AD677KN

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Data Acquisition - Analog to Digital Converters (ADC) are used to convert analog data into digital form. The AD677KN is one type of ADC, which is capable of converting analog signals into digital data of up to 14 bits resolution with fast response time. It is especially suitable for industrial, medical, aerospace and other applications which require precise data acquisition and precise measurement.

The AD677KN incorporates a user-programmable gain amplifier (PGA), a precision sigma-delta (ΔΣ) analog-to-digital converter (ADC), and a serial digital interface, with wide ranging performance capabilities. The PGA allows for scaling of input signals to the required amplitude range for ADC operation. This also eliminates the need for prefilters to processes the input signals prior to conversion. With its onboard delta-sigma ADC, the AD677KN achieves an HD2 of less than -82dB.

The AD677KN integrates a dual-slope conversion technique, which allows the device to autonomously convert analog input into a digital representation of the signal. The principle of dual-slope integration is shown in the illustration below. The initial conversion begins with a known resistor (R1) current and charges the sampling capacitor (C1) until the reference voltage is reached. This is followed by a discharging (integration) phase where the capacitor discharges for a predetermined period of time (t1) and is then compared to the reference voltage. During this period the voltage across the capacitor drops approximately linearly, and the time required for the voltage to drop from its initial value to the reference voltage is proportional to the input signal. The output of the ADC is then determined as the sampling rate is decreased while a linearization loop compares the analog input to the reference voltage, and hence a digital data stream is produced. By controlling the timing of the discharge and charge cycles, the AD677KN converts the analog signal into an accurate digital output.

The AD677KN has a sampling rate of up to 60kS/s and provides outputs in 12-, 14-, 16- and 18-bit resolutions. With up to 14-bit resolution, the AD677KN is capable of accurately digitizing input signals with a full-scale range from ±10mV to ±10V and ac dc performance from ±50µV to ±10V. It also offers excellent signal-to-noise ratio (SNR) of up to 93dB and the option of offset and gain errors cancellation. The AD677KN has excellent power-down mode, allowing it to consume only 4µA in sleep mode.

The AD677KN is highly suitable for a variety of industrial and medical data acquisition applications, as it provides a low-noise and low-power solution. It is also ideal for a wide range of field deployments and can provide accurate measurement of pressure, temperature and signal velocity. The AD677KN is configured via serial communication interface and is available in a 28-lead SSOP package.

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