Q3. The LMH1983 datasheet (P29) insists that the device automatically adjust charge pomp current
corresponding to the reference divider.
Can you change the Charge pomp current by writing Address 0x28 Bit[4:0]?
If so, in this mode, does customer have to change Charge pomp current depending on reference divider value?
How can you get back to auto mode?
Q4. The datasheet mentions about TOF1 control (page 14)
The default values of TOF1_Sync_Near is ‘1’ (Crash lock) and TOF1_Sync_Far is ‘0’.(Drift lock)
From natural feeling, the default setting should be opposite (Near=Drift and Far=Crash)
When customer set them opposite to the defaults, LMH1983 behaved unexpected way (hard to explain)
It is suspected that the description of bit may be swapped.
Can you please check if the description of the datasheet describe the IC designed or not?
Q5. The input named “INIT” (rising edge) force the device to set the initial frame of five audio cadence.
Does it means that the rising edge of INIT specifies the start of audio frame or first frame after
Rising edge of INIT specifies the start of audio frame?
Q6. The reference design or evaluation board set 1.2V as the bias of negative input of the differential clock
input XOIN-
In contrast, the comment on the schematic diagram of the evaluation board insists bellows.
The VCXO used on the EVK may have 3.3V LVCOMS. So, 1.6V may be used.
Can you let me know why 1.2V bias is used instead of 1.6V?
-LVCMOS (default):
XOin+: Connect to VCXO's single-ended output.
XOin-: Bias to 1.65VDC via 1.00k divider resistors using the
