The BUF634A is a high-performance, high-fidelity, open-loop buffer capable of driving 250 mA of output current. The BUF634A is a 36-V device with bandwidth adjustable from 35 MHz to 210 MHz by varying the value of an external resistor between the V– and BW pins. The BUF634A can be used as a standalone open-loop driver, or inside the feedback loop of a precision op amp to provide both high-precision as well as large output current drive with improved capacitive load drive.
For low-power applications, the BUF634A operates on a 1.5-mA quiescent current with a 250-mA output, 3750-V/µs slew rate, and 35-MHz bandwidth. The device consumes 8.5-mA quiescent current in wide-bandwidth mode with a 210-MHz bandwidth. The BUF634A is fully protected by an internal current limit in its output stage and by thermal shutdown, making the device rugged and easy to use.
The BUF634A is an upgrade to the BUF634 with 16% higher bandwidth and a higher slew rate at 43% reduced supply current. See the Device Comparison Table for a selection of unity-gain, open-loop buffers from Texas Instruments. This device is rated to function over the extended industrial temperature range of –40°C to +125°C.
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|Part number||Order||Architecture||Number of channels (#)||Total supply voltage (Min) (+5V=5, +/-5V=10)||Total supply voltage (Max) (+5V=5, +/-5V=10)||BW @ Acl (MHz)||Acl, min spec gain (V/V)||Slew rate (Typ) (V/us)||Vn at flatband (Typ) (nV/rtHz)||Vn at 1 kHz (Typ) (nV/rtHz)||Iq per channel (Typ) (mA)||Vos (offset voltage @ 25 C) (Max) (mV)||Rail-to-rail||Features||Rating||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)||Input bias current (Max) (pA)||Offset drift (Typ) (uV/C)||GBW (Typ) (MHz)||Output current (Typ) (mA)||2nd harmonic (dBc)||3rd harmonic (dBc)||@ MHz|
||Bipolar||1||4.5||36||210||1||3750||3.4||3.4||8.5||60||No||Catalog||-40 to 125||SOIC | 8||8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)||1600000||240||250||-77||-79||0.02|
||Current FB||1||2.8||12.6||1000||1||8000||4.8||5.9||30||No||Catalog||-45 to 85||
SOIC | 8
SOT-23 | 5
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)