IS31AP2145-CLS2-TR [ISSI]
Audio Amplifier, 2W, 1 Channel(s), 1 Func, PBGA9, 1.42 X 1.42 MM, LEAD FREE, WCSP-9;
| 型号： | IS31AP2145-CLS2-TR |
| 厂家： | 
INTEGRATED SILICON SOLUTION, INC |
| 描述： | Audio Amplifier, 2W, 1 Channel(s), 1 Func, PBGA9, 1.42 X 1.42 MM, LEAD FREE, WCSP-9 放大器 商用集成电路 |
| 文件： | 总13页 (文件大小：520K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IS31AP2145
2W@4.2V MONO CLIP-LESS & FILTER-LESS
CLASS-D AUDIO POWER AMPLIFIER
SEPTEMBER 2011
GENERAL DESCRIPTION
FEATURES
The IS31AP2145 is a 2W@4.2V mono, clip-less,
filter-less, high efficiency Class-D audio power
amplifier with automatic gain control.
Filter-less Class-D architecture
AGC enable/disable function via PCC wire
serial interface
2W/Ch into 4Ω at 4.2V (10% THD+N)
Power supply range: 3.3V to 4.5V
Selectable attack and release times
Minimum external components
High efficiency: 90%
The IS31AP2145 integrates AGC (Automatic Gain
Control) function to automatically prevent distortion of
the audio signal by which we can enhance audio
quality and also protect speaker from damage at high
power levels. The AGC function and its attack
time/release time are selectable via the CTRL pin. The
IS31AP2145 also provides thermal and over current
protection functions.
Click-and-pop suppression
Low shutdown current: 0.1μA
Fast wake-up time: 46ms
In addition to these features, 90% high efficiency,
improved RF-rectification immunity, a fast start-up time
and small package size make IS31AP2145 ideal
choice for cellular handsets, PDAs and other portable
applications.
Short-circuit and thermal protection
Space-Saving 1.42mm × 1.42mm WCSP
APPLICATIONS
Wireless or cellular handsets and PDAs
Portable navigation devices
Portable DVD player
Notebook PC
IS31AP2145 is available in a 1.42mm × 1.42mm 9-ball
WCSP package.
Educational toys
USB speakers
Portable gaming
TYPICAL APPLICATION CIRCUIT
Vbat
VDD
C
IN
RI
RI
IN-
1µF
0.1µF
33nF
Differential
Input
PWM
H- Bridge
VO+
CIN
IN+
VO-
33nF
CTRL
VREF
GND
Control
Logic
MCU
AGC
Bias
Internal
Oscillator
1µF
300k
Figure 1 Typical Application Schematic with Differential Input
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. A, 08/22/2011
IS31AP2145
Vbat
0.1µF
VDD
C
IN
RI
RI
IN-
1µF
33nF
Singer-Ended
Input
PWM
H- Bridge
VO+
VO-
C
IN
IN+
33nF
CTRL
VREF
GND
Control
Logic
MCU
AGC
Bias
Internal
Oscillator
1µF
300k
Figure 2 Typical Application Schematic with Single-Ended Input
Integrated Silicon Solution, Inc. – www.issi.com
2
Rev. A, 08/22/2011
IS31AP2145
PIN CONFIGURATION
Package
Pin Configuration (Top view)
WCSP-9
PIN DESCRIPTION
No.
Pin
I/O
Description
A1
IN+
I
-
Positive differential input
Power supply
A2
A3
VDD
VO+
O
-
Positive BTL output
B1,B3
B2
GND
VREF
IN–
High-current ground
I
Internally connected to VDD pin.
Negative differential input
C1
I
Shutdown and AGC control terminal
(Single wire interface)
CTRL
VO-
C2
C3
I
O
Negative BTL output
ORDERING INFORMATION
Industrial Range: -40°C to +85°C
Order Part No.
Package
WCSP-9, Lead-free
QTY/Reel
IS31AP2145-CLS2-TR
3000
Integrated Silicon Solution, Inc. – www.issi.com
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Rev. A, 08/22/2011
IS31AP2145
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Supply voltage, VDD
-0.3V ~ +4.5V
Voltage at any input pin
-0.3 V ~ VDD +0.3V
-40°C ~ +150°C
-65°C ~ +150°C
260°C
Junction temperature, TJMAX
Storage temperature range, Tstg
Lead temperature 1.6mm (1/16 inch) from case for 10s
Thermal resistance θJA (WCSP)
90°C/W (Note 2)
RECOMMENDED OPERATING CONDITIONS
Parameter
Min.
