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參數(shù)資料
| 型號(hào)： | MAX9779ETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/19頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 2.6W AB 28TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類(lèi)型： | AB 類(lèi) |
| 輸出類(lèi)型： | 2-通道（立體聲）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： | 2.6W x 2 @ 3 歐姆; 110mW x 2 @ 16 歐姆 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉 |
| 安裝類(lèi)型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 封裝/外殼： | 28-WFQFN 裸露焊盤(pán) |
| 包裝： | 帶卷 (TR) |
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MAX9779
2.6W Stereo Audio Power Amplifier and
DirectDrive Headphone Amplifier
12
______________________________________________________________________________________
Headphone Sense Input (HPS)
The headphone sense input (HPS) monitors the head-
phone jack and automatically configures the device
based upon the voltage applied at HPS. A voltage of
less than 0.8V sets the device to speaker mode. A volt-
age of greater than 2V disables the bridge amplifiers
and enables the headphone amplifiers.
For automatic headphone detection, connect HPS to the
control pin of a 3-wire headphone jack as shown in
Figure 5. With no headphone present, the output imped-
ance of the headphone amplifier pulls HPS low. When a
headphone plug is inserted into the jack, the control pin
is disconnected from the tip contact and HPS is pulled
to VDD through a 10A current source.
BIAS
The MAX9779 features an internally generated, power-
supply independent, common-mode bias voltage of
1.8V referenced to GND. BIAS provides both click-and-
pop suppression and sets the DC bias level for the
amplifiers. Choose the value of the bypass capacitor as
described in the BIAS Capacitor section. No external load
should be applied to BIAS. Any load lowers the BIAS volt-
age, affecting the overall performance of the device.
Gain Selection
The MAX9779 features an internally set, selectable gain.
The GAIN1 and GAIN2 inputs set the maximum gain
of the MAX9779 speaker and headphone amplifiers
(Table 1).
Shutdown
The MAX9779 features a 0.2A, low-power shutdown
mode that reduces quiescent current consumption and
extends battery life. Driving SHDN low disables the
drive amplifiers, bias circuitry, and charge pump, and
drives BIAS and all outputs to GND. Connect SHDN to
VDD for normal operation.
Click-and-Pop Suppression
Speaker Amplifier
The MAX9779 speaker amplifiers feature Maxim’s com-
prehensive, industry-leading click-and-pop suppres-
sion. During startup, the click-pop suppression circuitry
eliminates any audible transient sources internal to the
device. When entering shutdown, both amplifier out-
puts ramp to GND quickly and simultaneously.
ADDITIONAL THD+N DUE
TO DC-BLOCKING CAPACITORS
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.001
0.01
0.1
1
10
0.0001
10
100k
TANTALUM
ALUM/ELEC
Figure 4. Distortion Contributed by DC-Blocking Capacitors
MAX9779
10
A
1k
1k
20
14
13
VDD
HPS
HPOUTL
HPOUTR
SHUTDOWN
CONTROL
Figure 5. HPS Configuration
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