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參數資料
| 型號： | MAX9773ETG+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 7/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 1.8W D 24TQFN |
| 標準包裝： | 75 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數量： | 1.8W x 2 @ 4 歐姆 |
| 電源電壓： | 2.6 V ~ 5.5 V |
| 特點： | 消除爆音，差分輸入，短路和熱保護，關閉 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 24-TQFN-EP（4x4） |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
The internal input resistance, RIN, changes with each
gain setting. The R1 resistors attenuate the gain and
resistors R2 compensate for RIN’s tolerance, which can
be as high as 25%. CIN must be adjusted to compen-
sate for the total change in input impedance or the low-
frequency roll-off point shifts.
Input Amplifier
Differential Input
The MAX9773 features a differential input structure,
making it compatible with many CODECs and offers
improved noise immunity over a single-ended input
amplifier. In devices such as cellular phones, high-fre-
quency signals from the RF transmitter can be picked
up by the amplifier’s input traces. The signals appear at
the amplifier’s inputs as common-mode noise. A differ-
ential input amplifier amplifies the difference of the two
inputs, any signal common to both inputs is canceled.
Single-Ended Input
The MAX9773 can be configured as a single-ended
input amplifier by capacitively coupling either input to
GND, and driving the other input (Figure 7).
Component Selection
Input Filter
An input capacitor, CIN, in conjunction with the
MAX9773 input impedance (RIN) forms a highpass filter
that removes the DC bias from an incoming signal. The
AC-coupling capacitor allows the amplifier to automati-
cally 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. Use capacitors 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
cellular phones and two-way radios need only concen-
trate 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 300Hz. Taking these two factors into considera-
tion, 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.
f
RC
dB
IN IN
=
3
1
2
π
MAX9773
1.8W, Filterless, Ultra-Low EMI,
Stereo Class D Audio Power Amplifier
______________________________________________________________________________________
15
MAX9773
0.1
F
10
F
2.5V TO 5.5V
0.47
F
0.47
F
0.47
F
0.47
F
SINGLE-ENDED
LEFT AUDIO INPUT
SINGLE-ENDED
RIGHT AUDIO INPUT
OUTL+
OUTL-
OUTR+
OUTR-
GAIN1
GND
PGND
SYNC
INL+
INR+
INL-
INR-
GAIN2
SHDN
VDD
PVDD
FFM MODE WITH fOSC = 1100kHz, GAIN = 15.6dB.
Figure 7. Single-Ended Input
MAX9773
INL+
INL-
R1
R2
CIN
R1
RIN
INR+
INR-
R1
R2
CIN
R1
RIN
Figure 6. Custom Gain Setting
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9773ETG+ | 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9773ETG+T | 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9773EWP+G45 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9773EWP+TG45 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9775EBX+G45 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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