AS19-G データシートの表示（PDF） - Unspecified
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AS19-G Datasheet PDF : 12 Pages
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18+1 Channel Voltage Buffers for TFT LCD
EC5579
Applications Information
Product Description
The EC5579 rail-to-rail quad channels amplifier is built on an advanced high voltage CMOS process. It’s beyond
rails input capability and full swing of output range made itself an ideal amplifier for use in a wide range of
general-purpose applications. The features of 1µS high slew rate, fast settling time, 2MHz of GBWP as well as high
output driving capability have proven the EC5579 a good voltage reference buffer in TFT-LCD for grayscale
reference applications. High phase margin and extremely low power consumption (500µA per amplifier) make the
EC5579 ideal for Connected in voltage follower mode for low power high drive applications
Supply Voltage, Input Range and Output Swing
The EC5579 can be operated with a single nominal wide supply voltage ranging from 6.5V to 18V with stable
performance over operating temperatures of -20 °C to +85 °C.
With 500mV greater than rail-to-rail input common mode voltage range and 75dB of Common Mode Rejection Ratio,
the EC5579 allows a wide range sensing among many applications without having any concerns over exceeding the
range and no compromise in accuracy. The output swings of the EC5579 typically extend to within 80mV of positive
and negative supply rails with load currents of 5mA. The output voltage swing can be even closer to the supply rails
by merely decreasing the load current. Figure 1 shows the input and output waveforms for the device in the
unity-gain configuration. The amplifier is operated under ±5V supply with a 10k. load connected to GND. The input is
a 10Vp-p sinusoid. An approximately 9.985 Vp-p of output voltage swing can be easily achieved.
Figure10. Operation with Rail-to-Rail Input and Output
Output Short Circuit Current Limit
A +/-120mA short circuit current will be limited by the EC5579 if the output is directly shorted to the positive
or the negative supply. For an indefinitely output short circuit, the power dissipation could easily increase such that
the device may be damaged. The internal metal interconnections are well designed to prevent the output continuous
current from exceeding +/-30 mA such that the maximum reliability can be well maintained.
E-CMOS Corp. (www.ecmos.com.tw)
Page 7 of 12
2007/06/29
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