TPS65190 Datasheet, PDF (10/18 Pages) Texas Instruments – 10-Channel Level Shifter and VCOM Buffer

TPS65190
SLVS881 – SEPTEMBER 2009.......................................................................................................................................................................................... www.ti.com
DETAILED DESCRIPTION
The TPS65190 contains 10 level shifter channels and one high-speed operational amplifier.
The 10 level shifter channels are organized in two groups: the first group, comprising channels 1-6 and 9-10 is
powered from V_VGH1 and V_GL; the second group, comprising channels 7 and 8 is powered from V_GH2 and V_GL.
Channels 1 to 8 are optimized for high speed operation while channels 9 and 10 operate a little slower.
All level shifter channels feature the same input circuitry and are compatible with the standard logic-level signals
generated by timing controllers in typical applications. The output circuitry has been designed to achieve high
rise and fall times when driving the capacitive loads typically encountered in LCD display applications
The input and output stages of the operational amplifier extend close to both supply rails and the output stage
has been optimized to supply the fast transient currents typical in V_COM applications.
APPLICATION INFORMATION
It is recommended to use high quality ceramic capacitors to decouple each supply pin. In typical applications 10
µF is recommended for V_GH1 and V_GL, while 1 µF is normally sufficient for V_GH2.
Use level shifter channels 1 to 8 for high-speed clock signals and use channels 9 to 10 for lower-speed signals
(see Figure 14). The inputs of any unused level shifter channels should be tied to GND. The outputs of any
unused level shifter channels should be left floating.
It is recommended to use low-value feedback resistors with the VCOM buffer to minimize the effects of stray
capacitance at its inverting input. Using high value feedback resistors can cause excessive peaking in the
amplifier’s gain response (caused by pole formed by the feedback resistor and the stray capacitance). If the
VCOM buffer is used in a unity gain configuration, the flattest gain response is achieved using a direct
connection between the amplifier's output and inverting input.
If the VCOM buffer is not used, tie AVDD, its inverting and non-inverting inputs, and its output to GND.
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