AAP6204 [ETC]
1.36-W Mono Fully Differential Audio Power Amp; 1.36 -W单声道全差分音频功率放大器
| 型号： | AAP6204 |
| 厂家： | 
ETC |
| 描述： | 1.36-W Mono Fully Differential Audio Power Amp |
| 文件： | 总11页 (文件大小：662K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
芯美 子
AAP6204
1.36-W Mono Fully Differential
Audio Power Amplifier
FEATURES
DESCRIPTION
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Supply Voltage 2.5V to 5.5V
The AAP6204 is a mono fully-differential audio
amplifier, capable of delivering 1.36W of continuous
average power to an 8Ω BTL load with less than 1%
distortion (THD+N) from a 5V power supply, and
720mW to a 8Ω load from a 3.6V power supply.
The AAP6204 is ideal for PDA/smart phone application
due to features such as -80-dB supply voltage rejection
from 70Hz to 2kHz, improved RF rectification immunity,
small 20mm2 PCB area, and a fast startup with minimal
pop.
1.36W into 8Ω from a 5-V Supply at THD=1% (typ)
Low Supply Current: 4mA typ at 5V
Shutdown Current: 0.01µA typ
Fast Startup with Minimal Pop
Only Three External Components
- Improved PSRR (-80dB) for Direct Battery Operation
- Full Differential Design Reduces RF Rectification
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- -63dB CMRR Eliminates Two Input Coupling
The AAP6204 is available in the space-saving 3mm ×
3mm TDFN package.
Capacitors
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RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
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Wireless Handsets
PDAs
Portable Devices
Typical Application Circuit
Figure 1.
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AAP6204
Block Diagram
Figure 2.
Pin Configurations
Package
Pin Configurations
TDFN-8
Pin Description
SYMBOL
PIN
1
2
3
4
DESCRIPTION
Shutdown terminal
Shutdown
Bypass
IN+
IN-
VO+
Mid-supply voltage, adding a bypass capacitor improves PSRR
Positive differential input
Negative differential input
Positive BTL output
5
VDD
GND
VO-
6
7
8
Power supply
High-current ground
Negative BTL output
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Ordering Information
AAP6204
Order Number
Package Type
Marking
Operating Temperature Range
xxxxx
6204
AAP6204JIR1
TDFN-8
-40°C to 85°C
AAP6204 □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
J: TDFN
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Absolute Maximum Ratings
AAP6204
▓
▓
▓
▓
▓
▓
Supply voltage, VDD ----------------------------------------------------------------------------------- -0.3 V to 6V
Input voltage, VI ---------------------------------------------------------------------------- -0.3 V to VDD +0.3V
Storage temperature rang, Tstg ------------------------------------------------------------------- -65°C to 150°C
ESD Susceptibility -------------------------------------------------------------------------------------------- 2kV
Junction Temperature -------------------------------------------------------------------------------------- 150°C
Thermal Resistance
θJA (TDFN) ---------------------------------------------------------------------------------------------- 50°C/W
Recommended Operating Conditions
MIN NOM MAX UNIT
Supply Voltage, VDD
2.5
5.5
V
V
High-level input voltage, VIH
Low-level input voltage, VIL
Operating free-air temperature, TA
1.55
0.5
85
V
-40
°C
Electrical Characteristics, TA=25°C
AAP6204
Min Typ Max.
