OPA607 datasheet(7/21 Pages) TI1

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OPA607

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Feature Description (continued)

7.3.2 Rail-to-Rail Output and Driving Capacitive Loads

Designed as a low-power, low-voltage operational amplifier, the OPA607 delivers a robust output drive capability.

For resistive loads of 10 kΩ, the output swings to within a few millivolts of either supply rail, regardless of the

applied power-supply voltage. Different load conditions change the ability of the amplifier to swing close to the

rails. The OPA607 drives up to a nominal capacitive load of 10 pF on the output with no special consideration

and without the need of a series isolation resistor RO. When driving capacitive loads greater than 10 pF, TI

recommends using RO as shown in Figure 1 in series with the output as close to the device as possible. Without

RO, the external capacitance (CL) interacts with the output impedance (ZO) of the amplifier, resulting in stability

issues. Inserting RO isolates CL from ZO and restores the phase margin. Figure 1 shows the test circuit.

Figure 1. Input Current Protection and Driving Capacitive Loads

7.3.3 Input and ESD Protection

When the primary design goal is a linear amplifier with high CMRR, do not exceed the op amp input common-

mode voltage range (VCM). This CMRR is used to set the common-mode input range specifications in the

Electrical Characteristics table. The typical specifications for the OPA607 are from the negative rail to 1.1 V

below the positive rail. Assuming the op amp is in linear operation, the voltage difference between the input pins

is small (ideally 0 V) and the input common-mode voltage can be analyzed at either input pin; the other input pin

is assumed to be at the same potential. The voltage at VIN+ is easy to evaluate. In a noninverting configuration

(Figure 1) the input signal, VIN+, must not exceed the VCM rating. However, in an inverting amplifier configuration,

VIN+ must be connected to the voltage within VCM. The input signal applied at VIN- can be any voltage, such that

the output voltage swings with a headroom of 10mV from either of the supply rails.

The input voltage limits have fixed headroom to the power rails and track the power-supply voltages. For single

5-V supply, the linear input voltage range is 0 V to 3.9 V and with a 2.2-V supply this range is 0 V to 1.1 V. The

headroom to each power-supply rail is the same in either case: 0 V and 1.1 V.

The OPA607 also incorporates internal electrostatic discharge (ESD) protection circuits on all pins. For the input

and output pins, this protection primarily consists of current-steering diodes connected between the input and

power-supply pins. These ESD protection diodes also provide input overdrive protection, as long as the current is

limited with a series resistor to 10 mA, as stated in the Absolute Maximum Ratings table. Figure 1 shows a series

input resistor can be added to the driven input to limit the input current. The series input resistor also serves to

cancel input offset voltage resulting from bias current, as detailed in the Device Functional Modes section of the

OPA2834 data sheet.

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