PDF MAX9486 Data sheet ( Hoja de datos )

Número de pieza	MAX9486
Descripción	8kHz Reference Clock Synthesizer with Multiple Outputs at 35.328MHz
Fabricantes	Maxim Integrated
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No Preview Available ! 19-3345; Rev 0; 8/04 EVAALVUAAILTAIOBNLEKIT 8kHz Reference Clock Synthesizer with Multiple Outputs at 35.328MHz General Description The MAX9486 low-cost, high-performance clock syn- thesizer with an 8kHz input reference clock provides six buffered LVTTL clock outputs at 35.328MHz. The clock synthesizer can be used to generate the clocks for T1, E1, T3, E3, and xDSL. The MAX9486 has two phase-lock loops (PLLs). The first PLL uses a voltage-controlled crystal oscillator (VCXO). The second PLL is a frequency multiplier. With the two PLLs, the MAX9486 generates the output fre- quency at 35.328MHz. In addition, this device gener- ates a jitter-suppressed 8kHz output that provides a better source for the reference clock relay. The MAX9486 is available in a 24-pin TSSOP package and operates over the extended operating temperature range of -40°C to +85°C and a single +3V to +3.6V power-supply range. Features ♦ 8kHz Input Reference CLK ♦ High-Jitter Rejection on the Reference CLK ♦ Synthesizer Locks to the 8kHz Reference with a ±200ppm Range ♦ Output Frequency: 35.328MHz ♦ Six Buffered LVTTL Low-Jitter Outputs ♦ One 8kHz Reference CLK Relay Output ♦ +3.3V Supply Operation ♦ 24-Pin TSSOP Package Applications Telecom Equipment Using T1, E1, T3, E3, and ISDN Protocols xDSL Equipment in CO with Interface to the Telecom Protocols PART MAX9486EUG Ordering Information TEMP RANGE -40°C to +85°C PIN-PACKAGE 24 TSSOP Pin Configuration Typical Application Circuit TOP VIEW SHDN 1 REO 2 REIN 3 VDDP 4 GNDP 5 X1 6 VDD 7 X2 8 GND 9 LP2 10 LP1 11 SETI 12 MAX9486 TSSOP 24 CLK1 23 GND 22 CLK2 21 VDD 20 CLK3 19 VDD 18 GND 17 CLK4 16 VDD 15 CLK5 14 GND 13 CLK6 R1 C1 C2 LP1 LP2 X1 X2 VDDP VDD SETI CLK1 CLK2 RSET MAX9486 CLK3 GNDP CLK4 VDD SHDN CLK5 CLK6 REIN GND REO ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 page 8kHz Reference Clock Synthesizer with Multiple Outputs at 35.328MHz PIN 1 2 3 4 5 6 7, 16, 19, 21 8 9, 14, 18, 23 10 11 12 13 15 17 20 22 24 NAME SHDN REO REIN VDDP GNDP X1 VDD X2 GND LP2 LP1 SETI CLK6 CLK5 CLK4 CLK3 CLK2 CLK1 Pin Description FUNCTION Active-Low Shutdown Input Reference Clock Output. REO is an 8kHz reference clock output with jitter suppression. Reference Input Phase-Lock Loop (PLL) Power Supply. Bypass VDDP with 0.1µF and 0.001µF capacitors to GNDP. PLL Ground Crystal Input 1. Connect X1 to a fundamental mode crystal for the VCXO. Digital Power Supply. Bypass VDD with 0.1µF and 0.001µF capacitors to GND. Crystal Input 2. Connect X2 to a fundamental mode crystal for the VCXO. Ground External Filter 2. Connect the loop filter capacitors and a resistor between LP1 and LP2 (see the Typical Application Circuit). LP2 is internally connected to GNDP. External Filter 1. Connect the loop filter capacitors and a resistor between LP1 and LP2 (see the Typical Application Circuit). Charge-Pump Current-Setting Input. Connect a resistor from SETI to GNDP to set PLL charge-pump current (see the Detailed Description section). Clock Output 6 at 35.328MHz Clock Output 5 at 35.328MHz Clock Output 4 at 35.328MHz Clock Output 3 at 35.328MHz Clock Output 2 at 35.328MHz Clock Output 1 at 35.328MHz _______________________________________________________________________________________ 5 5 Page

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