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TriQuint's TQ2060 is a high-frequency clock generator. It utilizes a 35 MHz to 50 MHz TTL input to generate a 350 MHz to 500 MHz PECL output. The TQ2060 has a completely self-contained Phase-Locked Loop (PLL) running at 700 MHz to 1000 MHz. This stable PLL allows for a low period-to-period output jitter of 70 ps (max), and enables tight duty cycle control of 55% to 45% (worst case).
The TQ2060 provides optional 200 ohm on-chip pull-down resistors which are useful if the output is AC-coupled to the device being driven. In order to use these resistors, pin 20 (PDR2) should be connected to pin 21 (QN), and pin 23 (PDR1) should be connected to pin 22 (Q).
Various test modes on the chip simplify debug and testing of systems by slowing the clock output or by bypassing the PLL.
TQ2060 Maximum Ratings
Storage temperature
65 °C to +150 °C
Ambient temperature with power applied
55 °C to +110 °C
Supply voltage to ground potential
0.5 V to +7.0 V
DC input voltage
0.5 V to +(VDD + 0.5)V
DC input current
30 mA to +5 mA
Package thermal resistance (MQuad)
JA = 45 °C/W
Die junction temperature
TJ = 150 ° C
TQ2060 Features
• Output frequency range: 350 MHz to 500 MHz • One differential PECL output: 600 mV (min) swing • Common-mode voltage: VDD 1.2 V (max) VDD 1.6 V (min) • Period-to-period output jitter: 25 ps peak-to-peak (typ) 70 ps peak-to-peak (max) • Reference clock input: 35 MHz to 50 MHz TTL-level crystal oscillator • Self-contained loop filter • Optional 200-ohm pull-down resistors for AC-coupled outputs • +5 V power supply • 28-pin J-lead surface-mount package • Ideal for designs based on DEC Alpha AXP™ processors