AD8627ARZ Precision Low Power Single-Supply JFET Amplifier with 5 MHz Bandwidth and Rail-to-Rail Output

The AD862x is a precision JFET input amplifier. It features true single-supply operation, low power consumption, and rail-to-rail output. The outputs remain stable with capacitive loads of over 500 pF; the supply current is less than 630 μA/amp. Applications for the AD862x include photodiode transimpedance amplification, ATE reference level drivers, battery management, both line powered and portable instrumentation, and remote sensor signal conditioning, which includes automotive sensors. The AD862x’s ability to swing nearly rail-to-rail at the input and rail-to-rail at the output enables it to be used to buffer CMOS DACs, ASICs, and other wide output swing devices in single-supply systems. The 5 MHz bandwidth and low offset are ideal for precision filters. The AD862x is fully specified over the industrial temperature range. (−40°C to +85°C). The AD8627 is available in both 5-lead SC70 and 8-lead SOIC surface-mount packages (SC70 packaged parts are available in tape and reel only). The AD8626 is available in MSOP and SOIC packages, while the AD8625 is available in TSSOP and SOIC packages.

The AD862x is one of the smallest and most economical JFETs offered. It has true single-supply capability and has an input voltage range that extends below the negative rail, allowing the part to accommodate input signals below ground. The rail-to-rail output of the AD862x provides the maximum dynamic range in many applications. To provide a low offset, low noise, high impedance input stage, the AD862x uses n-channel JFETs. The input common-mode voltage extends from 0.2 V below –VS to 2 V below +VS. Driving the input of the amplifier, configured in the unity gain buffer, closer than 2 V to the positive rail causes an increase in common-mode voltage error, as illustrated in Figure 15, and a loss of amplifier bandwidth. This loss of bandwidth causes the rounding of the output waveforms shown in Figure 39 and Figure 40, which have inputs that are 1 V and 0 V from +VS, respectively. The AD862x does not experience phase reversal with input signals close to the positive rail, as shown in Figure 29. For input voltages greater than +VSY, a resistor in series with the AD862x’s noninverting input prevents phase reversal at the expense of greater input voltage noise. This current-limiting resistor should also be used if there is a possibility of the input voltage exceeding the positive supply by more than 300 mV, or if an input voltage is applied to the AD862x when ±VSY = 0. Either of these conditions damages the amplifier if the condition exists for more than 10 seconds. A 10 kΩ resistor allows the amplifier to withstand up to 10 V of continuous overvoltage, while increasing the input voltage noise by a negligible amount.

Standard export packaging available. Customers can choose from cartons, wooden cases, and wooden pallets according to their requirements.