Description:The ISL59837 is a revolutionary device that allows true singlesupply operation of video amplifiers. Designed for systems requiring output swing below ground but lacking a negative power supply, the ISL59837 generates the required negative rail internally from a +3. 3V power supply. This allows for DC-accurate coupling of video onto a 75Ω double-terminated line. The buffers have an integrated 6dB, eliminating the need for external gain-setting resistors. An external reference voltage can be applied to the RE
The recommended PCB layout for optimal performance involves keeping the analog and digital grounds separate, using a solid ground plane, and placing the device close to the power supply. Additionally, it's recommended to use a 4-layer PCB with a dedicated layer for the analog signals, and to minimize the length of the traces connecting the device to the power supply and load.
To ensure stability and prevent oscillations in the output voltage, it's recommended to use a minimum output capacitance of 10uF, and to ensure that the output capacitor has a low equivalent series resistance (ESR). Additionally, the device's compensation pin should be connected to a capacitor and resistor network to provide additional stability.
The maximum input voltage that can be applied to the ISL59837IAZ without damaging it is 18V. However, it's recommended to operate the device within the recommended input voltage range of 4.5V to 15V to ensure optimal performance and reliability.
The device's output voltage can be programmed using the VID pins by connecting them to a resistor network that sets the desired output voltage. The VID pins are connected to a internal resistor divider network that sets the output voltage based on the voltage applied to the pins. The output voltage can be calculated using the formula provided in the datasheet.
The device's power-on reset (POR) timing is approximately 10ms, during which the output voltage is held low. After the POR timing, the output voltage will ramp up to the programmed value. The POR timing can affect the output voltage by causing a delay in the output voltage reaching its final value, and it's recommended to ensure that the load can tolerate this delay.
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ISL59837IAZ Overview
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