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參數(shù)資料
| 型號： | Am7969-175LKC |
| 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(shù)： | 17/127頁 |
| 文件大小： | 730K |
| 代理商： | AM7969-175LKC |
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AMD
13
Am7968/Am7969
Oscillator
The Am7968 and Am7969 contain an inverting amplifier
intended to form the basis of a parallel mode oscillator.
The design of this oscillator considered several factors
related to its application.
The first consideration is the desired frequency accu-
racy. This may be subdivided into several areas. An os-
cillator is considered stable if it is insensitive to
variations in temperature and supply voltage, and if it is
unaffected by individual component changes and aging.
The design of the TAXIchip set is such that the degree to
which these goals are met is determined primarily by the
choice of external components. Various types of crystal
are available and the manufacturers’ literature should
be consulted to determine the appropriate type. For
good temperature stability, zero temperature coefficient
capacitors should be used (Type NPO).
The mechanism by which a crystal resonates is electro-
mechanical. This resonance occurs at a fundamental
frequency (1st harmonic) and at all odd harmonics of
this frequency (even harmonic resonance is not me-
chanically possible). Unless otherwise constrained,
crystal oscillators operate at their fundamental
frequencies.
A typical crystal specification for use in this circuit is:
Fundamental Frequency 3.3 MHz–17.5 MHz
±
0.1%
Resonance: Mode
Load Capacitor (Correlation)
Operating Temperature Range
Temperature Stability
Drive Level (Correlation)
Effective Series Resistance
Holder Type
Aging for 10 years
It is good practice to ground the case of the crystal to
eliminate stray pick-up and keep all connections as
short as possible.
Parallel
30 pF
0
°
C to 70
°
C
±
100 ppm
2 mW
25
(max)
Low profile
±
10 ppm
RESET
Am7968 or, Am7969
X1
X2
C
C
Power On RESET (Optional)
C* = 220 pF for 4.0–12.5 MHz crystal, 150 pF for a 12.5–17.5 MHz Crystal.
*C determined by crystal specifications and trace capacities. Values shown are typical.
07370F-10
Figure 1. Connections for 4.0 MHz–17.5 MHz
相關PDF資料 |
PDF描述 |
|---|---|
| AM7968-125VB3A | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7969-125VB3A | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7968-175JC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7969-175JC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7968-125DC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AM7969-175LMC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7969-175PC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver |
| AM7969-175PCB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver |
| AM7969-70/B3A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver |
| AM7969-70/BXA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver |
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