參數(shù)資料
型號(hào)： MAX9776EVKIT+
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 16/38頁(yè)
文件大?。?/td> 0K
描述： EVALUATION KIT FOR MAX9776
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
系列： DirectDrive®
放大器類(lèi)型： D 類(lèi)
輸出類(lèi)型： 1-通道（單聲道），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： 1.5W x 1 @ 4 歐姆; 60mW x 2 @ 16 歐姆
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
板類(lèi)型： 完全填充
已用 IC / 零件： MAX9776
已供物品： 板，CD
相關(guān)產(chǎn)品： MAX9776EBX+TG45-ND - IC AMP AUDIO PWR 1.5W MONO 36WLP
MAX9776ETJ+T-ND - IC AMP AUDIO PWR 1.5W D 32TQFN
MAX9776ETJ+-ND - IC AMP AUDIO PWR 1.5W D 32TQFN
Charge Pump
The MAX9775/MAX9776 feature a low-noise charge
pump. The switching frequency of the charge pump is
half the switching frequency of the Class D amplifier,
regardless of the operating mode. The nominal switch-
ing frequency is well beyond the audio range, and thus
does not interfere with the audio signals, resulting in an
SNR of 93dB. Although not typically required, addition-
al high-frequency noise attenuation can be achieved by
increasing the size of C2 (see the
Typical Application
Circuits). The charge pump is active in both speaker
and headphone modes.
3D Enhancement
The MAX9775 features a 3D stereo enhancement func-
tion, allowing the MAX9775 to widen the stereo sound field
and immerse the listener in a cleaner, richer sound experi-
ence. Note the MAX9776, mono Class D speaker amplifier
does not feature 3D stereo enhancement.
As stereo speaker applications become more compact,
the quality of stereophonic sound is jeopardized.
With Maxim’s 3D stereo enhancement, it is possible to
emulate stereo sound in situations where the speakers
must be positioned close together. As shown in Figure
6, wave interference can be used to cancel the left
channel in the vicinity of the listener’s right ear and vice
versa. This technique can yield an apparent separation
between the speakers that is a factor of four or greater
than the actual physical separation.
The external capacitors CL_L, CL_H, CR_L, and CR_H
set the starting and stopping range of the 3D effect.
CL_H and CR_H are for the lower limit (in the MAX9775
Typical Application Circuit, it is 1kHz), CR_L and CL_L
are for the higher limit (10kHz). The internal resistor is
typically 7k
Ω and the frequencies are calculated as:
where R = 7k
Ω and C = CR_H and CL_H.
where R = 7k
Ω and C = CR_L and CL_L.
For example, with CR_L = CL_L = 2.2nF and CR_H =
CL_H = 22nF, the 3D start frequency is 1kHz and the
3D stop frequency is 10kHz.
Enabling the 3D sound effect results in an apparent 6dB
gain because the internal left and right signals are mixed
together. This gain can be nulled by volume adjusting
the left and right signals. The volume control can be pro-
grammed through the I2C-compatible interface to com-
pensate for the extra 6dB increase in gain. For example,
3
1
2
D STOP
RC
_
=
π
3
1
2
D START
RC
_
=
π
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
______________________________________________________________________________________
23
VDD / 2
VDD
GND
+VDD
-VDD
GND
VOUT
CONVENTIONAL DRIVER-BIASING SCHEME
DirectDrive BIASING SCHEME
Figure 5. Traditional Amplifier Output vs. MAX9775/MAX9776
DirectDrive Output
+
d
QR
IL
IR
QL
RIGHT
LEFT
RIGHT
LEFT
LISTENER
Figure 6. MAX9775 3D Stereo Enhancement
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9776EVKIT+ 功能描述:音頻 IC 開(kāi)發(fā)工具 MAX9776 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
MAX9777ETI+ 功能描述:音頻放大器 Integrated Circuits (ICs) 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
MAX9777ETI+T 功能描述:音頻放大器 Integrated Circuits (ICs) 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
MAX9778ETI+ 功能描述:音頻放大器 Integrated Circuits (ICs) 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
MAX9778ETI+T 功能描述:音頻放大器 Integrated Circuits (ICs) 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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