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参数资料
| 型号： | LM4855IBL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 6/27页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 1.5W AB 18USMD |
| 标准包装： | 1 |
| 系列： | Boomer® |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道），带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 1.5W x 1 @ 4 欧姆; 115mW x 2 @ 32 欧姆 |
| 电源电压： | 2.6 V ~ 5 V |
| 特点： | 消除爆音，静音，关机，SPI，热保护，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 18-uSMD |
| 封装/外壳： | 18-VFBGA |
| 包装： | 标准包装 |
| 其它名称： | LM4855IBLDKR |
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SNAS164C – JUNE 2002 – REVISED MAY 2013
APPLICATION INFORMATION
SPI PIN DESCRIPTION
DATA: This is the serial data input pin.
CLK: This is the clock input pin.
ENB: This is the SPI enable pin and is active-high.
SPI OPERATION DESCRIPTION
The serial data bits are organized into a field which contains 8 bits of data defined by Table 2. The Data 0 to
Data 2 bits determine the output mode of the LM4855 as shown in Table 3. The Data 3 to Data 7 bits determine
the volume level setting as illustrated by Table 4. For each SPI transfer, the data bits are written to the DATA pin
with the least significant bit (LSB) first. All serial data are sampled at the rising edge of the CLK signal. Once all
the data bits have been sampled, ENB transitions from logic-high to logic-low to complete the SPI sequence. All
8 bits must be received before any data latch can occur. Any excess CLK and DATA transitions will be ignored
after the eighth rising clock edge has occurred. For any data sequence longer than 8 bits, only the first 8 bits will
get loaded into the shift register and the rest of the bits will be disregarded.
Table 2. Bit Allocation
Data 0
Mode Select
Data 1
Mode Select
Data 2
Mode Select
Data 3
Volume Control
Data 4
Volume Control
Data 5
Volume Control
Data 6
Volume Control
Data 7
Volume Control
Table 3. Output Mode Selection(1)
Output Mode #
Data 2
Data 1
Data 0
SPKROUT
ROUT
LOUT
0
SD
1
0
1
12dB x PIHF
SD
2
0
1
0
MUTE
G1 x PHS
3
0
1
12dB x PIHF
G1 x PHS
4
1
0
MUTE
G2 x R
G2 x L
5
1
0
1
12dB x PIHF
G2 x R
G2 x L
6
1
0
MUTE
(G1 x PHS) + (G2
x R)
x L)
7
1
12dB x PIHF
(G1 x PHS) + (G2
x R)
x L)
(1)
R = Rin
L = Lin
PIHF = Phone_In_IHF
PHS = Phone_In_HS
SD = Shutdown Mode
MUTE = Mute Mode
G1 = gain from PHS to LOUT/ROUT
G2 = gain from LIN/ RIN to LOUT/ROUT
Default Mode upon device power-up is Output Mode 0
14
Copyright 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM4855
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相关代理商/技术参数 |
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|---|---|
| LM4855ITL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:IC AMP AUDIO 1W MONO SMD 4855 |
| LM4855ITL/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4855ITLX | 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 1.1W Class-AB 18-Pin uSMD T/R |
| LM4855ITLX/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4855LQ | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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