Max.
Unit
Supply voltage, VDD
3.3
1.4
0
4.5
VDD
0.4
V
V
High-level input voltage, VIH
Low-level input voltage, VIL
Operating free-air temperature, TA
CTRL
CTRL
V
-40
+85
°C
ELECTRICAL CHARACTERISTICS
Gain = 18dB, TA = -40°C ~ +85°C, unless otherwise noted. Typical value are TA = +25°C, Gain = 18dB.
Symbol Parameter
Condition
Min.
Typ.
Max. Unit
Output offset voltage
(measured differentially)
| VOS |
IQ
VI = 0V, VDD = 3.3V ~ 4.5V
1
25
mV
mA
μA
VDD = 4.5V, no load
VDD = 3.3V, no load
VCTRL = 0.4V,
3.0
2.4
Quiescent current
ISD
Shutdown current
0.1
1
VDD = 3.3V ~ 4.5V
fsw
Switching frequency
VDD = 3.3V ~ 4.5V
300
300
18
kHz
kΩ
RCTRL Pull low resistor of CTRL pin
Gain
VDD = 3.3V ~ 4.5V
CTRL
dB
Low status of CTRL pin setting
TCTRL_LO
time
1
70
70
μs
High status of CTRL pin
setting time
TCTRL_HI
1
μs
μs
μs
TOFF
TLAT
Power down mod setting time
200
200
AGC1, AGC2 , AGC OFF
mode setting time
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Rev. A, 08/22/2011
IS31AP2145
Electrical Characteristics
Gain = 18dB, AGC function off, TA = -40°C ~ +85°C, unless otherwise (Note 3).
Typical value are TA = +25°C, Gain = 18dB.
Symbol Parameter
Condition
Min.
Typ.
Max.
Unit
VDD = 4.2V
VDD = 3.6V
1.2
0.85
2.0
THD+N = 10%
f = 1kHz, RL = 8Ω
W
V
DD = 4.2V
THD+N = 10%
f = 1kHz, RL = 4Ω
W
W
W
VDD = 3.6V
VDD = 4.2V
VDD = 3.6V
VDD = 4.2V
VDD = 3.6V
1.5
PO
Output power
0.95
0.71
1.7
THD+N = 1%
f = 1kHz, RL = 8Ω
THD+N = 1%
f = 1kHz, RL = 4Ω
1.2
VDD = 4.2V, PO = 0.6W, RL = 8Ω, f = 1kHz
VDD = 4.2V, PO = 1.0W, RL = 4Ω, f = 1kHz
0.18
0.20
Total harmonic
distortion plus noise
THD+N
VN
%
VDD = 4.2V, f = 20Hz ~ 20kHz, inputs
Output voltage noise
60
μVrms
AC-grounded with CI = 1μF A-Weighting
Wake-up time from
shutdown
TWU
SNR
VDD = 3.6V
46
93
ms
dB
dB
Signal-to-noise ratio
PO = 1.0W, RL = 8Ω, VDD = 4.2V
Power supply rejection VDD = 3.6V ~ 4.5V, f = 1kHz
ratio Input grounded
PSRR
-72
Notes:
1. Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2. For WCSP 9 package, thermal resistance θJA depends largely on the heat-sinking area. When the area is 50mm2 , θJA is 195°C/W. When
the area is 500mm2 , θJA is 135°C/W. While large copper plating area of power ground is used, θJA can decrease to 90°C/W.
