JAJSMF0B July 2021 – February 2024 LMX1204
PRODUCTION DATA
The LOGISYSREFOUT output supports the three formats of LVDS, LVPECL, and CML. The LOGISYSREFOUT_EN enables the output buffer and LOGISYSREF_FMT sets the format. LVDS mode allows programmable common mode, LVPECL and CML require external components, and CML allows programmable output power (see Table 6-10).
LOGISYSREFOUT_EN | LOGISYSREF_FMT | LOGISYSREF FORMAT | EXTERNAL TERMINIATION REQUIRED | OUTPUT POWER | OUTPUT COMMON MODE |
---|---|---|---|---|---|
0 | Powered Down | ||||
1 | 0 | LVDS | None | Fixed | Programmable with LOGISYSREF_VCM |
1 | LVPECL | Emitter Resistors | Fixed | Fixed | |
2 | CML | Pullup resistors 50 Ω to VCC |
Controlled by LOGISYSREF_PWR | LOGISYSREF_VCM has no impact, but this changes with LOGISYSREF_PWR. | |
3 | Reserved |