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AD8385 Datasheet(PDF) 20 Page - Analog Devices |
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AD8385 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 24 page  AD8385 Rev. 0 | Page 20 of 24 Power-Up During Normal Operation The serial interface has no power-on reset. Code 010XXXXXXXXX, sent immediately following a power-up places, all outputs into normal operating mode and disables the thermal switch. OPERATION IN HIGH AMBIENT TEMPERATURE To extend the maximum operating junction temperature of the AD8385 to 150°C, keep the thermal switch disabled during normal operation. Code format X10XXXXXXXXX ensures a disabled thermal switch. POWER SUPPLY SEQUENCING As indicated in the Absolute Maximum Ratings, the voltage at any input pin cannot exceed its supply voltage by more than 0.5 V. To ensure compliance with the Absolute Maximum Ratings, the following power-up and power-down sequencing is recommended. During power-up, initial application of nonzero voltages to any of the input pins must be delayed until the supply voltage ramps up to its highest operational input voltage. During power-down, the voltage at any input pin must reach zero during a period not exceeding the hold-up time of the power supply. Failure to comply with the Absolute Maximum Ratings, may result in functional failure or damage to the internal ESD diodes. Damaged ESD diodes can cause temporary parametric failures, which can result in image artifacts. Damaged ESD diodes cannot provide full ESD protection, reducing reliability. Table 16. Power-On Power-Off 1. Apply power to supplies. 1. Remove power from I/Os. 2. Apply power to other I/Os. 2. Remove power from supplies. VBIAS GENERATION—V1, V2 INPUT PIN FUNCTIONALITY To avoid image flicker, a symmetrical ac voltage is required and a bias voltage of approximately 1 V minimum must be maintained across the pixels of HTPS LCDs. The AD8385 provides an internal and external method of maintaining this bias voltage. Internal Bias Voltage Generation Standard systems that internally generate the bias voltage reserve the uppermost code range for the bias voltage, and use the remaining code range to encode the video for gamma correction. A high degree of ac symmetry is guaranteed by the AD8385 in these systems. The V1 and V2 inputs in these systems are tied together and are normally connected to VCOM, as shown in Figure 18. VBIAS = 1V VCOM VFS = 5V VFS = 5V RESERVED CODE RANGE VBIAS = 1V V2 V1 VCOM AD8385 1023 820 Figure 18. V1, V2 Connection and Transfer Function in a Typical Standard System External Bias Voltage Generation In systems that require improved brightness resolution and higher accuracy, the V1 and V2 inputs, connected to external voltage references, provide the necessary bias voltage (VBIAS) while allowing the full code range to be used for gamma correction. To ensure a symmetrical ac voltage at the AD8385’s outputs, VBIAS must remain constant for both states of INV. Therefore, V1 and V2 are defined as V1 = VCOM – VBIAS V2 = VCOM + VBIAS |
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