3. Guaranteed by design.
Integrated Silicon Solution, Inc. – www.issi.com
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Rev. A, 08/22/2011
IS31AP2145
TYPICAL PERFORMANCE CHARACTERISTICS
20
10
5
Vcc=4.2V
Vcc = 4.2V
10
R
L
RL
Po= 600mW
f = 1kHz
2
1
5
2
1
0.5
0.2
0.1
0.5
0.05
0.2
0.1
0.02
0.01
20
50 10 0 20 0 50 0 1k 2k
5k
20k
10m 20m
50m 10 0m 20 0m 50 0m
1
2
Figure 4 THD+N vs. Frequency
Figure 3 THD+N vs. Output Power
10
5
20
10
Vcc = 3.6V
Vcc = 3.6V
R
L
RL
Po= 400mW
f = 1kHz
2
1
5
2
1
0.5
0.2
0.1
0.5
0.05
0.2
0.1
0.02
0 01
10m
20m
50m 10 0m 20 0m
50 0m
1
20
50 10 0 20 0 50 0 1k 2k
5k
20k
Figure 6 THD+N vs. Frequency
Figure 5 THD+N vs. Output Power
20
10
Vcc = 4.2V
R
L
f = 1kHz
5
2
1
0.5
0.2
0.1
10m 20m
50m 10 0m
50 0m
1
2 3
Figure 8 THD+N vs. Frequency
Figure 7 THD+N vs. Output Power
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Rev. A, 08/22/2011
IS31AP2145
20
Vcc = 3.6V
Vcc = 3.6V
10
5
R
L
R
L
f = 1kHz
Po= 800mW
2
1
0.5
0.2
0.1
10m 20m
50m 10 0m 20 0m 50 0m
1
2
Figure 9 THD+N vs. Output Power
Figure 10 THD+N vs. Frequency
VCC=4.2V
VCC=4.2V
Figure 11 Efficiency vs. Output Power
Figure 12 PSRR vs. Frequency
R
L
THD+N=10%
R
L
THD+N=1%
R
L
THD+N=10%
R
L
THD+N=1%
Figure 13 Output Power vs. Supply Voltage
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Rev. A, 08/22/2011
IS31AP2145
APPLICATION INFORMATION
Digital Amplifier
AGC (Automatic Gain Control) Control Function
This is the function to control the output in order to
obtain a maximum output level without distortion when
an excessive input is applied which would otherwise
cause clipping at the differential signal output. That is,
with the AGC function, IS31AP2145 lowers the gain of
the digital amplifier to an appropriate value so as not to
cause clipping at the differential signal output.
IS31AP2145 has digital amplifiers with analog input,
PWM pulse output, and maximum output of 2W
(RL=4Ω). Distortion of PWM pulse output and noise of
the signal is reduced.
In addition, IS31AP2145 has been designed so that
high-efficiency can be maintained within an average
power range that is used for mobile terminal.
No Distortion
IS2145
+Peak amplitude
Non-Clip Digital Amplifier
Power-supply
voltage is the
maximum
Input
Signal
Output
Signal
Amplification
The output clip is detected, and
so as not to distort the output,
the amplifier gain is adjusted.
-Peak amplitude
Power-supply voltage decrease
No Distortion
IS2145
+Peak amplitude
Non-Clip Digital Amplifier
Power-supply
voltage
decrease
Input
Signal
Output
Signal
Amplification
To avoid the influence of
power supply declining, and so
as not to distort the output, the
amplifier gain is adjusted.
-Peak amplitude
Figure 14 Operation Outline of Clip-less Function
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Rev. A, 08/22/2011
IS31AP2145
The attack time and the release time of AGC control
have two levels (refer to Table 1). They are selected
with the CTRL terminal (refer to Table 2 and Figure
18). The attack time is a time interval that gain falls
from 18dB to 10dB with a big signal input enough. And
the Release Time is a time from target attenuation to
no AGC attenuation.
PCC Wire Serial Interface
By using PCC wire (Pulse Count Control) serial
interface to the CTRL terminal, the following can be
set: AGC1, AGC2, AGC OFF, and power-down mode.
The interface records rising edges of the CTRL pin and
decodes them into 3 different states. The 3 mode
settings available are indicated in Table 2.
The PCC wire serial interface has flexible timing. The
pulse data can be clocked-in at speeds between
15kHz and 1MHz. After the pulse data is submitted,
CTRL has to be held high for the time TLAT to have
the latched pulse data to be effective.
Before programming the subsequent function mode,
the CTRL needs to be held low for TOFF.
When entering the Power-down mode, the CTRL
needs to be held low for TOFF.
Table 1 Attack Time and Release Time
AGC mode
Attack Time
Release Time
AGC1
(Recommended)
45ms
10ms
2.6s
1.2s
AGC2
Assuming no restriction from power supply, the audio
output signal would be as in Figure 15.
