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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AD8352ACPZ-R7 Datenblatt(PDF) 11 Page - Analog Devices |
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AD8352ACPZ-R7 Datenblatt(HTML) 11 Page - Analog Devices |
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11 / 20 page  AD8352 Rev. 0| Page 11 of 20 APPLICATIONS Table 7. Broadband Selection of RG, CD, and RD: 1 kΩ Load GAIN AND DISTORTION ADJUSTMENT (DIFFERENTIAL INPUT) AV (dB) RG (Ω) CD (pF) RD (kΩ) 3 750 0 (DNP) 6.8 Table 6 and Table 7 show the required value of RG for the gains specified at 200 Ω and 1 kΩ loads. Figure 20 and Figure 22 plot RG vs. gain up to 18 dB for both load conditions. For other output loads (RL), use Equation 1 to compute gain vs. RG. ()( ) L L G G ial VDifferent R R R R A ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + + + = 430 53 5 500 (1) where: RL = single-ended load. RG = gain setting resistor. The third-order harmonic distortion can be reduced by using external components RD and CD. Table 6 and Table 7 show the required values for RD and CD vs. the specified gains to achieve (single tone) third-order distortion reduction at 180 MHz. Figure 21 and Figure 23 show CD vs. any gain (up to 18 dB) for 200 Ω and 1 kΩ loads, respectively. When these values are selected, they result in minimum single tone, third-order distortion at 180 MHz. This frequency point provides the best overall broadband distortion for the specified frequencies below and above this value. For applications above approximately 300 MHz, CD and RD are not required. See the Specifications section and third-order harmonic plots in the Typical Performance Characteristics section for more details. CD can be further optimized for narrow-band tuning requirements below 180 MHz that result in relatively lower third-order (in-band) intermodulation distortion terms. See the Narrow-Band, Third-Order Intermodulation Cancellation section for more information. Though not shown, single tone, third-order optimization can also be improved for narrow-band frequency applications below 180 MHz with the proper selection of CD, and 3 dB to 6 dB of relative third-order improvement can be realized at frequencies below approximately 140 MHz. Using the information listed in Table 6 and Table 7, an extrapolated value for RD can be determined for loads between 200 Ω and 1 kΩ. For loads above 1 kΩ, use the 1 kΩ RD values listed in Table 7. Table 6. Broadband Selection of RG, CD, and RD: 200 Ω Load AV (dB) RG (Ω) CD (pF) RD (kΩ) 3 390 0 (DNP) 6.8 6 220 0 (DNP) 4.3 9 140 0.1 4.3 10 115 0.2 4.3 12 86 0.3 4.3 15 56 0.6 4.3 18 35 1 4.3 6 360 0 (DNP) 6.8 9 210 0 (DNP) 6.8 10 180 0.05 6.8 12 130 0.1 6.8 15 82 0.3 6.8 18 54 0.5 6.8 20 0 0 400 RG (Ω) 18 16 14 12 10 8 6 4 2 100 200 300 50 150 250 350 Figure 20. RG vs. Gain, RL = 200 Ω 20 0 0 CD (pF) 18 16 14 12 10 8 6 4 2 0.2 0.4 0.6 0.8 1.0 0.1 0.3 0.5 0.7 0.9 Figure 21. CD vs. Gain, RL = 200 Ω |
Ähnliche Teilenummer - AD8352ACPZ-R7 |
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Ähnliche Beschreibung - AD8352ACPZ-R7 |
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