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參數(shù)資料
| 型號(hào)： | MAX9704ETJ+T |
| 廠(chǎng)商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 3/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 16W STER 32TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | D 類(lèi) |
| 輸出類(lèi)型： | 2 通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 16W x 2 @ 16 歐姆 |
| 電源電壓： | 10 V ~ 25 V |
| 特點(diǎn)： | 消除爆音，差分輸入，靜音，短路和熱保護(hù)，關(guān)機(jī) |
| 安裝類(lèi)型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFN-EP（7x7） |
| 封裝/外殼： | 32-WQFN 裸露焊盤(pán) |
| 包裝： | 帶卷 (TR) |
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MAX9703/MAX9704
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
______________________________________________________________________________________
11
Gain Selection
The MAX9703/MAX9704 feature an internally set, logic-
selectable gain. The G1 and G2 logic inputs set the
gain of the MAX9703/MAX9704 speaker amplifier
(Table 2).
Output Offset
Unlike a Class AB amplifier, the output offset voltage of
Class D amplifiers does not noticeably increase quies-
cent current draw when a load is applied. This is due to
the power conversion of the Class D amplifier. For
example, an 8mV DC offset across an 8
Ω load results
in 1mA extra current consumption in a class AB device.
In the Class D case, an 8mV offset into 8
Ω equates
to an additional power drain of 8W. Due to the high
efficiency of the Class D amplifier, this represents an
additional quiescent current draw of: 8W/(VDD/100
η),
which is in the order of a few microamps.
Input Amplifier
Differential Input
The MAX9703/MAX9704 feature a differential input struc-
ture, making them compatible with many CODECs, and
offering improved noise immunity over a single-ended
input amplifier. In devices such as PCs, noisy digital sig-
nals can be picked up by the amplifier’s input traces.
The signals appear at the amplifiers’ inputs as common-
mode noise. A differential input amplifier amplifies the
difference of the two inputs, any signal common to both
inputs is canceled.
Single-Ended Input
The MAX9703/MAX9704 can be configured as single-
ended input amplifiers by capacitively coupling either
input to AGND and driving the other input (Figure 4).
Component Selection
Input Filter
An input capacitor, CIN, in conjunction with the input
impedance of the MAX9703/MAX9704, forms a high-
pass filter that removes the DC bias from an incoming
signal. The AC-coupling capacitor allows the amplifier
to bias the signal to an optimum DC level. Assuming
zero-source impedance, the -3dB point of the highpass
filter is given by:
Choose CIN so f-3dB is well below the lowest frequency
of interest. Setting f-3dB too high affects the low-fre-
quency response of the amplifier. Use capacitors with
dielectrics that 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.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100m
Ω for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability to
provide sufficient current drive. Increasing the value of
C1 improves load regulation and reduces the charge-
pump output resistance to an extent. Above 1F, the on-
resistance of the switches and the ESR of C1 and C2
dominate.
Hold Capacitor (C2)
The output capacitor value and ESR directly affect the rip-
ple at CHOLD. Increasing C2 reduces output ripple.
Likewise, decreasing the ESR of C2 reduces both ripple
and output resistance. Lower capacitance values can be
used in systems with low maximum output power levels.
Output Filter
The MAX9703/MAX9704 do not require an output filter
and can pass FCC emissions standards with unshield-
ed speaker cables. However, output filtering can be
f
RC
-3dB
IN IN
1
2
=
π
MAX9703/
MAX9704
IN+
IN-
0.47
μF
0.47
μF
SINGLE-ENDED
AUDIO INPUT
Figure 4. Single-Ended Input
Table 2. Gain Selection
G1
G2
GAIN (dB)
0
29.6
0
1
19.1
10
13
11
16
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| MAX9704EVKIT | 制造商:Maxim Integrated Products 功能描述:15W FILTERLESS SPREAD-SPECTRUM MO - Rail/Tube |
| MAX9705AEBC+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| MAX9705AETB/V+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Filterless Class D Audio Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| MAX9705AETB+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 2.3W CLS-D 10TDFN EP - Rail/Tube |
| MAX9705AETB+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
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