JAJSMF0B July 2021 – February 2024 LMX1204
PRODUCTION DATA
In many cases, not all pins are needed. Table 8-4 gives recommendation on handling of these unused pins.
PIN(S) | TREATMENT |
---|---|
All Vcc Pins |
These pins must always be connected to the supply. If the block that this powers (as implied by the pin name) is not used, then the bypassing can be minimized or eliminated. |
SYSREFREQ |
If driving single-ended AC coupled, the complimentary input must have a AC-coupling capacitor to ground. If driving single-ended DC coupled, complimentary input must be externally biased at required VCM with Thevenin’s equivalent. If using continuous SYSREF Generator mode, these pins can be either used to turn the output buffers on and off or they can be left floating. If left floating, use SYSREFREQ_SPI to control the output gating. If not using SYSREF at all, pins can be left open. |
CLKIN Complementary Input | If driving single-ended, the complementary input must have a AC-coupling capacitor and 50 Ω to ground. |
BIAS01 and BIAS23 | These pins can be left open if multiplier is not used. |
CLKOUT SYSREFOUT LOGICLKOUT LOGISYSREFOUT |
These pins can be left open if not used. |