SPT231 查看數據表（PDF） - Signal Processing Technologies
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SPT231 Datasheet PDF : 4 Pages
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FAST SETTLING, WIDEBAND BUFFER/AMPLIFIER (AV = ±1 to ±5)
General Description
The SPT231 Buffer/Amplifier is a wideband operational amplifier
designed specifically for high-speed, low-gain applications. The
SPT231 is based on a current feedback op amp topology-a unique
design that both eliminates the gain-bandwidth tradeoff and permits
unprecedented high-speed performance. (See table below.)
The SPT231 Buffer/Amplifier is the ideal design alternative to low
precision open-loop buffers and oscillation-prone conventional op
amps. The SPT231 offers precise gains from ±1.000 to ±5.000
and linearity that is a true 0.1%-even for demanding 50Ω loads.
Open-loop buffers, on the other hand, offer a nominal gain of 0.95
±0.03 and a linearity of only 3% for typical loads. A buffer’s
settling time may look impressive but it is usually specified at
unrealistically large load resistances or when the effects of
thermal tail are not included; the SPT231 Buffer/Amplifier settles
to 0.05% in 15ns-while driving a 100Ω load.
Features
s 165MHz closed-loop – -3dB bandwidth
s 15ns settling to 0.05%
s 1mV input offset voltage, 10µV/°C drift
s 100mA output current
s Excellent AC and DC linearity
s Direct replacement for CLC231
Applications
s Driving flash A/D converters
s Precision line driving
(a gain of 2 cancels matched-line losses)
s DAC current-to-voltage conversion
s Low-power, high-speed applications
(50mW @ ±5V)
Offsets and drifts, usually a low priority in conventional high-
speed op amp designs, were not ignored in the SPT231; the input
offset voltage is typically 1mV and input offset voltage drift is only
10µV/°C. The SPT231 is stable and oscillation-free across the
entire gain range and since it’s internally compensated, the user
is saved the trouble of designing external compensation networks
and having to “tweak” them in production. The absence of a gain-
bandwidth tradeoff in the SPT231 allows performance to be
predicted easily; the table below shows how the bandwidth is
affected very little by changing the gain setting.
Bottom View
The SPT231 is constructed using thin film resistor/bipolar transis-
tor technology, and is available in the following versions:
SPT231AIH -25°C to +85°C 12-pin TO-8 can
SPT231AMH -55°C to +125°C 12-pin TO-8 can, features burn-
in and hermetic testing
Typical Performance
Package Dimensions
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: sales@spt.com
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