ADVANCEDPHOTONIX AP5668

深圳市国盛电子商行
0755-83550077
AP5668
AUDIO PRODUCT
3-CH Stereo 2.6W Audio Amplifier with DC_Volume Control
Features
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General Description
Low Operation Current with 7mA
Improved De-pop Circuitry to Eliminate
Turn-on and Turn-Off Transients in Outputs
32 Steps Volume Adjustable by DC Voltage
with Hysteresis
High S/N Ratio
2.6W per Channel Output Power into 4Ω Load
at 5V, BTL Mode
Two output modes allowable with BTL and
SE Modes Selected by HP-IN
Low Current Consumption in Shutdown Mode
(1uA)
Low THD+N and Low Noise
Maximum Output Swing Clamping Function
Thermal Shutdown Protection and Over
Current Protection Circuitry
Available in QFN4x4-20L and TSSOP20
Packages
Application
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Portable-DVD
LCD Monitor or TVs
Audio Equipments
AP5668 is a monolithic integrated circuit, which
provides precise DC volume control, and a stereo
bridged 3 channel audio power amplifiers capable
of producing 2.6W into 4Ω with less than 10%
THD+N. The attenuator range of the volume in
AP5668 is from 20dB (DC_Vol=0V) to -80dB
(DC_Vol=3.60V) with 32 steps. The advantage of
internal gain setting can be less components and
PCB area. Both of the de-pop circuitry and the
thermal shutdown protection circuitry are
integrated in AP5668, that reduce pops and clicks
noise during power up or shutdown mode
operation. It also improves the power off pop noise
and protects the chip from being destroyed by
over temperature and short current failure.
The AP5668 uses advanced 1-wire control mode
to complete the channel select and shutdown
function.
To simplify the audio system design, AP5668
combines a stereo bridge-tied loads (BTL) mode
for speaker drive and a stereo single-end (SE)
mode for headphone drive into a single chip,
where both modes are easily switched by the
HP-IN input control pin signal.
AP5668 is available in QFN4x4-20L andTSSOP20
package.
Ordering and Marking Information
Part ID
Package
Packing
AP5668
TSSOP20
3000PCS / Reel Tape
AP5668
QFN4x4-20L
3000PCS / Reel Tape
Chip Marking:
AP5668 XXXXXXX
XXXXXXX- Date Code
Note: AP5668 lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination
finish; which are fully compliant with RoHS.
SHENZHEN GUOSHENG ELECTRONIC BUSINESS
TEL:0755-83550077 13728872886
Version: 1.1 1 / 9 深圳市国盛电子商行
0755-83550077
AP5668
AUDIO PRODUCT
Block Diagram
VOLUME
INL1-
VoLP
INR1-
VoLN
Volume Control
INL2-
Analog
Input
INR2-
BYPASS
INL3-
BYPASS
INR3VoRP
VoRN
HP_IN
Channel Select
Earphone Select
CTRL
VDD
Mute Control
Depop
Circuit
MUTE
GND
Absolute Maximum Ratings
VDD
Supply voltage
-0.3V to 6V
VI
Input voltage
-0.3V to VDD+0.3V
TA
Operation free-air temperature range
-40°C to 85°C
TJ
Operation free-air junction temperature range
-40°C to 125°C
TSTG
Storage temperature range
-65°C to 150°C
TSLD
Soldering temperature
300°C, 5sec
Recommended Operating Conditions
VDD
Supply Voltage
VDD
MUTE Input High Voltage
VIH
HP-IN Input High Voltage
VDD=5.0V
UNIT
2.5
5.5
V
1
V
4
1.4
MUTE Input low Voltage
HP-IN Input low Voltage
MAX
2
CTRL Input High Voltage
VIL
MIN
VDD=5.0V
CTRL Input low Voltage
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TEL：0755-83550077
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0.4
深圳市国盛电子商行
0755-83550077
AP5668
AUDIO PRODUCT
Thermal Information
Parameter
Symbol
Package
MAX
UNIT
Thermal Resistance(Junction to Ambient)
θJA
QFN4x4-20L
31
°C/W
Thermal Resistance(Junction to Ambient)
θJA
TSSOP20
80
°C/W
Electrical Characteristics (unless otherwise noted,，VDD =5V, Gain=19.5dB, R =8Ω, T =25°C, CBYP=1μF。)
Symbol
Parameter
VDD
Supply Power
IDD
Shutdown Current
ISD
Shutdown Current
VOS
