ETC AAP6204

芯美电子
AAP6204
1.36-W Mono Fully Differential
Audio Power Amplifier
FEATURES
DESCRIPTION
z
z
z
z
z
z
Supply Voltage 2.5V to 5.5V
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
- -63dB CMRR Eliminates Two Input Coupling
Capacitors
z RoHS Compliant and 100% Lead (Pb)-Free
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.
The AAP6204 is available in the space-saving 3mm ×
3mm TDFN package.
APPLICATIONS
z Wireless Handsets
z PDAs
z Portable Devices
Typical Application Circuit
Figure 1.
DS6204
Ver0.1
July 2008
1
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Block Diagram
Figure 2.
Pin Configurations
Package
Pin
Configurations
TDFN-8
Pin Description
DS6204
SYMBOL
PIN
Shutdown
Bypass
IN+
INVO+
VDD
GND
VO-
1
Shutdown terminal
2
3
4
5
6
7
8
Mid-supply voltage, adding a bypass capacitor improves PSRR
Positive differential input
Negative differential input
Positive BTL output
Power supply
High-current ground
Negative BTL output
Ver0.1
July 2008
DESCRIPTION
2
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Ordering Information
Order Number
Package Type
Marking
Operating Temperature Range
AAP6204JIR1
TDFN-8
xxxxx
6204
-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
DS6204
Ver0.1
July 2008
3
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Absolute Maximum Ratings
▓
▓
▓
▓
▓
▓
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
2.5
5.5
V
1.55
V
0.5
V
-40
85
°C
Supply Voltage, VDD
High-level input voltage, VIH
Low-level input voltage, VIL
Operating free-air temperature, TA
Electrical Characteristics, TA=25°C
Symbol
VOS
Parameter
Conditions
Output offset voltage
(measured differentially)
PSRR Power supply rejection ratio
VIC
CMRR
VDD=2.5V to 5.5V
Common mode rejection
range
VDD=2.5V, VIC=0.5V to 1.7V
VDD=5.5V, VIC=0.5V to 4.7V
RL=8Ω,
Gain=1V/V VDD=5.5V
VIN-=0V or VDD=3.6V
VIN+=VDD,
VIN-=VDD VDD=2.5V
VIN+=0V,
RL=8Ω,
Gain=1V/V VDD=5.5V
VIN+=VDD, VIN-=0V or VDD=3.6V
VIN-=VDD, VIN+=0V
VDD=2.5V
High-output swing
High-level input current,
Shutdown
Low-level input current,
|IIL|
Shutdown
IQ
I(SD)
9
mV
-87
-60
dB
VDD-0.8
V
-63
-63
0.45
0.37
0.26
4.95
3.18
2.13
-40
-40
dB
0.5
2
V
0.4
V
58
100
µA
VDD=5.5V,
VI= -0.3V
3
100
µA
VDD=2.5V to 5.5V, with load
Supply current
V( Shutdown )≤0.5V, VDD=2.5V to 5.5V,
RL= 8Ω
Gain
RL= 8Ω
July 2008
0.8
VI=5.8V
Quiescent current
Ver0.1
AAP6204
Unit
Typ Max.
VDD=5.5V,
4
38kΩ
RI
Resistance from shutdown to
GND
DS6204
-9
VDD=2.5V to 5.5V
Common mode input range
Low-output swing
|IIH|
VI=0V differential, Gain=1V/V, VDD=5.5V
Min
mA
0.01
1
µA
40kΩ
RI
42kΩ
RI
V/V
100
4
联系电话：１５９９９６４４５７９　８３１５１７１５
kΩ
芯美电子
AAP6204
Operating Characteristics, TA=25°C, Gain=1V/V
Symbol
PO
Parameter
Output power
THD+N
Total harmonic distortion
plus noise
KSVR
Supply ripple rejection
ratio
SNR
Signal-to-noise ratio
Vn
Output voltage noise
CMRR
RF
Common mode rejection
ratio
Ver0.1
July 2008
AAP6204
Unit
Min Typ Max.
VDD=5V
THD+N=1%, f=1kHz,RL=8Ω VDD=3.6V
VDD=2.5V
VDD=5V
THD+N=10%, f=1kHz,RL=8Ω VDD=3.6V
VDD=2.5V
VDD=5V, PO=1W, RL=8Ω, f=1kHz
1.36
0.72
0.33
1.7
0.85
0.4
0.04
VDD=3.6V, PO=0.5W, RL=8Ω, f=1kHz
0.04
VDD=2.5V, PO=200mW, RL=8Ω, f=1kHz
VDD=3.6V,
f = 217Hz
Inputs ac-grounded
f=70Hz
with Ci=2µF,
to 2kHz
V(Ripple)=200mVpp
VDD=5V, PO=1W, RL=8Ω
No
VDD=3.6V, f=20Hz to 20kHz,
weighting
Inputs ac-grounded with
A
Ci=2µF
weighting
VDD=3.6V
f=217Hz
VIC=1Vpp
0.05
Feedback resistance
Start-up time from
shutdown
DS6204
Conditions
W
%
-86
dB
-80
105
dB
11.7
µVRMS
8.7
-60
38
VDD=3.6V, CBYPASS=0.1µF
W
40
23
5
联系电话：１５９９９６４４５７９　８３１５１７１５
dB
44
kΩ
ms
芯美电子
AAP6204
Typical Operating Characteristics
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
DS6204
Ver0.1
July 2008
Figure 8.
6
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Typical Operating Characteristics (continued)
Figure 9.
DS6204
Ver0.1
July 2008
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
7
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Typical Operating Characteristics (continued)
Figure 15.
DS6204
Ver0.1
July 2008
8
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Application Information
Application Schematics
Figure16 through Figure17 show application schematics
for differential and single-ended inputs. Typical values
are shown in Table1.
Table1. Typical Component Value
Component
RI
C(BYPASS)
CS
CI
Value
40kΩ
0.22µF
1µF
0.22µF
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.
P
DMAX
= 4 * (VDD ) 2 /(2π 2 R L ) ------------(1)
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.
DS6204
Ver0.1
July 2008
9
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Input Capacitor (CI)
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.
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
f =
(3)
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
DS6204
Ver0.1
July 2008
In this example, CI is 0.16µF, so one would likely
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.
Decoupling Capacitor (CS)
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.
10
联系电话：１５９９９６４４５７９　８３１５１７１５
芯美电子
AAP6204
Package Information
TDFN-8
DETAIL A
SYMBOLS
A
A1
b
D
D1
E
E1
e
L
DS6204
Ver0.1
July 2008
MILLIMETERS
MIN.
MAX.
0.70
0.80
0.00
0.05
0.20
0.40
2.90
3.10
2.30
2.90
3.10
1.50
0.65
0.25
0.45
INCHES
MIN.
0.028
0.000
0.008
0.114
MAX.
0.031
0.002
0.016
0.122
0.090
0.114
0.122
0.059
0.026
0.010
0.018
11
联系电话：１５９９９６４４５７９　８３１５１７１５