ADL6331ACCZB-R7 datasheet(27/54 Pages) AD

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Data Sheet

ADL6331

THEORY OF OPERATION

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Rev. B | 27 of 54

The ADL6331 integrates two amplifiers with fixed gain (AMP1 ≈ 12

dB and AMP2 ≈ 10 dB) and a DSA, which is adjustable from 0

dB to 24 dB in 1 dB step. The AMP1 and AMP2 have a bypass

attenuation mode, which allows the user to disable these amplifiers

individually and route the RF signals through the fixed 12 dB

attenuators. When an amplifier is configured in the bypass attenua-

tion mode, the gain drops by approximately 24 dB for AMP1 and

22 dB for AMP2 (Δ gain from AMP enabled to bypass attenuation

mode), which enables an overall gain control range of 70 dB in 1 dB

step when used with the 24 dB DSA.

Additionally, in the bypass attenuation mode, the current of the

amplifiers drops to almost zero.

All circuit blocks of the ADL6331 as shown in Figure 93 are

programmable via the SPI.

RF INPUT AND OUTPUT

The ADL6331 input impedance is 50 Ω differential, and the output

impedance is 50 Ω single-ended, which provides an interface from

RF DACs with a 50 Ω differential output impedance to a 50 Ω

singled-ended PA in a signal chain without any matching networks.

ADL6331ACCZB-R7 Datasheet(PDF) 27 Page - Analog Devices