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BUF634_07 Datasheet, PDF (9/12 Pages) Burr-Brown (TI) – 250mA HIGH-SPEED BUFFER | |||
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HIGH FREQUENCY APPLICATIONS
The BUF634âs excellent bandwidth and fast slew rate make it
useful in a variety of high frequency open-loop applications.
When operated open-loop, 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 0.1µF ceramic chip
capacitors at the device pins in parallel with solid tantalum
10µF capacitors. Source resistance will affect high-frequency
peaking and step response overshoot and ringing. Best
response is usually achieved with a series input resistor of
25⦠to 200â¦, depending on the signal source. Response
with some loads (especially capacitive) can be improved
with a resistor of 10⦠to 150⦠in series with the output.
V+
C1(1)
VIN
OPA
NOTE: (1) C1 not required
for most common op amps.
Use with unity-gain stable
high speed op amps.
VO
BUF634
BW
Wide BW mode
(if required)
Vâ
FIGURE 4. Boosting Op Amp Output Current.
OP AMP
RECOMMENDATIONS
OPA177, OPA1013
OPA111, OPA2111
OPA121, OPA234(1),
OPA130(1)
Use Low IQ mode. G = 1 stable.
OPA27, OPA2107
OPA602, OPA131(1)
OPA627, OPA132(1)
OPA637, OPA37
Low IQ mode is stable. Increasing CL may cause
excessive ringing or instability. Use Wide BW mode.
Use Wide BW mode, C1 = 200pF. G = 1 stable.
Use Wide BW mode. These op amps are not G = 1
stable. Use in G > 4.
NOTE: (1) Single, dual, and quad versions.
G = +21
V+
250â¦
5kâ¦
VIN 1µF
OPA132
100kâ¦
FIGURE 5. High Performance Headphone Driver.
BUF634
BW
Vâ
Drives headphones
or small speakers.
RL = 100â¦
f THD+N
1kHz 0.015%
20kHz 0.02%
+24V
+
10µF
10kâ¦
BUF634
10kâ¦
C(1)
+
12V
â
pseudo
ground
C(1)
+
12V
â
NOTE: (1) System bypass capacitors.
FIGURE 6. Pseudo-Ground Driver.
VIN
IO = ±200mA
±2V
OPA177
BUF634
Valve
10â¦
FIGURE 7. Current-Output Valve Driver.
1kâ¦
9kâ¦
10kâ¦
10kâ¦
1/2
1/2
VIN
OPA2234
BUF634
Motor
BUF634
OPA2234
±1V
±20V
at 250mA
FIGURE 8. Bridge-Connected Motor Driver.
®
9
BUF634
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