Output offset
voltage
Test Conditions
MIN
TYP
2.5
MAX
UNIT
5.5
V
HP-IN=0V
7
HP-IN=5V
4.3
HP-IN=0V，VCTRL =0V
1
uA
5
mV
mA
Speaker Mode
THD+N=10%,f=1KHZ
PO
Output Power
THD+N=1%,f=1KHZ
RL=4Ω
2.5
RL=8Ω
1.6
RL=4Ω
1.9
RL=8Ω
1.3
PO=1.2W, RL=4Ω
W
W
0.5
THD+N
Total Harmonic
Distortion Plus
Noise
CS
Crosstalk
RL=8Ω, f=1KHz
75
dB
SNR
Signal-to Noise
Ratio
PO=1.1W, RL=8W, A-weighting
85
dB
PO=0.9W, RL=8Ω
f=1KHz
0.23
%
Earphone Mode
THD+N=10%,f=1KHz
PO
Output Power
THD+N=1%,f=1KHz
RL=16Ω,
200
RL=32Ω,
110
RL=16Ω,
160
RL=32Ω,
85
PO=125mW, RL =16
mW
0.04
THD+N
Total Harmonic
Distortion Plus
Noise
CS
Crosstalk
RL=32Ω, f=1KHz
80
dB
SNR
Signal-to Noise
Ratio
PO=75mW, SE, RL =32 A-weighting
90
uV
PO=65mW, RL =32
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TEL：0755-83550077
Version: 1.1 3 / 9 f=1KHz
0.04
%
深圳市国盛电子商行
0755-83550077
AP5668
AUDIO PRODUCT
Pin Configuration
QFN4x4-20L
(TOP VIEW)
TSSOP20
(TOP VIEW)
Pin Description
Pin No.
Name
QFN4x4-20L
TSSOP20
19
1
20,1,2
2,3,4
3
BYPASS
I/O
I/O
Pin Description
Bias voltage generator
INL1-,INL2-,INL3-
I
Left channel negative input terminal
5
MUTE
I
Mute control signal input, hold low for
normal operation, hold high to mute
4
6
GND
5,6,7
7,8,9
8
10
VOLUME
9
11
HP-IN
10,17
12,19
VDD
11
13
VoRP
O
Right channel positive output
13
14
VoRN
O
Right channel negative output
12,15
15,16
PGND
14
17
VoLN
O
Left channel negative output
16
18
VoLP
O
Left channel positive output
18
20
CTRL
I
Input selection and shutdown control
INR3-,INR2-,INR1-
Analog ground
I
I/O
I
Right channel negative input terminal
Setting the maximum output swing
Output mode control input, high for SE
output and low for BTL mode
Power supply
Power ground
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AP5668
AUDIO PRODUCT
Input Control Table
CTRL
MUTE
HP-IN
Operation mode
L
X
X
Shutdown mode
H
L
L
Speak output
H
L
H
Earphone output
H
H
X
mute
Typical Application Circuit
100uF
0.1uF
2
INL1-
100KΩ
1uF
12,19
HP-IN
Signal
VDD
100uF
18
VoLP
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
9
3
8
4
7
INR1-
1KΩ
8Ω
VoLN
17
INL2VoRP
100uF
13
INR2-
1KΩ
AP5668
TSSOP20
8Ω
VoRN
INL3INR3-
BYPASS
14
1
2.2uF
20
CTRL
MUTE
HP-IN
Signal
100KΩ
11
HP-IN
VOLUME
4
10
50K
GND
6,15,16
AP5668-TSSOP20 Application Circuit
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AP5668
AUDIO PRODUCT
Typical Operating Characteristics (unless otherwise noted，VDD =5V, Gain=19.5dB, R =8Ω, T =25°C,
CBYP=1μF)
THD+N vs Output Power
THD+N vs Output Power
20
20
RL=4ohm Gain=19.5dB
VDD= 3.6V , 4.2V , 5V 10
10
RL=8ohm Gain=19.5dB
VDD= 3.6V , 4.2V , 5V 5
5
2
%
2
%
1
1
0.5
0.5
0.2
0.2
1m 2m
5m 10m
100m
500m 1
2
0.1
1m 2m
4
5m 10m
THD+N VS FREQUENCY
2
Cross-Talk
TTTTTTT
TTT
TTTTTTTTTT
TTTTTTTTTTT T
RL=8ohm Gain=19.5dB
RL=8ohm Gain=19.5dB
-20
Vo=1Vp‐p 1
Vo=1Vp‐p
-40
0.5
%
500m 1
+0
5
2
100m
W
W
d
B
0.2
0.1
-60
L to R R to L
-80
0.05
-100
0.02
0.01
20
50 100 200 500 1k 2k
5k
-120
20
20k
50 100 200
500
1k
2k
5k
Hz
Hz
NOISE FLOOR FFT
+22
-30
RL=8ohm Gain=19.5dB
-40
+21
-50
-70
-80
A
-90
-100
+19
+18
+17
+16
-110
-120
-130
10
RL=8ohm Gain=19.5dB
Cin=1uF
+20
d
B
g
-60
d
B
V
Frequency Response
20
50 100 200
500 1k
2k
5k 10k 20k
Hz
+15
20
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TEL：0755-83550077
Version: 1.1 6 / 9 50 100 200 500 1k 2k
Hz
5k
20k
20k
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AP5668
AUDIO PRODUCT
Volume Control Table_BTL Mode（VDD=5.0V）
STEP
GAIN(dB)
High(V)
Low(V)
STEP
GAIN(dB)
High(V)
Low(V)
1
20
0.22
0
17
-12
1.99
1.93
2
18
0.33
0.28
18
-14
2.10
2.04
3
16
0.44
0.39
19
-16
2.22
2.14
4
14
0.56
0.50
20
-18
2.32
2.26
5
12
0.66
0.62
21
-20
2.43
2.37
6
10
0.78
0.72
22
-22
2.54
2.48
7
8
0.88
0.83
23
-24
2.65
2.59
8
6
0.99
0.95
24
-26
2.76
