Datenblatt-Suchmaschine für elektronische Bauteile |
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ADD8754-EVAL Datenblatt(PDF) 6 Page - Analog Devices |
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ADD8754-EVAL Datenblatt(HTML) 6 Page - Analog Devices |
6 / 12 page ADD8754-EVAL Rev. A | Page 6 of 12 Setting VDD_1 The VDD_1 voltage is the GPM low ramp voltage. With R25 shorted and RZ open, the step-up output (BOOST_OUT) is connected to VDD_1. This ramps the GPM_H waveform down to the BOOST_OUT voltage level. If other voltages are desired, a voltage divider or Zener diode can be used to set this voltage. If a voltage divider is used, a low divider impedance (<1 kΩ) is recommended. See the ADD8754 data sheet for more information. Adjusting the Delay and Ramp Rate Capacitor CE adjusts the negative ramp delay of the VGH_M waveform. RE adjusts the negative ramp rate of the VGH_M waveform. See the ADD8754 data sheet for details. VFLK Input The amplitude of the input signal on VFLK must be between 2.5 V to 5.0 V. Typically, VFLK is a digital waveform that switches from high to low for each horizontal line of the TFT-LCD display (from TCON). If a signal generator is used, the following settings are recommended to simulate a 1280 × 1024 60 Hz panel: • Digital pulse signal • 3.3 V amplitude (low = 0 V, high = 3.3 V) • 16 μs period • 30% duty cycle AD5259 DIGITAL POTENTIOMETER (OPTIONAL) If the ADD8754-EVAL includes an optional AD5259 digital potentiometer, the VCOM output voltage is set by using Resistor R3, Resistor R4 and the programmed output resis- tance of the 10 kΩ digital potentiometer, AD5259. Set the components as shown in Table 3. Table 3. AD5259 Component Differences Label Description Value C13 VCOM feedback capacitor Open C23 AD5259 VDD bypass capacitor Open R12 Variable resistor for VCOM positive input 10 kΩ R13 VCOM feedback resistor Open R21 VCOM negative input resistor Open R22, R23 AD5259 digital control pull-up resistor Open R24 VCOM positive input divider resistor (top) 15 kΩ R_SCA, R_SCL AD5259 digital control series resistors Open To use the programmable potentiometer 1. Connect the ADD8754-EVAL to the parallel port of a PC using a parallel port cable. 2. Insert the CD from the evaluation kit into the CD drive and click setup.exe to install the software. 3. Once installation is complete, open the AD5259 Evaluation Board Program from the Start menu. 4. Enter data in the Enter Data text box and then click Write to RDAC to write the data. 5. Click the Store RDAC Content to EEMEM button to store the current RDAC setting to EEMEM. Note that because the AD5259 is a low voltage part (supply from LDO_OUT), the appropriate VCOM gain resistors must be configured to raise the VCOM output voltage. If Resistor R13 and Resistor R21 are set to the values listed in Table 3, the gain is set to +3. For more information, see the AD5259 Evaluation Board User Manual on the ADD8754 Evaluation Kit CD. |
Ähnliche Teilenummer - ADD8754-EVAL |
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Ähnliche Beschreibung - ADD8754-EVAL |
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