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TQ2059 Datasheet

  • TQ2059

  • High-Frequency Clock Generator

  • 199.68KB

  • 6頁(yè)

  • TRIQUINT

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T
R
I
Q
U
I
N
T
S E M I C O N D U C T O R, I N C .
TQ2059
Figure 1. Pinout Diagram
TESTIN
REFCLK
11
10
9
8
7
6
5
4
NC
High-Frequency
Clock Generator
Features
鈥?Output frequency range:
200 MHz to 350 MHz
鈥?One differential PECL output:
600 mV (min) swing
鈥?Common-mode voltage:
V
DD
鈥?.2 V (max),
V
DD
鈥?.6 V (min)
鈥?Period-to-period output jitter:
30 ps peak-to-peak (typ)
120 ps peak-to-peak (max)
SYSTEM TIMING
PRODUCTS
GND
GND
NC
VDD
NC
TEST1
TEST2
NC
NC
GND
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Control
MUX
Phase
Detector
VCO
NC
梅
10
梅
2
NC
MUX
3
2
NC
NC
1
NC
28
NC
27
NC
26
AVDD
AGND
EVDD
PDR2
QN
PDR1
GND
Q
鈥?Reference clock input:
20 MHz to 35 MHz TTL-level
crystal oscillator
鈥?Self-contained loop filter
鈥?Optional 200-ohm pull-down
resistors for AC-coupled outputs
鈥?+5 V power supply
鈥?28-pin J-lead surface-mount
package
鈥?Ideal for designs based on DEC
Alpha AXP
鈩?/div>
processors
TriQuint鈥檚 TQ2059 is a high-frequency clock generator. It utilizes a 20 MHz
to 35 MHz TTL input to generate a 200 MHz to 350 MHz PECL output. The
TQ2059 has a completely self-contained Phase-Locked Loop (PLL) running
at 400 MHz to 700 MHz. This stable PLL allows for a low period-to-period
output jitter of 120 ps (max), and enables tight duty-cycle control of 55%to
45% (worst case).
The TQ2059 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.
For additional information and latest specifications, see our website:
www.triquint.com
1

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