DATA SHEET

84021 Rev E 9/23/15

1

©2015 Integrated Device Technology, Inc

260MHz, Crystal-to-LVCMOS/LVTTL

Frequency Synthesizer

84021

General Description

The 84021 is a general purpose, Crystal-to-LVCMOS/LVTTL High

Frequency Synthesizer. The 84021 has a selectable TEST_CLK or

crystal input. The VCO operates at a frequency range of 620MHz to

780MHz. The VCO frequency is programmed in steps equal to the

value of the input reference or crystal frequency. The VCO and

output frequency can be programmed using the serial or parallel

interface to the configuration logic.

Features

• Two LVCMOS/LVTTL outputs

• Selectable crystal oscillator interface or LVCMOS/LVTTL

TEST_CLK

• Output frequency range: 103.3MHz to 260MHz

• Crystal input frequency range: 14MHz to 40MHz

• VCO range: 620MHz to 780MHz

• Parallel or serial interface for programming counter and output

dividers

• RMS period jitter: 14.7ps (typical), (N ÷ 4, V

DDO = 3.3V±5%)

• RMS phase jitter at 155.52MHz, using a 38.88MHz crystal (12kHz

to 20MHz): 2.61ps (typical)

Offset

Noise Power

100Hz.................-87.9 dBc/Hz

1kHz ...................-115.8 dBc/Hz

10kHz .................-124.2 dBc/Hz

100kHz ...............-127.7 dBc/Hz

• Full 3.3V or mixed 3.3V core/2.5V or 1.8V output supply voltage

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

• Available in lead-free (RoHS 6) package

9

10 11 12 13 14 15 16

32 31 30

29 28

27 26 25

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

M5

M6

M7

M8

N0

N1

nc

GND

XTAL_OUT

TEST_CLK

XTAL_SEL

VDDA

S_LOAD

S_DATA

S_CLOCK

MR

84021

32 Lead LQFP

7mm x 7mm x 1.4mm package body

Y Package

Top View

Block Diagram

Pin Assignment

Phase Detector

VCO

PLL

÷M

N

÷3

÷4

÷5

÷6

Configuration Interface Logic

0

1

0

1

OSC

VCO_SEL

OE1

XTAL_SEL

XTAL_IN

MR

S_LOAD

S_DATA

S_CLOCK

nP_LOAD

M[0:8]

N[0:1]

XTAL_OUT

TEST_CLK

TEST

Q0

Q1

Pullup

Pullup

Pullup

M5 Pullup; M[0:4, 6:8] Pulldown

Pullup

Pulldown

Pulldown

Pulldown

Pulldown

Pulldown

Pulldown

Pulldown

OE0