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ADL5566ACPZ-R7 Datasheet(PDF) 17 Page - Analog Devices |
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ADL5566ACPZ-R7 Datasheet(HTML) 17 Page - Analog Devices |
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17 / 24 page ![]() Data Sheet ADL5566 Rev. C | Page 17 of 24 To find RSERIES for a given AV gain and RL, use the following: RSERIES = 80 10 500 − + L L V R R A (3) To calculate the AV gain for a given RSERIES and RL, use the following: + × + = L L SERIES GAIN R R R A 10 80 500 (4) –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1M 10M 100M 1G 10G FREQUENCY (Hz) Figure 42. SDD21, VPOS = 3.3 V, Three Gains, 25°C The necessary shunt component, RSHUNT, to match to the source impedance, RS, can be expressed with the following: 160 2 1 1 1 + − = SERIES S SHUNT R R R (5) The voltage gain for multiple shunt resistor values are summarized in Table 5. The source resistance and input impedance need careful attention when using Equation 5. The reactance of the input impedance of the ADL5566 and the ac coupling capacitors must be considered before assuming that they make a negligible contribution. –120 –115 –110 –105 –100 –95 –90 –85 –80 –75 –70 –65 –60 –55 –50 0 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) HD2 3.3V HD3 3.3V IMD 3.3V HD2 5V HD3 5V IMD 5V Figure 43. IMD, HD2, and HD3 vs. Frequency, AV = 6 dB, 2 V p-p Output, VPOS = 3.3 and VPOS = 5 V Table 5. Differential Gain Adjustment Using Series Resistor Target Gain (dB) Actual Gain (dB) RS (Ω) RSERIES (Ω)1 RSHUNT (Ω)1 0 −0.1 50 396.2 52.8 1 +1.2 50 344.4 53.1 2 +2.1 50 298.3 53.5 3 +2.9 50 257.1 54 4 +4.1 50 220.5 54.5 5 +5.1 50 187.8 55.1 6 +6.1 50 158.7 55.8 7 +6.9 50 132.7 56.7 8 +8.1 50 109.6 57.6 9 +8.9 50 89 58.7 10 +10 50 70.6 60 11 +11.1 50 54.2 61.4 12 +12 50 39.6 63.2 13 +12.8 50 26.6 65.3 14 +14 50 15 67.9 15 +15.1 50 4.8 70.9 16 +15.8 50 0 72.7 1 The resistor values are rounded to the nearest real resistor value. |
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