min)
125
k
(max)
Maximum gain setting
33.5
25
k
(min)
42
k
(max)
RIN and LIN Input Impedance
Mininum gain setting
100
75
k
(min)
125
k
(max)
tSD
Thermal Shutdown Temperature
170
150
°C (min)
tES
Enable Setup Time (ENB)
20
ns (min)
tEH
Enable Hold Time (ENB)
20
ns (min)
tEL
Enable Low Time (ENB)
30
ns (min)
tDS
Data Setup Time (DATA)
20
ns (min)
tDH
Data Hold Time (DATA)
20
ns (min)
tCS
Clock Setup Time (CLK)
20
ns (min)
tCH
Clock Logic High Time (CLK)
50
ns (min)
tCL
Clock Logic Low Time (CLK)
50
ns (min)
fCLK
Clock Frequency
DC
(min)
10
MHz (max)
External Components Description
Components
Functional Description
1.
CIN
This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the amplifier's input terminals.
CIN also creates a highpass filter with the internal resistor Ri (Input Impedance) at fc = 1/(2πRiCIN).
2.
CS
This is the supply bypass capacitor. It filters the supply voltage applied to the VDD pin and helps maintain the LM4855's
PSRR.
3.
CB
This is the BYPASS pin capacitor. It filters the VDD / 2 voltage and helps maintain the LM4855's PSRR.
Copyright 2002–2013, Texas Instruments Incorporated
7
Product Folder Links: LM4855
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