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參數(shù)資料
| 型號(hào)： | 78Q8392L-CP |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Low Power Ethernet Coaxial Transceiver |
| 中文描述： | 低功率以太網(wǎng)同軸收發(fā)器 |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大?。?/td> | 54K |
| 代理商： | 78Q8392L-CP |
78Q8392L
Low Power Ethernet
Coaxial Transceiver
3
JABBER FUNCTION
When valid data on the TX± pins detected, the jabber
timer is started. If there is valid data for more than 20
ns, a latch is set which disables the transmitter
output and enables the 10 MHz output on the CD±
pins. The latch is reset within 0.5 seconds after the
valid data is removed from the transmitter input
(TX±). This action resets the jabber timer and
disables the 10 MHz CD output. The TX± inputs
must remain inactive during the 0.5 second reset
period.
HEARTBEAT FUNCTION
The 10 MHz CD outputs are enabled for about 1 μs
at approximately 1.1 μs after the end of each
transmission. The heartbeat signal tells the DTE that
the circuit is functioning. This is implemented by
starting the heartbeat timer when the valid data
signal indicates the end of a transmission. This
function is disabled when HBE pin is tied to V
EE.
FIGURE 1: 78Q8392L General System Block Diagram
DATA MEDIA
RECEIVER
INPUT
BUFFER
RXI
CDS
EQUALIZER
SQUELCH
COMPARATOR
LP FILTER
SQUELSH
THRESHOLD
RX+
RX-
TXO
TRANSMIT
OUTPUT DRIVER
PULSE
SHAPING
FILTER
TX+
TX-
TRANSMIT INPUT
BUFFER
BANDGAP
REFERENCE
AND CURRENT
REFERENCE
10 MHz
OSC
RR+
RR-
CD+
CD-
SLICER
TRANSITION
PERIOD
TAMER
NARROW
PULSE
FILTER
RX DATA
VALID
ENABLE
SLICER
TX ON
CONTROL LOGIC
JABBER TIMER
BLANKING TIMER
HEART BEAT TIMER
TX DATA VALID
END TRANSMIT
TX± DISABLE
ENABLE
TX ± < -250 mV
TX ± > -250 mV
COMPARATOR
TX DISABLE
CD ± ON
COLLISION
THRESHOLD
COLLISION
COMPARATOR
BUFFERED TX
TRANSITION
PERIOD
TIMER
TRANSITION
END
TIMER
NARROW
PULSE
FILTER
SIGNAL
PRESET
DETECT
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