没有合适的资源?快使用搜索试试~ 我知道了~
安森美的NCP4894详细资料
需积分: 10 2 下载量 102 浏览量
2010-11-11
14:01:54
上传
评论
收藏 304KB PDF 举报
温馨提示
试读
20页
NCP4894的封装、功能、外围等全部资料,欢迎大家下载
资源详情
资源评论
资源推荐
© Semiconductor Components Industries, LLC, 2007
January, 2007 − Rev. 9
1 Publication Order Number:
NCP4894/D
NCP4894
1.8 Watt Differential Audio
Power Amplifier with
Selectable Shutdown
The NCP4894 is a differential audio power amplifier designed for
portable communication device applications. This feature and the
excellent audio characteristics of the NCP4894 are a guarantee of a
high quality sound, for example, in mobile phones applications. With
a 10% THD+N value the NCP4894 is capable of delivering 1.8 W of
continuous average power to an 8.0 W load from a 5.5 V power
supply. With the same load conditions and a 5.0 V battery voltage, it
ensures 1.0 W to be delivered with less than 0.01% distortion.
The NCP4894 provides high quality audio while requiring few
external components and minimal power consumption. It features a
low−power consumption shutdown mode.
To be flexible, shutdown may be enabled by either a logic high or
low depending on the voltage applied on the SD MODE pin.
The NCP4894 contains circuitry to prevent from “pop and click”
noise that would otherwise occur during turn−on and turn−off
transitions.
For maximum flexibility, the NCP4894 provides an externally
controlled gain (with resistors), as well as an externally controlled
turn−on time (with bypass capacitor).
Due to its excellent PSRR, it can be directly connected to the
battery, saving the use of an LDO.
This device is available in 9−Pin Flip−Chip, Micro−10 and DFN10
3x3 mm packages.
Features
• Differential Amplification
• Shutdown High or Low Selectivity
• 1.0 W to an 8.0 W Load from a 5.0 V Power Supply
• Superior PSRR: Direct Connection to the Battery
• “Pop and Click” Noise Protection Circuit
• Ultra Low Current Shutdown Mode
• 2.2 V−5.5 V Operation
• External Gain Configuration Capability
• External Turn−on Configuration Capability
• Thermal Overload Protection Circuitry
• Pb−Free Packages are Available
Typical Applications
• Portable Electronic Devices
• PDAs
• Mobile Phones
9−PIN FLIP−CHIP
FC SUFFIX
CASE 499AL
http://onsemi.com
xxxx = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W, WW = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
MARKING
DIAGRAMS
Micro−10
DM SUFFIX
CASE 846B
1
8
1
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
ORDERING INFORMATION
xxxG
AYWW
A1
A3
C
1
xxxx
AYWG
G
DFN10
MN SUFFIX
CASE 485C
xxx
ALYWG
G
1
1
NCP4894
http://onsemi.com
2
Figure 1. Typical NCP4894 Application Circuit with Differential Input
−
+
VP
INM
VP
VP
RL
8W
OUTA
OUTB
VMC
BRIDGE
INP
BYPASS
20 kW
1 mF
390 nF
SHUTDOWN
CONTROL
20 kW
1 mF
Cs
SHUTDOWN CONTROL
Rf1
Ri1Ci1
Negative Diff
Input from DAC
+
−
20 kW
20 kW390 nF
Ri2Ci2
Positive Diff
Input from DAC
Rf2
VM
BYPASS
BYPASS
SD SELECT
SD MODE
0
0
1
1
0
1
0
1
Shutdown
On
On
Shutdown
SD MODE SD SELECT Status
C
b
NCP4894
http://onsemi.com
3
Figure 2. Typical NCP4894 Application Circuit for Driving Earpiece
SHUTDOWN
CONTROL
−
+
−
+
BYPASS
VP
VMC
BRIDGE
BYPASS
SHUTDOWN CONTROL
SD MODE
SD SELECT
Status
0
0
1
10
1
0
1
Shutdown
On
On
Shutdown
VP
SD SELECTSD MODE
INP
INM
OUTA
OUTB
Cb
Left Channel
Input
390nF
Ri1
VP
VM
Co1
47uF
Earpiece
Cs
Right Channel
Input
BYPASS
Co2
47uF
Ri2
Ci1
Ci2
390nF
Rf2
Rf1
20 kW
20 kW
20 kW
20 kW
1 mF
1 mF
32W
/
16W
32W
/
16W
NCP4894
http://onsemi.com
4
PIN CONNECTIONS
A3
B3
C3
A2
B2
C2
A1
B1
C1
INP BYPASS OUTB
VP SD MODE VM
INM SD SELECT OUTA
9−Pin Flip−Chip
10
9
8
6
1
2
3
5
SD SELECT
INM
SD MODE
BYPASS
OUTA
VP
NC
OUTB
Micro−10
(Top View)
(Top View)
7
4
INP VM
1
2
3
4
5
10
9
8
7
6
SD SELECT
INM
SD MODE
BYPASS
OUTA
VP
NC
OUTB
INP VM
(Top View)
DFN10
PIN DESCRIPTION
9−Pin Flip−Chip Micro−10/DFN10 Type Symbol Description
A1 4 I INP Positive Differential Input
A2 5 O BYPASS Bypass Capacitor Pin which Provides the Common Mode Voltage
A3 6 I OUTB Negative BTL Output
B1 9 I VP Positive Analog Supply of the Cell
B2 3 I SD MODE Shutdown High or Low Selectivity (Note 1)
B3 7 I VM Ground
C1 2 I INM Negative Differential Input
C2 1 O SD SELECT (Note 1)
C3 10 I OUTA Positive BTL Output
1. The SD SELECT pin must be toggled to the same state as the SD MODE pin to force the device in shutdown mode.
剩余19页未读,继续阅读
hanli770916hanli
- 粉丝: 0
- 资源: 3
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功
评论0