APA4838
Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain
Features
•Operating Voltage : 4.5V to 5V
•Stereo switchable bridged/single-ended power amplifiers
•DC Volume Control Interface , 0dB to –78dB with precision scale
•Supply Current , IDD = 15mA at Stereo BTL
•Low Shutdown Current , IDD = 0.7µA
•Bridge-Tied Load (BTL) or Single-Ended-(SE) Modes Operation
•Output Power at 1% THD+N , VDD=5V
–2.3W/Ch (typ) into a 3 Ω Load
–2.0W/Ch (typ) into a 4 Ω Load
– 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
–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
General Description
The APA4838 is a monolithic integrated circuit , which 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. APA4838 includes a DC volume control , stereo bridge-tied and single-ended audio power amplifiers , stereo docking outputs , and a selectable gain control , that makes it optimally fittable for notebook PC , multimedia monitors , and other portable applications. The attenuator range of the volume control in APA4838 is from 0dB (DC_Vol=0.8VDD) to –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 clicks noise during power up or shutdown mode operation , and protects the chip from being destroyed by over temperature failure. To simplify the audio system design , APA4838 combines a stereo bridgetied 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 Sense input control pin signal. Besides the low supply current design to increase the efficiency 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 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
Pin Description
GND
Shutdown
Gain Select
Mode
Mute
VDD
DC Vol
GND
Right Dock
Right In
Beep In
Left In
Left Dock
GND
1 |
28 |
2 |
27 |
3 |
26 |
4 |
25 |
5 |
24 |
6 |
23 |
7 |
22 |
8 |
21 |
9 |
20 |
10 |
19 |
11 |
18 |
12 |
17 |
13 |
16 |
14 |
15 |
Right Out +
VDD
Right Out -
Right Gain 2
Right Gain 1
GND
BYPASS
HP Sense
GND
Left Gain 1
Left Gain 2
Left Out -
VDD
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. |
1 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
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APA4838
Ordering and Marking Information
A P A 4 8 3 8 |
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P ac ka g e C o de |
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R : T S S O P -P |
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H and lin g C o de |
T em p . R an g e |
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I : -4 0 to 8 5 ° |
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T em p . R an g e |
H a nd lin g C o de |
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P ac ka ge C od e |
T U : T u be |
T R : T ap e & R e el |
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A P A 48 38 R : |
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A P A 48 38 |
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X X X X X - D a te C o de |
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X X X X X |
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Block Diagram
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Gain Select |
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20KΩ |
20KΩ |
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Mode |
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Mode |
Gain1 |
Gain2 |
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Mute |
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Control |
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Left |
Left |
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HP Sense |
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20KΩ |
0.068µ F |
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DC_Vol |
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10KΩ |
10KΩ |
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Left Dock |
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- Left Out |
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20KΩ |
20KΩ |
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- |
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+ |
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Left |
Left In |
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- |
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20KΩ |
20KΩ |
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Audio Input |
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0.33µ F |
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+ |
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200KΩ |
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Volume |
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Beep In |
Beep |
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- |
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Bias |
Control |
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Detect |
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+ Left Out |
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+ |
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200KΩ |
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31 steps |
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0.33µ F |
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Bias |
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+ |
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Right In |
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Right |
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- |
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+ |
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+ Right Out |
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Audio Input 20KΩ |
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Right Dock |
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- |
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20KΩ |
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20KΩ |
20KΩ |
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Shutdown |
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- Right Out |
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VDD |
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+ |
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Power |
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- |
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GND |
Management |
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10KΩ |
10KΩ |
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20KΩ |
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Bypass |
Click and Pop |
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0.068µ F |
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Suppression |
Right Gain1 |
Right Gain2 |
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Circuitry |
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20KΩ |
20KΩ |
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Copyright ANPEC Electronics Corp. |
2 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
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APA4838
Absolute Maximum Ratings
(Over operating free-air temperature range unless otherwise noted.)
