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AD8352ACPZ-WP Datasheet(PDF) 11 Page - Analog Devices |
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AD8352ACPZ-WP Datasheet(HTML) 11 Page - Analog Devices |
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11 / 20 page  AD8352 Rev. B | Page 11 of 20 APPLICATIONS INFORMATION GAIN AND DISTORTION ADJUSTMENT (DIFFERENTIAL INPUT) Table 5 and Table 6 show the required value of RG for the gains specified at 200 Ω and 1 kΩ loads. Figure 22 and Figure 24 plot gain vs. RG 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 al Differenti V R R R R A ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + + + = 430 53) ( 5) ( 500 (1) where RL is the single-ended load. RG is the gain setting resistor. The third-order harmonic distortion can be reduced by using external components RD and CD. Table 5 and Table 6 show the required values for RD and CD for the specified gains to achieve (single tone) third-order distortion reduction at 180 MHz. Figure 23 and Figure 25 show any gain (up to 18 dB) vs. CD 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 broad- band distortion for the specified frequencies below and above this value. For applications above ~300 MHz, CD and RD are not required. See the Specifications section and the third-order harmonic plots for more details (see Figure 12, Figure 14, and Figure 15). 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 5 and Table 6, 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 6. Table 5. Broadband Selection of RG, CD, and RD, 200 Ω Load AV (dB) RG (Ω) CD (pF) RD (kΩ) 3 390 Open 6.8 6 220 Open 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 Table 6. Broadband Selection of RG, CD, and RD, 1 kΩ Load AV (dB) RG (Ω) CD (pF) RD (kΩ) 3 750 Open 6.8 6 360 Open 6.8 9 210 Open 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 22. Gain vs. RG, 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 23. Gain vs. CD, RL = 200 Ω |
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