25G LASER Transceiver Combo IC
Benefits and Features
▪ 25 Gbps LASER Driver & Limiting Amplifier with
dual CDRs and integrated microcontroller
▪ External directly modulated laser driver for DC
coupled passive 25G TOSAs
▪ Dual reference-free CDRs with programmable PLL
bandwidth and bypass mode
▪ Embedded μ8051 core microcontroller with
programmable non-volatile memory and SRAM
▪ Host I2C slave interface and SPI/I2C master
▪ Integrated auto-ranging ADC for digital monitor
reporting supporting SFF-8472
▪ +3.3V, core +1.3V, and Tx output supplies
▪ -40°C to +95°C case operating temperature
25 Gbps Transmitter
▪ LASER: 70 mA bias, 80 mA mod (25G Flex-TOSA)
▪ Programmable adaptive CTLE input equalizer
▪ Tx output eye shaping
▪ Integrated digital automatic power control
▪ Comprehensive Laser eye safety logic
▪ Tx output supply for laser biasing
25 Gbps Receiver
▪ Input Sensitivity: 10 mV p-p typical
▪ Programmable input equalizer
▪ 25GAUI compliant output with programmable
output swing, squelch and de-emphasis
▪ RSSI and OMA based LOS
General Description
The HLC28L1 is a 25 Gbps DML laser driver, limiting post amplifier, dual CDR with integrated MCU and memory designed in an advanced CMOS process.
The HLC28L1 transmitter section includes a 25GAUI compliant input stage with adaptive equalisation, CDR, and programmable output eye shaping control and an integrated digital mean power controller (APC).
The HLC28L1 receiver limiting amplifier section has a high sensitivity input supporting a wide range of ROSAs, together with digitally configurable input equalisation, CDR, and a 25GAUI output stage with configurable pre-emphasis to deliver optimum system performance.
The HLC28L1 integrates all major functions to implement a DDMI compliant SFP28 transceiver with minimal additional external components: Auto-ranging ADCs, on-chip 8051 MCU, nonvolatile memory, and embedded firmware.
The HLC28L1 has an operating temperature range from -40°C to +95°C and is packaged in a compact chip-scale 4mm x 4mm ball grid array package.
Applications
▪ SFP28 LR Transceivers (SFF-8419 & SFF-8472)
▪ 24G CPRI Wireless front/back-haul
▪ 25GbE LR & LR Lite
