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參數資料
| 型號： | TMDS442PNPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | GREEN, PLASTIC, TQFP-128 |
| 文件頁數： | 25/45頁 |
| 文件大小： | 1977K |
| 代理商： | TMDS442PNPG4 |
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TMDS Outputs
TMDS442
VCC
GND
TMDS
Driver
AVCC
ZO = RT
RT
TMDS
Receiver
HPD Pins
DDC Channels
Dual-Link 2-to-1 Switch Configurations
SLLS757A – AUGUST 2006 – REVISED MARCH 2007
A 1% precision resister, 4.64-k
, connected from VSADJ to ground is recommended to allow the differential
output swing to provide TMDS signal levels. The differential output driver provides a typical 10-mA current sink
capability, which provides a typical 500-mV voltage drop across a 50-
termination resistor. A 10% accuracy
resistor is allowed to be connected when the output swing is not strictly required to meet the TMDS signal levels.
A 10% resistor provides differential output voltages in the range of 438 mV and 532 mV.
Figure 31. TMDS Driver and Termination Circuit
Referring to Figure 31, if both VCC (TMDS442 supply) and AVCC (sink termination supply) are both powered, the
TMDS output signals are high impedance when OE = high. Both supplies being active is the normal operating
condition.
Again refer to Figure 31, if VCC is on and AVCC is off, the TMDS outputs source a typical 5-mA current through
each termination resistor to ground. A total of 10-mW of power is consumed by the terminations independent of
the OE logical selection. When AVCC is powered on, normal operation (OE controls output impedance) is
resumed.
When the power source of the device is off and the power source to termination is on, the IO(off), output leakage
current, specification ensures the leakage current is limited 10-
μA or less.
The PRE pin provides 3dB de-emphasis, allowing output signal pre-conditioning to offset interconnect losses
from the TMDS442 outputs to a TMDS receiver. PRE is recommended to be set low while connecting to a
receiver throw short PCB route.
The HPD signals (HPD1, HPD2, HPD3) have an output impedance of 47-
typically. In certain applications, a
931-
resistor from the HPD output to the connector pin is recommended, to increase the output resistance to
1-K
+/- 20%.
The DDC channels are designed using I2C drivers with 5-V signal tolerance, allowing direct connection to
standard I2C buses.
TMDS442 can be simply configured to operate as a dual-link DVI/HDMI, 2-to-1 switch, by configuring the device
as follows, see Figure 32:
1. Set SA1 = low and SA2 = high
2. Set SB1 = SB2
3. When the 5V_SINK1, HPD_SINK1, SCL_SINK1, and SDA_SINK1 are selected as the control channels
from/to the SINK, connect the 5V_PWR1, HPD1, SCL1, and SDA1 to the dual-link source 1, and connect the
5V_PWR3, HPD3, SCL3, and SDA3 to the dual-link source 2.
4. When the 5V_SINK2, HPD_SINK2, SCL_SINK2, and SDA_SINK2 are selected as the control channels
from/to the SINK, connect the 5V_PWR2, HPD2, SCL2, and SDA2 to the dual-link source 1, and connect the
5V_PWR4, HPD4, SCL4, and SDA4 to the dual-link source 2.
Copyright 2006–2007, Texas Instruments Incorporated
31
Product Folder Link(s): TMDS442
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| TMDS461PZIT | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TMDS442PNPR | 功能描述:視頻開關 IC 4-to-2 DVI/HDMI Sw Pwr I/O Exp RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| TMDS442PNPRG4 | 功能描述:視頻開關 IC 4-to-2 DVI/HDMI Sw Pwr I/O Exp RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| TMDS461 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1080p a?? Deep Color 4-to-1 HDMI/DVI Switch with Adaptive Equalization |
| TMDS461PZT | 功能描述:視頻開關 IC 4 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| TMDS461PZTR | 功能描述:視頻開關 IC 4 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
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