Electronic Components Datasheet Search |
|
ICS270PGI Datasheet(PDF) 4 Page - Integrated Circuit Systems |
|
ICS270PGI Datasheet(HTML) 4 Page - Integrated Circuit Systems |
4 / 8 page Triple PLL Field Programmable VCXO Clock MDS 270 B 4 Revision 040705 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com ICS270 PRELIMINARY INFORMATION errorxtal =actual initial accuracy (in ppm) of the crystal being measured If the centering error is less than ±25 ppm, no adjustment is needed. If the centering error is more than 25ppm negative, the PC board has excessive stray capacitance and a new PCB layout should be considered to reduce stray capacitance. (Alternately, the crystal may be re-specified to a higher load capacitance. Contact ICS for details.) If the centering error is more than 25 ppm positive, add identical fixed centering capacitors from each crystal pin to ground. The value for each of these caps (in pF) is given by: External Capacitor = 2 x (centering error)/(trim sensitivity) Trim sensitivity is a parameter which can be supplied by your crystal vendor. If you do not know the value, assume it is 30 ppm/pF. After any changes, repeat the measurement to verify that the remaining error is acceptably low (typically less than ±25 ppm). ICS270 Configuration Capabilities The architecture of the ICS270 allows the user to easily configure the device to a wide range of output frequencies, for a given input reference frequency. The frequency multiplier PLL provides a high degree of precision. The M/N values (the multiplier/divide values available to generate the target VCO frequency) can be set within the range of M = 1 to 1024 and N = 1 to 32,895. The ICS270 also provides separate output divide values, from 2 through 63, to allow the two output clock banks to support widely differing frequency values from the same PLL. Each output frequency can be represented as: Output Drive Control The ICS270 has two output drive settings. Low drive should be selected when outputs are less than 100 MHz. High drive should be selected when outputs are greater than 100 MHz. (Consult the AC Electrical Characteristics for output rise and fall times for each drive option.) ICS VersaClock Software ICS applies years of PLL optimization experience into a user friendly software that accepts the user’s target reference clock and output frequencies and generates the lowest jitter, lowest power configuration, with only a press of a button. The user does not need to have prior PLL experience or determine the optimal VCO frequency to support multiple output frequencies. VersaClock software quickly evaluates accessible VCO frequencies with available output divide values and provides an easy to understand, bar code rating for the target output frequencies. The user may evaluate output accuracy, performance trade-off scenarios in seconds. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS270. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. OutputFreq REFFreq M N ----- ⋅ = Parameter Condition Min. Typ. Max. Units Supply Voltage, VDD Referenced to GND 7 V Inputs Referenced to GND -0.5 VDD+0.5 V Clock Outputs Referenced to GND -0.5 VDD+0.5 V |
Similar Part No. - ICS270PGI |
|
Similar Description - ICS270PGI |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |