8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

Figure 8-1 shows the BUF634 device connected as an open-loop buffer. The source impedance and optional

input resistor, RS, influence frequency response: see Section 6.8. Bypass power supplies with capacitors

connected close to the device pins. Capacitor values as low as 0.1 µF provide stable operation in most

applications, but high output current and fast output slewing can demand large current transients from the power

supplies. Solid tantalum 10-µF capacitors are recommended. High-frequency, open-loop applications can benefit

from special bypassing and layout considerations. For more information, see Section 8.1.1.

V–

10µF

10µF

V

O

BUF634

Optional connection for

wide bandwidth — see text.

R

S

3

V+

6

R

L

4

7

1

V

IN

DIP/SO-8

Pinout shown

Figure 8-1. Buffer Connections

8.1.1 High Frequency Applications

The excellent bandwidth and fast slew rate of the BUF634 device are useful in a variety of high frequency

open-loop applications. When operated open-loop, printed-circuit-board layout and bypassing technique can

affect dynamic performance.

For best results, use a ground plane-type circuit board layout and bypass the power supplies with 0.1-µF

ceramic chip capacitors at the device pins in parallel with solid tantalum 10-µF capacitors. Source resistance

affects high-frequency peaking, step-response overshoot and ringing. Best response is usually achieved with a

series input resistor of 25 Ω to 200 Ω, depending on the signal source. Response with some loads (especially

capacitive) can be improved with a resistor of 10 Ω to 150 Ω in series with the output.

Figure 8-2. High Performance Headphone Driver

BUF634

SBOS030C – AUGUST 2000 – REVISED MARCH 2024

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