HXT14400 28G Linear PAM4 VCSEL Driver Short-Form Datasheet Description Features The HXT14400 is a quad-channel, low power, 230mW per channel power dissipation typical Linear PAM4 VCSEL driver for SR optical = 12mA and I = 12mA Supports up to: IMOD PP BIAS applications that supports signaling rates up to with V = 3.3V CC 28Gbaud or 56Gbps PAM4. In conjunction with Integrated 12-bit ADC with 6 channel analog an individual DFB laser diode, the device handles multiplexor front-end the complete digital-to-optical conversion, Programmable 8-bit Laser Modulation and including CML input with equalization, laser Bias current control driver, drive control and supervision. Integrated Bias Monitor, Transmit and Receive Power Monitor capability The HXT14400 also integrates a number of Automatic Power Control (APC) functions required for Automatic Power Control Programmable input LOS and squelch (APC), as well as internal and module function with disable, transmit disable, and temperature measurements and reporting. transmit fault indication Using the included RSSI input, the module Programmable input CTLE equalization receive optical power can also be measured and Integrated temperature sensor and input for reported. external module temperature sensor Designed for direct DC-coupled die in TOSA Interrupts with user selectable mask control applications with a small number of additional Input polarity inversion components for cost-effective and compact Laser disable for I and I MOD BIAS assemblies. Available in die form. Integrated OTP for calibration Typical Applications 2-wire interface control 200G QSFP56 Ethernet modules for datacenter application 400G CFP8 Ethernet SR16 Fiber channel modules Infiniband EDR optical modules Ordering Information Part Temperature Range Dimensions 1 HXT14400-DNU -5C to +95C Nominal Die Size: 1650 x 2370 m 2 HXT14400-TNU HXT14400-EVB Room Temp Evaluation Board 1 2 Notes: Product Shipping Carrier Type: Waffle Pack Blue Tape For price, delivery schedules, and to place orders, please contact IDT: www.IDT.com/go/sales 2017 Integrated Device Technology, Inc. 1 December 13, 2017 HXT14400 Short-Form Datasheet Device Diagram I / I Control BIAS MOD DFT BIST EN IB IAS IM OD OSC 8bits 8bits VCCO LN AP Linear DFT DML Output Input Buffer Buffer / Pre - Driver MUX Stage Gain Adjust AN GNDO GNDO Loss of EQ 4bits POL INV GAIN 8bits EF I 2bits Fault Detect Signal TX LOS V FAIL Sense EQ / Polarity Control Gain / Eye Shaping Control Detect I BIAS LOS A 4bits BIAS MON MPD MON MPDP LOS D 4bits I MPD PWR MON APC Control RESET Registers / ADC VCC ADC Digital MUX TSENSP 12bit T SENSE INT SDA Diagnostics T SENSE EXT 2 TSENSN I C Slave Registers SCL RSSI Interface RSSI I-V OSC Convertor TX DIS LASER SAFETY and OTP CONTROL LOGIC 2 TX FAULT 128 bits I C ADDR b1:b0 RSSI IN INT Figure 1: Functional Block Diagram of a Single Channel 2017 Integrated Device Technology, Inc. 2 December 13, 2017 CTLE