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502PCB-ABAF

器件型号:502PCB-ABAF
器件类别:无源元件   
文件大小:4893.62KB,共7页
厂商名称:Silicon
标准:  
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器件描述

osc prog 8ns 20ppm 3.2x5mm

参数
Datasheets:
Si501 - 503 Datasheet:
Si501 - 504 Data Short:
Product Photos:
Si50x SERIES:
Product Training Modules:
CMEMS Technology and Si501/2/3/4 CMEMS Oscillators:
Clock Tree Timing Solutions:
Featured Product:
Si50x CMEMS® Programmable Oscillators:
Silicon Labs - Solutions For The Internet Of Things:
Standard Package : 1
Category: Crystals and Oscillators
Family: Programmable Oscillators
Series: Si502, CMEMS®
Packaging : Tray
Type: Programmed by Digi-Key (Enter your frequency in Web Order Notes)
Available Frequency Range: 32kHz ~ 100MHz
Function: Tri-State (Output Enable)
Output: LVCMOS
Voltage - Supply: 1.8 ~ 3.3V
Frequency Stability: ±20ppm
Operating Temperature: -20°C ~ 70°C
Spread Spectrum Bandwidth: -
Current - Supply (Max): 8.9mA
Mounting Type: Surface Mount
Package / Case: 4-SMD, No Lead (DFN, LCC)
Height: 0.035" (0.90mm)
Size / Dimension: 0.157" L x 0.126" W (4.00mm x 3.20mm)
Current - Supply (Disable) (Max): 1µA
Dynamic Catalog: Si502, CMEMS® Series

502PCB-ABAF器件文档内容

                                                                                          Si501/2/3

32 KHZ100 MHZ CMEMS OSCILLATOR

Features                             User selectable tRise/tFall options                  Ordering Information:
                                     Glitchless start and stop                                 See Section 5.
Wide frequency range: 32 kHz to     Excellent short-term stability, long-
    100 MHz
    Contact Silicon Labs for            term aging
        frequencies above 100 MHz    Industry standard footprints:

Si501 single frequency w/ OE           2x2.5, 2.5x3.2, 3.2x5 mm
Si502 dual frequency w/ OE/FS       RoHS compliant, Pb-free
Si503 quad frequency w/ FS          Short lead times:  20k:
       FS      TNEW_ FREQ                               TNEW_ FREQ

     CLK                 Hi-Z                                 Hi-Z

                                    Figure 8. Si503 AC Waveform (refer to Table 2)

3. Functional Description

The Si50x series oscillator family includes four base devices. All devices are configurable according to the Section
5. "Ordering Guide". The four devices each support a single clock output frequency at any one time and are
segmented according to the number of clock frequencies they store in on-chip memory.

The Si501 supports a single stored frequency, enabled with the OE functionality. The Si502 stores two frequencies
that can be selected with FS and enabled/disabled with OE functionality. The Si503 stores four frequencies,
selected with FS functionality. The Si503 does not support OE functionality. The Si501/2/3 are covered in this data
sheet.

The Si504 is a programmable oscillator, controlled through a single pin interface (C1D). It is covered in its own
Si504 data sheet available at www.siliconlabs.com/cmems.

All devices in the Si50x CMEMS series employ a cost-optimized, power-efficient, digital FLL architecture to
produce a highly accurate and stable output clock from a passively compensated MEMS resonator reference
frequency.

The architecture uses the MEMS resonator as its reference frequency along with a divided signal from an on-chip,
digitally-controlled VCO to drive a frequency comparator for the FLL's digital loop filter. The digital loop filter
accumulates and further processes the frequency error values to produce the target output frequency.

The architecture also uses a high-resolution, low-noise temperature sensor and temperature compensation
algorithm to offset any temperature drift of the passively compensated MEMS resonator. Each device is calibrated
for temperature and MEMS-resonator frequency pairs and derives a device-specific compensation polynomial. As
the temperature changes, this compensation circuitry offsets any frequency drift.

This tightly coupled system is extremely accurate and fast because the MEMS resonator and CMOS compensation
circuitry are in a single, monolithic chip, and, therefore, separated by a few microns.

The complete system process occurs many thousands of times per second, providing excellent frequency
accuracy and stability across temperature changes, including any fast temperature transients. The oscillator also
supports a low-power version that reduces the sampling cycle to a longer period, reducing power consumption for
applications that can tolerate relaxed jitter specifications of approximately 1 ps RMS to reduce power by
approximately 2-3 mA. See Table 1 for exact specifications.

