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BUF601AU Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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BUF601AU Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 14 page 9 ® BUF600, 601 I Q vs TIME (Warmup) 0 100 99 98 97 96 95 94 12345678 BUF601 BUF600 Time (s) BUF600, BUF601 GAIN ERROR vs INPUT VOLTAGE –5 5 4 3 2 1 0 Input Voltage (V) –4 –3 –2 –1 0 1 2 3 4 5 BUF600 BUF601 (Full Temperature Range, R LOAD = 10kΩ) TYPICAL PERFORMANCE CURVES (CONT) At VCC = ±5V, RLOAD = 100Ω (BUF601), RLOAD = 200Ω (BUF600), and TA = 25°C, unless otherwise noted. DISCUSSION OF PERFORMANCE The BUF600 and BUF601 are fabricated using a high- performance complementary bipolar process, which provides high-frequency NPN and PNP transistors with gigahertz transition frequencies (fΤ). Power supplies are rated at ±6V maximum, with the data sheet parameters specified at ±5V supplies. The BUF600 and BUF601 are 3-stage open-loop buffer amplifiers consisting of comple- mentary emitter followers with a symmetrical class AB Darlington output stage. The complementary structure pro- vides both sink and source current capability independent of the output voltage, while maintaining constant output and input impedances. The amplifiers use no feedback, so their low-frequency gain is slightly less than unity and somewhat dependent on loading. The optimized input stage is respon- sible for the high slew rate of up to 3600V/ µs, wide large signal bandwidth of 320MHz, and quiescent current reduc- tion to ±3mA (BUF600) and ±6mA (BUF601). These features yield an excellent large signal bandwidth/quiescent current ratio of 320MHz, 5Vp-p at 3mA/6mA quiescent current. The complementary emitter followers of the input stage work with current sources as loads. The internal PTAT power supply controls their quiescent current and with its temperature characteristics keeps the transconductance of the buffer amplifiers constant. The Typical Performance Curves show the quiescent current variation versus temperature. The cross current in the input stage is kept very low, resulting in a low input bias current of 0.7 µA/1.5µA and high input impedance of 4.8M Ω || 1pF/2.5MΩ || 1pF. The second stage drives the output transistors and reduces the output impedance and the feedthrough from output to input when driving RLC loads. The input of the BUF600 and BUF601 looks like a high resistance in parallel with a 1pF capacitance. The input characteristics change very little with output loading and input voltage swing. The BUF600 and BUF601 have excel- lent input-to-output isolation and feature high tolerance to variations in source impedances. A resistor between 100 Ω and 250 Ω in series with the buffer input lead will usually eliminate oscillation problems from inductive sources such as unterminated cables without sacrificing speed. Another excellent feature is the output-to-input isolation over a wide frequency range. This characteristic is very important when the buffer drives different equipment over cables. Often the cable is not perfect or the termination is incorrect and reflections arise that act like a signal source at the output of the buffer. Open-loop devices often sacrifice linearity and introduce frequency distortion when driving low load impedance. The BUF600 and BUF601, however, do not. Their design yields low distortion products. The harmonic distortion character- istics into loads greater than 100 Ω (BUF601) and greater than 200 Ω (BUF600) are shown in the Typical Performance Curves. The distortion can be improved even more by increasing the load resistance. Differential gain (DG) and differential phase (DP) are among the important specifications for video applications. DG is defined as the percent change in gain over a specified change in output voltage level (0V to 0.7V.) DP is defined as the phase change in degrees over the same output voltage change. Both DG and DP are specified at the PAL subcarrier frequency of 4.43MHz. The errors for differential gain are lower than 0.5%, while those for differential phase are lower than 0.04 °. With its minimum 20mA long-term DC output current capability, 50mA pulse current, low output impedance over frequency, and stability to drive capacitive loads, the BUF601 can drive 50 Ω and 75Ω systems or lines. The BUF600 with lower quiescent current and therefore higher output imped- ance is well-suited primarily to interstage buffering. This type of open-loop amplifier is a new and easy-to-use step to prevent an interaction between two points in complex high- speed analog circuitry. |
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