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THREE-CHANNEL AUDIO AMPLIFIER
DESCRIPTION
SD7402 is a 3-channel audio amplifier with built-in microphone input amplifier. High quality audio output is available through simple peripheral circuit and the amplifier gain can be adjusted flexibly by external resistor. Its audio output signal-noise ratio is 85dB, total harmonic distortion is 0.05% and the channel separation is 78dB. Based on BICMOS technology, SD7402 can stably work in +5V/12V system with built-in voltage regulator. The built-in filter can improve the audio quality by attenuating the other signals. The mute and ON/OFF POP suppression functions can suppress the POP noise in the input signal. It is widely used as pre-amplification in various stereo and 2.1channel audio systems to pre-amplify the signal from the main chip audio.
SOP-16-225-1.27
APPLICATIONS FEATURES
* BICMOS technology * Dual power supply (+5V/-12V) * Built-in voltage regulator * Low distortion * Standby function * Mute function and ON/OFF POP noise suppression * CD/VCD/DVD * Other audio systems
ORDERING INFORMATION
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Part No. SD7402 SD7402TR
Package SOP-16-225-1.27 SOP-16-225-1.27
Marking SD7402 SD7402
Material Pb free Pb free
Package Type Tube Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2009.11.11 Page 1 of 7
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Characteristics
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Symbol VCC/VSS Topr Tstg
Rating +6/-1
Unit V C C
Supply Voltage (VCC/Vss) Operating Temperature Storage Temperature
-20~85 -40~125
Note 1: Tolerable voltage is decided by external resistor because of built-in voltage regulator at negative power supply.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.0
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ELECTRICAL CHARACTERISTIC (Unless otherwise specified, VCC = 5V, VSS = -12V, RL = 10k, Tamb =
25C, f = 1kHz) Characteristics Operating Voltage Symbol VCC VSS ICC Operating Current Standby Current Max. Output Voltage Audio Amplitude Response Change Voltage Gain Total Harmonic Distortion Signal-Noise Ratio Dynamic Range Mute Restrain Channel Separation Channel Balance Input Impedance G THD SNR DR MR CT CB Ri ISS ISTBY Vomax External resistor 470 at negative power supply STBY_N connect toVSS THD=0.1% 20Hz~20kHz, Vo=2Vrms No input resistor, THD=0.1% Vo=2Vrms Vo=2Vrms -60dB Vo=2Vrms Vo=2Vrms Vo=2Vrms Test Condition Min. -----2.3 ---80 80 75 75 --Typ. 5 -12 3 14.8 600 2.5 -11.8 0.05 85 89 80 78 -26 Max. --5 16 800 -1 -0.1 ----0.2 -Unit V V mA mA A Vrms dB dB % dB dB dB dB dB
PIN CONFIGURATION
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HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name VCC PMUTE MIC IN MUTE L IN R IN SUB IN NC NC SUB OUT R OUT L OUT MIC OUT STBY_N VSS GND I/O -I/O I I I I I --O O O O I --Pin Description Positive power supply POP restrain control Microphone input Mute control Left channel input Right channel input Subwoofer input no connection no connection Subwoofer output Right channel output Left channel output Microphone output Standby control Negative power supply Ground
FUNCTION DESCRIPTION
1. Channel amplifier
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The second-order filter structure shown as above is adopted for 3-channel audio amplifier, with in-band gain of about 12dB and -3dB bandwidth of 40kHz above which is well meet audio requirements. As principle structure, in-band gain is decided by: G = - R 2 , thus, gain can be adjusted by changing R1.
R1
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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2.
Microphone amplifier
The proportional amplifier shown as above is adopted for microphone amplifier with setting gain of about 29dB, and capacitor C is used for high frequency signal filtering. As described above, the gain can be also adjusted by changing R1. 3. Mute & ON/OFF POP noise control
Mute control pin (pin 4) controls 3-channel as mute by internal switches. It comes to mute mode when pin 4 is connected to Vcc (high level) and comes to normal mode when connected to ground. Pin 2 is used for POP noise restrain by connecting an external capacitor which can be increased appropriately for better POP noises restrain effect. In general, POP noise restrain is realized by mute control. Mute pulse is generated when turned on for zero output and ended after powered on for normal output; mute pulse is also generated when power supply is threshold value below during turned off for zero output. Thus, pop noise is restrained during power on/down. 4. Power supply
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The built-in voltage regulator for negative power supply is shown as below. An external resistor R guarantees voltage stability near -5V on pin 15 and the chip power supply is 5V for normal operation. Because the negative power to provide current is decided by this resistance, if the system output is light load, this resistance can be properly increased to reduce operate current, but the voltage of pin 15 must be maintained and can not drop significantly.
5.
System standby
The pin STBY_N controls system entering standby mode by turning off internal amplifier bias circuit. When this pin is connected to Vss, system enters standby mode, and when floated, system works normally. Note: internal voltage regulating circuit still works in standby mode and supplies working current.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
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2009.11.11 Page 5 of 7
TYPICAL APPLICATION CIRCUIT
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HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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PACKAGE OUTLINE
SOP-16-225-1.27 UNIT: mm
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MOS DEVICES OPERATE NOTES:
Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: The operator must put on wrist strap which should be earthed to against electrostatic. Equipment cases should be earthed. All tools used during assembly, including soldering tools and solder baths, must be earthed. MOS devices should be packed in antistatic/conductive containers for transportation.
Disclaimer: * Silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! Customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current. * All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products could cause loss of body injury or damage to property. * Silan will supply the best possible product for customers!
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2009.11.11 Page 7 of 7
5.720.25
6.00.4
3.90.3

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