OPA4316IPW datasheet(23/65 Pages) TI2

23 / 65 page

out

ref

diff

ref

2 V

out

ref

out

diff

out

ref

out

ref

· §

¸ ¨

OPA316, OPA2316, OPA2316S, OPA4316

www.ti.com

SBOS703F – APRIL 2014 – REVISED OCTOBER 2016

Product Folder Links: OPA316 OPA2316 OPA2316S OPA4316

Submit Documentation Feedback

(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. Using conditions in Equation 4 and Equation 5 and

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 VREF. The differential output range is 2 × VREF. Furthermore, the common-mode voltage is

one half of VREF, as shown in Equation 7.

(3)

(4)

(5)

(6)

(7)

8.2.2.1 Amplifier Selection

Linearity over the input range is key for good dc accuracy. The common-mode input range and 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, so the OPAx316 is selected because the bandwidth is greater than

the target of 5 MHz. The bandwidth and power ratio makes this device power efficient and the low offset and drift

ensure good accuracy for moderate precision applications.

8.2.2.2 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 uses resistors with resistance values of

49.9 kΩ and tolerances of 0.1%. However, if the noise of the system is a key parameter, smaller resistance

values (6 kΩ or lower) can be selected to keep the overall system noise low. This ensures that the noise from the

resistors is lower than the amplifier noise.

OPA4316IPW Datasheet(PDF) 23 Page - Texas Instruments

OPA4316IPW Datasheet(HTML) 23 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datasheet Download

Link URL