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CLC5612 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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CLC5612 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 18 page  Typical Performance Characteristics (A V = +2, RL= 100Ω,VS +5V 1,V CM =VEE+(VS/2), RL tied to VCM, unless specified) (Continued) Application Division CLC5612 Operation The CLC5612 is a current feedback buffer fabricated in an advanced complementary bipolar process. The CLC5612 operates from a single 5V supply or dual ±5V supplies. Operating from a single 5V supply, the CLC5612 has the following features: • Gains of +1, −1, and 2V/V are achievable without external resistors • Provides 100mA of output current while consuming only 7.5mW of power • Offers low −79/−81dBc 2nd and 3rd harmonic distortion • Provides BW>50MHz and 1MHz distortion <−75dBc at V O =2VPP The CLC5612 performance is further enhanced in ±5V supply applications as indicated in the ±5V Electrical Characteristics table and ±5V Typical Performance plots. If gains other than +1, −1, or +2V/V are required, then the CLC5602 can be used. The CLC5602 is a current feedback amplifier with near identical performance and allows for external feedback and gain setting resistors. Current Feedback Amplifiers Some of the key features of current feedback technology are: • Independence of AC bandwidth and voltage gain • Inherently stable at unity gain • Adjustable frequency response with feedback resistor • High slew rate • Fast settling Current feedback operation can be described using a simple equation. The voltage gain for a non-inverting or inverting current feedback amplifier is approximated by Equation 1. V V A 1 R Z(j ) o in v f = + ω (1) where: • A V is the closed loop DC voltage gain • R f is the feedback resistor • Z(j ω) is the CLC5612’s open loop transimpedance gain • Z(j ω)/R f is the loop gain The denominator of Equation 1 is approximately equal to 1 at low frequencies. Near the −3dB corner frequency in the interaction between R f and Z(j ω) dominates the circuit performance. The value of the feedback resistor has a large affect on the circuits performance. Increasing R f has the following affects: • Decreases loop gain • Decreases bandwidth • Reduces gain peaking • Lowers pulse response overshoot • Affects frequency response phase linearity CLC5612 Design Information Closed Loop Gain Selection The CLC5612 is a current feedback op amp with R f=Rg=1kΩ on chip (in the package). Select from three closed loop gains without using any external gain or feedback resistors. Implement gains of +2, +1, and −1V/V by connecting pins 2 and 3 (or 5 and 6) as described in the chart below. Gain A V Input Connections Non-Inverting (pins 3,5) Inverting (pins 2,6) −1V/V ground input signal +1V/V input signal NC (open) +2V/V input signal ground The gain accuracy of the CLC5612 is excellent and stable over temperature change. The internal gain setting resistors, R f and R g are diffused silicon resistors with a process variation of ± 20% and a temperature coefficient of −2000ppm/˚C. Although their absolute values change with processing and temperature, their ratio (R f/Rg) remains constant. If an external resistor is used in series with R g, gain accuracy over temperature will suffer. Single Supply Operation (V cc = +5V/V, VEE=GND) The specifications given in the ±5V Electrical Characteristics table for single supply operation are measured with a common mode voltage (V cm) of 2.5V. Vcm is the voltage around which the inputs are applied and the output voltages are specified. Pulse Crosstalk Time (10ns/div) Active Output Channel Inactive Output Channel DS015001-36 www.national.com 11 |
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