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MAX9491ETP045+

P1-P3P4-P6P7-P9P10-P11
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
20I.C.
1234
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
GNDV
DD
I.C.
I.C.
X1
TOP VIEW
I.C.
GND
I.C.
CLK_OUT
GND
TUNE
MAX9491
TSSOP
PD
MAX9491
Factory Programmable Single PLL
Clock Generator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
DD
= V
DDA
= +3.0V to +3.6V and T
A
= -40°C to +85°C. Typical values at V
DD
= V
DDA
= 3.3V, T
A
= +25°C, unless otherwise noted.)
(Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND...........................................................-0.3V to +4.0V
V
DDA
to AGND ......................................................-0.3V to +4.0V
All Other Pins to GND ..................................-0.3V to V
DD
+ 0.3V
Short-Circuit Duration
(all LVCMOS outputs)..............................................Continuous
ESD Protection (Human Body Model)..................................±2kV
Continuous Power Dissipation (T
A
= +70°C)
20-Lead TQFN (derate 21.3mW/°C above +70°C) ....2758mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ......796.8mW
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LVCMOS INPUTS (PD, X1 as a reference INPUT CLK)
Input High Level V
IH
2.0 V
DD
V
Input Low Level V
IL
0 0.8 V
High-Level Input Current I
IH
V
IN
= V
DD
20 µA
Low-Level Input Current I
IL
V
IN
= 0 -20 µA
CLOCK OUTPUT (CLK_OUT)
Output High Level V
OH
I
OH
= -4mA
V
DD
-
0.6
V
Output Low Level V
OL
I
OL
= 4mA 0.4 V
POWER SUPPLIES
Digital Power-Supply Voltage V
DD
3.0 3.6 V
Analog Power-Supply Voltage V
DDA
3.0 3.6 V
Total Current for Digital and
Analog Supplies
I
DC
f
OUT
= 45MHz, no load
f
IN
= 13MHz
10 mA
Power-Down Current I
DC
2 PD
= low 60 µA
MAX9491
Factory Programmable Single PLL
Clock Generator
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
DD
= V
DDA
= +3.0V to +3.6V, C
L
= 10pF and T
A
= -40°C to +85°C. Typical values are at V
DD
= V
DDA
= 3.3V, T
A
= +25°C, unless
otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT CLOCK (CLK_OUT)
Minimum Frequency Range f
IN
= 5MHz to 50MHz 4
Maximum Frequency Range
f
OUT
C
L
< 5pF 133 200
MHz
Clock Rise Time t
R
20% to 80% of V
DD
, f
OUT
= 80MHz,
f
IN
= 13MHz
1.5 ns
Clock Fall Time t
F
80% to 20% of V
DD
, f
OUT
= 80MHz,
f
IN
= 13MHz
1.3 ns
Duty Cycle f
OUT
= 45MHz, f
IN
= 13MHz 44 50 56 %
f
OUT
= 45MHz, f
IN
= 13MHz 14
f
OUT
= 80MHz, f
IN
= 13MHz 22Output Period Jitter J
P
f
OUT
= 197MHz, f
IN
= 13MHz 13
ps
RMS
Soft Power-On Time t
PO2
PD from low to high, f
OUT
= 45MHz,
f
IN
= 13MHz, see Figure 2
1ms
Hard Power-On Time t
PO1
See Figure 2 15 ms
VCXO CLOCK
Crystal Frequency f
XTL
27 MHz
Crystal Accuracy ±30 ppm
Tuning Voltage Range V
TUNE
03V
VCXO Tuning Range V
TUNE
= 0 to 3V, C
1
= C
2
= 4pF ±150 ±200 ppm
TUNE Input Impedance Z
TUNE
95 kΩ
Output CLK Accuracy V
TUNE
= 1.5V, C
1
= C
2
= 4pF ±50 ppm
Note 1: All parameters are tested at T
A
= +25°C. Specifications over temperature are guaranteed by design and characterization.
Note 2: Guaranteed by design and characterization; limits are set at ±6 sigma.
P1-P3P4-P6P7-P9P10-P11

MAX9491ETP045+

Mfr. #:
Buy MAX9491ETP045+
Manufacturer:
Maxim Integrated
Description:
Clock Generators & Support Products Factory-Prog Single PLL Clock Generator
Lifecycle:
New from this manufacturer.
Delivery:
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