2.70
9
4
1.11
0.04
25
-28
2.87
2.81
10
2
1.21
1.16
26
-30
2.98
2.92
11
0
1.32
1.26
27
-32
3.08
3.04
12
-2
1.44
1.38
28
-34
3.21
3.14
13
-4
1.55
1.49
29
-36
3.32
3.25
14
-6
1.66
1.60
30
-38
3.44
3.37
15
-8
1.77
1.71
31
-40
3.57
3.49
16
-10
1.89
1.83
32
-80
5.00
3.60
Application Information
MUTE Function
inverting configuration.
SE Gain ： Av=-RF/Ri
The AP5668 mutes the amplifier outputs when logic high is
applied to the MUTE pin. Applying logic low to the MUTE
pin returns the AP5668 to normal operation. Prevent
unanticipated mute behavior by connecting the Mute pin to
logic high or low. Do not let the Mute pin float.
Output Selection and Shutdown Function
The AP5668 can use CTRL pin to complete 3 channel
input selection. It will select channel 1 when that’s detect
first pulse, select channel when that’s detect second pulse,
and select channel 3 when that’s detect third pulse. The
AP5668 will be shutdown mode if the CTRL pin is keeping
low level over 100us. The default value of CTRL pin will
low level if no any pulse input。The AP5668 must set up
BTL Gain： Av=-2*RF/Ri
The minimum input resistance is 10kΩ when gain setting is
20dB and the resistance will ramp up when close loop gain
below 20dB. The input resistance has wide variation
(+/-10%) caused by process variation.
Input Capacitor (Ci )
In the typical application, an input capacitor, Ci, is required
to allow the amplifier to bias the input signal to the proper
DC level for optimum operation. In this case, Ci and the
minimum input impedance Ri (25kΩ) form a high-pass filter
with the corner frequency determined in the following
equation :
after the chip is shutdown. The CTRL pin must pull to low
level to shutdown mode from one channel to other
channel.
Input Resistance (Ri)
The gain for each audio input of the APA2068 is set by the
The value of Ci is important to consider as it directly affects
the low frequency performance of the circuit. Also the
value of Ci will affect the circuit startup and the POP in
shutdown.
internal resistors (Ri and RF) of volume control amplifier in
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TEL：0755-83550077
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AP5668
AUDIO PRODUCT
Volume Control Function
Effective Bypass Capacitor CBYP
AP5668 has an internal stereo volume control whose
A power amplifier, proper supply bypassing, is critical for
setting is a function of the DC voltage applied to the
low noise performance and high power supply rejection.
VOLUME input pin. The AP5668 volume control consists
The capacitor location on the BYPASS pin should be as
of 32 steps that are individually selected by a variable DC
close to the device as possible. The effect of a larger
voltage level on the VOLUME control pin. The range of the
supply bypass capacitor is to improve PSRR due to
steps controlled by the DC voltage, are from 20dB to
increased half-supply stability.
-80dB. Each gain step corresponds to a specific input
To avoid the start-up pop noise, the bypass voltage should
voltage range, as shown in table. To minimize the effect of
rise slower than the input bias voltage and the relationship
noise on the volume control pin, which can affect the
shown in equation should be maintained.
selected gain level, hysteresis and clock delay are
implemented. The amount of hysteresis corresponds to
half of the step width, as shown in volume control graph.
Gain vs DC Volume Voltage
DC Volume (V)
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TEL：0755-83550077
Package Information
Version: 1.1 8 / 9 深圳市国盛电子商行
0755-83550077
AP5668
AUDIO PRODUCT
QFN4x4-20L
TSSOP20
SHENZHEN GUOSHENG ELECTRONIC BUSINESS
TEL：0755-83550077
Version: 1.1 9 / 9