OPA1677DBVT datasheet(24/51 Pages) TI

24 / 51 page

8.2.4 Composite Headphone Amplifier

Figure 8-6 shows the BUF634A buffer inside the feedback loop of the OPA1678 to increase the available

output current for low-impedance headphones. If the BUF634A is used in wide-bandwidth mode, no additional

components besides the feedback resistors are required to maintain loop stability.

200

100 F

0.1 F

100 F

OPA1678

BUF634A

12 V

-12 V

100 k

Output

Input

RBW

Figure 8-6. Composite Headphone Amplifier (Single-Channel Shown)

8.2.5 Differential Line Receiver With AC-Coupled Outputs

Figure 8-7 shows the OPA1678 used as an integrator that drives the reference pin of the INA1650, which forces

the output dc voltage to 0 V. This configuration is an alternative to large ac-coupling capacitors that can distort at

high output levels. The low input bias current and low input offset voltage of the OPA1678 make the device an

excellent choice for integrator applications.

18 V

C1 10 F

C2 10 F

Input Differential

Audio Signals

Output Single-Ended

Audio Signals

100 k

XLR Connector

R3 1 M

C5 1 F

100 k

C3 10 F

C4 10 F

R6 1 M

IN- A

IN+ A

VCC

OUT A

VMID(OUT)

COM A

IN+ B

IN- B

COM B

OUT B

VMID(IN)

VEE

REF A

REF B

INA1650

C6 0.1 F

-18 V

C7 1 F

C8 0.1 F

18 V

OPA1678

1 M

100 nF

-18 V

OPA1678

1 M

C10

100 nF

Figure 8-7. Differential Line Receiver With AC-Coupled Outputs

OPA1677, OPA1678, OPA1679

SBOS855E – JANUARY 2017 – REVISED DECEMBER 2022

www.ti.com

Submit Document Feedback

Product Folder Links: OPA1677 OPA1678 OPA1679

OPA1677DBVT Datasheet(PDF) 24 Page - Texas Instruments

OPA1677DBVT Datasheet(HTML) 24 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

Datasheet Download

Link URL