Part Number: LMH1219
Other Parts Discussed in Thread: TIDA-00428,
Dear Team,
I have one SDI to Optical desing same as TIDA-00428 referance desing,
i have some issue when i connect 6G-SDI camera on my POC board .
6G-SDI input from camera to LMH1219 not working - HEO and VEO - 0 so issue at Out0 not matching eye diagram requirement .
when i connect PC monitor with 3840x2160 HDMI to 6G-SDI converter and to LMH1219 its workgin and gives proper HEO and VEO reading and all work .
some time it gives short flicker on video .
any idea what could be the reason ?
i have simple configuration
//////////////////////Select IN0 and override pins/////////////////
// CTLE/CDR page
lmh1219_i2c_write(0xFF, 0x04);
// Override IN_OUT_SEL → force IN0
lmh1219_i2c_write(0x3F, 0x10);
// Override OUT_CTRL
lmh1219_i2c_write(0x3F, 0x08);
// Override reference rate
lmh1219_i2c_write(0x3F, 0x04);
// Enable IN0 → OUT0 only
lmh1219_i2c_write(0x31, 0x01);
//////////////////////
//////////////Enable OUT0 driver/////////////
// CableEQ/Driver page
lmh1219_i2c_write(0xFF, 0x05);
// OUT0 power‑down override ON
lmh1219_i2c_write(0x31, 0x20);
// OUT0 enabled (power‑down = 0)
lmh1219_i2c_write(0x31, 0x00);
///////////////////////////////////////////////
/////////////////////////////////Reset Cable EQ acquisition/////////////
lmh1219_i2c_write(0x19, 0x04);
lmh1219_i2c_write(0x19, 0x00);
//////////////////////////////////////////////////////////////
////////////OUT0 tuning (VOD + DEM)///////////////////////
// Still on page 0x05
// ---- VOD = 7 (max) ----
uint8_t r30;
lmh1219_i2c_read(0x30, &r30);
r30 |= (1 << 5); // VOD override enable
r30 = (r30 & ~0x07) | 0x07;
lmh1219_i2c_write(0x30, r30);
// ---- DEM = 0 dB ----
uint8_t r31;
lmh1219_i2c_read(0x31, &r31);
r31 |= (1 << 6); // DEM override enable
r31 = (r31 & ~0x07) | 0x00;
lmh1219_i2c_write(0x31, r31);
///////////////////////////////////////////////////
/////////////Enable reclocked data on OUT0/////////////////////
// CTLE/CDR page
lmh1219_i2c_write(0xFF, 0x04);
// Reclocked data on OUT0/OUT1
lmh1219_i2c_write(0x1C, 0x08);
// SMPTE lock enable
lmh1219_i2c_write(0x2F, 0x00);
// Reset CDR
lmh1219_i2c_write(0x0A, 0x0C);
// Release CDR reset
lmh1219_i2c_write(0x0A, 0x00);
/////////////////////////////////////////////
/////////////Disable EQ bypass//////////////
// CableEQ/Driver page
lmh1219_i2c_write(0xFF, 0x05);
// Disable EQ bypass override
lmh1219_i2c_write(0x27, 0x00);
////////////////////////////////////////////
lmh1219_i2c_write(0x33, 0x30); //Power down OUT1
////////////////////////////////////////////
any idea about the issue ?
