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PDF AD8194 Data sheet ( Hoja de datos )
| Número de pieza | AD8194 | |
| Descripción | Buffered 2:1 TMDS Switch | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8194 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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
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.
Buffered 2:1 TMDS Switch
with Equalization
AD8194
FUNCTIONAL BLOCK DIAGRAM
AVCC AVEE
S_SEL
VTTI
CONTROL
LOGIC
AD8194
IP_A[3:0]
IN_A[3:0]
+
–
IP_B[3:0]
IN_B[3:0]
+
–
VTTI
4
4
4
EQ
SWITCH
CORE
Tx
4
4
4
HIGH SPEED
BUFFERED
VTTO
+ OP[3:0]
– ON[3:0]
Figure 1.
TYPICAL APPLICATION
HDTV SET
HDMI
RECEIVER
SET-TOP BOX
AD8194
DVD PLAYER
Figure 2. Typical AD8194 Application for HDTV Sets
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
1 page  
AD8194
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
AVCC to AVEE
VTTI
VTTO
Internal Power Dissipation
High Speed Input Voltage
High Speed Differential
Input Voltage
Source Select (S_SEL)
Storage Temperature Range
Operating Temperature
Range
Junction Temperature
Rating
3.7 V
AVCC + 0.6 V
AVCC + 0.6 V
1.2 W
AVCC − 1.4 V < VIN < AVCC + 0.6 V
2.0 V
AVEE − 0.3 V < VIN < AVCC + 0.6 V
−65°C to +125°C
−40°C to +85°C
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions: a device soldered
in a 4-layer JEDEC circuit board for surface-mount packages.
θJC is specified for the exposed pad soldered to the circuit board
with no airflow.
Table 3. Thermal Resistance
Package Type
θJA
32-Lead LFCSP
47
θJC Unit
6.8 °C/W
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the
AD8194 is limited by the associated rise in junction tempera-
ture. The maximum safe junction temperature for plastic
encapsulated devices is determined by the glass transition
temperature of the plastic, approximately 150°C. Temporarily
exceeding this limit may cause a shift in parametric performance
due to a change in the stresses exerted on the die by the package.
Exceeding a junction temperature of 175°C for an extended
period can result in device failure. To ensure proper operation,
it is necessary to observe the maximum power derating as
determined by the coefficients in Table 3.
ESD CAUTION
Rev. 0 | Page 4 of 16
5 Page 
AD8194
SWITCHING MODE
The source selector pin, S_SEL, is used to select which of the
two input groups is routed to the output. Source A is selected
when S_SEL is pulled up to logic high, and Source B is selected
when S_SEL is pulled down to logic low. Logic levels for this pin
are set in accordance with the specifications listed in Table 5. The
AD8194 can be used as a single-link TMDS buffer by setting
S_SEL to one fixed logic value.
S_SEL also controls the switch status of the input termination
resistors. The termination resistors for the selected input are
always connected, whereas the termination resistors for the
unselected input are always switched out (high-Z inputs).
Table 5. S_SEL Description
Selected
S_SEL Input
Input Termination Status
0 Input B
Input B terminations enabled, Input A
terminations disabled
1 Input A Input A terminations enabled, Input B
terminations disabled
Rev. 0 | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8194.PDF ] | |
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