Tai-1 Microelectronics
www.taimec.com.tw / www.class-d.com.tw
Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
2.5W STEREO CLASS-D AUDIO POWER AMPLIFIER WITH VOLUME CONTROL GENERAL DESCRIPTION
The TMPA208DS is a stereo class-D audio power amplifier with volume control. It delivers up to 2.5W/ch(5W in all) into a 3 ohm load or 2W/ch(4W in all) into a 4 ohm load or 1.25W/ch(2.5W in all) into an 8 ohm load. With differential input structure, TMPA208DS features high Common Mode Rejection Ratio and Power Supply Rejection Ratio. Analog input signal is converted into digital output which drives directly to the speaker. High power efficiency is achieved due to digital output at the load. The audio information is embedded in PWM（Pulse Width Modulation）. DC volume control is convenient for LCD
FEATURES
♦2.5V to 6V Single Supply ♦Up to 5Wrms Max. Power or 2.5Wrms/ch. ♦Up to 86% Power Efficiency ♦3mA /Ch Quiescent Current ♦Less Than 0.2uA /Ch Shutdown Current ♦Pop-less Power-Up, Shutdown and Recovery ♦Differential 230 KHz PWM Allows Bridge-Tied Load to Increase Output Power ♦DC Volume Control ♦BTL Output Requires No Output Capacitors ♦Thermal Shutoff and Automatic Recovery ♦Output Pin Short-Circuit Protection (Short to Other Outputs, Short to VCC, Short to Ground) ♦Compatible with earphone application ♦Differential Signal Processing Improves CMRR &
projectors, LCD monitors, powered speakers, and other consumer products especially when using remote control.
APPLICATIONS
Multimedia application includes Cellular Phones, PDAs, DVD/CD players, TFT LCD TVs/Monitors, LCD Projectors, 2.1 channel audio systems, Powered Speakers, USB audio. It is also ideal for other portable devices like Wireless Radios.
Eliminates Power Regulation ♦Package：TSSOP20 Available
For best performance, please refer to
http://www.taimec.com.tw/English/EVM.htm http://www.class-d.com.tw/English/EVM.htm
for PCB layout.
Tai-1 Microelectronics Corp. reserves the right to make changes to its products and services and to discontinue any product or service without notice. Customers should obtain the latest relevant information for reference. Testing and quality control techniques are used to screen the parameters. Testing of all parameters of each product is not necessarily performed.
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Tai-1 Microelectronics
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
REFERENCE CIRCUIT（Please refer to TMPA002.APP for application）
TOP VIEW
（Please email david@taimec.com.tw for complete datasheet.）
Tai-1 Microelectronics reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers are responsible for their products and applications using Tai-1 Microelectronics components.
Note that the external components or PCB layout should be designed not to generate abnormal voltages to the chip to prevent from latch up which may cause damage to the device.
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
Typical Application
J1 PHONEJACK STEREO
R10 0k
LIN+ R4 100 R7 5k R6 C11 1uF LOUT+ L1 33u C1 1uF VDD LOUTL2 C14 1uF 33u 5k SDN R1 10k C7 C15 1nF C8 1uF 1uF J2 1 LINN RINN 20 2 LINP RINP 19 3 SDNB BYPASS 18 PVDDLPVDDR 4 17 5 LOUTP ROUTP 16 6 PGNDLPGNDR 15 LOUTNROUTN 7 14 8 PVDDLPVDDR 13 9 NC VOLUME 12 AGND AVDD 10 11 TMPA208DS + C2 C5 470uF 1uF C9 1uF C10 1uF R8 C16 1nF R9 5k R5 100
RIN+
5k
C12 1uF L3 C3 1uF R12 33u ROUT+ ROUT-
switch S1
C4 1uF
C6 470uF
VDD L4 VOLUME
33u C13 1uF
TERMINAL FUNCTIONS
TERMINAL I/O NAME AGND BYPASS LINN LINP LOUTN LOUTP NC PGNDL PGNDR PVDDL PVDDR RINN RINP ROUTN ROUTP SDNB AVDD VOLUME PIN NO 10 18 1 2 7 5 9 6 15 4,8 13,17 20 19 14 16 3 11 12 － O I I O O － － － － － I I O O I － I Analog ground Bypass Negative differential input for left channel Positive differential input for left channel Negative output for left channel Positive output for left channel N o connection Ground for left channel H-bridge Ground for right channel H-bridge Power supply for left channel H-bridge Power supply for right channel H-bridge Negative differential input for right channel Positive differential input for right channel Negative output for right channel Positive output for right channel Places the amplifier in shutdown mode if a TTL logic low is placed on this terminal; normal operation if a TTL logic high is placed on this terminal Analog power supply DC Volume control DESCRIPTION
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+
AVDD R2 50k
33k
R3 100
VDD
3
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
ABSOLUTE MAXIMUM RATINGS
O ver operating free-air temperature range unless otherwise noted Supply voltage range, VDD, PVDD Input voltage range, V I C ontinuous total power dissipation Operating free-air temperature, TA Operating junction temperature range, TJ Storage temperature range, Tstg
(1)
0.3V to 6V 0V to 5.5V See Dissipation Rating Table -20。C to 85。C -20。C to 150。C -65。C to 150。C
(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.
