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PDF MAX3670EGJ Data sheet ( Hoja de datos )
| Número de pieza | MAX3670EGJ | |
| Descripción | Low-Jitter 155MHz/622MHz Clock Generator | |
| Fabricantes | Maxim Integrated | |
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19-2166; Rev 0; 9/01
Low-Jitter 155MHz/622MHz
Clock Generator
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
o Single +3.3V or +5.0V Supply
o Power Dissipation: 150mW at +3.3V Supply
o External VCO Center Frequencies (fVCO): 155MHz
to 670MHz
o Reference Clock Frequencies: fVCO, fVCO/2,
fVCO/8
o Main Clock Output Frequency: fVCO
o Optional Output Clock Frequencies: fVCO, fVCO/2,
fVCO/4, fVCO/8
o Low Intrinsic Jitter: <0.4psRMS
o Loss-of-Lock Indicator
o PECL Clock Output Interface
Ordering Information
PART
MAX3670EGJ
*Exposed pad
TEMP. RANGE PIN-PACKAGE
-40°C to +85°C 32 QFN-EP* (5mm x 5mm)
Pin Configuration appears at end of data sheet.
Typical Application Circuit
155MHz
3.3V 142Ω
VCO
KVCO = 25kHz/V
155MHz
142Ω
REFCLK+
REFCLK-
3.3V
VCCD
VCOIN+
100Ω
VCOIN-
MAX3670
MOUT+
MOUT-
142Ω
142Ω
RSEL N.C.
VSEL N.C.
0.01µF
332Ω
4700pF
500kΩ
4700pF
500kΩ
VC
OPAMP-
OPAMP+
POLAR
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
GSEL1
GSEL2
GSEL3
N.C.
GND 3.3V
SETUP FOR 10kHz LOOP
BANDWIDTH
MAX3892
16:1
SERIALIZER
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Low-Jitter 155MHz/622MHz
Clock Generator
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
60
5.0V
50
3.3V
40
30
20
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
280
270
260
250
240
230
220
210
200
190
180
170
160
150
-40
EDGE SPEED
vs. TEMPERATURE
622.08MHz
155.52MHz
-20 0 20 40 60
TEMPERATURE (°C)
80
POWER-SUPPLY REJECTION
vs. FREQUENCY
0
BW = 1kHz
HOP = 5kHz
-10
-20
-30 LOOP FILTER OUTPUT
-40
-50
-60
1k
10k 100k 1M
FREQUENCY (Hz)
10M
622MHz CLOCK OUTPUT
(DIFFERENTIAL OUTPUT)
155MHz CLOCK OUTPUT
(DIFFERENTIAL OUTPUT)
200mV/
div
500ps/div
200mV/
div
2.0ns/div
_______________________________________________________________________________________ 5
5 Page 
Low-Jitter 155MHz/622MHz
Clock Generator
Interface Schematics (continued)
VCC LOL
Figure 2. Output Interface
OUT+
OUT-
MAX3670
60kΩ
0.6V
REFCLK
VCO
60kΩ
MAX3670
THADJ
CTH
Figure 3. Loss-of-Lock Indicator
Pin Configuration
Chip Information
TRANSISTOR COUNT: 2478
32 31 30 29 28 27 26 25
C2+ 1
24 VCOIN+
C2- 2
23 VCOIN-
VCCD 3
22 VCCO
THADJ 4
CTH 5
MAX3670*
21 MOUT+
20 MOUT-
GSEL1 6
19 VCCO
GSEL2 7
18 POUT+
GSEL3 8
9
17 POUT-
10 11 12 13 14 15 16
*THE EXPOSED PAD MUST BE SOLDERED TO SUPPLY GROUND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX3670EGJ.PDF ] | |
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