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| 型號： | MAX9702ETI+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 1.8W D 28TQFN |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 系列： | DirectDrive® |
| 類型： | D 類 |
| 輸出類型： | 2-通道（立體聲）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： | 1.8W x 2 @ 4 歐姆; 45mW x 2 @ 32 歐姆 |
| 電源電壓： | 2.5 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，I²C，靜音，短路和熱保護(hù)，關(guān)機(jī) |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 封裝/外殼： | 28-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
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MAX9702
1.8W, Filterless, Stereo, Class D Audio Power
Amplifier and DirectDrive Stereo Headphone Amplifier
14
______________________________________________________________________________________
Detailed Description
The MAX9702 is a 1.8W, filterless, stereo Class D audio
power amplifier and DirectDrive stereo headphone
amplifier. The MAX9702 SSM amplifier features signifi-
cant improvements to switch-mode amplifier technolo-
gy. The MAX9702 offers Class AB performance with
Class D efficiency and minimal board space. The
device offers mix, mute, mono and stereo input modes,
eight selectable gains, and a low-power shutdown
mode—all programmable through an I2C interface.
The MAX9702 stereo headphone amplifier features
Maxim’s DirectDrive architecture, which eliminates the
large output-coupling capacitors required by conven-
tional single-supply headphone amplifiers. A negative
supply (VSS) is created internally by inverting the posi-
tive supply (CPVDD). Powering the amplifiers from
CPVDD and CPVSS increases the dynamic range of the
amplifiers to almost twice that of other single-supply
amplifiers, increasing the total available output power.
The DirectDrive outputs of the MAX9702 are biased at
GND (see Figure 7). The benefit of this 0V bias is that
the amplifier outputs do not have a DC component,
eliminating the need for large DC-blocking capacitors.
Eliminating the DC-blocking capacitors on the output
saves board space, system cost, and improves fre-
quency response.
The MAX9702 features extensive click-and-pop sup-
pression circuitry on both speaker and headphone
amplifiers to eliminate audible clicks-and-pops on start-
up and shutdown.
The MAX9702 features an input multiplexer/mixer that
allows three different audio sources to be selected or
mixed. An I2C-compatible interface allows serial com-
munication between the MAX9702 and a microcon-
troller. The MAX9702 is available with two different I2C
addresses allowing two MAX9702s to share the same
bus (see Table 2). The internal command register con-
trols the shutdown status of the MAX9702, sets the
maximum gain of the amplifier, and controls the
mono/stereo/mixed/mute MUX inputs (see Table 3).
Class D Speaker Amplifier
Spread-spectrum modulation and synchronizable
switching frequency significantly reduce EMI emis-
sions. Comparators monitor the audio inputs and com-
pare the complementary input voltages to a sawtooth
waveform. The comparators trip when the input magni-
tude of the sawtooth exceeds their corresponding input
voltage. Both comparators reset at a fixed time after the
rising edge of the second comparator trip point, gener-
ating a minimum-width pulse (tON(MIN),100ns typ) at
the output of the second comparator (Figure 1). As the
input voltage increases or decreases, the duration of
the pulse at one output increases while the other output
pulse duration remains the same. This causes the net
voltage across the speaker (VOUT+ - VOUT-) to change.
The minimum-width pulse helps the device to achieve
high levels of linearity.
Operating Modes
Fixed-Frequency (FFM) Mode
The MAX9702 features two fixed-frequency modes.
Connect SYNC to GND to select a 1.1MHz switching fre-
quency. Float SYNC to select a 1.34MHz switching fre-
quency. The frequency spectrum of the MAX9702
consists of the fundamental switching frequency and its
associated harmonics (see the Wideband FFT graph in
Typical Operating Characteristics). Program the switch-
ing frequency such that the harmonics do not fall within
a sensitive frequency band (Table 1). Audio reproduc-
tion is not affected by changing the switching frequency.
Spread-Spectrum (SSM) Mode
The MAX9702 features a unique spread-spectrum
mode that flattens the wideband spectral components,
improving EMI emissions that may be radiated by the
speaker and cables. This mode is enabled by setting
SYNC = VDD to enable SSM (Table 1). In SSM mode,
the switching frequency varies randomly by ±50kHz
around the center frequency (1.15MHz). The modula-
tion scheme remains the same, but the period of the
sawtooth waveform changes from cycle to cycle
(Figure 2). Instead of a large amount of spectral energy
present at multiples of the switching frequency, the
energy is now spread over a bandwidth that increases
with frequency. Above a few megahertz, the wideband
spectrum looks like white noise for EMI purposes
(Figure 3). A proprietary amplifier topology ensures this
does not corrupt the noise floor in the audio bandwidth.
Table 1. Operating Modes
SYNC
MODE
GND
FFM with fOSC = 1100kHz
FLOAT
FFM with fOSC = 1340kHz
VDD
SSM with fOSC = 1150kHz ±50kHz
Clocked
FFM with fOSC = external clock
frequency
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9702ETI+ | 功能描述:音頻放大器 1.8W Filterless Class D Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9702ETI+T | 功能描述:音頻放大器 1.8W Filterless Class D Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9702EUI+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 2CH STEREO 1.8W/0.045W CLS-AB/CLS-D 28TSSO - Rail/Tube |
| MAX9702EUI+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 2CH STEREO 1.8W/0.045W CLS-AB/CLS-D 28TSSO - Tape and Reel |
| MAX9702EVCMODU | 功能描述:放大器 IC 開發(fā)工具 MAX9702/2B Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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