Buffered 2:1 TMDS Switch

with Equalization

AD8194

Rev. 0

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FEATURES

2 inputs, 1 output HDMI/DVI high speed signal switch

Pin-to-pin compatible with the AD8193

Enables HDMI 1.3-compliant receiver

4 TMDS channels per input/output

Supports 250 Mbps to 2.25 Gbps data rates

Supports 25 MHz to 225 MHz pixel clocks

Fully buffered unidirectional inputs/outputs

Equalized inputs for operation with long HDMI cables

(20 m at 2.25 Gbps)

Matched 50 Ω input and output on-chip terminations

Low added jitter

Single-supply operation (3.3 V)

Standards compliant: HDMI receiver, DVI

32-lead, 5 mm × 5 mm, RoHS-compliant LFCSP

APPLICATIONS

Advanced television (HDTV) sets

Multiple input displays

Projectors

A/V receivers

Set-top boxes

FUNCTIONAL BLOCK DIAGRAM

AD8194

CONTROL

LOGIC

+4

4

–

+

–

+

–

4

4

4

4

Tx

SWITCH

CORE

HIGH SPEED

BUFFERED

VTTO

VTTI

IP_A[3:0]

IN_A[3:0]

IP_B[3:0]

IN_B[3:0]

VTTI

S_SEL

OP[3:0]

ON[3:0]

AVCC AVEE

EQ

Figure 1.

TYPICAL APPLICATION

HDMI

RECEIVER

AD8194

HDTV SET

DVD PLAYER

SET-TOP BOX

Figure 2. Typical AD8194 Application for HDTV Sets

GENERAL DESCRIPTION

The AD8194 is a low cost quad 2:1 TMDS® switch for high

speed HDMI™/DVI video applications. The AD8194 features

equalized inputs, ideal for systems with long cable runs. Its

primary function is to switch the high speed signals from one

of two single-link (HDMI or DVI) sources to the single-link

output. The AD8194 is a fully buffered switch solution with 50 Ω

input and output terminations, providing full-swing output

signal recovery and minimizing reflections for improved system

signal integrity.

The AD8194 is provided in a space-saving, 32-lead, LFCSP,

surface-mount, RoHS-compliant, plastic package and is specified

to operate over the −40°C to +85°C temperature range.

PRODUCT HIGHLIGHTS

1.

Data supports rates up to 2.25 Gbps, enabling greater than

1080p deep color (12-bit color) HDMI formats and greater

than UXGA (1600 × 2300) DVI resolutions.

2.

Fully buffered inputs and outputs.

3.

Input cable equalizer enables use of long cables at the

input. For a typical 24 AWG cable, the AD8194 compen-

sates for more than 20 m at data rates up to 2.25 Gbps.

4.

Matched 50 Ω on-chip input and output terminations

improve system signal integrity.

5.

Single-pin source select bit.

6.

Low added jitter.