Datasheet > MAX9700AEUB+

MAX9700AEUB+

更新时间： 2024-01-10 23:20:01

品牌	Logo	应用领域
美信 - MAXIM		放大器信息通信管理光电二极管商用集成电路
页数	文件大小	规格书
17页	2049K
描述
1.2W, Low-EMI, Filterless, Class D Audio Amplifier

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技术参数
数据手册
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MAX9700AEUB+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP, TSSOP10,.19,20	针数：	10
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.33.00.01	风险等级：	0.84
标称带宽：	22 kHz	商用集成电路类型：	AUDIO AMPLIFIER
增益：	6 dB	JESD-30 代码：	S-PDSO-G10
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	信道数量：	1
功能数量：	1	端子数量：	10
最高工作温度：	85 °C	最低工作温度：	-40 °C
标称输出功率：	0.8 W	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP10,.19,20
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	电源：	3.3/5 V
认证状态：	Not Qualified	座面最大高度：	1.1 mm
子类别：	Audio/Video Amplifiers	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	2.5 V	表面贴装：	YES
技术：	BICMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3 mm
Base Number Matches：	1

MAX9700AEUB+ 数据手册

MAX9700

1.2W, Low-EMI, Filterless,

Class D Audio Ampliﬁer

power conversion of the class D amplifier. For example,

an 8mV DC offset across an 8Ω load results in 1mA extra

current consumption in a class AB device. In the class

D case, an 8mV offset into 8Ω equates to an additional

power drain of 8μW. Due to the high efficiency of the

class D amplifier, this represents an additional quiescent-

1µF

SINGLE-ENDED

AUDIO INPUT

IN+

IN-

MAX9700

current draw of 8μW/(V /100η), which is on the order of

1µF

a few microamps.

Input Ampliﬁer

Diﬀerential Input

Figure 6. Single-Ended Input

The MAX9700 features a differential input structure,

making it compatible with many CODECs, and offering

improved noise immunity over a single-ended input ampli-

fier. In devices such as cellular phones, high-frequency

signals from the RF transmitter can be picked up by the

amplifier’s input traces. The signals appear at the ampli-

fier’s inputs as common-mode noise. A differential input

amplifier amplifies the difference of the two inputs; any

signal common to both inputs is canceled.

whose dielectrics have low-voltage coefficients, such as

tantalum or aluminum electrolytic. Capacitors with high-

voltage coefficients, such as ceramics, may result in

increased distortion at low frequencies.

Other considerations when designing the input filter

include the constraints of the overall system and the

actual frequency band of interest. Although high-fidelity

audio calls for a flat gain response between 20Hz and

20kHz, portable voice-reproduction devices such as cellu-

lar phones and two-way radios need only concentrate on

the frequency range of the spoken human voice (typically

300Hz to 3.5kHz). In addition, speakers used in portable

devices typically have a poor response below 150Hz.

Taking these two factors into consideration, the input

filter may not need to be designed for a 20Hz to 20kHz

response, saving both board space and cost due to the

use of smaller capacitors.

Single-Ended Input

The MAX9700 can be configured as a single-ended input

amplifier by capacitively coupling either input to GND and

driving the other input (Figure 6).

DC-Coupled Input

The input amplifier can accept DC-coupled inputs that

are biased within the amplifier’s common-mode range

(see the Typical Operating Characteristics). DC coupling

eliminates the input-coupling capacitors, reducing compo-

nent count to potentially one external component (see the

System Diagram). However, the low-frequency rejection

of the capacitors is lost, allowing low-frequency signals to

feedthrough to the load.

Output Filter

The MAX9700 does not require an output filter. The

device passes FCC emissions standards with 100mm

of unshielded speaker cables. However, output filter-

ing can be used if a design is failing radiated emissions

due to board layout or cable length, or the circuit is near

EMI-sensitive devices. Use an LC filter when radiated

emissions are a concern, or when long leads are used to

connect the amplifier to the speaker.

Component Selection

Input Filter

An input capacitor, C , in conjunction with the input

impedance of the MAX9700 forms a highpass filter that

removes the DC bias from an incoming signal. The

AC-coupling capacitor allows the amplifier to bias the sig-

nal to an optimum DC level. Assuming zero source imped-

ance, the -3dB point of the highpass filter is given by:

Supply Bypassing/Layout

Proper power-supply bypassing ensures low-distortion

operation. For optimum performance, bypass V

GND and PV

to PGND with separate 0.1μF capacitors

as close to each pin as possible. A low-impedance, high-

current power-supply connection to PV is assumed.

−3dB

2πR C

IN IN

Additional bulk capacitance should be added as required

depending on the application and power-supply charac-

teristics. GND and PGND should be star connected to

system ground. Refer to the MAX9700 evaluation kit for

layout guidance.

Choose C

so f

is well below the lowest fre-

-3dB

quency of interest. Setting f

too high affects the

-3dB

low-frequency response of the amplifier. Use capacitors

Maxim Integrated

│ 12

www.maximintegrated.com

1...9 10 111213 14 15...17

中文翻译

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MAX9700AEUB+ 替代型号

型号	品牌	替代类型	描述	数据表
MAX9700AEUB	MAXIM	功能相似	1.2W, Low-EMI, Filterless, Class D Audio Amplifier

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MAX9700AEUB+T	MAXIM	Audio Amplifier, 0.8W, 1 Channel(s), 1 Func, BICMOS, PDSO10, MO-187C-BA, UMAX-10	获取价格
MAX9700AEUB-T	MAXIM	Audio Amplifier, 1.6W, 1 Channel(s), 1 Func, BICMOS, PDSO10, MO-187CBA, MICRO, SOP-10	获取价格
MAX9700B	MAXIM	Selectable Switching Frequency	获取价格
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MAX9700BEBC+T	MAXIM	1.2W, Low-EMI, Filterless, Class D Audio Amplifier	获取价格
MAX9700BEBC-T	MAXIM	1.2W, Low-EMI, Filterless, Class D Audio Amplifier	获取价格

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