Other Parts Discussed in Thread: LMH0397
Hello!
I use LMH0318 in my development. The HD-SDI signal with an impedance of 100 Ohms is input to IN0 of this chip. Wire length from the camera to LMH0318 20 cm.
Code for initialization:
writeRegister(0xFF, 0x04, 0x07); //Select Channel Registers
writeRegister(0x16, 0x25, 0xFF); //Enable Full Temperature Range
writeRegister(0x3E, 0x00, 0x80); //Initialize CDR State Machine Control
writeRegister(0x55, 0x02, 0x80);
writeRegister(0x6A, 0x00, 0xFF);
writeRegister(0x03, 0x80, 0xFF);
writeRegister(0x0A, 0x0C, 0x0C); //Reset CDR
writeRegister(0x0A, 0x00, 0x0C); //Release CDR reset
writeRegister(0x31, 0x03, 0x03); //Select IN1*/
writeRegister(0x0A, 0x0C, 0x0C); //Reset CDR
writeRegister(0x0A, 0x00, 0xC); //Release CDR reset
writeRegister(0xFF, 0x04, 0x07); //Select Channel Registers
writeRegister(0x09, 0x20, 0x20);//Enable over-ride
writeRegister(0x1C, 0x80, 0xE0);//OUT0 Retimed Data
writeRegister(0x1C, 0x00, 0x0C);
Read_HEO_VEO();
readRegister(0x02);
With these settings, I get an output signal:
HEO-52dec (81% open)
VEO-152dec (475mV)
Reg 0x02 - 11: CDR locked.
In Pin16 “LOCK”- High.
The device is operating normally.
Problems begin when I try to connect a 30-meter wire from the camera to LMH0318. The program code does not change. The following parameters are changed:
Reg 0x02 - 00: CDR not locked.
In Pin16 “LOCK”- Low.
The video signal is not received at the OUT0. But the device recognizes that the input signal has arrived.
LOS_INT_N –Low.
I tried different settings Boost, but not help.
What could be the problem? Thank you!