Description:The Intersil ICL7136 is a high performance, low power 31/2 digit, A/D converter. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7136 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive. The ICL7136 brings together a combination of high accuracy, versatility, and true economy. It features auto-zero to less than 10µV, zero drift of less than 1µV/oC, input bias current of 10pA (Max), and rollover error of less than one
A good PCB layout for the ICL7136CM44ZT 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 low-ESR capacitor for the VCC pin and to minimize the length of the traces connected to the input pins.
To ensure accurate voltage measurement, it's essential to use a high-impedance input source, such as a voltage divider or an op-amp buffer, to drive the input pins. Additionally, the input voltage range should be within the specified range of 0V to 5V, and the input impedance should be at least 10kΩ.
The maximum clock frequency that can be used with the ICL7136CM44ZT is 400 kHz. Exceeding this frequency may result in inaccurate conversions or device malfunction.
The ICL7136CM44ZT's POR and BOR features can be handled by using an external reset circuit or by using a microcontroller to monitor the device's reset output. It's essential to ensure that the device is properly reset after power-on or brown-out conditions to prevent incorrect conversions or device malfunction.
The recommended method for calibrating the ICL7136CM44ZT involves applying a known input voltage and adjusting the device's internal calibration registers to achieve the desired accuracy. The calibration process should be performed at the operating temperature range and with the recommended power supply voltage.
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ICL7136CM44ZT Overview
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