SNAS783C June 2020 – February 2021 LMX2820
PRODUCTION DATA
If fractional spurs are a large concern, using a ferrite bead to each of these power supply pins can reduce spurs to a small degree. This device has integrated LDOs, which improves the resistance to power supply noise. This device can be powered by an external DC-DC buck converter, such as the TPS62150. For the purposes of power supply filtering, it is useful to have a general idea of how much current goes through different pins. This may change significantly with configuration, but the following table gives a good idea.
Conditoin | Total | VCCDIG | VCCCP | VCCMASH | VCCBUF | VCCVCO |
---|---|---|---|---|---|---|
One direct RF Output | 420 | 23 | 5 | 5 | 124 | 263 |
One divided RF Output | 580 | 21 | 13 | 96 | 212 | 238 |
One RF output with VCO doubler enabled | 590 | 20 | 12 | 89 | 238 | 231 |
RFIN External Feedback Mode, Internal VCO | 530 | 18 | 12 | 90 | 170 | 240 |
PFDIN External Feedback Mode, Internal VCO | 455 | 18 | 10 | 79 | 110 | 238 |
External VCO Mode | 290 | 19 | 9 | 92 | 54 | 116 |
Power-on reset current | 234 | 10 | 6 | 48 | 24 | 146 |
Power-down current | 10 | 2 | 0 | 1 | 6 | 1 |