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參數(shù)資料
| 型號： | CDB8952 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CrystalLAN 100BASE-X and 10BASE-T Transceiver |
| 中文描述： | CrystalLAN個100Base - X和10Base - T的收發(fā)器 |
| 文件頁數(shù)： | 65/82頁 |
| 文件大?。?/td> | 1130K |
| 代理商： | CDB8952 |
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CS8952
CrystalLAN
100BASE-X and 10BASE-T Transceiver
65
plied through the XTAL_I pin, or using an external
clock source supplied through the TX_CLK pin.
When a 25 MHz crystal is used, it should be placed
within one inch of the XTAL_I and XTAL_O pins
of the CS8952. The crystal traces should be short,
have no vias, and run on the component side.
Table
7
lists examples of manufacturers of suitable
crystals. The designer should evaluate their crystal
selection for suitability in their specific design.
An external CMOS clock source may be connected
to the XTAL_I pin, with the XTAL_O pin left
open. The input capacitance of the XTAL_I pin is
larger than the other inputs (a maximum of 35pF),
since it includes the additional load capacitance of
the crystal oscillator. Care should be taken to as-
sure any external clock source attached to XTAL_I
is capable of driving higher capacitive loads. The
clock signal should be 25 MHz ±0.01% with a duty
cycle between 45% and 55%.
When the XTAL_I pin load is a problem, or only a
TTL level clock source is available, the CS8952
can be clocked through the TX_CLK pin, provid-
ing the TX_CLK mode is set appropriately using
the TCM pin. The clock frequency will be depen-
dent on the operating mode.
7.5
The CS8952 requires an isolation transformer with
a 1:1 turns ratio for both the transmit and receive
signals. Table
7
lists examples of manufacturers
Recommended Magnetics
with transformers meeting these requirements.
However, the designer should evaluate the magnet-
ics for suitability in their specific design.
7.6
The CS8952 supports connection to either a 3.3 V
or 5.0 V MII. When connected to a +5.0 V MII, all
power pins should be provided +5.0 V +/- 5%, and
all signal inputs should be referenced to +5.0V.
When interfaced with a 3.3 V MII, VDD_MII pow-
er pins should be provided +3.3 V +/- 5%, VDD
power pins should be provided +5.0 V +/- 5%, and
all signal inputs should be referenced to +3.3 V.
Power Supply and Decoupling
Each CS8952 power pin should be connected to a
0.1 μF bypass capacitor and then to the power
plane. The bypass capacitors should be located as
close to its corresponding power pin as possible.
Connect ground pins directly to the ground plane.
4.99 k
VSS
RES
VSS
CS8952
Via to
Ground Plane
87
86
85
Figure 8. Biasing Resistor Connection and Layout
Component
Manufacturer
Raltron Electronics Corp.
10651 NW 19th St.
Miami, FL 33172
(305) 593-6033
www.raltron.com
Halo Electronics, Inc.
P.O. Box 5826
Redwood City, CA 94063
USA
(650) 568-5800
www.haloelectronics.com
Bel Fuse, Inc.
198 Van Vorst Street
Jersey City, NJ 07302
USA
(201) 432-0463
www.belfuse.com
Pulse Engineering
12220 World Trade Drive
San Diego, CA 92128
USA
(619) 674-8100
www.pulseeng.com
Hewlett Packard
Component Sales
Response Center
(408) 654-8675
www.hp.com/HP-COMP
Table 7. Support Component Manufactures
Part Number
AS-25.000-15-F-
EXT-SMD-TR-
CIR
Crystal
Transformer
TG22-3506ND
S5558-5999-46
PE-68515
Fiber
Interface
HFBR-5103
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相關代理商/技術參數(shù) |
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| CDB8952T | 功能描述:以太網(wǎng)開發(fā)工具 Eval Bd 100BASE-TX/ 10BASE-T Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| CDB-9PF | 制造商:HRS 制造商全稱:HRS 功能描述:CD CRIMP TYPE CONNECTOR |
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| CDBA1100 | 制造商:COMCHIP 制造商全稱:Comchip Technology 功能描述:SMD Schottky Barrier Rectifier |
| CDBA1100-G | 功能描述:肖特基二極管與整流器 SCHOTTKY DIODE 1A, 100V RoHS:否 制造商:Skyworks Solutions, Inc. 產(chǎn)品:Schottky Diodes 峰值反向電壓:2 V 正向連續(xù)電流:50 mA 最大浪涌電流: 配置:Crossover Quad 恢復時間: 正向電壓下降:370 mV 最大反向漏泄電流: 最大功率耗散:75 mW 工作溫度范圍:- 65 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
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