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參數資料
| 型號： | MAX98307EVKIT# |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 7/21頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX98307 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 放大器類型： | DG 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數量： | 3.3W x 1 @ 8 歐姆 |
| 電源電壓： | 2.6 V ~ 5.25 V |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX98307 |
| 已供物品： | 板 |
Maxim Integrated Products 15
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Click-and-Pop Suppression
The speaker amplifier features Maxim’s comprehensive
click-and-pop suppression. During startup, the click-
and-pop suppression circuitry reduces any audible
transient sources internal to the device. When entering
shutdown, the differential speaker outputs quickly and
simultaneously ramp down to PGND.
Thermal and Short Circuit Protection
The ICs automatically enter thermal shutdown when the
die temperature is greater than +160NC and reactivate at
less than +135NC. Additionally, if the outputs are shorted
to each other or either rail, the amplifier prevents cata-
strophic loss by disabling the outputs.
Shutdown
The ICs feature a low-power shutdown mode, drawing
less than 0.225FA (typ) supply current. Drive SHDN low
to put the IC into the shutdown state.
Applications Information
Filterless Class DG Operation
Traditional Class DG amplifiers require an output filter.
The filter adds cost and size, as well as decreases effi-
ciency and THD+N performance. The ICs’ active emis-
sions limiting and Class DG multilevel output modulation
allow for filterless operation while reducing external com-
ponent count, and thereby, cost.
Because the switching frequency of the ICs is well
beyond the bandwidth of most speakers, voice coil
movement due to the switching frequency is very small.
Use a speaker with a series inductance > 10FH. Typical
8I speakers exhibit series inductances in the 20FH to
100FH range.
Differential Input Amplifier
The ICs feature a differential input configuration, making
the device compatible with many codecs and offering
improved noise immunity as compared to single-ended
input amplifiers. In devices such as mobile phones, noisy
digital signals can be picked up by an amplifier’s input
traces. A differential amplifier amplifies the difference
of the two inputs, while signals common to both inputs,
such as switching noise, are rejected. While both ICs
feature differential amplifiers, their voltage gain is set in
differing manners.
The MAX98307 employs external feedback resistors as
shown in Figure 4. Voltage gain of the input amplifier is
set as:
( )
FB
V
IN
R
A
20log
dB
8.5dB
R
=
+
where AV is the desired voltage gain in decibels. RIN+
should be equal to RIN-, and RFB+ should be equal to RFB-.
In differential input configurations, the common-mode
rejection ratio (CMRR) is primarily limited by the external
resistor and capacitor matching. Ideally, to achieve the
highest possible CMRR, the following external compo-
nents should be selected where:
FB
FB-
IN
IN-
IN
IN-
RR
and
CC
+
=
The gain of the MAX98308 is selectable by connecting
the gain-select bump GAIN as described in Table 1.
Figure 4. Setting the Voltage Gain of the MAX98307
CLASS DG
OUTPUT
STAGE
FB+
IN+
IN-
FB-
RFB-
RFB+
RIN+
RIN-
MAX98307
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX98307EVKIT# | 功能描述:音頻 IC 開發工具 MAX98307 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX98308EWC+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX98308EWC+T | 制造商:Maxim Integrated Products 功能描述:AMPLIFIER - Tape and Reel |
| MAX98309EVKIT# | 功能描述:音頻 IC 開發工具 MAX98309 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX98309EWL+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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