A2327MS8VR [AITSEMI]
MONO FILTER-FREE CLASS-D;
| 型号： | A2327MS8VR |
| 厂家： | 
AiT Semiconductor |
| 描述： | MONO FILTER-FREE CLASS-D LTE |
| 文件： | 总12页 (文件大小：486K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
DESCRIPTION
FEATURES
The A2327 is a 2.6W high efficiency filter-free class-D
audio power amplifier that requires only three
external components.
Efficiency With an 8Ω Speaker:
88% @ 400mW
80% @ 100mW
Features like 88% efficiency, −75dB PSRR, and
improved RF-rectification immunity make the A2327
ideal for cellular handsets. In cellular handsets, the
earpiece, speaker phone, and melody ringer can
each be driven by the A2327.
3.8mA Quiescent Current
0.4μA Shutdown Current
Optimized PWM Output Stage Eliminates LC
Output Filter
Internally
Generated
250kHz
Switching
Frequency Eliminates Capacitor and Resistor
Improved PSRR (−75dB) and Wide Supply
Voltage (2.5V to 5.5V) Eliminates Need for a
Voltage Regulator
The A2327 is available in MSOP8, SOP8 and
DFN8 packages.
Fully
Differential Design Reduces
RF
ORDERING INFORMATION
Rectification and Eliminates Bypass Capacitor
Improved CMRR Eliminates Two Input Coupling
Capacitors
Package Type
MSOP8
Part Number
A2327MS8R
MS8
M8
J8
Available in MSOP8, SOP8 and DFN8
Packages
A2327MS8VR
A2327M8R
A2327M8VR
A2327J8R
SOP8
DFN8
Note
APPLICATION
Mobile phone、PDA、MID
MP3/4、PMP
A2327J8VR
Portable electronic devices
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 1 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
PIN DESCRIPTION
Top View
Top View
Top View
Pin #
Symbol
SDB
NC
Function
1
2
3
4
5
6
7
8
Shutdown terminal (low active)
NC (No internal connection)
Positive differential input
Negative differential input
Positive BTL output
IN+
IN-
VO+
VDD
Power Supply
GND
VO-
Power Ground
Negative BTL output
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 2 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
ELECTRICAL CHARACTERISTICS
The following specifications apply for the circuit shown in Figure 1.
TA = 25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min.
Typ.
0.4
2.2
2.6
3.8
Max.
2
Unit
uA
Shutdown Current
ISD
VIN=0V, VSDB=0V, No Load
VDD=2.5V, VIN=0V, No Load
VDD=3.6V, VIN=0V, No Load
VDD=5.5V, VIN=0V, No Load
VIN=0V, AV=2V/V,
3.2
Quiescent Current
IQ
mA
8
Output Offset Voltage
|VOS|
2
25
mV
dB
VDD=2.5V to 5.5V
Power Supply Rejection Ratio PSRR VDD=2.5V to 5.5V
-75
VDD=2.5V to 5.5V,
Common Mode Rejection
CMRR VIC=VDD/2 to 0.5V,
Ratio
-68
dB
VIC=VDD/2 to VDD-0.8V
Modulation Frequency
Voltage Gain
FSW
AV
VDD=2.5V to 5.5V
VDD=2.5V to 5.5V
200
270k
RI
250
300k
RI
300
330k
RI
kHz
V
V
Resistance from SDB to GND
Input Impedance
RSDB
ZI
300
150
kΩ
kΩ
135
165
Wake-up Time from
Shutdown
TWU
VDD=3.6V
VDD=2.5V
32
ms
700
500
400
Drain-Source Resistance
on-state)
RDS(on) VDD=3.6V
VDD=5.5V
VSDIH
mΩ
Shutdown Voltage Input High
Shutdown Voltage Input Low
1.3
V
V
VSDIL
0.4
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 3 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
OPERATING CHARACTERISTICS
VDD=5V, RI=150kΩ, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min.
Typ.
2.60
2.10
1.60
1.30
Max.
Unit
W
THD+N=10%, f=1kHz, RL=4Ω
THD+N=1%, f=1kHz, RL=4Ω
THD+N=10%, f=1kHz, RL=8Ω
THD+N=1%, f=1kHz, RL=8Ω
Output Power
PO
Total Harmonic
THD+N Po=1.0Wrms, f=1kHz, RL=8Ω
SNR VDD=5V, Po=1.0Wrms, RL=8Ω
0.21
91
%
Distortion + Noise
Signal-to-Noise Ratio
dB
VDD=3.6V, RI=150kΩ, TA=25°C, unless otherwise specified.
Parameter
Symbol
PO
Conditions
Min.
Typ.
1.35
1.08
0.85
0.69
M ax.
