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Número de pieza | DS4212 | |
Descripción | (DS4106 - DS4425) Clock Oscillators | |
Fabricantes | Maxim Integrated Products | |
Logotipo | ||
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Rev 0; 7/07
106.25MHz/212.5MHz/425MHz
Clock Oscillators
General Description
The DS4106, DS4212, and DS4425 ceramic surface-
mount crystal oscillators are part of Maxim’s DS4-XO
series crystal oscillators family. These devices offer out-
put frequencies at 106.25MHz, 212.5MHz, and 425MHz.
The clock oscillators are suited for systems with tight tol-
erances because of the jitter, phase noise, and stability
performance. The small package provides a format
made for applications where PCB space is critical.
These clock oscillators are crystal based and use a fun-
damental crystal with PLL technology to provide the
final output frequencies. Each device is offered with
LVDS or LVPECL output types. The output enable pin is
active-high logic.
These clock oscillators have very low phase jitter and
phase noise. Typical phase jitter is < 0.9psRMS from
12kHz to 20MHz. The devices are designed to operate
with a 3.3V ±5% supply voltage, and are available in a
5.0mm x 3.2mm x 1.49mm, 10-pin LCCC surface-mount
ceramic package.
Applications
Fibre Channel Hard Disk Drives
Host Bus Adapters
Raid Controllers
Fibre Channel Switches
Pin Configuration and Selector Guide appear at end of
data sheet.
Features
♦ Clock Output Frequencies:
DS4106: 106.25MHz
DS4212: 212.50MHz
DS4425: 425.00MHz
♦ Phase Jitter (RMS): 0.9ps Typical
♦ LVPECL or LVDS Output
♦ Supply Current:
50mA (Typical, Unloaded) at +3.3V Supply
(LVPECL)
53mA (Typical) at +3.3V Supply (LVDS)
♦ -40°C to +85°C Temperature Range
♦ Output Disable
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS4106AN+
-40°C to +85°C
10 LCCC
DS4106BN+
-40°C to +85°C
10 LCCC
DS4212AN+
-40°C to +85°C
10 LCCC
DS4212BN+
-40°C to +85°C
10 LCCC
DS4425AN+
-40°C to +85°C
10 LCCC
DS4425BN+
-40°C to +85°C
10 LCCC
+Denotes a lead-free package. The lead finish is JESD97
category e4 (Au over Ni) and is compatible with both lead-based
and lead-free soldering processes.
Typical Operating Circuits
VCC
VCC
OE OUTP
DS4106/
DS4212/
DS4425
OUTN
GND
50Ω
VCC - 2V
50Ω
100Ω
LVPECL OPTION
VCC
LVPECL
VCC
VCC
OE OUTP
VCC
DS4106/
DS4212/
DS4425
OUTN
GND
100Ω
LVDS OPTION
LVDS
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page PIN
1
2, 7–10
3
4
5
6
—
106.25MHz/212.5MHz/425MHz
Clock Oscillators
NAME
OE
N.C.
GND
OUTP
OUTN
VCC
EP
Pin Description
FUNCTION
Output Enable. On-chip pullup resistor. Connect OE to logic-high, VCC, or leave open to enable the
output clock. Connect OE to logic-low or GND to disable the output clock. The LVPECL output
clock is set to high impedance when disabled. The LVDS output clock is latched to a differential
high when disabled.
No Connection
Ground
Positive Clock Output, LVPECL or LVDS
Negative Clock Output, LVPECL or LVDS
+3.3V Supply
Exposed Paddle. The exposed pad must be used for thermal relief. This pad can be connected to
ground.
Detailed Description
The DS4106/DS4212/DS4425 combine a crystal and an
IC to form a precision clock. Figure 1 shows a function-
al diagram of the devices. The IC consists of a crystal
oscillator, a low-noise PLL, selectable clock-divider cir-
cuitry, and an output buffer. The PLL consists of a digi-
tal phase/frequency detector (PFD) and low-jitter
generation VCO. The VCO signal is scaled by a clock-
divider circuit and applied to the output buffer.
Output Drivers
All devices are available with either LVPECL
(DS4106A/DS4212A/DS4425A) or LVDS (DS4106B/
DS4212B/DS4425B) output buffers. When not needed,
the output buffers can be disabled. When disabled, the
LVPECL output buffer goes to a high-impedance state.
However, the LVDS outputs go to a differential logic
one (OUTP latched high and OUTN latched low) when
the outputs are disabled.
Additional Information
For more available frequencies, refer to the DS4125
data sheet at www.maxim-ic.com/DS4125.
OSCILLATOR
AMPLIFIER
PFD
DS4106/
DS4212/
DS4425
Figure 1. Functional Diagram
VCC
LOOP FILTER
VCO
COUNTER N
COUNTER M
OUTPUT
BUFFER
VCC
OUTP
OUTN
OE
GND
_______________________________________________________________________________________ 5
5 Page |
Páginas | Total 7 Páginas | |
PDF Descargar | [ Datasheet DS4212.PDF ] |
Número de pieza | Descripción | Fabricantes |
DS4212 | (DS4106 - DS4425) Clock Oscillators | Maxim Integrated Products |
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