1 Features

• Four channel DisplayPort 2.1 linear redriver or

repeater with integrated 2:1 MUX

• Supports embedded (eDP) and DisplayPort 2.1 up

to 20Gbps - RBR, HBRx, UHBRx

• Supports DP++ (also called an AC-coupled HDMI)

up to 24Gbps

• Protocol agnostic, linear equalizer supporting AC

coupled interfaces up to 24Gbps

• Single 3.3V supply

• Low 720mW active power for 4-channel operation

• Excellent electrical performance at 20Gbps

(10GHz Nyquist):

– 19dB equalization

– 1.8V DC linearity, 1.08V AC linearity

– -15dB / -16dB Rx / Tx return loss

– -60dB NEXT, -43dB FEXT crosstalk

– 70fs low additive RJ with PRBS data

• Low latency of 90ps

• Transparent to DisplayPort 1.4 and 2.1 link training

• Device configuration by pin control or SMBus / I2C

– 18EQ boost settings, 5 flat gain settings

• -40°C to 85°C temperature range

• 3.5 × 9mm 42 Pin 0.5mm pitch WQFN package

2 Applications

• Desktop PC and motherboard

• PC, notebooks, tablets

• Docking stations

• TV, gaming, home theater, and entertainment

• Pro audio, video, and signage

• Test and measurement

• Medical

• Flat panel monitors

3 Description

The TDP20MB421 is a 4-channel linear redriver

with an integrated 2:1 MUX. The low-power, highperformance

linear redriver is designed to support

DisplayPort 2.1 up to 20Gbps.

The TDP20MB421 receivers deploy continuous time

linear equalizers (CTLE) to provide a programmable

high-frequency boost. The equalizer opens an input

eye that is completely closed due to inter-symbol

interference (ISI) induced by an interconnect medium,

such as PCB traces. A CTLE receiver is followed

by a linear output driver. The linear data paths

of TDP20MB421 preserve the characteristics of

the transmit preset. High bandwidth, low channel-tochannel

crosstalk, low additive jitter, and excellent

return loss make the device almost a passive element

in the link. The DisplayPort link training is effective

through the device as the device becomes part of the

passive channel between the source Tx and sink Rx.

The device transparency in the link-training protocol

results in the best electrical link and lowest possible

latency. The data path of the device uses an internally

regulated power rail that provides high immunity to

supply noise on the board.

The TDP20MB421 implements high-speed testing

during production for reliable, high-volume

manufacturing. The device also has low AC and DC

gain variation, providing consistent equalization in

high-volume platform deployment.