Datasheet > A2211MS8VR

A2211MS8VR

更新时间： 2022-02-26 12:14:15

品牌	Logo	应用领域
创瑞 - AITSEMI		放大器功率放大器
页数	文件大小	规格书
17页	514K
描述
CLASS AB 1.25 W DIFFERENTIAL AUDIO POWER AMPLIFIER

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A2211MS8VR 数据手册

A2211

AiT Semiconductor Inc.

www.ait-ic.com

CLASS AB 1.25 W DIFFERENTIAL AUDIO POWER AMPLIFIER

WITH INTERNAL FEEDBACK CIRCUIT

DETAILED INFORMATION

Fully Differential Amplifier. The A2211 is a fully differential amplifier with differential inputs and outputs. The

fully differential amplifier consists of a differential amplifier and a common mode amplifier. The differential

amplifier ensures that the amplifier outputs a differential voltage that is equal to the differential input times the

gain. The common mode feedback ensures that the common-mode voltage at the output is biased around

V_DD/2 regardless of the common-mode voltage at the input.

Bridge – Tied - Load, BTL.. The A2211 provides a ꢀbridged modeꢁ output configuration (bridge-tied-load, BTL).

This means the output signals at V_OUT1 and V_OUT2 that at 180^oC out of phase with respect to each other.

Bridged mode operation is different from the single-ended output configuration that connects the load

between the amplifier output and ground. A bridged amplifier design has distinct advantages over the

single-ended output configuration: A2211 provides differential drive to the load, thus doubling maximum

possible output swing for a specific supply voltage. Four times the output power is possible compared with a

single-ended output configuration under the same conditions. This increase in attainable output power

assumes that the amplifier is not current limited or clipped.

CMRR. Input and output coupling capacitor not required: A fully differential amplifier with good CMRR, the

A2211 allows the input signal to be biased at voltage other than mid-supply of the A2211, the common-mode

feedback circuit adjust for it, and the outputs are still biased at mid-supply of the A2211.

Bypass Capacitor. Mid-supply bypass capacitor, C_Bnot required: The fully differential amplifier does not

require a bypass capacitor. It is because any shift in the mid-supply affects both positive and negative

channels equally and cancels the differential output. However, removing the bypass capacitor slightly

worsens power supply rejection ration, but a slightly decrease of PSRR may be acceptable when an

additional component can be eliminated.

Better RF-Immunity. GSM handsets save power by turning on and shutting off the RF transmitter at a rate of

217Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier

reduces the RF rectification much better than the typical audio amplifier.

See Fig 1, Fig 2 and Fig 3 show application schematics for differential and single-ended inputs.

REV1.2

- AUG 2006 RELEASED, OCT 2008 UPDATED -

- 9 -

1...6 7 8910 11 12...17

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与A2211MS8VR相关器件

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A2212	AITSEMI	获取价格	AUDIO AMPLIFIER
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A221F2001M	AMPHENOL	获取价格	Interconnection Device
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A221J15C0GF5UAA	ETC	获取价格	Leaded ceramic multilayer capacitors
A221J15C0GH5UAA	VISHAY	获取价格	Ceramic Capacitor, Multilayer, Ceramic, 100V, 5% +Tol, 5% -Tol, C0G, 30ppm/Cel TC, 0.00022
A221K15C0GF5TAA	VISHAY	获取价格	Axial Leaded Multilayer Ceramic Capacitors for General Purpose

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