DISSIPATION RATINGS TABLE
PACKAGE TSSOP20(FD) TA≤25。 C 2.18W DERATING FACTOR 21.8mW/ C
。
TA=70。 C 1.2W
TA=85。C 872mW
RECOMMENDED OPERATING CONDITIONS
M IN Supply voltage, VDD High-level input voltage, V IH Low-level input voltage, V IL PWM frequency Operating free-air temperature, TA Operating junction temperature, TJ SDNB SDNB 200 -20 -20 2.5 2 0.8 300 85 125 TYP MAX 6 UNIT V V V KHz
。 。
C
C
ELECTRICAL CHARACTERISTICS
T A=25。 , VDD=PVDD=5V (unless otherwise noted) C
PARAMETER ｜ VOS｜ PSSR │ IIH│ │ IIL│ IDD IDD（ SD） rds（ on） Av Ri Power supply rejection ratio High-level input current Low-level input current Supply current Supply current in shutdown mode Drain-source on-state resistance Voltage gain Input resistance TEST CONDITIONS VDD=PVDD=3.5V to 5.5V VDD=AVDD=5.5V, VI=5.8V (SDNB) VDD=AVDD=5.5V, VI=-0.3V (SDNB) No load SDNB=0V VDD=5V, IO=500mA, TJ=25。C VOLUME=2.8V~0V High side Low side 24 6 50 450 450 18 200 MIN TYP 25 -70 30 1 10 1000 600 600 MAX 50 UNIT mV dB μA μA mA nA mΩ dB kΩ Output offset voltage（ measured differentially） VI=0V, AV=20dB, RL=8Ω
RL=8Ω, VOLUME=2.8V
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
OPERATING CHARACTERISTICS
T A=25。 , VDD=PVDD=5V, RL=8Ω speaker, Gain=18dB (unless otherwise noted) C
PARAMETER PO THD+N Output power per channel (Limited by thermal condition) Total harmonic distortion plus noise Thermal trip point Thermal hysteresis Vn SNR Crosstalk Integrated noise floor Signal-to-noise ratio Crosstalk between outputs 20 Hz to 20 kHz, inputs ac grounded VDD=AVDD=5V, PO=1W, RL=8Ω VDD=AVDD=5V, PO=1W RL=8Ω TEST CONDITIONS f=1kHz, RL =3Ω, stereo operation f=1kHz, RL =4Ω, stereo operation f=1kHz, RL =8Ω, stereo operation RL =8Ω, PO=1.2W, f=1kHz MIN TYP 2.5 2 1.25 0.4％ 150 20 85 95 -68
。 。
MAX
UNIT W W W
C
C
µVrms dB dB
VOLTAGE RANGE OF “VOLUME” AT DIFFERENT VDD
VDD 5V 3.6V 3V MAX 2.8V 1.9V 1.3V MIN 0V 0V 0V
VOLTAGE GAIN AT TA=25。 , RL=8Ω C
VDD=PVDD=5V 5V 3.6V 3V VOLTAGE GAIN 18dB/-27dB 18dB/-27dB 16dB/-27dB VOLTAGE of VOLUME 2.8V/0V 1.9V/0V 1.4V/0V
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
Table 1. TYPICAL DC VOLUME CONTROL VOLTAGE ON VOLUME PIN (V) 0-0.1 0.1-0.19 0.19-0.29 0.29-0.39 0.39-0.48 0.48-0.58 0.58-0.68 0.68-0.77 0.77-0.87 0.87-0.97 0.97-1.06 1.06-1.16 1.16-1.26 1.26-1.35 1.35-1.45 1.45-1.55 1.55-1.64 1.64-1.74 1.74-1.84 1.84-1.93 1.93-2.03 2.03-2.13 2.13-2.22 2.22-2.32 2.32-2.42 2.42-2.51 2.51-2.61 2.61-2.71 2.71-2.8 2.8-2.9 2.9-VDD *Not fully tested but guaranteed by design. **This table is only for VDD=5V TYPICAL GAIN OF AMPLIFIER (dB) -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 —
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
Physical Dimensions
(IN MILLIMETERS)
±
7.72 TYP 4.16 TYP
(1.78 TYP)
0.42 TYP 0.65 TYP
LAND PATTERN
TSSOP20
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Preliminary
TMPA208DS
R ev.1.0 June 27, 2006
IMPORTANT NOTICE
Tai-1 Microelectronics Corp. reserves the right to make changes to its products and services and to discontinue any product or service without notice. Customers should obtain the latest relevant information for reference. Testing and quality control techniques are used to screen the parameters. Testing of all parameters of each product is not necessarily performed.
Tai-1 Microelectronics Corp. assumes no liability for applications assistance or customer product design. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.
Reproduction of information in data sheets or related documentation is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Tai-1 Microelectronics Corp. is not responsible or liable for such altered documentation.
Resale of Tai-1 Microelectronics Corp. products or services with statements different from the parameters stated by Tai-1 Microelectronics Corp. for that product or service voids all express and any implied warranties. Tai-1 Microelectronics Corp. is not responsible or liable for any such statements.
Copyright ©2005,Tai-1 Microelectronics Corp.
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