Unit
W
THD+N=10%, f=1kHz, RL=4Ω
THD+N=1%, f=1kHz, RL=4Ω
THD+N=10%, f=1kHz, RL=8Ω
THD+N=1%, f=1kHz, RL=8Ω
Output Power
Total Harmonic
Distortion + Noise
Supply Ripple
THD+N PO=0.5Wrms, f=1kHz, RL=8Ω
0.21
-65
%
VDD=3.6V, input ac-grounded with
KSVR
dB
Rejection Ratio
CI=2uF, f=217Hz, V(Ripple)=200mVPP
VDD = 3.6V, input ac-
No weighting
100
75
Output Voltage Noise
Vn
grounded with CI=2uF,
f=20~20kHz
uVRMS
dB
A weighting
Common Mode
Rejection Ratio
CMRR
VDD=3.6V, VIC=1VPP, f=217Hz
-70
VDD=2.5V, RI=150kΩ, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min.
Typ.
0.60
0.51
0.40
0.33
Max.
Unit
W
THD+N=10%, f=1kHz, RL=4Ω
THD+N=1%, f=1kHz, RL=4Ω
THD+N=10%, f=1kHz, RL=8Ω
THD+N=1%, f=1kHz, RL=8Ω
Output Power
PO
Total Harmonic
THD+N Po=0.2Wrms, f=1kHz, RL=8Ω
0.21
%
Distortion + Noise
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 4 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
TEST CIRCUIT
Figure1. A2327 test set up circuit
Figure2. 30 kHz LPF for A2327 test
NOTE1: CS should be placed as close as possible to VDD/GND pad of the device
NOTE2: CI should be shorted for any Common-Mode input voltage measurement
NOTE3: A 33uH inductor should be used in series with RL for efficiency measurement
NOTE4: The 30kHz LPF (shown in figure 1) is required even if the analyzer has an internal LPF
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 5 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
BLOCK DIAGRAM
150k
RI
NOTE: Total Voltage Gain =Av1 x Av2= 2 x
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 6 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
DETAILED INFORMATION
Application Circuit
Figure 3. A2327 Application Schematic With Differential Input
Figure 4. A2327 Application Schematic With Differential Input and Input Capacitors
Figure 5. A2327 Application Schematic With Single-Ended Input
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 7 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
Component Recommended
Due to the weak noise immunity of the single-ended input application, the differential input application should
be used whenever possible. The typical component values are listed in the table:
RI
CI
CS
150k
3.3nF
2uF
(1) CI should have a tolerance of ±10% or better to reduce impedance mismatch.
(2) Use 1% tolerance resistors or better to keep the performance optimized, and place the RI close to the
device to limit noise injection on the high-impedance nodes.
Input Resistors (RI) & Capacitors (CI)
The input resistors (RI) set the total voltage gain of the amplifier according to Eq1
2 x 150kΩ V
Gain =
Eq1
RI
V
The input resistor matching directly affects the CMRR, PSRR, and the second harmonic distortion
cancellation.
If a differential signal source is used, and the signal is biased from 0.5V ~ VDD-0.8V (shown in Figure3), the
input capacitor (CI) is not required.
If the input signal is not biased within the recommended common-mode input range in differential input
application (shown in Figure4), or in a single-ended input application (shown in Figure5), the input coupling
capacitors are required.
If the input coupling capacitors are used, the RI and CI form a high-pass filter (HPF). The corner frequency (fC)
of the HPF can be calculated by Eq2
1
Hz
fC =
Eq2
2 x RI x CI
Decoupling Capacitor (CS)
A good low equivalent-series-resistance (ESR) ceramic capacitor (CS), used as power supply decoupling
capacitor (CS), is required for high power supply rejection (PSRR), high efficiency and low total harmonic
distortion (THD). CS is 2μF, placed as close as possible to the device VDD pin.
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 8 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
PACKAGE INFORMATION
Dimension in SOP8 (Unit: mm)
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 9 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
Dimension in MSOP8 (Unit: mm)
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 10 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
Dimension in DFN8 (Unit: mm)
Symbol
Min
0.70
-
Max
0.80
0.05
0.35
0.25
3.10
A
A1
b
0.25
0.18
2.90
c
D
D2
e
2.50REF
0.65BSC
1.95BSC
Nd
E
2.90
3.10
E2
L
1.55REF
0.30
0.20
0.50
0.30
h
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 11 -
A2327
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.6W MONO FILTER-FREE CLASS-D
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer. As used herein may
involve potential risks of death, personal injury, or servere property, or environmental damage. In order to
minimize risks associated with the customer's applications, the customer should provide adequate design
and operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV2.1 - NOV 2008 RELEASED, SEP 2016 UPDATED -
- 12 -
相关型号：
©2020 ICPDF网 联系我们和版权申明