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參數資料
| 型號： | TFP9431CPAP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, POWER, THERMALLY ENHANCED, PLASTIC, TQFP-64 |
| 文件頁數： | 4/18頁 |
| 文件大小： | 241K |
| 代理商： | TFP9431CPAP |
TFP9431
PanelBus
DVI RECEIVER WITH TRIPLE DAC
SLDS122A – MARCH 2000 – REVISED JUNE 2000
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
TFP9431 clocking and data synchronization
The TFP9431 receives a clock reference from the DVI transmitter that has a period equal to the pixel time, Tpix.
The frequency of this clock is also referred to as the pixel rate. Since the TMDS encoded data on Rx[2:0]
contains 10 bits per 8 bit pixel it follows that the Rx[2:0] serial bit rate is 10 times the pixel rate. For example,
the required pixel rate to support an UXGA resolution with 60 Hz refresh rate is 165 MHz. The TMDS serial bit
rate is 10x the pixel rate or 1.65 Gb/s. Due to the transmission of this high-speed digital bit stream, on three
separate channels (or twisted-pair wires) of long distances (3-5 meters), phase synchronization between the
data steams and the input reference clock is not guaranteed. In addition, skew between the three data channels
is common. The TFP9431 uses a 4x oversampling scheme of the input data streams to achieve reliable
synchronization with up to 1-Tpix channel-to-channel skew tolerance. Accumulated jitter on the clock and data
lines due to reflections and external noise sources is also typical of high speed serial data transmission, hence
the TFP9431’s design for high jitter tolerance.
The input clock to the TFP9431 is conditioned by a phase-locked-loop (PLL) to remove high frequency jitter from
the clock. The PLL provides four 10x clock outputs of different phase to locate and sync the TMDS data streams
(4x oversampling). During active display the pixel data is encoded to be transitioned minimized, whereas in
blank, the control data is encoded to be transition maximized. A DVI compliant transmitter is required to transmit
in blank for a minimum period of time, 128-Tpix, to ensure sufficient time for data synchronization when the
receiver sees a transition maximized code. Synchronization during blank, when the data is transition
maximized, ensures reliable data bit boundary detection. Phase synchronization to the data streams is unique
for each of the three input channels and is maintained as long as the link remains active.
TFP9431 TMDS input levels and input impedance matching
The TMDS inputs to the TFP9431 receiver have a fixed single-ended termination to AVCC The TFP9431 is
internally optimized using a laser trim process to precisely fix the impedance at 50
. The device will function
normally with or without a resistor on the EXT_RES pin, so it remains drop-in compatible with current sockets.
The fixed impedance eliminates the need for an external resistor while providing optimum impedance matching
to standard 50-
DVI cables.
Figure 14 shows a conceptual schematic of a DVI transmitter and TFP9431 receiver connection. A transmitter
drives the twisted pair cable via a current source, usually achieved with an open drain type output driver. The
internal resistor, which is matched to the cable impedance, at the TFP9431 input provides a pullup to AVCC.
Naturally, when the transmitter is disconnected and the TFP9431 DVI inputs are left unconnected, the TFP9431
receiver inputs pull-up to AVCC. The single ended differential signal and full differential signal is shown in Figure
15. The TFP9431 is designed to respond to differential signal swings ranging from 150 mV to 1.56 V with
common mode voltages ranging from (AVCC-300 mV) to (AVCC-37 mV).
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