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參數資料
| 型號： | AM7968 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| 中文描述： | TAXIchip集成電路（透明異步Xmitter，接收器接口） |
| 文件頁數： | 103/127頁 |
| 文件大小： | 730K |
| 代理商： | AM7968 |
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AMD
99
TAXIchip Integrated Circuits Technical Manual
TAXI T
echnical
I
nformation
P
ublication
#89-05
S ubjec t: T AX Ic hip S et Crystal S pec ific ation
Question:
What are the design considerations for crystals used with TAXIchip set
Answer:
The TAXIchip’s parallel mode oscillator uses a 4.0 MHz – 17.5 MHz crystal with a
frequency tolerance of 0.1%.
Any crystal will oscillate in either series or parallel mode depending upon the type of
oscillator used. By specifying parallel mode and the load, the manufacturer will calibrate
the crystal in parallel mode at the desired frequency. This could be important in
applications where frequency tolerance is critical due to the fact that the resonant
frequency in parallel mode is typically 0.02% above the series mode frequency.
As discussed in section 3.3, the time required to synchronize the data recovery circuit in
the Receiver is proportional to the delta between the Transmitter frequency and the
Receiver PLL resting frequency. The Receiver resting frequency is typically less than
±
1% away from its own crystal frequency, due to mismatch between internal circuits.
The crystal specification of 0.1% is meant to be small enough to cause a negligible
effect on lock time while not increasing the crystal cost (0.025% crystals are quite
common). Sometimes tighter frequency and tolerance specifications may be necessary
to meet the user’s system requirements (i.e. FIFO depth, etc.).
More information on crystal specifications for the TAXIchip set may be found in
Section 4.1.1.
A partial list of vendors follows:
Typical 12.5 MHz
Part Number
Distributor
Phone Number
I.E.A.
Calmax Corp.
Monitor Products
Anderson Electronics
Target Electronics
HC18U 12.500
UM-12.5
MM 49XlE12A-12.5
011-668-03260
CC025A-12.5
(408) 435-1000
(714) 957-1299
(619) 433-4510
(814) 695-4428
(408) 733-0384
相關PDF資料 |
PDF描述 |
|---|---|
| AM7968-125VBXA | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7969-125VBXA | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7968-125LKC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7969-125LKC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7968-175LKC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AM7968/AM7969 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Am7968/Am7969 - TAXIchip Integrated Circuits: Transparent Asynchronous Transmitter/Receiver Interface |
| AM7968-100/B3A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
| AM7968-100/BXA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
| AM7968-100DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
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