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參數(shù)資料
| 型號： | MAX9720BEBE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .05W STER AB 16UCSP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 系列： | DirectDrive®, SmartSense™ |
| 類型： | AB 類 |
| 輸出類型： | 耳機，2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 50mW x 2 @ 32 歐姆 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 特點： | 消除爆音，短路保護和熱保護，關閉 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 16-UCSP（2x2） |
| 封裝/外殼： | 16-WFBGA，CSPBGA |
| 包裝： | 帶卷 (TR) |
MAX9720
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100m
for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 2
lists suggested manufacturers.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the charge
pump’s load regulation and output impedance. A C1
value that is too small degrades the device’s ability to
provide sufficient current drive, which leads to a loss of
output voltage. In most applications, 1F for both C1
and C2 provides adequate performance. Increasing
the value of C1 improves load regulation and reduces
the charge-pump output resistance to an extent. See
the Output Power vs. Charge Pump Capacitance and
Load Resistance graph in the Typical Operating
Characteristics. Above 2.2F, the on-resistance of the
switches and the ESR of C1 and C2 dominate.
Hold Capacitor (C2)
The hold capacitor value and ESR directly affect the
ripple on PVSS. Increasing the value of C2 reduces out-
put ripple. Likewise, decreasing the ESR of C2 reduces
both ripple and output impedance. Lower capacitance
values can be used in systems with low maximum out-
put power levels. See the Output Power vs. Charge-
Pump Capacitance and Load Resistance graph in the
Typical Operating Characteristics.
Power-Supply Bypass Capacitor
The power-supply bypass capacitor (C3) lowers the
output impedance of the power supply and reduces the
impact of the MAX9720’s charge-pump switching tran-
sients. Bypass VDD with C3, the same value as C1, and
place it physically close to the device.
TIME Capacitor
The TIME capacitor (CTIME) sets the HPS debounce
time. The debounce time is the delay between HPS
exceeding 0.8 x VDD and the execution of the
SmartSense routine. The delay ensures that any exces-
sive contact bounce caused by the insertion of a head-
phone plug into the jack does not cause HPS to
register an invalid state (Figure 9). The value of the
CTIME in nF equals the nominal delay time in ms, i.e.,
CTIME = 10nF = tDELAY = 10ms. CTIME values in the
200nF to 600nF range are recommended.
Adding Volume Control
The addition of a digital potentiometer provides simple,
digital volume control. Figure 10 shows the MAX9720
with the MAX5408 dual log taper digital potentiometer
used as an input attenuator. Connect the high terminal
of the MAX5408 to the audio input, the low terminal to
GND, and the wiper to CIN. Setting the wiper to the top
position passes the audio signal unattenuated. Setting
the wiper to the lowest position fully attenuates the input.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Connect PGND and SGND together at a
single point on the PC board. Connect all components
associated with the charge pump (C2 and C3) to the
PGND plane. Connect PVSS and SVSS together at the
device. Bypassing of both the positive and negative
supplies is accomplished by the charge-pump capaci-
tors, C2 and C3 (see Typical Application Circuit). Place
capacitors C1 and C3 as close to the device as possi-
ble. Place capacitor C2 as close to PVSS as possible.
Route PGND and all traces that carry switching tran-
sients away from SGND, traces, and components in the
audio signal path.
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
16
______________________________________________________________________________________
SUPPLIER
PHONE
FAX
WEBSITE
Taiyo Yuden
800-348-2498
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
Table 2. Suggested Capacitor Manufacturers
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9720BEUE | 制造商:Maxim Integrated Products 功能描述:50MW, DIRECTDRIVE, STEREO HEADPHONE AMPLIFIER - Rail/Tube |
| MAX9721AEBC | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AEBC-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AETC | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AETC+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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