SY89532LHC Micrel Inc, SY89532LHC Datasheet - Page 9

• Manufacturer Part Number: SY89532LHC
• Description: IC SYNTHESIZR LVPECL/LVDS 64TQFP
• Manufacturer: Micrel Inc
• Series: Precision Edge®r
• Type: Clock/Frequency Synthesizerr

Specifications of SY89532LHC

• Pll: Yes
• Input: Crystal
• Output: LVPECL
• Number Of Circuits: 1
• Ratio - Input:output: 1:13
• Differential - Input:output: No/Yes
• Frequency - Max: 500MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Frequency-max: 500MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Micrel, Inc.
Crystal Input and Oscillator Interface
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.
33L 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.
inputs, the user is advised to mount the crystal as close to the
SY89532/33L as possible to avoid any board level parasitics.
In addition, trace lengths should be matched. Figure 2 shows
how to interface with a crystal. Table 1 illustrates the crystal
specifications. Certain crystals may require a 10pf capacitor
across XTAL1 and XTAL2 for proper operation. This is normally
not required, but it is recommended that provisions be made
for it.
M9999-010808
[e-mail] or [phone]
OUTPUT FREQUENCY: 14MHz-18MHz
MODE OF OSCILLATION: FUNDAMENTAL
Frequency Tolerance @25 C
Frequency Stability over 0 C to 70 C
Operating Temperature Range
Storage Temperature Range
Aging (per yr/1st 3yrs)
Load Capacitance
Equivalent Series Resistance (ESR)
Drive Level
The SY89532/33L features a fully integrated on-board
A parallel-resonant crystal can be used with the SY89532/
As the oscillator is somewhat sensitive to loading on its
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
XTAL
Optional
Figure 2. Crystal Interface
XTAL2
(Pin 26, SOIC)
XTAL1
(Pin 25, SOIC)
SY89532/33L
Table 1. Quartz Crystal Oscillator Specifications
9
External Loop Filter Considerations
allows the user to tailor the PLL’s behavior to their application
and operating environment. We recommend using ceramic
capacitors with NPO or X7R dielectric, as they have very low
effective series resistance. For applications that require ultra-
low cycle-to-cycle jitter, use the components shown in Figure
3. The PLL loop bandwidth is a function of feedback divider
ratio, and the external loop filter allows the user to compensate.
For instance, the PLL’s loop bandwidth can be decreased by
using a smaller resistor in the loop filter. This results in less
noise from the PLL input, but potentially more noise from the
VCO. Refer to “AC Electrical Characteristics” for target PLL
loop bandwidth. The designer should take care to keep the
loop filter components on the same side of the board and as
close as possible to the SY89532/33L’s LOOP_REF and
LOOP_FILTER pins. To insure minimal noise pick up on the
loop filter, it is desirable to cut away the ground plane directly
underneath the loop filter component pads and traces.
However, the benefit may not be significant in all applications
and one must be careful to not alter the characteristic
impedance of nearby traces.
Min.
–20
–55
—
—
—
—
—
—
The SY89532/33L features an external PLL loop filter that
Figure 3. External Loop Filter Connection
18 (or series)
Typ.
100
—
—
—
—
30
50
Max.
+125
+70
100
50
—
—
50
5
Precision Edge
SY89532/33L
PPM
ppm
ppm
Unit
pF
C
C
W
®