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RC4558ID Datasheet(PDF) 11 Page - Texas Instruments

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Part # RC4558ID
Description  Dual General-Purpose Operational Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

RC4558ID Datasheet(HTML) 11 Page - Texas Instruments

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OUT
OUT
cm
REF
V
V
1
V
V
2
2
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-
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RC4558
www.ti.com
SLOS073G – MARCH 1976 – REVISED OCTOBER 2014
Typical Application (continued)
8.1.1 Design Requirements
The design requirements are as follows:
Supply voltage: 15 V
Reference voltage: 12V
Input: 2 V to 10 V
Output differential: ±8 V
8.1.2 Detailed Design Procedure
The circuit in Figure 14 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 (see 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
Equation 2.
VOUT+ = VIN
(1)
(2)
The differential output signal, VDIFF, is the difference between the two single-ended output signals, VOUT+ and
VOUT–. Equation 3 shows the transfer function for VDIFF. By applying the conditions that R1 = R2 and R3 = R4, the
transfer function is simplified into Equation 6. Using this configuration, the maximum input signal is equal to the
reference voltage and the maximum output of each amplifier is equal to the VREF. The differential output range is
2×VREF. Furthermore, the common mode voltage will be one half of VREF (see Equation 7).
(3)
VOUT+ = VIN
(4)
VOUT– = VREF – VIN
(5)
VDIFF = 2×VIN – VREF
(6)
(7)
8.1.2.1 Amplifier Selection
Linearity over the input range is key for good dc accuracy. The common mode input range and the output swing
limitations determine the linearity. In general, an amplifier with rail-to-rail input and output swing is required.
Bandwidth is a key concern for this design. Because RC4558 has a bandwidth of 3 MHz, this circuit will only be
able to process signals with frequencies of less than 3 MHz.
8.1.2.2 Passive Component Selection
Because the transfer function of VOUT– is heavily reliant on resistors (R1, R2, R3, and R4), use resistors with low
tolerances to maximize performance and minimize error. This design used resistors with resistance values of
36 k
Ω with tolerances measured to be within 2%. But, if the noise of the system is a key parameter, the user can
select smaller resistance values (6 k
Ω or lower) to keep the overall system noise low. This ensures that the noise
from the resistors is lower than the amplifier noise.
Copyright © 1976–2014, Texas Instruments Incorporated
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