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PDF APA4838 Data sheet ( Hoja de datos )
| Número de pieza | APA4838 | |
| Descripción | Stereo 2.8W Audio Power Amplifier | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APA4838
Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
Features
General Description
• Operating Voltage : 4.5V to 5V
The APA4838 is a monolithic integrated circuit , which
• Stereo switchable bridged/single-ended
power amplifiers
provides DC volume control , and a stereo bridged
audio power amplifiers capable of producing 2.8W
(2.3W) into 3Ω with less than 10% (1.0%) THD+N.
• DC Volume Control Interface , 0dB to –78dB
APA4838 includes a DC volume control , stereo
bridge-tied and single-ended audio power amplifiers
with precision scale
, stereo docking outputs , and a selectable gain con-
• Supply Current , IDD = 15mA at Stereo BTL
• Low Shutdown Current , IDD = 0.7µA
trol , that makes it optimally fittable for notebook PC
, multimedia monitors , and other portable
applications. The attenuator range of the volume
• Bridge-Tied Load (BTL) or Single-Ended-(SE) control in APA4838 is from 0dB (DC_Vol=0.8VDD) to
Modes Operation
• Output Power at 1% THD+N , V =5V
DD
–78dB (DC_Vol=0V) with 31 steps. Both of the depop
circuitry and the thermal shutdown protection circuitry
are integrated in APA4838 , that reduces pops and
– 2.3W/Ch (typ) into a 3 Ω Load
clicks noise during power up or shutdown mode op-
– 2.0W/Ch (typ) into a 4 Ω Load
eration , and protects the chip from being destroyed
by over temperature failure. To simplify the audio
– 1.2W/Ch (typ) into a 8 Ω Load
• Output Power at 10% THD+N , VDD=5V
– 2.8W/Ch (typ) into a 3 Ω Load
system design , APA4838 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
– 2.3W/Ch (typ) into a 4 Ω Load
– 1.5W/Ch (typ) into a 8Ω Load
• Single-ended mode at 1.0% THD+N
– 95mW/Ch (typ) into 32Ω Load
by the HP Sense input control pin signal. Besides
the low supply current design to increase the effi-
ciency of the amplifiers , APA4838 also features a
shutdown function which keeps the supply current
only 0.7µA (typ).
• Depop Circuitry Integrated
• Thermal shutdown protection and over current Pin Description
protection circuitry
• High supply voltage ripple rejection
• PC99 Compliant
• 28-pin TSSOP-P (with enhanced thermal pad)
power package available
Applications
• Notebook and Desktop Computers
• Multimedia Monitors
• Portable Applications
GND
Shutdown
Gain Select
Mode
M ute
V
DD
DC Vol
GND
Right Dock
Right In
Beep In
Left In
Left Dock
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 Right Out +
27 VDD
26 Right Out -
25 Right Gain 2
24 Right Gain 1
23 GND
22 BYPASS
21 HP Sense
20 GND
19 Left Gain 1
18 Left Gain 2
17 Left Out -
16 VDD
15 Left Out +
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright ANPEC Electronics Corp.
Rev. A.1 - Apr., 2003
1
www.anpec.com.tw
1 page  
APA4838
Electrical Characteristics (Cont.)
Electrical Characteristics for SE Mode Operation (Cont.)
The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C
Symbol
Parameter
Test Conditions
VOS
PO
THD+N
PSRR
XTALK
SNR
VN
Output Offset Voltage
Output Power
Total Harmonic Distortion
plus Noise
Power Supply Rejection
Ratio
Channel Separation
Signal-to-Noise Ratio
Output Noise Voltage
VIN=0V
THD=1%,
THD=10%,
f=1kHz, RL=32Ω
f=1kHz, RL=32Ω
AV= 1 , VOUT=1VRMS, RL=10kΩ, f=1kHz
PO =75mW, RL=32Ω, AV= 1, f=1kHz
VRIPPLE=100mVRMS , f=120Hz, CB=2.2µF
CB=2.2µF, RL=8Ω , f=1kHz
PO =75mW, RL=32Ω, A-Wtd Filter
RL=32Ω, A-Wtd Filter
APA4838
Typ.
5
95
110
0.05
0.07
52
90
102
20
Unit
mV
mW
%
%
dB
dB
dB
µV
Pin Description
Pin
Name
No
GND
1, 8, 14,
20, 23
Shutdown
2
Gain Select
3
Mode
4
Mute
VDD
DC_Vol
Right Dock
Right In
Beep In
Left In
Left Dock
Left Out +
Left Out -
Left Gain 2
Left Gain 1
HP Sense
5
6, 16, 27
7
9
10
11
12
13
15
17
18
19
21
I/O Description
Ground connection for circuitry.
I Shutdown mode control signal input, place entire IC in shutdown mode when
held high, Idd=0.7uA
I Gain select input pin, logic high will switch the amplifier to external gain
mode, and logic low will switch to internal unity gain.
I Mode select input pin, fixed gain when logic L and gain adjustable mode
when logic H.
I Mute control input pin, active H.
Supply voltage input pin
I Volume control function input pin.
O Right docking output pin
I Right channel audio input pin
I Beep signal input pin
I Left channel audio input pin
O Right docking output pin
O Left channel positive output pin
O Left channel negative output pin
Connect pin 2 of the external gain setting resistor for left channel
Connect pin 1 of the external gain setting resistor for left channel
I Headphone sense control pin
Copyright ANPEC Electronics Corp.
Rev. A.1 - Apr., 2003
5
www.anpec.com.tw
5 Page 
APA4838
Typical Characteristics (Cont.)
THD+N vs. Frequency
10
VDD=5V
RL=16Ω
Po=150mW
SE
1
Av=1
Av=2
0.1 Av=4
0.01
20
100 1k
Frequency (Hz)
20k
THD+N vs. Output Power
10
VDD=5V
RL=16Ω
Av=1
SE
1
0.1
0.01
10m
f=20Hz
f=1KHz
f=20KHz
100m
Output Power (W)
300m
THD+N vs. Frequency
10
VDD=5V
RL=32Ω
Po=75mW
SE
1
Av=1
Av=2
0.1 Av=4
0.01
20
100 1k
Frequency (Hz)
20k
THD+N vs. Output Power
10
VDD=5V
RL=32Ω
Av=1
SE
1
f=20Hz
f=20KHz
0.1
f=1KHz
0.01
10m
50m 100m 200m
Output Power (W)
Copyright ANPEC Electronics Corp.
Rev. A.1 - Apr., 2003
11
www.anpec.com.tw
11 Page | ||
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| PDF Descargar | [ Datasheet APA4838.PDF ] | |
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