Short-Form Datasheet
HXT14450
56Gbps – Linear PAM4 VCSEL Driver with CDR
The HXT14450 is a quad-channel, low power, linear
vertical-cavity surface-emitting laser (VCSEL) driver
with an integrated clock and data recovery (CDR)
unit. The chip is designed for MMF PMD Short-
Reach applications that support 200G per port with
a signaling rate up to 56Gbps PAM4 modulation. In
conjunction with the HXR14450 – a quad-channel
transimpedance amplifier (TIA) receiver with an
integrated CDR, one can produce compact quad
small form factor QSFP-type modules to serve high
speed optical interconnects in data center
Features
Quad 56Gb/s PAM4 VCSEL Driver integrated
with a low latency CDR
Low power – typical 490 mW per channel
Supports up to 11mA modulation current to
VCSEL
Programmable 8-bit IMOD and IBIAS control
Auto-Adaptive CTLE and DFE
Support reference-less and reference clock
modes
applications.
On-chip testability: eye opening monitor (EOM),
jitter tolerance (JTOL), PRBS generator, error
checker
The HXT14450 has a built-in auto-adaptive
continuous-time linear equalizer (CTLE) and a
decision-feedback equalizer (DFE), which can work
in chip-to-module and chip-to-chip interconnects.
The chipsets provide on-chip testability such as
PRBS generator and error checker.
Integrated temperature sensor
Input and output polarity inversion
Programmable TX test pattern generation
TX Disable, programmable loss of signal (LOS)
and output de-emphasis
Applications
200G QSFP56 SR4 and 400G QSFP-DD or
OSFP SR8 Ethernet Modules and AOC
I2C interface control: standard and fast modes
400G OBO Modules
Support CEI-56G-VSR-PAM4
Figure 1. Block Diagram
X0010044 Rev.1.0
Dec.7.20
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