Symbol |
Parameter |
Rating |
Unit |
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VDD |
Supply Voltage |
-0.3 to 6 |
V |
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VIN |
Input Voltage Range, HP sense, Shutdown, |
-0.3 to VDD+0.3 |
V |
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Mute, Mode, Gain Select |
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TA |
Operating Ambient Temperature Range |
-40 to 85 |
° C |
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TJ |
Maximum Junction Temperature |
Internally Limited*1 |
° C |
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TSTG |
Storage Temperature Range |
-65 to +150 |
° C |
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TS |
Soldering Temperature,10 seconds |
260 |
° C |
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VESD |
Electrostatic Discharge |
-2000 to 2000*2 |
V |
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PD |
Power Dissipation |
Internally Limited |
W |
Note:
1.APA4838 integrated internal thermal shutdown protection when junction temperature ramp up to 150°C 2.Human body model: C=100pF, R=1500Ω , 3 positives pulse plus 3 negative pulses
3.Machine model: C=200pF, L=0.5µ F, 3 positive pulses plus 3 negative pulses
Recommended Operating Conditions
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Min. |
Max. |
Unit |
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Supply Voltage, VDD |
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4.5 |
5.5 |
V |
High level threshold voltage, VIH |
Shutdown, Mute, Mode, Gain Select |
2 |
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V |
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HP Sense |
4 |
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Low level threshold voltage, VIL |
Shutdown, Mute, Mode, Gain Select |
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1.0 |
V |
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HP Sense |
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3 |
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Common mode input voltage, VICM |
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VDD-1.0 |
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Thermal Characteristics
Symbol |
Parameter |
Value |
Unit |
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RTHJA |
Thermal Resistance from Junction to Ambient in Free Air |
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TSSOP-P* |
45 |
K/W |
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* 5 in2 printed circuit board with 2oz trace and copper pad through 9 25mil diameter vias. The thermal pad on the TSSOP_P package with solder on the printed circuit board.
Copyright ANPEC Electronics Corp. |
3 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
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APA4838
Electrical Characteristics
Electrical Characteristics for Entire IC
The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for |
TA= 25°C |
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Symbol |
Parameter |
Test Conditions |
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APA4838 |
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Unit |
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Min. |
Typ. |
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Max. |
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VDD |
Supply Voltage |
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4.5 |
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5.5 |
V |
IDD |
Quiescent Power Supply |
VIN=0V, IO=0A |
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15 |
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25 |
mA |
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Current |
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ISD |
Shutdown Current |
VPIN 2= VDD |
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0.7 |
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2.0 |
µ A |
Electrical Characteristics for Volume Attenuators
The following specifications apply for VDD= 5V. Limits apply for TA= 25°C
Symbol |
Parameter |
Test Conditions |
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APA4838 |
Unit |
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Min. |
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Typ. |
Max. |
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CRANGE |
Attenuator Range |
Gain with VPIN 7=5V |
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±0.5 |
dB |
Attenuation with VPIN 7=0V |
-65 |
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-78 |
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AM |
Mute Attenuation |
VPIN 5=5V, Bridged Mode |
-70 |
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dB |
VPIN 5=5V, Single-Ended Mode |
-70 |
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Electrical Characteristics for BTL Mode Operation
The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C
Symbol |
Parameter |
Test Conditions |
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APA4838 |
Unit |
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Typ. |
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VOS |
Output Offset Voltage |
VIN=0V |
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5 |
mV |
PO |
Output Power |
THD=1%, f=1kHz |
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RL=3Ω |
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2.3 |
W |
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RL=4Ω |
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2.0 |
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RL=8Ω |
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1.2 |
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THD=10%, f=1kHz |
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RL=8Ω |
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1.5 |
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THD+N |
Total Harmonic Distortion + Noise |
AVD=2, f=1kHz |
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RL=4Ω , PO =1.5W |
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0.07 |
% |
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RL=8Ω , PO=1W |
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0.07 |
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PSRR |
Power Supply Rejection Ratio |
VRIPPLE=100mVRms CB=2.2µ |
