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3EQHM53-BT-32.768Y-D1.0中文资料

DESCRIPTION

EQHM53 series low EMI oscillators can reduce system EMI by 15dB.The oscillators are a ‘drop-in’ replacement for standard oscillators.EMI reduction is achieved by the use of Spread Spectrum Technology whereby the mode energy is spread over a wider bandwidth. The modulation carrier frequency, operating in the kHz region, makes the process transparent to the oscillator frequency. There is a choice of modulation rates and spread to suit application requirements.

Provides up to 15dB reduction in system EMI ‘Drop-in’ replacement for standard clocks Choice of modulation rate and spread

Miniature package: 5.0 mm x 3.2 mm x 1.2mm

Printers, Multiple Function Printers (MPCs) Digital Copiers; PDAs

Networking: LAN/WAN; Routers

Storage Systems (CD-ROM, VCD, DVD, HDD) Scanners; Modems; Projectors Embedded Systems Musical Instruments

Automotive: GPS car navigation systems LCD PC Monitors; LSD TVs ADSL; PCMCIA

Still Digital Cameras (SDCs)

APPLICATIONS SPREAD SPECTRUM TECHNOLOGY

Unlike a conventional clock oscillator, in a Spread Spectrum Clock Oscillator the mode energy is spread over a wider bandwidth. This is achieved by the frequency modulation technique. The controlled modulation process may be applied to the 'down' side of the nominal frequency (known as DOWN SPREAD ,) or spread equally either side of nominal (CENTRE SPREAD ). Down Spread is preferred if over-clocking would cause a problem to the system.

MODULATION TYPES - EXAMPLES

Output amplitude (dB) vs. frequency span (MHz)

Page 1 of 2

In electrical systems the principal cause of electro-magnetic interference (EMI) is the system clock

oscillator. Traditional methods of 'patching-up' systems with too high a level of EMI is to use ferrite beads,filters, ground planes, metal shielding and similar costly methods, However, the most efficient and economic method to reduce EMI is to reduce it at source: replace the system clock ocillator with a low EMI clock https://www.sodocs.net/doc/1d17951171.html,pared with conventional clock oscillators, Spread Spectrum (Dithered) Oscillators can reduce EMI by as much as 15dB. The part is a 'drop-in' replacement for a standard clock oscillator hence there is no requirement to re-design existing PCBs.

OUTLINE & DIMENSIONS

3EQHM53-BT-32.768Y-C0.5

Model No:

3EQHM53 (Group ‘Y’)

Frequency Range: 10.0MHz to 160.0MHz Spread Types: See table below

EMI Reduction*: -9dBc min. 100MHz at C0.5** -12Bc min. 100MHz at C1.0** -15dBc min. 100MHz at C1.5** With reference to dB level at no

modulation.

Modulation Carrier Frequency: 12kHz min, 42kHz max. Frequency dependent Call for details Output Logic: CMOS

Input Voltage:

Vdd = +3.3VDC ±5%Frequency Stability*** Commercial (0~70°C): ±25ppm (Spec. code = ‘A’)

±50ppm (Spec. code = ‘B’) ±100ppm (Spec. code = ‘C’) Industrial (-40~+85°C): ±25ppm (Spec. code = ‘D’) ±50ppm (Spec. code = ‘E’)

±100ppm (Spec. code = ‘F’)Output Voltage HIGH ‘1’: 2.0V min., 3.2V typ. (90%Vdd)Output Voltage LOW ‘0’: 0.8V max., 0.2V typ. (10%Vdd)Rise/fall Times: 4ns max, (frequency dependant)Load:

15pF

Start-up Time:

2ms typical, 5ms max.Storage Temperature: -65° to +150°C

Current Consumption: 10 ~ 50MHz: 10mA typical 50 ~ 125MHz: 18mA typical

Duty Cycle:

50%±5% (CL=15pF, 50%Vdd)Cyle to Cycle Jitter: ±100ps typ. ±150ps max.Output Impedance:

40 Ohms typical

Static Discharge Voltage: >2000V (per MIL STD 833)Ageing: ±5ppm /year max at Ta=25°C Packaging: EIA 16mm tape and reel, 1k per.Pad 1 Option: Output Enable/Disable. Output is high impedance when taken low

Output enable time 100ms max.

Notes:

* EMI reduction is applied to the entire frequency spectrum

** dBc: with respect to no modulation. Frequency and total % spread dependant.

*** Frequency Stability parameter excludes modulation.

SPECIFICATION Page 2 of 2

PART NUMBER CONFIGURATION

‘T’ for Tristate

Frequency Stability Code

‘A’ to ‘F’. See specification above

Frequency (MHz)

Group ‘Y’

AVAILABILITY OF SPREAD TYPES AND MODULATION RATES

Series designation

ENVIRONMENTAL SPECIFICATION RoHS Compliance:

RoHS compliant and Pb (lead) free Storage Temperature Range: -55° to +125°C

Humidity:

85% RH, 85°C for 48 hours

Hermetic Seal: Leak Rate 2x10-8 ATM-cm 3/s max.Solderability: MIL-STD-2002F method 208E Reflow: 260° for 10 seconds

Vibration: MIL-STD-202F method 204,

35g 50Hz to 2000Hz

Shock: MIL-STD-202F method 213B, test

condition: E, 1000g ? sine wave

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