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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
General Description
Features
The TD9731 is a 2Vrms to 3Vrms Pop&Click-less stereo line driver designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single supply electronics where size and cost are critical design parameters. The TD9731 is capable of driving 3Vrms into a 2.5kΩ load with 5V supply voltage. The device has single input and uses external gain setting resistors, that supports a gain range of ±1V/V to ±10V/V. The use of external gain resistors also allows the implementation of a 2nd order low pass filter to compliment DAC's and SOC converters. The TD9731 has build-in shutdown control for Pop&Click-free on/off control. Using the TD9731 in audio products can reduce component count compared to traditional methods of generating a 3Vrms output. The TD9731 doesn't require a power supply greater than 5V to generate its 8.5VPP output, nor does it require a split rail power supply. The TD9731 integrates its own charge pump to generate a negative supply rail that provides a clean, pop&click-less ground biased 3Vrms output. The TD9731 is available in Green MSOP-10 (Exposed Pad) package. It operates over an ambient temperature range of -40℃ to +85℃.
Capless Structure ---Eliminates Pop/Clicks ---Eliminates Output DC-Blocking Capacitors ---Provides Flat Frequency Response DC to 20kHz Low Noise and THD ---Typical SNR = 107dB ---Typical VN = 8μVrms ---Typical THD+N = 0.001% (f = 1kHz) 2Vrms Output Voltage into 2.5kΩ Load with 3.3V Supply
Voltage 3Vrms Output Voltage into 2.5kΩ Load with 5V Supply
Voltage
Applications
Set-Top Box LCD TV Blue-Ray DVD-Players Home Theater in a Box
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Pin Configurations
MSOP-10 (Top View)
Pin Description
NO. NAME FUNCTION
1 -INR Right channel OPAMP negative input
2 OUTR Right channel OPAMP output
3 EN
Enable input, active high
4 PVSS Negative supply voltage output
5 CN
Charge pump flying capacitor negative terminal
6 CP
Charge pump flying capacitor positive terminal
7 PVDD Positive supply
8 UVP Undervoltage protection input
9 OUTL Left channel OPAMP output
10 -INL Left channel OPAMP negative input
-- EP
Exposed Paddle. Can only be connected to GND.
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Ordering Information
TD9731
□□
Circuit Type P:MSOP-10
Packing: Blank:Tube R:Type and Reel
Functional Block Diagram
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Absolute Maximum Ratings
N Note1: 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 rating conditions for extended periods may affect device reliability.
Recommended Operating Conditions
Thermal Characteristics
Note 2: Please refer to “Thermal Pad Consideration”. 2 layered 5 in2 printed circuit boards with 2oz trace and copper through several thermal vias. The thermal pad is soldered on the PCB.
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Electrical Characteristics
VDD=3.3V, VGND=VPGND=0V, VSDN=VDD, CCPF=CCPO=1F, Ci=1F, RL=2.5k, TA=25oC, Ri=10k, Rf=20k(unless otherwise noted)
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Typical Operating Characteristics
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Typical Operating Characteristics(Cont.)
October, 20, 2011.
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Typical Operating Characteristics(Cont.)
October, 20, 2011.
Techcode Semiconductor Limited 8
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Typical Operating Characteristics(Cont.)
October, 20, 2011.
Techcode Semiconductor Limited 9
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Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
Typical Operating Characteristics(Cont.)
October, 20, 2011.
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