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ADRF6850BCPZ-R7 数据表(PDF) 25 Page - Analog Devices |
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ADRF6850BCPZ-R7 数据表(HTML) 25 Page - Analog Devices |
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25 / 36 page  ADRF6850 Rev. 0 | Page 25 of 36 within a suitable range to match the specification of the follow- on device. This is accomplished by setting Register CR29, Bit 6, to 0, and driving Pin 7, VOCM, with the requisite external bias voltage. Narrow-Band and Wideband Filter Mode By default, the second-order low-pass filter in the output buffers of the baseband output signal paths is selected, and the baseband outputs are in narrow-band mode. By setting Register CR29, Bits[5:4], this filter can be set to a cutoff frequency of 50 MHz, 43 MHz, 37 MHz, or 30 MHz. By setting Register CR29, Bit 3, to 1, this filter is bypassed and wideband mode is selected. Table 7. Baseband Filter Settings CR29[5:4] Filter Cutoff Frequency (MHz) 00 50 01 43 10 37 11 30 VGA Gain Mode Polarity The polarity of the VGA gain is set by programming Bit 2 of Register CR30. By setting Register CR30, Bit 2, to 0, a positive gain slope is selected where VGAIN = 0 V sets the VGA gain to be 0 dB, and VGAIN = 1.5 V sets the VGA gain to be 60 dB. By setting Register CR30, Bit 2, to 1, a negative gain slope is selected. |
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