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CLC452 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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CLC452 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page 7 http://www.national.com CLC452 Operation The CLC452 is a current feedback amplifier built in an advanced complementary bipolar process. The CLC452 operates from a single 5V supply or dual ±5V supplies. Operating from a single supply, the CLC452 has the following features: s Provides 100mA of output current while consuming 15mW of power s Offers low -78/-85dB 2nd and 3rd harmonic distortion s Provides BW > 80MHz and 1MHz distortion < -70dBc at Vo = 2.0Vpp The CLC452 performance is further enhanced in ±5V supply applications as indicated in the ±5V Electrical Characteristics table and ±5V Typical Performance plots. 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 CLC452’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 Refer to the Feedback Resistor Selection section for more details on selecting a feedback resistor value. V V A 1 R Z(j ) o in v f = + ω Zj Rf ω () CLC452 Design Information 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 volt- age 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 CLC452 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 and 2 show the recommended non-inverting and inverting configurations for input signals that remain above 0.8V DC. + - CLC452 Rf 0.1 µF 6.8 µF Vo Vin Rg Rt 3 2 4 7 6 V V A1 R R o in v f g == + + Vcm VCC RL Vcm Note: Rt, RL and Rg are tied to Vcm for minimum power consumption and maximum output swing. Vcm + - Rf 0.1 µF 6.8 µF Vo Vin Rb 4 7 6 Rg V V A R R o in v f g == − + CLC452 Rt 3 2 Vcm VCC RL Vcm Note: Rb, provides DC bias for non-inverting input. Rb, RL and Rt are tied to Vcm for minimum power consumption and maximum output swing. Vcm Select Rt to yield desired Rin = Rt || Rg + - Figure 1: Non-Inverting Configuration Figure 2: Inverting Configuration |
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