F, |
70 |
dB |
RL=8Ω , f=1kHz |
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XTALK |
Channel Separation |
CB=2.2µ F, f=1kHz, RL=8Ω |
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90 |
dB |
SNR |
Signal-to-Noise Ratio |
VDD=5V, PO =1.1W, RL=8Ω |
,A-Wtd |
95 |
dB |
Filter |
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VN |
Output Noise Voltage |
RL=8Ω ,A-Wtd Filter |
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30 |
µ V |
Copyright ANPEC Electronics Corp. |
4 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
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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 |
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Test Conditions |
APA4838 |
Unit |
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Typ. |
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VOS |
Output Offset Voltage |
VIN=0V |
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5 |
mV |
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PO |
Output Power |
THD=1%, |
f=1kHz, RL=32Ω |
95 |
mW |
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THD=10%, |
f=1kHz, RL=32Ω |
110 |
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THD+N |
Total Harmonic Distortion |
AV= 1 , VOUT=1VRMS, RL=10kΩ , f=1kHz |
0.05 |
% |
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plus Noise |
PO =75mW, RL=32Ω , AV= 1, f=1kHz |
0.07 |
% |
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PSRR |
Power Supply Rejection |
VRIPPLE=100mVRMS , f=120Hz, CB=2.2µ F |
52 |
dB |
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Ratio |
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XTALK |
Channel Separation |
CB=2.2µ F, RL=8Ω , f=1kHz |
90 |
dB |
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SNR |
Signal-to-Noise Ratio |
PO =75mW, RL=32Ω , A-Wtd Filter |
102 |
dB |
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VN |
Output Noise Voltage |
RL=32Ω , A-Wtd Filter |
20 |
µ V |
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Pin Description
Pin |
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I/O |
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Description |
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Name |
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No |
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GND |
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1, 8, 14, |
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Ground connection for circuitry. |
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20, 23 |
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Shutdown |
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2 |
I |
Shutdown mode control signal input, place entire IC in shutdown mode when |
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held high, Idd=0.7uA |
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Gain Select |
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3 |
I |
Gain select input pin, logic high will switch the amplifier to external gain |
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mode, and logic low will switch to internal unity gain. |
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Mode |
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4 |
I |
Mode select input pin, fixed gain when logic L and gain adjustable mode |
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when logic H. |
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Mute |
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5 |
I |
Mute control input pin, active H. |
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VDD |
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6, 16, 27 |
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Supply voltage input pin |
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DC_Vol |
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7 |
I |
Volume control function input pin. |
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Right Dock |
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9 |
O |
Right docking output pin |
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Right In |
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10 |
I |
Right channel audio input pin |
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Beep In |
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11 |
I |
Beep signal input pin |
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Left In |
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12 |
I |
Left channel audio input pin |
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Left Dock |
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13 |
O |
Right docking output pin |
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Left Out + |
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15 |
O |
Left channel positive output pin |
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Left Out - |
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17 |
O |
Left channel negative output pin |
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Left Gain 2 |
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18 |
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Connect pin 2 of the external gain setting resistor for left channel |
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Left Gain 1 |
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19 |
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Connect pin 1 of the external gain setting resistor for left channel |
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HP Sense |
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21 |
I |
Headphone sense control pin |
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Copyright ANPEC Electronics Corp. |
5 |
www.anpec.com.tw |
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Rev. A.1 - Apr., 2003 |
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APA4838
Pin Description (Cont.)
Pin |
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I/O |
Description |
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Name |
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No |
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Bypass |
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22 |
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Bypass pin |
Right Gain 1 |
