ADL5906ACPZN-R7 datasheet(23/30 Pages) AD

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Data Sheet

ADL5906

THEORY OF OPERATION

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Rev. B | 23 of 30

VSET. Therefore, the values for R6 and R2 must be in the 1 kΩ to 5

kΩ range. Similar values must be used for R1 and R15.

It is also important to take into account part-to-part and frequency

variation in output swing along with the maximum output voltage

(3.9 V) of the output stage of the ADL5906. The VRMS part-to-part

distribution is well characterized at major frequency bands in the

Typical Performance Characteristics section (see Figure 12 through

Figure 14, Figure 18 through Figure 20, Figure 24, and Figure 25).

The resistor values in Table 6, which were calculated based on 3.5

GHz operation, have been conservatively chosen so that there is

no chance that the desired output voltage swings exceed the output

swing of the ADL5906 (when scaling upward) or the input range

of a 0 V to 2.5 V ADC (when scaling down-ward). In each case,

the nominal maximum voltage that results is 100 mV below the

desired maximum to account for part-to-part variation and resistor

tolerances.

Table 6. Output Voltage Range Scaling Examples at 3.5 GHz

Desired Input Range (dBm)

Slope Increase

Slope Decrease

New Slope (mV/dB)

Nominal Maximum Output Voltage (V)

R6 (Ω)

R2 (Ω)

R1 (Ω)

R15(Ω)

0 to −60

274

2000

3.8

−10 to −50

681

2000

3.8

0 to −60

787

2000

2.4

−10 to −50

348

2000

2.4

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