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ISL55020IRZ Fiches technique(PDF) 8 Page - Intersil Corporation |
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ISL55020IRZ Fiches technique(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 FN6287.0 December 18, 2006 Description of Operation and Application Information Product Description The ISL55020 is a full differential Current Feedback Amplifier (CFA) featuring wide bandwidth and low power. The device contains a pair of high impedance differential inputs and a pair of differential outputs. It can be used in any combination of single/differential ended input/output configurations. A wide bandwidth unity gain, common mode amplifier with a 100MHz -3dB bandwidth (Figure 6) is included to provide DC offset correction or common mode signal injection to the differential output. The ISL55020 is internally compensated for single-ended closed loop gain (AVS), differential closed gain (AVD) of 2, or greater. Connected in differential gain of 5 (single ended gain of ±2.5 and driving a 200 Ω differential load, the ISL55020 has a - 3dB bandwidth of 300MHz. Driving a 200 Ω differential load at gain of 10, the bandwidth is about 200MHz (Figure 3). The ISL55020 is available with a power down feature (EN) to reduce the power while the amplifier is disabled. Input, Output, and Supply Voltage Range The ISL55020 is designed to operate with dual supplies over a range of +/-2.25V to +/-6V and can also operate with a single supply over the range of 4.5V to 12V. For single supply operation, the V- and GND pins must be connected together as close to the device as possible. The amplifiers have an input common mode voltage range from -4.3V to 3.4V when operated from ±5V supplies. The differential mode input range (DMIR) between the two inputs is from - 2.3V to +2.3V. The input voltage range at the VCM pin is from -3.3V to 3.7V. If the input common mode or differential mode signal is outside the above-specified ranges, the output signal will be distorted. The output of the ISL55020 can swing from -3.8V to +3.8V at 100 Ω differential load at ±5V supply. As the load resistance becomes lower, the output swing is reduced. Single-ended, Differential and Common Mode Gain Settings The ISL55020 can be used as a single/differential ended to differential/single converter. The voltage applied at VCM pin sets the output common mode voltage and the common mode gain is fixed at gain is one (AVCM = 1). The output differential voltage is given by the following: Where: RF1 = RF2 = RF The differential output gain (AVD) is defined by the feedback resistors according to the following The single ended output voltage (VOS) contains a common mode component (VCM) and a differential mode component equal to one-half the differential output (VOD/2)., and is given by the following: and the single-ended gain becomes: FIGURE 18. BASIC APPLICATION CIRCUIT VOUT+ FB+ RG RF2 IN+ IN- FB- VIN+ VIN- RF1 VOUT - VCM RIN- RIN+ RL+ RL- +1 OUT+ OUT- RT- RT-VCM RT+ V+ V- VCM GND- EN V+ V- GND- EN RS+ RS+ VOD = (VIN+ - VIN-) x (1 + 2RF/RG) (EQ. 1) AVD = 1 + 2RF/RG (EQ. 2) VOS = VOD/2 + VCM = VCM +(VIN+ - VIN-) x (0.5 + RF/RG) (EQ. 3) AVS = 0.5+ RF/RG (EQ. 4) ISL55020 |
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Description similaire - ISL55020IRZ |
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