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24 |
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Connect pin 1 of the external gain setting resistor for right channel |
Right Gain 2 |
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25 |
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Connect pin 2 of the external gain setting resistor for right channel |
Right Out - |
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26 |
O |
Right channel negative output pin |
Right Out + |
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28 |
O |
Right channel positive output pin |
Truth Table for Logic Inputs
Mute |
Gain |
Mode |
HP |
Gain Mode of |
DC Vol. Control |
BTL Output |
SE Output |
Select |
Sense |
Power Amplifier |
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0 |
0 |
0 |
0 |
Unity Gain Setting |
Fixed Level |
Vol. Fixed |
- |
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0 |
0 |
0 |
1 |
Unity Gain Setting |
Fixed Level |
Muted |
Vol. Fixed |
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0 |
0 |
1 |
0 |
Unity Gain Setting |
Adjustable |
Vol. Adjustable |
- |
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0 |
0 |
1 |
1 |
Unity Gain Setting |
Adjustable |
Muted |
Vol. Adjustable |
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0 |
1 |
0 |
0 |
External Gain Setting |
Fixed Level |
Vol. Fixed |
- |
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0 |
1 |
0 |
1 |
External Gain Setting |
Fixed Level |
Muted |
Vol. Fixed |
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0 |
1 |
1 |
0 |
External Gain Setting |
Adjustable |
Vol. Adjustable |
- |
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0 |
1 |
1 |
1 |
External Gain Setting |
Adjustable |
Muted |
Vol. Adjustable |
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1 |
X |
X |
X |
- |
- |
Muted |
Muted |
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Copyright ANPEC Electronics Corp. |
6 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
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APA4838
Typical Application Circuit
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VDD |
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VDD |
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1 |
µ |
F |
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R_var |
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DC Vol Control |
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VDD |
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20KΩ |
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20KΩ |
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100KΩ |
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Internal gain select |
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HP Sense |
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3 |
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7 |
19 |
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18 |
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To Control Pin on |
100KΩ |
21 |
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Headphone Jack |
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Mute |
5 |
Mode |
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20KΩ |
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4 |
Control |
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10KΩ |
|
10KΩ |
|
0.068µ F |
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Mode |
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Left Dock |
13 |
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Left |
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20KΩ |
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17 |
- Left Out |
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- |
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+ |
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Audio |
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20KΩ |
Left In |
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+ |
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Input |
12 |
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220µ F |
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- |
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Control |
Pin |
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+ |
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20KΩ |
20KΩ |
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F |
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+ |
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1KΩ |
|
Pin |
Ring |
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200KΩ |
0.33µ |
|
Beep |
|
Volume |
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Beep In |
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11 |
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- |
15 |
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Bias |
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Control |
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+ Left Out |
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Detect |
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+ |
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31 steps |
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To HP sense |
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200KΩ |
Right In |
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Right |
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+ |
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Circuit |
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10 |
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Bias |
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Audio |
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+ |
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- |
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Sleeve |
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Input |
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20KΩ |
0.33µ |
F |
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+ |
28 |
+ Right Out |
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20KΩ |
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Tip |
|||
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9 |
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- |
