Capless 2Vrms to 3Vrms Line Driver with Adjustable Gain TD9731
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℃.
---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
3Vrms Output Voltage into 2.5kΩ Load with 5V Supply
Home Theater in a Box
October, 20, 2011.
Techcode Semiconductor Limited