Datasheet > TFA9871UK/N1Z

TFA9871UK/N1Z

更新时间： 2024-11-14 20:55:23

品牌	Logo	应用领域
恩智浦 - NXP		放大器商用集成电路
页数	文件大小	规格书
24页	274K
描述
Audio Amplifier

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TFA9871UK/N1Z 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	,	Reach Compliance Code：	compliant
风险等级：	5.77	商用集成电路类型：	AUDIO AMPLIFIER
湿度敏感等级：	1	Base Number Matches：	1

TFA9871UK/N1Z 数据手册

TFA9871

High Efficiency Class-D Audio Amplifier

Rev. 1 — 14 August 2018

Product data sheet

1 General description

The TFA9871 is a high efficiency 8.5 V boosted class-D audio amplifier. It can deliver up

to 8 W peak output power into an 8 Ω speaker and up to 10 W peak output power into

a 6 Ω speaker, at a supply voltage of 4.0 V. The internal adaptive DC-to-DC converter

raises the supply voltage up to 8.5 V, providing ample headroom for major improvements

in sound quality.

Internal adaptive DC-to-DC conversion boosts the supply rail to provide additional

headroom and power output. The supply voltage is only raised when necessary. This

maximizes the output power of the class-D audio amplifier while limiting quiescent power

consumption.

The device can be configured to drive either a hands-free speaker (4 Ω to 8 Ω) for audio

playback, or a receiver speaker (32 Ω), for handset playback, allowing it to be embedded

in platforms supporting both a hands-free speaker and a handset speaker. The maximum

output power and the noise levels are lower in handset call use case than in hands-free

call use case.

The TFA9871 also incorporates battery protection. By limiting the supply current when

the battery voltage is low, it prevents the audio system from drawing excessive load

currents from the battery, which could cause a system under voltage. This circuitry

minimizes the impact of a falling battery voltage by preventing unexpected device switch

off due to excessive current drawn from the battery.

The device features low RF susceptibility because it has a digital input interface that

is insensitive to clock jitter. The second order closed loop architecture used in a class-

D audio amplifier provides excellent audio performance and high supply voltage ripple

rejection. The audio input interface is TDM and the control settings are communicated via

an I²C-bus interface.

The TFA9871 is available in a 36-bump WLCSP (Wafer Level Chip-Size Package) with a

400 μm pitch.

2 Features and benefits

• High output power: 4.1 W (average) into 8 Ω at 4.0 V supply voltage (THD = 1 %)

• Supports handset (16 Ω or 32 Ω) and hands-free (4 Ω to 8 Ω) speaker configurations

• High efficiency, low power dissipation and low-noise speaker driver

• Adaptive DC-to-DC converter increases the supply voltage smoothly when switching

between Fixed Boost and Adaptive Boost modes, preventing large battery supply

spikes and limiting quiescent power consumption

• Wide supply voltage range (fully operational from 2.7 V to 5.5 V)

• Very low noise output voltage <15 μV with -60 dBFS input at f_s= 48 kHz)

• Low battery current consumption <118 mA (P_o= 380 mW, average music power)

• I²C-bus control interface (400 kHz)

12 3 4 5 6 7...24

中文翻译

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与TFA9871UK/N1Z相关器件

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TFA9879	NXP	获取价格	Mono BTL class-D audio amplifier for portable applications with digital input
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