OPA314AIDBVT datasheet(22/53 Pages) TI2

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287±

5()

OUT

2.7 V

VOUT+

VOUT±

VDIFF

VREF

2.5 V

VIN

Device

OPA314, OPA2314, OPA4314

SBOS563G – MAY 2011 – REVISED JUNE 2015

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8.2 Typical Application

Some applications require differential signals. Figure 39 shows a simple circuit to convert a single-ended input of

0.1 V to 2.4 V into a differential output of ±2.3 V on a single 2.7-V supply. The output range is intentionally limited

to maximize linearity. The circuit is composed of two amplifiers. One amplifier functions as a buffer and creates a

voltage, VOUT+. The second amplifier inverts the input and adds a reference voltage to generate VOUT–. Both

VOUT+ and VOUT– range from 0.1 V to 2.4 V. The difference, VDIFF, is the difference between VOUT+ and VOUT–.

This makes the differential output voltage range 2.3 V.

Figure 39. Schematic for a Single-Ended Input to Differential Output Conversion

8.2.1 Design Requirements

The design requirements are as follows:

•

Supply voltage: 2.7 V

•

Reference voltage: 2.5 V

•

Input: 0.1 V to 2.4 V

•

Output differential: ±2.3 V

•

Output common-mode voltage: 1.25 V

•

Small-signal bandwidth: 1 MHz

8.2.2 Detailed Design Procedure

The circuit in Figure 39 takes a single-ended input signal, VIN, and generates two output signals, VOUT+ and

VOUT– using two amplifiers and a reference voltage, VREF. VOUT+ is the output of the first amplifier and is a

buffered version of the input signal, VIN (as shown in Equation 1). VOUT– is the output of the second amplifier

which uses VREF to add an offset voltage to VIN and feedback to add inverting gain. The transfer function for

VOUT– is given in Equation 2.

(1)

(2)

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