AD7862BRZ-10REEL

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The AD7862BRZ-10REEL is a low voltage, 8-bit resolution, sampling A/D converter with an internal 10 ksps track and hold amplifier. Along with its 4 µA power consumption and its small package, the chip is ideal for battery-powered and hand-held systems. Their applications range from medical, industrial, automotive and communications systems, to instrumentation.

The AD7862BRZ-10REEL is an analog-to-digital converter (ADC) that is capable of sampling inputs of up to 10 ksps. It includes a track and hold amplifier, sample and hold comparator, and a precision reference. In order to perform A/D conversions, the device is clocked with a master clock, which is typically connected to a 10 MHz oscillator. Depending on the frequency and accuracy of this clock signal, the A/D conversion rate can be adjusted.

The device utilizes an emittance-coupled differential track and hold amplifier in order to accurately sample, hold and convert the analog input signal into a digital count. This track and hold circuit works by charging and discharging two capacitors in response to the amplified input signal. The two capacitors form the track and hold, and have values that are matched with respect to each other, allowing the circuit to precisely track and hold the input signal.

When an input is applied, the track and hold amplifiers first sample the input signal, after which the sampled voltage is subsequently compared with a reference voltage of known value. By comparing the two voltages, the analog-to-digital converter produces a binary number, which is a representation of the analog input. The result of this comparison is then loaded into a register, and is available at the device’s output.

The AD7862BRZ-10REEL also includes an internal reference and a highly accurate track and hold amplifier. The 2.0V/± 0.75mV internal reference voltage allows for accurate conversion of analog signals. When the reference voltage is applied to one side of the track and hold circuit, the reference voltage causes the op-amp to charge or discharge the capacitor according to the input signal’s level. By using the difference between the reference voltage and the analog input signal, the track and hold amplifier is able to accurately compute the digital output.

The AD7862BRZ-10REEL is an ideal device for battery-powered and hand-held systems, as it consumes only 4 µA of power. It is available in an 8-pin, plastic DIP and a 10-pin, 3 mm × 3 mm, 24-lead QFN. This device is also design tolerant, nominal supply voltage of 3.3 V, is ratiometric analog input, and is CMOS-logic compatible.

In summary, the AD7862BRZ-10REEL is a low voltage, 8-bit resolution, sampling A/D converter with an internal 10 ksps track and hold amplifier. It utilizes an emittance-coupled differential track and hold amplifier to accurately sample, hold and convert the analog input signal into a digital count. It includes an internal reference and a highly accurate track and hold amplifier. The 2.0V/± 0.75mV internal reference voltage allows for accurate conversion of analog signals. The device is ideal for battery-powered and hand-held systems, as it consumes only 4 µA of power. It is available in an 8-pin, plastic DIP and a 10-pin, 3 mm × 3 mm, 24-lead QFN. This device is also design tolerant, nominal supply voltage of 3.3 V, is ratiometric analog input, and is CMOS-logic compatible.

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