3.1. OE Enable and Disable States

The Si50x CMEMS series supports four operational output states via the FS/OE configuration pin. If enabled, the
Si50x is in Run mode, the clock is output and power is as specified in Table 1. The disable modes are Stop, Sleep,
and Doze. Each of these states has a different power consumption profile as specified in Table 1.

3.1.1. Stop Mode
The Si50x output in Stop mode is high-impedance, also known as High-Z (Hi-Z) or Tri-State. Stop mode disables
the output driver, but the digital core and MEMS resonator remain enabled for fast transition to Run mode. The
output is stopped and held at High-Z after completing the last cycle glitch-free. No other power saving measure is
taken in Stop mode.

12                             Preliminary Rev. 0.72
                                                                    Si501/2/3

3.1.2. Doze Mode
The Si50x output in Doze mode is high-impedance, also known as High-Z (Hi-Z) or Tri-State. Doze mode disables
the output driver, the VCO, and the MEMS resonator, but the digital core remains enabled. The output is stopped
and is held at High-Z after completing the last cycle glitch-free.

3.1.3. Sleep Mode
The Si50x output in Sleep mode is high-impedance, also known as High-Z (Hi-Z) or Tri-State. Sleep mode disables
power to all circuitry except for low-leakage circuitry that retains the last device configuration. The output is stopped
and is held at High-Z after completing the last cycle glitch-free.

3.2. Output Rise and Fall Settings

The Si50x clock output is programmable. This enables reduction of electromagnetic interference (EMI) radiation
from the clock output. The amount of EMI reduction is dependent on the output frequency, the harmonic of interest,
and the board layout. Lab results using a 50 MHz FOUT and changing the clock tRise/tFall time from 0.7 ns to 8 ns
show up to 14 dB of EMI reduction.

The tRise/tFall feature also allows the Si50x to match competing devices' rise and fall times. Crystal oscillator
tRise/tFall behavior is largely dependent on the supply voltage. In crystal-based oscillators, a higher supply voltage
will generally drive a more rapid tRise/tFall time. The Si50x configuration options allow the user to match the
tRise/tFall to the supply voltage. The Si50x also provides a specified tRise/tFall with a given supply voltage and a

50  trace impedance. See Table 3 for Si50x tRise/tFall specifications.

4. Pin Descriptions

                  FS/OE 1 4 VDD

                        GND 2 3 CLK

                        Figure 9. Si501/2/3

                  Table 11. Pin Description

Pin  Name                                      Function

1    FS/OE FS=Frequency Select. Si502 and Si503 only.

           OE=Output Enable. Si501 and Si502 only.

2    GND Ground.

3    CLK Output clock.

4    VDD Power supply.

           Bypass with a 0.1F capacitor placed as close to the VDD pin as possible.

                        Preliminary Rev. 0.72                                        13
Si501/2/3

5. Ordering Guide

The Si50x family of CMEMS oscillators are highly configurable. Each orderable part number must be specified
according to the guidelines below. Each customized part's performance is guaranteed to operate within the data
sheet specifications. An on-line configuration and ordering tool is available at www.siliconlabs.com/cmems.

5.1. Si501 Ordering Guide and Part Number Syntax

    VDD       Jittervs      TYP               OE OE Internal                      Package
              Power                          High Low PullResistor              Dimension
                           TR/TF                                          B 3.2x5mm4
    A 1.73.6               0.7ns1            A Enable Stop PullUp         C 2.5x3.2mm
                           1.3ns2                                         D 2x2.5mm
    B 3.3V                 1.3ns2            B Enable Doze PullUp
                           1.3ns2                                                    Temp
    C 2.5V    Low           3ns3             C Enable Sleep PullUp                  Range
    D 1.8V                  5ns3                                            F 20to70C
    E 1.73.6 Power          8ns3             D Stop Enable PullDown         G 40to85C
                           0.7ns1
                           1.3ns2            E Doze Enable PullDown                    Reel
                           1.3ns2
    F 1.73.6               1.3ns2            F Sleep Enable PullDown           R Reel
                            3ns3                                                    CutTape
    G 1.73.6                5ns3             G Enable Stop          None
                            8ns3
    H 1.73.6                                 H Enable Doze None

    J 3.3V                                   J Enable Sleep None

    K 2.5V                                   K Stop Enable None
                      Low
                                             L Doze Enable None
    L 1.8V
    M 1.73.6 Jitter                          M Sleep Enable None

    N 1.73.6

    P 1.73.6

                           501 J C A        D A G R

    OPN        Description              Ppm  Frequency                               Revision
    Prefix                                      Code
     501    Singlefrequency        A 50                                           Description
     502    Dual frequency         B 30     Mxxxxxx
     503    Quad frequency         C 20     xMxxxxx                              fOUT
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