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ADL6331ACCZA-R7 bảng dữ liệu(PDF) 27 Page - Analog Devices |
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ADL6331ACCZA-R7 bảng dữ liệu(HTML) 27 Page - Analog Devices |
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27 / 54 page ![]() Data Sheet ADL6331 THEORY OF OPERATION analog.com 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. |
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