OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX3670EGJ

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX3670 is a low-jitter 155MHz/622MHz reference
clock generator IC designed for system clock distribution
and frequency synchronization in OC-48 and OC-192
SONET/SDH and WDM transmission systems. The
MAX3670 integrates a phase/frequency detector, an
operational amplifier (op amp), prescaler dividers and
input/output buffers. Using an external VCO, the
MAX3670 can be configured easily as a phase-lock loop
with bandwidth programmable from 15Hz to 20kHz.
The MAX3670 operates from a single +3.3V or +5.0V
supply, and dissipates 150mW (typ) at 3.3V. The operat-
ing temperature range is from -40°C to +85°C. The chip
is available in a 5mm ✕ 5mm, 32-pin QFN package.
Applications
OC-12 to OC-192 SONET/WDM Transport
Systems
Clock Jitter Clean-Up and Frequency
Synchronization
Frequency Conversion
System Clock Distribution
Features
♦ Single +3.3V or +5.0V Supply
♦ Power Dissipation: 150mW at +3.3V Supply
♦ External VCO Center Frequencies (f
VCO
): 155MHz
to 670MHz
♦ Reference Clock Frequencies: f
VCO
, f
VCO
/2, f
VCO
/8
♦ Main Clock Output Frequency: f
VCO
♦ Optional Output Clock Frequencies: f
VCO
, f
VCO
/2,
f
VCO
/4, f
VCO
/8
♦ Low Intrinsic Jitter: < 0.4ps
RMS
♦ Loss-of-Lock Indicator
♦ PECL Clock Output Interface
MAX3670
Low-Jitter 155MHz/622MHz
Clock Generator
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX3670
155MHz
142Ω
142Ω
100Ω
332Ω
500kΩ
500kΩ
3.3V
3.3V
4700pF
4700pF
0.01μF
SETUP FOR 10kHz LOOP
BANDWIDTH
3.3V
N.C.
N.C.
N.C.
142Ω
142Ω
REFCLK+
REFCLK-
VCOIN+
VCOIN-
VC
OPAMP-
OPAMP+
POLAR GND
MOUT+
MOUT-
RSEL
VSEL
GSEL1
GSEL2
GSEL3
VCO
K
VCO
= 25kHz/V
155MHz
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
VCCD
MAX3892
16:1
SERIALIZER
Typical Application Circuit
19-2166; Rev 2; 9/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Pin Configuration appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3670EGJ -40°C to +85°C 32 QFN-EP*
MAX3670ETJ+ -40°C to +85°C 32 Thin QFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
E V A L U A T I O N K I T A V A I L A B L E
MAX3670
Low-Jitter 155MHz/622MHz
Clock Generator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±10% or V
CC
= +5.0V ±10%, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless other-
wise 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.
Supply Voltage Range..............................................-0.5V to +7V
Voltage Range at C2+, C2-, THADJ, CTH, GSEL1, GSEL2,
GSEL3, LOL, RSEL, REFCLK-, REFCLK+, VSEL, VCOIN+,
VCOIN-, VC, POLAR, PSEL1, PSEL2, COMP,
OPAMP+, OPAMP- ..................................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
32 QFN (derate 33.3mW/°C above +70°C) .....................2.7W
32 Thin QFN (derate 34.5mW/°C above +70°C)..............2.8W
PECL Output Current (MOUT+,
MOUT-, POUT+, POUT-).................................................56mA
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range. ............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
CC
(Note 2) 48 72 mA
INPUT SPECIFICATIONS (REFCLK±, VCOIN±)
Input High Voltage V
IH
V
CC
-
1.16
V
CC
-
0.88
V
Input Low Voltage V
IL
V
CC
-
1.81
V
CC
-
1.48
V
Input Bias Voltage
V
CC
-
1.3
V
Common-Mode Input Resistance 7.5 11.5 17.5 kΩ
Differential Input Resistance 12.8 21.0 32.5 kΩ
Differential Input Voltage Swing AC-coupled 300 1900 mVp-p
PECL OUTPUT SPECIFICATIONS
0°C to +85°C
V
CC
-
1.025
V
CC
-
0.88
Output High Voltage V
OH
-40°C to 0°C
V
CC
-
1.085
V
CC
-
0.88
V
0°C to +85°C
V
CC
-
1.81
V
CC
-
1.62
Output Low Voltage V
OL
-40°C to 0°C
V
CC
-
1.83
V
CC
-
1.556
V
TTL SPECIFICATIONS
Output High Voltage V
OH
Sourcing 20µA 2.4 V
CC
V
Output Low Voltage V
OL
Sinking 2mA 0.4 V
MAX3670
Low-Jitter 155MHz/622MHz
Clock Generator
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V ±10% or V
CC
= +5.0V ±10%, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless other-
wise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OPERATIONAL AMPLIFIER SPECIFICATIONS (Note 3)
V
CC
= +3.3V ±10% 0.3
V
CC
-
0.3
Op Amp Output Voltage Range V
O
V
CC
= +5.0V ±10% 0.5
V
CC
-
0.5
V
Op Amp Input Offset Voltage | V
OS
| 3mV
Op Amp Open-Loop Gain A
OL
90 dB
PHASE FREQUENCY DETECTOR (PFD)/CHARGE-PUMP (CP) SPECIFICATIONS (Note 4)
High gain 16 20 24.4
Full-Scale PFD/CP Output
Current
| I
PD
|
Low gain 4 5 6.2
µA
High gain 0.80
PFD/CP Offset Current
Low gain 1.08
%
| I
PD
|
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±10% or V
CC
= +5.0V ±10%, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless other-
wise noted.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CLOCK OUTPUT SPECIFICATIONS
Clock Output Frequency 670 MHz
f
VCO
= 622MHz
622/311/
155/78
Optional Clock Output
Frequency
f
VCO
= 155MHz
155/78/
38/19
MHz
Clock Output Rise/Fall Time Measured from 20% to 80% 280 ps
Clock Output Duty Cycle (Note 6) 45 55 %
NOISE SPECIFICATIONS
Random Noise Voltage at Loop-
Filter Output
V
NOISE
Freq > 1kHz (Note 7) 1.14
µV
RMS
/√Hz
Spurious Noise Voltage at Loop-
Filter Output
(Note 8) 50 µV
RMS
Power-Supply Rejection at Loop-
Filter Output
PSR (Note 9) 30 dB
REFERENCE CLOCK INPUT SPECIFICATIONS
Reference Clock Frequency
622/
155/78
670 MHz
Reference Clock Duty Cycle 30 70 %
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX3670EGJ

Mfr. #:
Buy MAX3670EGJ
Manufacturer:
Microchip / Microsemi
Description:
Clock Generators & Support Products
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet