APA4835
Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain
Features
•Operating Voltage : 3.3V to 5V
•Stereo switchable bridged/single-ended power amplifiers
•DC Volume Control Interface , 0dB to –105dB
•Low Supply Current , IDD = 13mA 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
–2.2W/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
•Depop Circuitry Integrated
•System Beep Detect
•Thermal shutdown protection circuitry
•High supply voltage ripple rejection
•Low Crossover Distortion
•PC99 Compliant
•28-pin TSSOP-P (with enhanced thermal pad) power package available
Applications
•Notebook and Desktop Computers
•Multimedia Monitors
•Portable Applications
General Description
The APA4835 is a monolithic integrated circuit , which provides DC volume control , and a stereo bridged audio power amplifiers capable of producing 2.8W (2.2W) into 3Ω with less than 10% (1.0%) THD+N. APA4835 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 APA4835 is from 0dB (DC_Vol=0.7VDD) to –105dB (DC_Vol=0V) with 32 steps. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA4835 , 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 , APA4835 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 SE/BTL input control pin signal. Besides the low supply current design to increase the efficiency of the amplifiers , APA4835 also features a shutdown function which keeps the supply current only 0.7µA (typ).
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.7 - Mar., 2003 |
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APA4835
Ordering Information
A P A 4835 |
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P ac kag e C o de |
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R : T S S O P -P |
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H an dling C o de |
T em p . R a ng e |
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I : -4 0 to 8 5 ° |
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T em p . R a ng e |
H an dling C o de |
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P ac kag e C o de |
T U : T u be |
T R : T ap e & R e el |
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A P A 4 83 5 R : |
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A P A 4 83 5 |
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X X X X X - D a te C od e |
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Block Diagram
Internal gain select |
20KΩ |
20KΩ |
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Mode |
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Mode |
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Mute |
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Control |
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20KΩ |
0.068µ F |
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HP Sense |
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DC Vol Control |
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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 In |
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20KΩ |
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- |
20KΩ |
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200KΩ |
0.33µ F |
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+ |
Volume |
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Beep In |
Beep |
Bias |
- |
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Control |
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Detect |
+ Left Out |
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200KΩ |
0.33µ F |
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32 steps |
+ |
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+ |
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Right In |
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- |
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+ Right Out |
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20KΩ |
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- |
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Right Dock |
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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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GND |
Management |
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 |
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Circuitry |
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20KΩ |
20KΩ |
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Absolute Maximum Ratings
(Over operating free-air temperature range unless otherwise noted.)
Symbol |
Parameter |
Rating |
Unit |
VDD |
Supply Voltage |
6 |
V |
TA |
Operating Ambient Temperature Range |
-40 to 85 |
° C |
TJ |
Maximum Junction Temperature |
Internally limited*1 |
° C |
TSTG |
Storage Temperature Range |
-65 to +150 |
° C |
TS |
Soldering Temperature,10 seconds |
260 |
° C |
VESD |
Electrostatic Discharge |
-2000 to 2000*2 |
V |
Note :*1. APA4835 integrates internal thermal shutdown protection when junction temperature ramp up to 150°C. *2. Human body model : C=100pF, R=1500Ω , 3 positive pulses plus 3 negative pulses
Copyright ANPEC Electronics Corp. |
2 |
www.anpec.com.tw |
Rev. A.7 - Mar., 2003 |
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APA4835
Thermal Characteristics
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Symbol |
Parameter |
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Rating |
Unit |
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RTHJA |
Thermal Resistance from Junction to Ambient in Free Air |
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TSSOP-P* |
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°C/W |
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TSSOP-P** |
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35 |
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*5in2 printed circuit board with 2oz trace and copper pad through 12 25mil diameter vias. The |
thermal pad on the TSSOP_P package |
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without solder on the printed circuit board. |
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**5in2 printed circuit board with 2oz trace and copper pad through 12 25mil diameter vias. The thermal pad on the TSSOP_P package with solder on the printed circuit board.
Electical 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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APA4835 |
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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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3.3 |
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5.5 |
V |
IDD |
Quiescent Power Supply |
VIN=0V, IO=0A |
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13 |
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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 |
VIH |
SE/BTL High Input Voltage |
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4 |
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V |
VIL |
SE/BTL Low Input Voltage |
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0.8 |
V |
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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APA4835 |
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Unit |
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Min. |
Typ. |
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Max. |
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CRANGE |
Attenuator Range |
Gain with VPIN 7=5V |
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±0.5 |
dB |
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Attenuation with VPIN 7=0V |
-90 |
-105 |
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AM |
Mute Attenuation |
VPIN 5=5V, Bridged Mode |
-88 |
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dB |
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VPIN 5=5V, Single-Ended Mode |
-88 |
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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 |
APA4835 |
Unit |
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Typ. |
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VOS |
Output Offset Voltage |
VIN=0V |
5 |
mV |
PO |
Output Power |
THD=1%, f=1kHz |
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RL=3Ω |
2.2 |
W |
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RL=4Ω |
2.0 |
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RL=8Ω |
1.2 |
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THD=10%, f=1kHz |
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RL=8Ω |
1.5 |
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Copyright ANPEC Electronics Corp. |
3 |
www.anpec.com.tw |
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Rev. A.7 - Mar., 2003 |
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APA4835
Electical Characteristics (Cont.)
Electrical Characteristics for BTL Mode Operation (Cont.)
The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C
Symbol |
Parameter |
Test Conditions |
APA4835 |
Unit |
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Typ. |
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THD+N |
Total Harmonic Distortion + Noise |
AVD=2, 20Hz<f<20kHz |
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RL=4Ω , PO =1W |
0.2 |
% |
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RL=8Ω , PO=1W |
0.15 |
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RL=32Ω , PO =340mW |
0.1 |
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PSRR |
Power Supply Rejection Ratio |
VRIPPLE=200mVRms , RL=8Ω |
74 |
dB |
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CB=2.2µ F, f=120Hz |
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XTALK |
Channel Separation |
f=1kHz , CB=2.2µ F |
95 |
dB |
SNR |
Signal-to-Noise Ratio |
VDD=5V, PO =1.1W, RL=8Ω ,A-Wtd |
95 |
dB |
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Filter |
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VN |
Output Noise Voltage |
RL=8Ω ,A-Wtd Filter |
30 |
uV |
Electrical Characteristics for SE Mode Operation
The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C
Symbol |
Parameter |
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Test Conditions |
APA4835 |
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, |
RL=32Ω |
95 |
mW |
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THD=10%, |
f=1kHz, |
RL=32Ω |
100 |
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THD+N |
Total Harmonic Distortion |
AV= 1 , VOUT=1VRMS, f=1kHz, RL=1kΩ |
0.01 |
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plus Noise |
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PO =75mW, RL=32Ω , AV= 1, f=1kHz |
0.005 |
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PSRR |
Power Supply Rejection |
VRIPPLE=200mVRMS , f=120Hz, CB=2.2µ F |
58 |
dB |
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Ratio |
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XTALK |
Channel Separation |
f=1kHz , CB=2.2µ F |
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95 |
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=1kΩ , A-Wtd Filter |
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40 |
uV |
Pin Description
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Pin |
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, 20, |
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Ground connection for circuitry. |
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23 |
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Shutdown |
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2 |
I |
Shutdown mode control signal input, place entire IC in shutdown mode when held high, Idd=0.7uA |
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Gain Select |
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3 |
I |
Gain select input pin |
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Mode |
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4 |
I |
Mode select input pin |
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Mute |
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5 |
I |
Mute control input pin |
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Copyright |
ANPEC Electronics Corp. |
4 |
www.anpec.com.tw |
Rev. A.7 - Mar., 2003
APA4835
Pin Description
Pin |
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I/O |
Description |
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Name |
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No |
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VDD |
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6, 16, 27 |
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Supply voltage input pin |
DC_Vol |
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7 |
I |
Volume control function input pin. |
Right Dock |
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9 |
O |
Right docking output pin |
Right In |
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10 |
I |
Right channel audio input pin |
Beep In |
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11 |
I |
Beep signal input pin |
Left In |
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12 |
I |
Left channel audio input pin |
Left Dock |
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13 |
O |
Right docking output pin |
Left Out + |
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15 |
O |
Left channel positive output pin |
Left Out - |
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17 |
O |
Left channel negative output pin |
Left Gain 2 |
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18 |
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Connect pin 2 of the external gain setting resistor for left channel |
Left Gain 1 |
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19 |
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Connect pin 1 of the external gain setting resistor for left channel |
HP Sense |
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21 |
I |
Headphone sense control pin |
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 |
Mode |
HP Sense |
DC Vol. Control |
Bridged Output |
Single-Ended |
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0 |
0 |
0 |
Fixed Level |
Vol. Fixed |
- |
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0 |
0 |
1 |
Fixed Level |
Muted |
Vol. Fixed |
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0 |
1 |
0 |
Adjusted |
Vol. Changes |
- |
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0 |
1 |
1 |
Adjusted |
Muted |
Vol. Changed |
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1 |
× |
× |
- |
Muted |
Muted |
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Copyright ANPEC Electronics Corp. |
5 |
www.anpec.com.tw |
Rev. A.7 - Mar., 2003 |
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APA4835 |
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Typical Application Circuit |
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VDD |
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VD D |
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1 |
µ |
F |
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R_var |
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DC Vol Control |
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r*=R_var/50 |
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VDD |
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20KΩ |
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20KΩ |
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100K |
Ω |
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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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100KΩ |
21 |
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To Control Pin on |
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Headphone Jack |
Mute |
5 |
Mode |
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20KΩ |
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4 |
Control |
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10KΩ |
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10KΩ |
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0.068µ F |
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Mode |
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Left Dock |
13 |
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20KΩ |
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17 |
- Left Out |
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+ |
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Left In |
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20KΩ |
12 |
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+ |
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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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Ω |
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+ |
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1K |
Pin |
Ring |
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200KΩ |
0.33µ |
F |
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Beep |
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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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32 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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Audio |
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+ |
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- |
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Sleeve |
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Input |
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 |
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- Right Out |
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6,16,27 |
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Power |
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+ |
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26 |
+ |
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- |
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Managem ent |
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1,8,14,20,23 |
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220µ F |
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10KΩ |
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1KΩ |
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GND |
Bypass |
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10KΩ |
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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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Circuitry |
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0.068µ F |
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2 .2 µ |
F |
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2 |
24 |
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25 |
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Shutdown |
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20KΩ |
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20KΩ |
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* Add a resistor to avoid volume control gain error at power on status. For the R_var with 10KΩ variable resistor, the recommended value of r is in range of 100~200Ω .
Copyright ANPEC Electronics Corp. |
6 |
www.anpec.com.tw |
Rev. A.7 - Mar., 2003 |
|
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APA4835
Typical Characteristics
(%) |
10 |
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Distortion+Noise |
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5 |
VDD=5V |
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RL=3Ω |
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2 |
Po=1.75W |
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BTL |
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1 |
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0.5 |
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Harmonic |
0.2 |
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0.1 |
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0.05 |
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THD+N-Total |
0.02 |
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0.01 |
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20 |
50 |
100 |
200 |
500 |
1k |
2k |
5k |
10k |
20k |
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Frequency (Hz)
(%) |
10 |
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Distortion+Noise |
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5 |
VDD=5V |
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RL=8Ω |
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2 |
Po=1.0W |
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BTL |
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1 |
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0.5 |
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Harmonic |
0.2 |
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0.1 |
AV=8 |
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AV=2 |
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0.05 |
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THD+N-Total |
0.02 |
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AV=4 |
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0.01 |
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20 |
50 |
100 |
200 |
500 |
1k |
2k |
5k |
10k |
20k |
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Frequency (Hz)
(%) |
10 |
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Distortion+Noise |
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5 |
VDD=5V |
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RL=4Ω |
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2 |
Po=1.5W |
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BTL |
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1 |
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0.5 |
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Harmonic |
0.2 |
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0.1 |
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0.05 |
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THD+N-Total |
0.02 |
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0.01 |
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20 |
50 |
100 |
200 |
500 |
1k |
2k |
5k |
10k |
20k |
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Frequency (Hz)
(%) |
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Distortion+Noise |
5 |
VDD=5V |
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RL=16Ω |
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2 |
Po=0.5W |
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|
BTL |
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1 |
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0.5 |
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Harmonic |
0.2 |
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0.1 |
|
AV=4 |
AV=2 |
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|||
0.05 |
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|
THD+N-Total |
0.02 |
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AV=8 |
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||
0.01 |
|
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|
20 |
50 |
100 |
200 |
500 |
1k |
2k |
5k |
10k |
20k |
|
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|
|
Frequency (Hz)
Copyright ANPEC Electronics Corp. |
7 |
www.anpec.com.tw |
Rev. A.7 - Mar., 2003 |
|
|