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參數資料
| 型號： | MAX98307EVKIT# |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 5/21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 13
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Detailed Description
The MAX98307/MAX98308 fully differential mono Class
DG multilevel power amplifiers with integrated inverting
charge pumps offer highly efficient, high-power audio
solutions for portable applications.
The new Class DG multilevel modulation scheme extends
the dynamic range of the output signal by employing a
charge-pump-generated negative rail, which is used as
needed to extend the supply range. When the negative
rail is not needed, the output is drawn entirely from the
standard supply. This scheme results in high efficiency
over a wide output power range.
The power amplifier incorporates active emissions limit-
ing edge rate and overshoot control circuitry in combi-
nation with the multilevel output modulation scheme to
greatly reduce EMI. These features eliminate the need for
output filtering as compared to traditional Class D ampli-
fiers, which reduces an application’s component count.
The MAX98307 has an adjustable gain set by external
resistors. The MAX98308 has preset fixed gains of 8.5dB,
11.5dB, 14.5dB, 17.5dB, and 20.5dB set by a gain select
input (GAIN).
Class DG Multilevel Operation
The ICs’ filterless Class DG multilevel amplifiers feature
a proprietary Maxim output stage that offers higher effi-
ciency over a greater output power range than previous
amplifiers. The amplifier combines Class D switching
output efficiency and Class G supply level shifting with a
multilevel output modulation scheme that with a 5V supply
has efficiency better than 80% efficiency over the 0.35W
to 2.2W output range.
The Class DG multilevel output stage uses pulse-width
modulation (PWM), a rail-to-rail digital output signal with
variable duty cycle, to approximate an analog input signal
as in a Class D amplifier. Rail-to-rail operation ensures that
any dissipation at the output is due solely to the RDS(ON)
of the power output MOSFETs. The Class DG multilevel
output stage also senses the magnitude of the output
signal and switches the supply rails as needed to more
efficiently supply the required signal power. For a low out-
put signal swing requirement (below the battery supply rail
VPVDD), the output range is between VPVDD and ground.
When output swing above VPVDD is required, VPVSS, an
internal inverting charge-pump-generated negative rail
replaces ground as the lower supply. The high output
swing range is then VPVDD to VPVSS, approximately dou-
ble the low swing range. This approach efficiently man-
ages power consumption by switching the operating rails
as needed according to the output swing requirements.
Additionally, multilevel output modulation is employed in to
draw the maximum possible power from the lower imped-
ance battery supply rail, VPVDD, rather than the higher
impedance charge-pump-generated rail VPVSS. This is
accomplished by generating PWM signals that swing
from ground to VPVDD or from ground to VPVSS at either
end of the bridge tied load (BTL) rather than continually
swinging from VPVDD to VPVSS. The signals are modu-
lated in such a way that VPVSS is used only as necessary
to generate low-end signal swing.
These combined operations ensure that power dissipa-
tion due to RDS(ON) loss and charge-pump impedance
is minimized, and that efficiency and output power is
maximized across the audio range. Class DG multilevel
operation is shown as Figure 1.
Figure 1. Class DG Multilevel Operation
MAX98307 fig01
400s/div
OUT+
5V/div
OUT-
5V/div
OUT+ - OUT-
10V/div
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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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