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參數(shù)資料
| 型號： | DS2154 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Enhanced E1 Single Chip Transceiver(改進(jìn)型E1單片收發(fā)器) |
| 中文描述： | 增強(qiáng)型E1單芯片收發(fā)器 |
| 文件頁數(shù)： | 50/71頁 |
| 文件大?。?/td> | 654K |
| 代理商： | DS2154 |
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DS2154
071498 50/71
12.3 JITTER ATTENUATOR
The DS2154 contains an onboard jitter attenuator that
can be set to a depth of either 32 or 128 bits via the
JABDS bit in the Line Interface Control Register (LICR).
The 128–bit mode is used in applications where large
excursions of wander are expected. The 32–bit mode is
used in delay sensitive applications. The characteris-
tics of the attenuation are shown in Figure 12–4. The jit-
ter attenuator can be placed in either the receive path or
the transmit path by appropriately setting or clearing the
JAS bit in the LICR. Also, the jitter attenuator can be dis-
abled (in effect, removed) by setting the DJA bit in the
LICR. In order for the jitter attenuator to operate prop-
erly, a 2.048 MHz clock (
±
50 ppm) must be applied at the
MCLK pin or a crystal with similar characteristics must
be applied across the MCLK and XTALD pins. If a crys-
tal is applied across the MCLK and XTALD pins, then
capacitors should be placed from each leg of the crystal
to ground as shown in Figure 12–1. Onboard circuitry
adjusts either the recovered clock from the clock/data
recovery block or the clock applied at the TCLKI pin to
create a smooth jitter free clock which is used to clock
data out of the jitter attenuator FIFO. It is acceptable to
provide a gapped/bursty clock at the TCLKI pin if the jit-
ter attenuator is placed on the transmit side. If the
incoming jitter exceeds either 120 UIpp (buffer depth is
128 bits) or 28 UIpp (buffer depth is 32 bits), then the
DS2154 will divide the internal nominal 32.768 MHz
clock by either 15 or 17 instead of the normal 16 to keep
the buffer from overflowing. When the device divides by
either 15 or 17, it also sets the Jitter Attenuator Limit Trip
(JALT) bit in the Receive Information Register (RIR.5).
DS2154 EXTERNAL ANALOG CONNECTIONS
Figure 12–1
1:1
1.15:1 or 1.36:1
(larger winding toward
the network)
2 . 04 8 MHz
0.47 uF
(non–
polarized)
0. 1uF
0. 1uF
0. 1uF
+ 5 V
Rr
Rr
0.1 uF
Rt
Rt
0. 01uF
2.048 MHz
–or–
C1/C2
61
60
18
19
31
30
DS2154
E1 TRANSMIT
LINE
E1 RECEIVE
LINE
TTIP
TRING
RTIP
RRING
DVDD
DVSS
RVDD
RVSS
TVDD
TVSS
XTALD
MCLK
XTALD
NOTES:
1. All resistor values are
±
1%.
2. The Rt resistors are used to increase the transmitter return loss or to protect the device from over–voltage.
3. The Rr resistors are used to terminate the receive E1 line.
4. For 75 ohm termination, Rr=37.5 ohms/for 120 ohm termination Rr=60 ohm.
5. See the separate Application Note for details on how to construct a protected interface.
6. Either a crystal can be applied across the MCLK and XTALD pins or a TTL level clock can be applied to just MCLK.
7. C1 and C2 should be 5 pF lower than two times the nominal loading capacitance of the crystal to adjust for the
input capacitance of the DS2154.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2154DK | 功能描述:KIT DESIGN E1 DS2154 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| DS2154L | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2154L+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2154LA2 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2154LA2+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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