Symbol
Parameter
Conditions
Unit
Output offset voltage
VOS
VI=0V differential, Gain=1V/V, VDD=5.5V
-9
0.8
-87
9
mV
(measured differentially)
PSRR Power supply rejection ratio
VIC Common mode input range
VDD=2.5V to 5.5V
VDD=2.5V to 5.5V
-60
dB
V
0.5
VDD-0.8
VDD=2.5V, VIC=0.5V to 1.7V
VDD=5.5V, VIC=0.5V to 4.7V
-63
-63
-40
-40
Common mode rejection
CMRR
range
dB
VDD=5.5V
VDD=3.6V
0.45
0.37
0.26
4.95
3.18
2.13
RL=8Ω,
Gain=1V/V
Low-output swing
VIN+=VDD
,
V -=0V or
V
IN
VIN+=0V,
V -=VDD
IN
VDD=2.5V
0.4
VDD=5.5V
VDD=3.6V
VDD=2.5V
RL=8Ω,
Gain=1V/V
VIN-=0V or
, VIN+=0V
High-output swing
VIN+=VDD
,
V
VIN-=VDD
2
High-level input current,
Shutdown
Low-level input current,
Shutdown
|IIH|
VDD=5.5V, VI=5.8V
DD=5.5V, VI= -0.3V
58
100
100
µA
|IIL|
V
3
4
µA
mA
µA
IQ
Quiescent current
VDD=2.5V to 5.5V, with load
V( Shutdown )≤0.5V, VDD=2.5V to 5.5V,
RL= 8Ω
I(SD) Supply current
0.01
1
38kΩ 40kΩ 42kΩ
Gain
RL= 8Ω
V/V
RI
RI
RI
Resistance from shutdown to
100
kΩ
GND
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Operating Characteristics, TA=25°C, Gain=1V/V
AAP6204
AAP6204
Symbol
Parameter
Conditions
Unit
Min Typ Max.
VDD=5V
1.36
0.72
0.33
1.7
0.85
0.4
0.04
0.04
0.05
THD+N=1%, f=1kHz,RL=8Ω
W
VDD=3.6V
VDD=2.5V
VDD=5V
VDD=3.6V
VDD=2.5V
PO
Output power
THD+N=10%, f=1kHz,RL=8Ω
W
%
VDD=5V, PO=1W, RL=8Ω, f=1kHz
VDD=3.6V, PO=0.5W, RL=8Ω, f=1kHz
DD=2.5V, PO=200mW, RL=8Ω, f=1kHz
Total harmonic distortion
plus noise
THD+N
KSVR
V
VDD=3.6V,
f = 217Hz
-86
Supply ripple rejection
ratio
Inputs ac-grounded
with Ci=2µF,
dB
dB
f=70Hz
to 2kHz
-80
V(Ripple)=200mVpp
SNR Signal-to-noise ratio
VDD=5V, PO=1W, RL=8Ω
105
No
V
DD=3.6V, f=20Hz to 20kHz,
11.7
A
Vn
Output voltage noise
Inputs ac-grounded with
Ci=2µF
µVRMS
8.7
-60
Common mode rejection VDD=3.6V
CMRR
RF
f=217Hz
dB
ratio
VIC=1Vpp
Feedback resistance
38
40
23
44
kΩ
Start-up time from
shutdown
VDD=3.6V, CBYPASS=0.1µF
ms
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Typical Operating Characteristics
AAP6204
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
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Typical Operating Characteristics (continued)
AAP6204
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
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Typical Operating Characteristics (continued)
AAP6204
Figure 15.
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Application Information
Application Schematics
Figure16 through Figure17 show application schematics
for differential and single-ended inputs. Typical values
are shown in Table1.
AAP6204
Power Dissipation
Power dissipation is a major concern when designing a
successful amplifier, whether the amplifier is bridged or
single-ended. A direct consequence of the increased
power delivered to the load by a bridge amplifier is an
increase in internal power dissipation. Since the AAP6204
has two operational amplifiers in one package, the
maximum internal power dissipation is 4 times that of a
single-ended amplifier. The maximum power dissipation
for a given application can be derived from the power
dissipation graphs of from equation1.
