MAX9491 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Factory-Programmable, Single PLL Clock Generator

19-3942; Rev 0; 1/06
Factory-Programmable, Single PLL
Clock Generator
General Description
The MAX9491 multipurpose clock generator is ideal for
communication applications. It offers a factory-program-
mable PLL output that can be set to almost any frequency,
ranging from 4MHz to 200MHz. The MAX9491 uses a
one-time-programmable (OTP) ROM to program the PLL
output. The MAX9491 also features an integrated volt-
age-controlled crystal oscillator (VCXO) that is tuned by a
DC voltage. The VCXO output is used as the PLL input.
The VCXO has a wide ±200ppm (typ) tuning range. The
OTP on the MAX9491 is factory preset, based upon the
customer request. Contact the factory for samples with
preferred frequencies.
The device operates from a 3.3V supply and is speci-
fied over the -40°C to +85°C extended temperature
range. The MAX9491 is available in 14-pin TSSOP and
20-pin TQFN (5mm x 5mm) packages.
Features
♦ 5MHz to 35MHz for Crystal-Clock Reference
♦ 5MHz to 50MHz for a Driver Clock Reference
♦ One Fractional-N PLL with Buffered Output
♦ 4MHz to 200MHz Output Frequency Range
♦ Low RMS Jitter PLL (< 13ps) at 197 MHz
♦ Integrated VCXO with ±200ppm Tuning Range
♦ Available in 14-Pin TSSOP and 20-Pin TQFN
Packages
♦ +3.3V Supply
♦ -40°C to +85°C Temperature Range
Applications
Telecommunications
Data Networking Systems
Home Entertainment Centers
SOHO
Ordering Information
PART
MAX9491ETP
MAX9491EUD*
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
20 TQFN-EP**
14 TSSOP
PKG
CODE
T2055-5
U14-2
*Future product—contact factory for availability.
**EP = Exposed pad.
Pin Configurations
TOP VIEW
15 14 13 12 11
V_DD 16
X2 17
X1 18
I.C. 19
I.C. 20
MAX9491
10 GND
9 I.C.
8 I.C.
7 I.C.
6 I.C.
12345
TQFN (5mm x 5mm)
TOP VIEW
X1 1
I.C. 2
I.C. 3
V_DD 4
TUNE 5
GND 6
CLK_OUT 7
MAX9491
14 X2
13 PD
12 V_DD
11 GND
10 I.C.
9 GND
8 I.C.
TSSOP
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