ADRF6620ACPZ-R7 datasheet(30/52 Pages) AD

30 / 52 page

ADRF6620

Data Sheet

Rev. 0 | Page 30 of 52

RF INPUT BALUN INSERTION LOSS OPTIMIZATION

As shown in Figure 71 to Figure 74, the gain of the ADRF6620

mixer has been characterized for every combination of BAL_CIN

and BAL_COUT (Register 0x30). As shown, a range of BAL_CIN

and BAL_COUT values can be used to optimize the gain of the

ADRF6620. The optimized values do not change with temperature.

After the values are chosen, the absolute gain changes over tem-

perature; however, the signature of the BAL_CIN and BAL_COUT

values is fixed.

–6

–5

–4

–3

–2

–1

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

BAL_CIN/BAL_COUT

BAL_COUT

BAL_CIN

–40°C

+25°C

+85°C

Figure 71. Gain vs. BAL_CIN and BAL_COUT at RF = 900 MHz

–12

–10

–8

–6

–4

–2

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

BAL_CIN/BAL_COUT

–40°C

+25°C

+85°C

BAL_COUT

BAL_CIN

Figure 72. Gain vs. BAL_CIN and BAL_COUT at RF = 2100 MHz

At lower input frequencies, more capacitance is needed. This

increase is achieved by programming higher codes into BAL_CIN

and BAL_COUT. At high frequencies, less capacitance is required;

therefore, lower BAL_CIN and BAL_COUT codes are appropriate.

Table 16 provides a list of recomended BAL_CIN and BAL_COUT

codes for popular radio frequencies. Use Figure 71 to Figure 74

and Table 16 only as guides; do not interpret them in the absolute

sense because every application and PCB design varies. Addi-

tional fine-tuning may be necessary to achieve the maximum gain.

–10

–9

–4

–

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

BAL_CIN/BAL_COUT

BAL_COUT

BAL_CIN

–40°C

+25°C

+85°C

Figure 73. Gain vs. BAL_CIN and BAL_COUT at RF = 1900 MHz

–18

–14

–10

–6

–2

–16

–12

–8

–4

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

BAL_CIN/BAL_COUT

BAL_COUT

BAL_CIN

–40°C

+25°C

+85°C

Figure 74. Gain vs. BAL_CIN and BAL_COUT at RF = 2700 MHz

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