TRU050THCHA-24.576MHZ datasheet, PDF

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TRU050THCHA-24.576MHZ: DescriptionPLL/Frequency Synthesis Circuit,; CategoryAnalog mixed-signal IC The signal circuit; File Size173KB，14 Pages; ManufacturerVectron International, Inc.; Websitehttp://www.vectron.com/; Environmental Compliance

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TRU050THCHA-24.576MHZ Overview

PLL/Frequency Synthesis Circuit,

TRU050THCHA-24.576MHZ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
package instruction	DIP,
Reach Compliance Code	compliant
Analog Integrated Circuits - Other Types	PHASE LOCKED LOOP
JESD-30 code	R-CDIP-T16
JESD-609 code	e4
length	20.32 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	CERAMIC, METAL-SEALED COFIRED
encapsulated code	DIP
Package shape	RECTANGULAR
Package form	IN-LINE
Peak Reflow Temperature (Celsius)	260
Maximum seat height	4.69 mm
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	4.5 V
Nominal supply voltage (Vsup)	5 V
surface mount	NO
Temperature level	COMMERCIAL
Terminal surface	Gold (Au) - with Nickel (Ni) barrier
Terminal form	THROUGH-HOLE
Terminal pitch	2.54 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
width	7.62 mm
Base Number Matches	1

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TRU050

Complete VCXO based Phase-Locked Loop

Features

•

Output Frequencies to 65.536 MHz

•

5.0 V or 3.3Vdc Operation

•

Tri-State Output

•

Holdover on Loss of Signal Alarm

•

VCXO with CMOS Outputs

•

0/70° or –40/85°C Temperature Range

•

Ceramic SMD Package

•

RoHS/Lead Free Compliant

The TRU050, VCXO based PLL

Description

The VI TRU050 is a user-configurable crystal-

based PLL integrated circuit. It includes a digital

phase detector, op-amp, VCXO and additional

integrated functions for use in digital

synchronization applications. Loop filter software

is available as well SPICE models for circuit

simulation.

Applications

•

Frequency Translation

•

Clock Smoothing

•

NRZ Clock Recovery

•

DSLAM, ADM, ATM, Aggregation, Optical

Switching/Routing, Base Station

•

Low Jitter PLL’s

Figure 1. TRU050 Block Diagram

Vectron International, 267 Lowell Rd, Hudson NH 03051-4916

Page 1 of 14

Tel: 1-88-VECTRON-1

•

Web:

www.vectron.com

Rev : 06Jan2006

TRU050, VCXO Based PLL

TRU050 Theory of Operation

Phase Detector

The phase detector has two buffered inputs, DATAIN and CLKIN, which are designed to switch at 1.4

volts. DATAIN is designed to accept an NRZ data stream but may also be used for clock signals which

have about a 50% duty cycle. CLKIN is connected to OUT1 or OUT2, or a divided version of one of these

outputs. CLKIN and DATAIN and are protected by ESD diodes and should not exceed the power supply

voltage or ground by more than a few hundred millivolts.

The phase detector is basically a latched flip flop/exclusive-or gate/differential amplifier filter design to

produce a DC signal proportional to the phase between the CLKIN and DATAIN signals, see figure 4 for a

block diagram and figure 5 for a open loop transfer curve. This simplies the PLL design as the designer

does not have to filter narrow pulse signal to a DC level. Under locked conditions the rising edge CLKIN

will be centered in the middle of the DATAIN signal, see figure 6.

The phase detector gain is 0.53V/rad x data density for 5volt operation, and 0.35V/rad x data density for

3.3 volt operation. Data density = 1.0 for clock signals and is system dependent on coding and design

for NRZ signals, but 0.25 could be used as a starting point for data density.

The phase detector output is a DC signal for DATAIN frequencies greater than 1MHz but produces

signficant ripple when inputs are less than 200kHz. Additional filtering is required for low input frequency

applications such as 8kHz frequency translation, see figures 8 and 9.

Under closed loop conditions the active filter has a blocking capacitor which provides a very high DC

gain, so under normal locked conditions and input frequencies >1MHz, PHO will be about V

/2 and will

not vary signifigantly with changes in input frequency (within lock range). The control (voltage pin 1) will

vary according to the input frequency offset, but PHO will remain relatively constant.

Data In

(pin 7)

Clock In

(pin 9)

30 kΩ

20 kΩ

PHO

(pin 6)

Gain = 5 V / 2π

Gain = 2 / 3

Figure 4. Simplified Phase Detector Block Diagram

Vectron International, 267 Lowell Rd, Hudson NH 03051-4916

Page 4 of 14

Tel: 1-88-VECTRON-1

•

Web:

www.vectron.com

Rev : 06Jan2006

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