Datasheet LTC4307-1 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | High Definition Multimedia Interface (HDMI) Level-Shifting 2-Wire Bus Buffer |
| Seiten / Seite | 12 / 1 — FEATURES. DESCRIPTIO. Bidirectional Buffer for Display Data Channel … |
| Dateiformat / Größe | PDF / 167 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. Bidirectional Buffer for Display Data Channel (DDC). Compliant with HDMI Specifi cation Version 1.3
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LTC4307-1 High Defi nition Multimedia Interface (HDMI) Level- Shifting 2-Wire Bus Buffer
U FEATURES DESCRIPTIO
■
Bidirectional Buffer for Display Data Channel (DDC)
The LTC4307-1 is a 2-wire bus buffer that provides ca- ■
Compliant with HDMI Specifi cation Version 1.3
pacitance buffering between input and output. The HDMI
DDC Capacitance Requirement
specifi cation requires that devices have less than 50pF of ■
Level Translation Between 3.3V and 5V
input capacitance on their DDC bus lines. The LTC4307-1’s ■
±5kV Human Body Model ESD Protection
capacitance buffering feature, in conjunction with its ■
60mV Buffer Offset Independent of Load
sub-10pF data and clock input capacitance, allows HDMI ■
Compatible with Non-Compliant VOL I2C Devices
components to easily meet the 50pF requirement and ■ Isolates Input SDA and SCL Line from Output tolerate high capacitance on the internal bus. ■ Compatible with I2CTM, I2C Fast Mode and SMBus The LTC4307-1 also provides level-shifting between 3.3V ■ READY Open-Drain Output and 5V systems to allow lower voltage HDMI transmitters, ■ High Impedance SDA, SCL Pins for VCC = 0V receivers and EEPROM to interface to the 5V DDC bus. ■ Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP READY is an open-drain digital output fl ag that indicates Packages whether or not the input and output busses are connected
U
and can interface to the HDMI hot plug detect (HPD) signal.
APPLICATIO S
When driven high, the ENABLE digital input allows the ■ LTC4307-1 to connect after a stop bit or bus idle. Driving HDMI ■ ENABLE low breaks the connection between the input and 3.3V/5V Level Translation ■ output busses. Capacitance Buffer/Bus Extender , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7032051, 6356140, 6650174
U TYPICAL APPLICATIO Rising Edge from Asserted Low
DVD PLAYER (SOURCE) TV (SINK) 1000 3.3V 5V 0.1μF 800 EEPROM 1.8k 1.8k 10k 10k LTC4307-1 600 HDMI TX HDMI V /DIV LOW CC IC CABLE <50pF OFFSET SDAIN SDAOUT HDMI RX SDAOUT 200mV SCLIN SCLOUT IC 400 ENABLE μC SDAIN DDC GROUND GND 200 0 0 100 200 300 400 500 600 43071 TA01a 100ns/DIV 43071 TA01b 43071fa 1
U FEATURES DESCRIPTIO
■
Bidirectional Buffer for Display Data Channel (DDC)
The LTC4307-1 is a 2-wire bus buffer that provides ca- ■
Compliant with HDMI Specifi cation Version 1.3
pacitance buffering between input and output. The HDMI
DDC Capacitance Requirement
specifi cation requires that devices have less than 50pF of ■
Level Translation Between 3.3V and 5V
input capacitance on their DDC bus lines. The LTC4307-1’s ■
±5kV Human Body Model ESD Protection
capacitance buffering feature, in conjunction with its ■
60mV Buffer Offset Independent of Load
sub-10pF data and clock input capacitance, allows HDMI ■
Compatible with Non-Compliant VOL I2C Devices
components to easily meet the 50pF requirement and ■ Isolates Input SDA and SCL Line from Output tolerate high capacitance on the internal bus. ■ Compatible with I2CTM, I2C Fast Mode and SMBus The LTC4307-1 also provides level-shifting between 3.3V ■ READY Open-Drain Output and 5V systems to allow lower voltage HDMI transmitters, ■ High Impedance SDA, SCL Pins for VCC = 0V receivers and EEPROM to interface to the 5V DDC bus. ■ Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP READY is an open-drain digital output fl ag that indicates Packages whether or not the input and output busses are connected
U
and can interface to the HDMI hot plug detect (HPD) signal.
APPLICATIO S
When driven high, the ENABLE digital input allows the ■ LTC4307-1 to connect after a stop bit or bus idle. Driving HDMI ■ ENABLE low breaks the connection between the input and 3.3V/5V Level Translation ■ output busses. Capacitance Buffer/Bus Extender , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7032051, 6356140, 6650174
U TYPICAL APPLICATIO Rising Edge from Asserted Low
DVD PLAYER (SOURCE) TV (SINK) 1000 3.3V 5V 0.1μF 800 EEPROM 1.8k 1.8k 10k 10k LTC4307-1 600 HDMI TX HDMI V /DIV LOW CC IC CABLE <50pF OFFSET SDAIN SDAOUT HDMI RX SDAOUT 200mV SCLIN SCLOUT IC 400 ENABLE μC SDAIN DDC GROUND GND 200 0 0 100 200 300 400 500 600 43071 TA01a 100ns/DIV 43071 TA01b 43071fa 1