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參數(shù)資料
| 型號： | NCP4894FCT1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.8 Watt Differential Audio Power Amplifier with Selectable Shutdown |
| 中文描述： | 1.08 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | FLIP CHIP, CSP-9 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 174K |
| 代理商： | NCP4894FCT1 |
NCP4894
http://onsemi.com
12
GainSetting Resistor Selection (R
in
and R
f
)
R
in
and R
f
set the closedloop gain of both amplifiers.
In order to optimize device and system performance, the
NCP4894 should be used in low gain configurations.
The low gain configuration minimizes THD + noise
values and maximizes the signal to noise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
A closed loop gain in the range from 2 to 5 is
recommended to optimize overall system performance.
An input resistor (R
in
) value of 22 k is realistic in most
applications, and doesn’t require the use of a very large
capacitor C
in
.
Input Capacitor Selection (C
in
)
The input coupling capacitor blocks the DC voltage at
the amplifier input terminal. This capacitor creates a
highpass filter with Rin, the cutoff frequency is given by
1
2 *
*Rin* Cin
fc
.
The size of the capacitor must be large enough to couple
in low frequencies without severe attenuation. However a
large input coupling capacitor requires more time to reach
its quiescent DC voltage (VP/2) and can increase the
turnon pops.
An input capacitor value between 0.1 and 0.39 F
performs well in many applications (With R
in
= 22 k ).
Bypass Capacitor Selection (Cby)
The bypass capacitor Cby provides halfsupply filtering
and determines how fast the NCP4894 turns on.
This capacitor is a critical component to minimize the
turnon pop. A 1.0
F bypass capacitor value
(C
in
= < 0.39 F) should produce clickless and popless
shutdown transitions. The amplifier is still functional with
a 0.1 F capacitor value but is more susceptible to “pop and
click” noises.
Thus, a 1.0 F bypassing capacitor is recommended.
Figure 30. Demonstration Board Schematic
+
VP
INM
VP
VP
RL
8
OUTA
OUTB
VMC
BRIDGE
INP
BYPASS
20 k
1 F
1 F
SHUTDOWN
CONTROL
20 k
1 F
C4
R4
R2
C2
+
20 k
20 k
R1
C1
R5
VM
BYPASS
BYPASS
SD SELECT
SD MODE
C3
1 F
VP
J4
J5
R3
100 k
J10
J1
VP
GND
J2
J3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP4894FCT1G | 功能描述:音頻放大器 1.8W Diff Audio PWR Industrial Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型: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 |
| NCP4894MNR2 | 功能描述:音頻放大器 1.8W Diff Audio PWR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型: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 |
| NCP4894MNR2G | 功能描述:音頻放大器 1.8W Diff Audio PWR Industrial Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型: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 |
| NCP4896 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.0 Watt Audio Power Amplifier with Earpiece Driving Capability |
| NCP4896/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1W Audio Amplifier with Earpiece Driving Capability |
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