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Right Dock |
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Headphone Jack |
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VDD |
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20KΩ |
20KΩ |
|
- Right Out |
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6,16,27 |
|
Power |
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+ |
|
26 |
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- |
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+ |
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Management |
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1,8,14,20,23 |
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220µ F |
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|||||
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10KΩ |
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1KΩ |
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||||||
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GND |
Bypass |
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10KΩ |
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||||
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22 |
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Click and Pop |
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20KΩ |
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0.1µ F |
0.1µ F |
0.1µ |
F |
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Suppression |
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|||||
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Circuitry |
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0.068µ F |
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2.2µ |
F |
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2 |
24 |
|
25 |
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Shutdown |
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||
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20KΩ |
|
20KΩ |
|
|
|
|
|
Copyright ANPEC Electronics Corp. |
7 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
|
|
APA4838
Application Information
Volume Control Table
Gain (dB) |
|
Voltage Range (% of Vdd) |
|
Voltage Range (Vdd=5V) |
||||
|
Low |
|
High |
Recommended |
Low |
|
High |
Recommended |
|
|
|
|
|
|
|
|
|
0 |
77.5% |
|
100.00% |
100.000% |
3.875 |
|
5.000 |
5.000 |
|
|
|
|
|
|
|
|
|
-1 |
75.0% |
|
78.5% |
76.875% |
3.750 |
|
3.938 |
3.844 |
|
|
|
|
|
|
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|
-2 |
72.5% |
|
76.25% |
74.375% |
3.625 |
|
3.813 |
3.719 |
|
|
|
|
|
|
|
|
|
-3 |
70.0% |
|
73.75% |
71.875% |
3.500 |
|
3.688 |
3.594 |
|
|
|
|
|
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-4 |
67.5% |
|
71.25% |
69.375% |
3.375 |
|
3.563 |
3.469 |
|
|
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|
|
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-5 |
65.0% |
|
68.75% |
66.875% |
3.250 |
|
3.438 |
3.344 |
|
|
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|
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|
-6 |
62.5% |
|
66.25% |
64.375% |
3.125 |
|
3.313 |
3.219 |
|
|
|
|
|
|
|
|
|
-8 |
60.0% |
|
63.75% |
61.875% |
3.000 |
|
3.188 |
3.094 |
|
|
|
|
|
|
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|
-10 |
57.5% |
|
61.25% |
59.375% |
2.875 |
|
3.063 |
2.969 |
|
|
|
|
|
|
|
|
|
-12 |
55.0% |
|
58.75% |
56.875% |
2.750 |
|
2.938 |
2.844 |
|
|
|
|
|
|
|
|
|
-14 |
52.5% |
|
56.25% |
54.375% |
2.625 |
|
2.813 |
2.719 |
|
|
|
|
|
|
|
|
|
-16 |
50.0% |
|
53.75% |
51.875% |
2.500 |
|
2.688 |
2.594 |
|
|
|
|
|
|
|
|
|
-18 |
47.5% |
|
51.25% |
49.375% |
2.375 |
|
2.563 |
2.469 |
|
|
|
|
|
|
|
|
|
-20 |
45.0% |
|
48.75% |
46.875% |
2.250 |
|
2.438 |
2.344 |
|
|
|
|
|
|
|
|
|
-22 |
42.5% |
|
46.25% |
44.375% |
2.125 |
|
2.313 |
2.219 |
|
|
|
|
|
|
|
|
|
-24 |
40.0% |
|
43.75% |
41.875% |
2.000 |
|
2.188 |
2.094 |
|
|
|
|
|
|
|
|
|
-26 |
37.5% |
|
41.25% |
39.375% |
1.875 |
|
2.063 |
1.969 |
|
|
|
|
|
|
|
|
|
-28 |
35.0% |
|
38.75% |
36.875% |
1.750 |
|
1.938 |
1.844 |
|
|
|
|
|
|
|
|
|
-30 |
32.5% |
|
36.25% |
34.375% |
1.625 |
|
1.813 |
1.719 |
|
|
|
|
|
|
|
|
|
-32 |
30.0% |
|
33.75% |
31.875% |
1.500 |
|
1.688 |
1.594 |
|
|
|
|
|
|
|
|
|
-34 |
27.5% |
|
31.25% |
29.375% |
1.375 |
|
1.563 |
1.469 |
|
|
|
|
|
|
|
|
|
-36 |
25.0% |
|
28.75% |
26.875% |
1.250 |
|
1.438 |
1.344 |
|
|
|
|
|
|
|
|
|
-38 |
22.5% |
|
26.25% |
24.675% |
1.125 |
|
1.313 |
1.219 |
|
|
|
|
|
|
|
|
|
-40 |
20.0% |
|
23.75% |
21.875% |
1.000 |
|
1.188 |
1.094 |
|
|
|
|
|
|
|
|
|
-42 |
17.5% |
|
21.25% |
19.375% |
0.875 |
|
1.063 |
0.969 |
|
|
|
|
|
|
|
|
|
-44 |
15.0% |
|
18.75% |
16.875% |
0.750 |
|
0.937 |
0.844 |
|
|
|
|
|
|
|
|
|
-46 |
12.5% |
|
16.25% |
14.375% |
0.625 |
|
0.812 |
0.719 |
|
|
|
|
|
|
|
|
|
-48 |
10.0% |
|
13.75% |
11.875% |
0.500 |
|
0.687 |
0.594 |
|
|
|
|
|
|
|
|
|
-50 |
7.5% |
|
11.25% |
9.375% |
0.375 |
|
0.562 |
0.469 |
|
|
|
|
|
|
|
|
|
-52 |
5.0% |
|
8.75% |
6.875% |
0.250 |
|
0.437 |
0.344 |
|
|
|
|
|
|
|
|
|
-78 |
0.0% |
|
6.25% |
0.000% |
0.000 |
|
0.312 |
0.000 |
|
|
|
|
|
|
|
|
|
Copyright ANPEC Electronics Corp. |
8 |
www.anpec.com.tw |
Rev. A.1 - Feb., 2003 |
|
|
APA4838
Typical Characteristics
THD+N vs. Frequency
|
10 |
VDD=5V |
|
|
|
|
|
|
|
|
|
RL=3Ω |
|
|
|
|
Po=1.8W |
|
|
|
|
BTL |
|
|
(%) |
1 |
|
Av=2 |
|
|
|
|
||
|
|
|
|
|
THD+N |
|
|
Av=4 |
|
|
|
Av=8 |
|
|
0.1 |
|
|
|
|
|
|
|
|
|
|
0.01 |
|
|
|
|
20 |
100 |
1k |
20k |
Frequency (Hz)
THD+N vs. Frequency
|
10 |
VDD=5V |
|
|
|
|
|
|
|
|
|
RL=4Ω |
|
|
|
|
Po=1.5W |
|
|
|
|
BTL |
|
|
(%) |
1 |
|
|
|
|
|
|
|
|
THD+N |
|
Av=2 |
|
|
|
Av=4 |
|
|
|
0.1 |
Av=8 |
|
|
|
|
|
|
|
|
|
0.01 |
|
|
|
|
20 |
100 |
1k |
20k |
Frequency (Hz)
THD+N vs. Output Power
|
10 |
VDD=5V |
|
|
|
|
|
|
|
|
|
|
|
RL=3Ω |
|
|
|
|
|
Av=2 |
|
|
|
|
|
BTL |
|
|
|
(%) |
1 |
|
|
f=20KHz |
|
|
|
|
|
|
|
THD+N |
0.1 |
|
f=1KHz |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
f=20Hz |
|
|
|
|
0.01 |
|
|
|
|
|
10m |
100m |
1 |
3 |
|
Output Power (W)
THD+N vs. Output Power
|
10 |
|
|
|
|
VDD=5V |
|
|
|
|
RL=4Ω |
|
|
|
|
Av=2 |
|
|
|
|
BTL |
|
|
|
|
1 |
|
|
|
(%) |
f=20KHz |
|
|
|
|
|
|
|
|
THD+N |
0.1 |
|
|
|
f=1KHz |
|
|
|
|
|
|
|
|
|
|
f=20Hz |
|
|
|
|
0.01 |
|
1 |
|
|
100m |
500m |
3 |
Output Power (W)
Copyright ANPEC Electronics Corp. |
9 |
www.anpec.com.tw |
Rev. A.1 - Apr., 2003 |
|
|
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