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CLC453ALC Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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CLC453ALC Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 12 page  7 http://www.national.com CLC453 Operation The CLC453 is a current feedback buffer built in an advanced complementary bipolar process. The CLC453 operates from a single 5V supply or dual ±5V supplies. Operating from a single 5V supply, the CLC453 has the following features: s Gains of +1, -1, and 2V/V are achievable without external resistors s Provides 100mA of output current while consuming only 15mW of power s Offers low -65/-84dBc 2nd and 3rd harmonic distortion s Provides BW > 80MHz and 1MHz distortion < -70dBc at Vo = 2Vpp The CLC453 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 CLC452 can be used. The CLC452 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: s Independence of AC bandwidth and voltage gain s Inherently stable at unity gain s Adjustable frequency response with feedback resistor s High slew rate s 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. Equation 1 where: s Av is the closed loop DC voltage gain s Rf is the feedback resistor s Z(j ω) is the CLC453’s open loop transimpedance gain s is the loop gain The denominator of Equation 1 is approximately equal to 1 at low frequencies. Near the -3dB corner frequency, the interaction between Rf and Z(jω) dominates the circuit performance. The value of the feedback resistor has a large affect on the circuits performance. Increasing Rf has the following affects: s Decreases loop gain s Decreases bandwidth s Reduces gain peaking s Lowers pulse response overshoot s Affects frequency response phase linearity V V A 1 R Z(j ) o in v f = + ω Z j Rf ω ( ) CLC453 Design Information Closed Loop Gain Selection The CLC453 is a current feedback op amp with Rf = 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 as described in the chart below. The gain accuracy of the CLC453 is excellent and stable over temperature change. The internal gain setting resistors, Rf and Rg 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 (Rf/Rg) remains constant. If an external resistor is used in series with Rg, gain accuracy over temperature will suffer. Single Supply Operation (VCC = +5V, VEE = GND) The specifications given in the +5V Electrical Character- istics table for single supply operation are measured with a common mode voltage (Vcm) of 2.5V. Vcm is the voltage around which the inputs are applied and the output voltages are specified. Operating from a single +5V supply, the Common Mode Input Range (CMIR) of the CLC453 is typically +0.8V to +4.2V. The typical output range with RL=100Ω is +1.0V to +4.0V. For single supply DC coupled operation, keep input signal levels above 0.8V DC. For input signals that drop below 0.8V DC, AC coupling and level shifting the signal are recommended. The non-inverting and inverting configurations for both input conditions are illustrated in the following 2 sections. DC Coupled Single Supply Operation Figures 1, 2, and 3 on the following page, show the recommended configurations for input signals that remain above 0.8V DC. Gain Input Connections Av Non-Inverting (pin3) Inverting (pin2) -1V/V ground input signal +1V/V input signal NC (open) +2V/V input signal ground |
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