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TL026CDRG4 数据表(PDF) 6 Page - Texas Instruments |
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TL026CDRG4 数据表(HTML) 6 Page - Texas Instruments |
6 / 18 page TL026C DIFFERENTIAL HIGH-FREQUENCY AMPLIFIER WITH AGC SLFS007A – JUNE 1985 – REVISED JULY 1990 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Amplifier A2 inverts V1 producing a positive AGC signal voltage. Therefore, the input voltage to the TL026C AGC pin consists of an AGC signal equal to: (6) R2 R1 V C and a dc voltage derived from Vref, defined as the quiescent value of VAGC. V AGC (q) + 2 R6 R5 ) R6 V ref (7) For the initial resistor calculations, Vref is assumed to be typically 1.4 V making quiescent VAGC approximately 1.22 V (VAGC(q) = Vref – 180 mV). This voltage allows the TL026C to operate at maximum gain under no-signal and low-signal conditions. In addition, with Vref used as both internal and external reference, its variation from device to device automatically adjusts the overall bias and makes AGC operation essentially independent of the absolute value of Vref. The resistor divider needs to be calculated only once and is valid for the full tolerance of Vref. output voltage limits (see Figures 6 and 7) The output voltage level desired must fall within the following limits: 1. Because the data sheet minimum output swing is 3 V peak-to-peak using a 2-k Ω load resistor, the user-selected design limit for the peak output swing should not exceed 1.5 V. 2. The voltage drop of the rectifying diode determines the lower voltage limit. When a silicon diode is used, this voltage is approximately 0.7 V. The output voltage VO must have sufficient amplitude to exceed the rectifying diode drop. Aschottky diode can be used to reduce the VO level required. gain calculations for a peak output voltage of 1 V A peak output voltage of 1 V was chosen for gain calculations because it is approximately midway between the limits of conditions 1 and 2 in the preceding paragraph. Using equation 3 (VC = VOP – Vd), VC is calculated as follows: VC = 1 V – 0.7 V VC = 0.3 V Therefore, the gain of A1 must produce a voltage V1 that is equal to or greater than the total change in VAGC for maximum TL026C gain change. With a total change in VAGC of 360 mV and using equation 4, the calculation is as follows: * V1 V C + DV AGC V C + R2 R1 + 0.36 0.3 + 1.2 If R1 is 10 k Ω, R2 is 1.2 time R1 or 12 kΩ. Since the output voltage for this circuit must be between 0.85 V and 1.3 V, the component values in Figures 6 and 7 provide a nominal 1-V peak output limit. This limit is the best choice to allow for temperature variations of the diode and minimum output voltage specification. |
类似零件编号 - TL026CDRG4 |
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类似说明 - TL026CDRG4 |
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