Table1. Typical Component Value
Component
Value
40kΩ
0.22µF
1µF
RI
C(BYPASS)
CS
P
= 4*(V )2 /(2π2R )
------------(1)
DD L
DMAX
CI
0.22µF
It is critical that the maximum junction temperature TJMAX
of 150°C is not exceeded. TJMAX can be determine from
the power derating curves by using PDMAX and the PC
board foil area. By adding additional copper foil, the
thermal resistance of the application can be reduced,
resulting in higher PDMAX. Additional copper foil can be
added to any of the leads connected to the AAP6204. If
TJMAX still exceeds 150°C, then additional changes must
be made. These changes can include reduced supply
voltage, higher load impedance, or reduced ambient
temperature. Internal power dissipation is a function of
output power.
Proper Selection of External Components
Gain-Setting Resistor Selection
The input resistor (RI) can be selected to set the gain of
the amplifier according to equation2.
Gain=RF/RI
(2)
The internal feedback resistors (RF) are trimmed to 40kΩ.
Resistor matching is very important in fully differential
amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors. CMRR,
PSRR, and the cancellation of the second harmonic
distortion diminishes if resistor mismatch occurs.
Therefore, it is recommended to use 1% tolerance
resistors or better to keep the performance optimized.
Bypass Capacitor (CBYPASS) and Start-up Time
The internal voltage divider at the Bypass pin of this
device sets a mid-supply voltage for internal references
and sets the output common mode voltage to VDD/2.
Adding a capacitor to this pin filters any noise into this
pin and increases kSVR. C(BYPASS) also determines the rise
time of VO+ and VO- when the device is taken out of
shutdown. The larger the capacitor, the slower the rise
time. Show the relationship of C(BYPASS) to start-up time as
Figure10.
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AAP6204
Input Capacitor (CI)
In this example, CI is 0.16µF, so one would likely
The AAP6204 does not require input coupling capacitors
if using a differential input source that is biased from
0.5V to VDD -0.8V. Use 1% tolerance or better
gain-setting resistors if not using input coupling
capacitors.
choose a value in the range of 0.22µF to 0.47µF.
Ceramic capacitors should be used when possible, as
they are the best choice in preventing leakage current.
When polarized capacitors are used, the positive side of
the capacitor should face the amplifier input in most
applications, as the dc level there is held at VDD/2, which
is likely higher than the source dc level. It is important to
confirm the capacitor polarity in the application.
In the single-ended input application an input capacitor,
CI, is required to allow the amplifier to bias the input
signal to the proper dc level. In this case, CI and RI form
a high-pass filter with the corner frequency determined
in equation3.
1
Decoupling Capacitor (CS)
f
=
(3)
The AAP6204 is a high-performance CMOS audio
amplifier that requires adequate power supply
decoupling to ensure the output total harmonic distortion
(THD) is as low as possible. Power supply decoupling
also prevents oscillations for long lead lengths between
the amplifier and the speaker. For higher frequency
transients, spikes, or digital hash on the line, a good low
equivalent-series-resistance (ESR) ceramic capacitor,
typically 0.1µF to 1 µF, placed as close as possible to the
device VDD lead works best. For filtering lower
frequency noise signals, a 10-µF or greater capacitor
placed near the audio power amplifier also helps, but is
not required in most applications because of the high
PSRR of this device.
C
2π R C
I I
The value of CI is important to consider as it directly
affects the bass (low frequency) performance of the
circuit.
Consider the example where RI is 10kΩ and the
specification calls for a flat bass response down to
100Hz. Equation 3 is reconfigured as equation4.
1
C =
(4)
I
2π R f
I C
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Package Information
AAP6204
TDFN-8
DETAIL A
MILLIMETERS
INCHES
0.090
SYMBOLS
MIN.
0.70
0.00
0.20
2.90
MAX.
MIN.
0.028
0.000
0.008
0.114
MAX.
A
A1
b
D
D1
0.80
0.05
0.40
3.10
0.031
0.002
0.016
0.122
2.30
E
E1
e
2.90
0.25
3.10
0.45
0.114
0.010
0.122
0.018
1.50
0.65
0.059
0.026
L
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