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參數(shù)資料
| 型號： | SY89535L |
| 英文描述： | Programmable Output Frequency Synthesizer |
| 中文描述： | 可編程輸出頻率合成器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 314K |
| 代理商： | SY89535L |
4
ClockWorks
SY89529L
Micrel
FUNCTIONAL DESCRIPTION AND TEST MODES
Introduction
The SY89529L supports three operational modes, as shown
in Table 1, page 2. The three modes are spread-spectrum
clocking (SSC), non-spread-spectrum clock, and a test mode
dynamically controlled with the SSC_Control pins. Unlike
other synthesizers, the SY89529L can change spread-
spectrum operation on the fly.
In SSC mode, the output clock is modulated (30KHz,
triangle waveform) in order to achieve a reduction in EMI. In
the PLL-bypass test mode, the PLL is disconnected as the
source to the differential output, thus allowing an external
source to be connected to the TEST INPUT pin. This is useful
for in-circuit testing by enabling the differential output to be
driven at a lower frequency.
Crystal Input and Oscillator Interface
The SY89529L features a fully integrated on-board oscillator
to minimize system implementation costs. The oscillator is a
series resonant, multivibrator type design, and thus, a series-
resonant crystal is preferred, but not required.
A parallel-resonant crystal can be used with the SY89529L
with only a minor error in the desired frequency. A parallel-
resonant mode crystal used in a series resonant circuit will
exhibit a frequency of oscillation a few hundred ppm lower
than specified, a few hundred ppm translates to KHz
inaccuracies. In a general computer application this level of
inaccuracy is immaterial.
As the oscillator is somewhat sensitive to loading on its
inputs, the user is advised to mount the crystal as close to the
SY89529L as possible to avoid any board level parasitics. In
addition, trace lengths should be matched. Figure 1 shows
how to interface with a crystal. Table 2 illustrates the crystal
specifications. If a start-up problem occurs, consider adding a
10pf capacitor across XTAL1 and XTAL2.
SY89529L
XTAL2
(Pin 26, SOIC)
XTAL1
(Pin 25, SOIC)
XTAL
16.666MHz
Quartz Crystal Selection:
(1) Raltron Series Resonant: AS-16.666-S-SMD-T-MI
(2) Raltron Parallel Resonant: AS-16.666-18-SMD-T-MI
Optional
Figure 1. Crystal Interface
Loop Filter Design
The filter for any Phase Locked Loop (PLL) based device
deserves special attention. SY89529L provides filter pins for
an external filter. A simple three-component passive filter is
required for achieving ultra low jitter. Figure 2 shows the
recommended three-components. Due to the differential
design, the filter is connected between LOOP_FILTER and
LOOP_REF pins. With this configuration, extremely high
supply noise rejection is achieved. It is important that the filter
circuit and filter pins be isolated from any non-common mode
coupling plane.
1000pF
Loop
Filter
Loop
Reference
560
0.47
μ
F
Figure 2. External Loop Filter Connection
Table 2. Quartz Crystal Oscillator Specifications
Output Frequency: 16.666MHz
Mode of Oscillation: Fundamental
Min.
Typ.
Max.
Unit
Frequency Tolerance @25
°
C
Frequency Stability over 0
°
C to 70
°
C
—
±
30
±
50
±
50
±
100
ppm
—
ppm
Operating Temperature Range
–
20
—
+70
°
C
°
C
ppm
Storage Temperature Range
–
55
—
+125
Aging (per yr/1st 3yrs)
—
—
±
5
Load Capacitance
—
18 (or series)
—
pF
Equivalent Series Resistance (ESR)
—
—
50
μ
W
Drive Level
—
100
—
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