hi,
with refernce to the thread https://e2e.ti.com/support/rf-microwave/f/220/t/811606 we have some further questions on TRF3722 datasheet.
With regards to the figures 110-129:
- we assume that LO output buffer and LO div blocks are activated. Is that correct?
- an abrupt power dissipation (for +3.3V pwr supply) increase is depicted at figures 110-115 at frequencies approax 3GHz. However as noted in the data sheet, a constant Txdiv=1, Lo div=1 setup should be used for Fout=2050Mà 4100M. Can you clarify?
- figures 111 & 113 depict "+3.3V supply current vs supply, High gain mode”, with graphs labels “+3.3V, 5V”. To which power supply rail the “5V” refers to? Does the total Icc_3.3V depends on any other power supply rail Icc (ex. Vcc_tk)?
- figure 115 depicts "5V supply current vs supply, low power mode”. However as specified in the data sheet the typ Icc_Tk=21mA and not >200mA as the graph depicts. Can you clarify?
- figures 119, 121 and 123 depict "3.3V Pdiss vs supply” with labels “+3.3V, 5V”. To which power supply rail the “5V” refers to?
And, most critical, regarding Vcc_tk: what is the possible VCO open loop degradation if we use Vcc_tk=3.3V instead of +5V?
Would you recommend such approach?
thanks a lot in advance
KR
Vincenzo