Rainbow Electronics MAX9491 - Manual

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.
Applications
Telecommunications
Data Networking Systems
Home Entertainment Centers
SOHO
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
MAX9491
Factory-Programmable, Single PLL
Clock Generator
________________________________________________________________ Maxim Integrated Products 1
15 14 13 12
PD I.C. V
DD
V
DD
11
GND
8
7
6
9
10
I.C.
I.C.
I.C.
GND
I.C.
19
18
17
16
I.C.
X1
X2
V DD
20 I.C.
1 2 3 4
TUNE V
DDA
AGND
GND
5
CLK_OUT
MAX9491
TOP VIEW
TQFN (5mm x 5mm)
Pin Configurations
19-3942; Rev 0; 1/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE
PIN-
PACKAGE PKG
CODE
MAX9491ETP -40°C to +85°C 20 TQFN-EP** T2055-5
MAX9491EUD* -40°C to +85°C 14 TSSOP U14-2
Ordering Information
*Future product—contact factory for availability.
**EP = Exposed pad.
14
13
12
11
10
9
8
1
2
3
4
5
6
7
X2
V DD
GND V DD
I.C.
I.C.
X1
TOP VIEW
I.C.
GND
I.C. CLK_OUT
GND
TUNE
MAX9491
TSSOP
PD