OPA2336

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 6

www.unisonic.com.tw

QW-R502-392.a

APPLICATION INFORMATION

The UTC OPA2336 is a CMOS operational amplifier, its outstanding features and functions make it suitable for

several applications. The UTC OPA2336 is unity-gain stable and can be protected under the reverse battery

voltages conditions. 0.01μF ceramic capacitors are required to bypass the power supply.

OPERATING VOLTAGE

The UTC OPA2336 is operating on a single supply ranging from 2.1V to +5.5V, most behavior remains

unchanged throughout the full operating voltage range. The UTC OPA2336 is fully specified for operation from

+2.3V to +5.5V; a single limit applies over the supply range. Moreover, this device performs well over a temperature

range of -40°C to +85°C.

INPUT VOLTAGE

The UTC OPA2336 allows input common-mode range varies from (V-)-0.2V to (V+)-1V, normal behaviors should

operate within this range. In addition, the absolute maximum input voltage is 300mV beyond the supplies. Thus,

inputs greater than the input common-mode range but less than maximum input voltage, while not valid, will not

cause any damage to the op-amp.

Normally, input bias current is approximately 1pA. However, the input pin may be applied to an excess inrush

current, which is encountered when input voltages are higher than the power supplies. This device is not damaged

unless the current on the input pins is less than 10mA. This is easily accomplished with an input resistor, as shown

in Figure 1.

5kΩ

+

-

OPA2336

10mA max

+5V

Figure 1. Input Current Protection for Voltages

Exceeding the Supply Voltage

CAPACITIVE LOAD AND STABILITY

The UTC OPA2336 under certain conditions may become unstable. For device’s stability, there are many

factors considered besides the amplifier gain, load value and so on.

The UTC OPA2336 can drive a wide range of capacitive loads, it can drive approximately 10,000pF when

properly configured. An op amp in unity-gain configuration is the most vulnerable to capacitive load. The capacitive

load reacts with the op amp’s output resistance, along with any additional load resistance, to create a pole in the

response which degrades the phase margin. In unity gain, 300pF capacitive load is to be optimal for the UTC

OPA2336

. Increasing gain enhances the amplifier’s ability to drive loads beyond this level.

In order to improve capability of driving capacitive load in the unity-gain configuration, a 50Ω to 100Ω resistor is

expected to locate inside the feedback loop, as shown in Figure 2. This reduces ringing with large capacitive loads

while maintaining DC accuracy.