OPA4316IPW.B datasheet(22/65 Pages) TI2

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out

2.7V

Vout+

Vout-

Vdiff

Vref

2.5V

Vin

OPA316, OPA2316, OPA2316S, OPA4316

SBOS703F – APRIL 2014 – REVISED OCTOBER 2016

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8.2 Typical Application

Some applications require differential signals. Figure 41 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–.

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

VOUT– which makes the differential output voltage range 2.3 V.

Figure 41. Schematic for a Single-Ended Input to Differential Output Conversion

8.2.1 Design Requirements

Table 1 lists the design requirements:

Table 1. Design Parameters

DESIGN PARAMETER

VALUE

Supply voltage

2.7 V

Reference voltage

2.5 V

Input voltage

0.1 V to 2.4 V

Output differential voltage

±2.3 V

Output common-mode voltage

1.25 V

Small-signal bandwidth

5 MHz

8.2.2 Detailed Design Procedure

The circuit in Figure 41 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)

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