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TL026CPSR Arkusz danych(PDF) 7 Page - Texas Instruments |
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TL026CPSR Arkusz danych(HTML) 7 Page - Texas Instruments |
7 / 18 page TL026C DIFFERENTIAL HIGH-FREQUENCY AMPLIFIER WITH AGC SLFS007A – JUNE 1985 – REVISED JULY 1990 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION The circuit values in Figures 6 and 7 will produce the best results in this general application. Because of rectification and device input constraints, the circuit in Figure 6 will not provide attenuation and has about 32 dB of control range. The circuit shown in Figure 7 will have approximately 25% variation in the peak output voltage limit due to the variation in gain of the TL592 device to device. In addition, if a lower output voltage is desired, the output of the TL026C can be used for approximately 40 mV of controlled signal. considerations for the use of the TL026C To obtain the most reliable results, RF breadboarding techniques must be used. A groundplane board should be used and power supplies should be bypassed with 0.1- µF capacitors. Input leads and output leads should be as short as possible and separated from each other. A peak input voltage greater than 200 mV will begin to saturate the input stages of the TL026C and, while the circuit is in the AGC mode, the output signal may become distorted. To observe the output signal of TL026C or TL592, low-capacitance FET probes or the output voltage divider technique shown in Figure 6 should be used. – + + – OUT + OUT – 0.1 µF 0.1 µF REF OUT 30 k Ω To Scope Monitor Vout 200 Ω 1.8 k Ω IN – IN + 50 Ω AGC 10 k Ω 10 k Ω VAGC A2 20 k Ω 50 Ω VI + – 10 k Ω A1 12 k Ω 1N914 D1 0.1 µF V1 1/2 TL082 1/2 TL082 TL026C NOTE: VCC + = 6 V and VCC – = – 6 V for TL026C and amplifiers A1 and A2. Figure 6. Typical Application Circuit With No Attenuation |
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