PCC Wire Serial Interface Timing
When CTRL is held low for an amount of time greater
than TOFF, the IS31AP2145 enters into shutdown
mode and draws less than 1µA from VCC. The internal
data register is reset to zero during shutdown.
Figure 15 Assuming no Restriction from Power Supply, the
Audio Output Signal
Regularly, the output is distorted because of the
restriction from power supply, as shown in Figure 16.
Figure 16 AGC Function OFF
With the AGC function of IS31AP2145, the optimum
output power can be obtained along with the minimal
distortion. The Figure 17 shows the outcome of AGC
function.
Figure 18 AGC Function Mode Setting
Table 2 Mode Settings
Attack Time
Release Time
CTRL Status
Function
Figure 17 AGC Function ON
Connect to VDD
1 Pulse
AGC OFF
AGC1
2 Pulse
AGC2
3 Pulse
AGC OFF
Power-down
Pull Low
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Rev. A, 08/22/2011
IS31AP2145
PCB Layout
When to Use an Output Filter
As output power increases, interconnect resistance
(PCB traces and wires) between the amplifiers, load
and power supply create a voltage drop. The voltage
loss on the traces between the IS31AP2145 and the
load results in lower output power and decreased
efficiency. Higher trace resistance between the supply
and the IS31AP2145 has the same effect as a poorly
regulated supply. Increased ripple on the supply line
also reduces the peak output power. The effects of
residual trace resistance increases as output current
increases due to higher output power. To maintain the
highest output voltage swing and corresponding peak
output power, the PCB traces that connect the output
pins to the load and the supply pins to the power
supply should be as wide and as short as possible to
minimize trace resistance.
Design the IS31AP2145 without an output filter if the
traces from amplifier to speaker are short. Wireless
handsets and PDAs are good applications for class-D
without a filter.
A ferrite bead filter can be used if there is concern
about EMI effects, or if there are frequency sensitive
circuits wherein the frequency is greater than 1MHz.
This is good for circuits that have to pass FCC and CE
standards. If choosing a ferrite bead, select one with
high impedance at high frequencies, but very low
impedance at low frequencies.
Use an LC output filter if there are low frequency (<
1MHz) EMI sensitive circuits involved in and/or there
are long leads from amplifier to speaker.
The use of power and ground planes will give the best
THD+N performance. In addition to a reduction in trace
resistance, the power planes also form a parasitic
capacitor which aids in filtering the power supply.
Figure 19 and Figure 20 show typical ferrite bead and
LC output filters.
The inductive nature of the transducer load can also
result in overshoot on one or both edges, clamped by
the parasitic diodes to GND and VDD in each case.
From an EMI standpoint, this is an aggressive
waveform that can radiate or conduct to other
components in the system and cause interference. It is
essential to keep the power and output traces short
and well shielded if possible. Use of ground planes,
beads, and microstrip layout techniques are all useful
in preventing unwanted interference.
Figure 19 Typical Ferrite Chip Bead Filter
As the distance between the IS31AP2145 and the
speaker increases, the amount of EMI radiation will
increase.
Ferrite chip inductors placed close to the IS31AP2145
may be needed to reduce EMI radiation. The value of
the ferrite chip is application dependent.
Figure 20 Typical LC Output Filter, Cutoff Frequency of
27 kHz
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Rev. A, 08/22/2011
IS31AP2145
CLASSIFICATION REFLOW PROFILES
Profile Feature
Pb-Free Assembly
Preheat & Soak
150°C
200°C
60-120 seconds
Temperature min (Tsmin)
Temperature max (Tsmax)
Time (Tsmin to Tsmax) (ts)
Average ramp-up rate (Tsmax to Tp)
3°C/second max.
Liquidous temperature (TL)
Time at liquidous (tL)
217°C
60-150 seconds
Peak package body temperature (Tp)*
Max 260°C
Time (tp)** within 5°C of the specified
classification temperature (Tc)
Max 30 seconds
Average ramp-down rate (Tp to Tsmax)
Time 25°C to peak temperature
6°C/second max.
8 minutes max.
Figure 21 Classification Profile
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Rev. A, 08/22/2011
IS31AP2145
TAPE AND REEL INFORMATION
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Rev. A, 08/22/2011
IS31AP2145
PACKAGING INFORMATION
WCSP-9
Note: All dimensions in millimeters unless otherwise stated.
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13
Rev. A, 08/22/2011
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