ADMV1455BBCZ-R7 datasheet(81/141 Pages) AD

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Data Sheet

ADMV1455

THEORY OF OPERATION

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Rev. 0 | 81 of 141

IF TUNABLE BPF

The IF signal chain contains a tunable BPF to help reject unwanted

IF frequencies and optimize IF output power flatness. The tunable

BPF has a typical bandwidth of 4GHz and includes both coarse and

fine adjustabilities.

Set Register 0x2A2, Bit 4, to 1 to enable the fine adjust of

the tunable BPF. The fine adjust value is then set by Register

0x2A2, Bits[3:0]. The coarse adjust is set by either Register 0x804,

Bits[3:2], or the frequency LUT.

There are two additional controls that impact the IF signal chain

performance, the IF resistor calibration and the IF subband. The

IF resistor calibration is enabled by Register 0x188, Bit 3, and the

value is determined by Bits[2:0]. The IF subband is determined by

with the BPF coarse adjust value based upon the desired IF center

frequency.

Refer to Table 24 for guidance on setting the tunable BPF based

upon the desired IF center frequency. Depending upon the appli-

cation requirements for gain flatness and rejection, further small

changes to the BPF fine adjust value can be beneficial.

Table 24. IF Tunable BPF Recommended Settings

Frequency

IF Resistor Calibration,

IF Subband,

Coarse Adjust,

Fine Adjust,

4GHz

0xC

0x3

0x1F

6GHz

0xE

0x1

0x0

0x1D

8GHz

0xE

0x0

0x12

10GHz

0xE

0x0

0x10

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