___________________________________________________ Typical Operating Circuit
_____________________ General Description
The MAX3675 is a complete clock-recovery and data-
retiming IC incorporating a limiting amplifier. It is
intended for 622Mbps SDH/SONET applications and
operates from a single +3.3V supply.
The MAX3675 has two differential input amplifiers: one
accepts PECL levels, while the other accepts small-sig-
nal analog levels. The analog inputs access the limiting
amplifier stage, which provides both a received-signal-
strength indicator (RSSI) and a programmable-threshold
loss-of-power (LOP) monitor. Selecting the PECL amplifier
disables the limiting amplifier, conserving power. A loss-
of-lock (LOL) monitor is also incorporated as part of the
fully integrated PLL.
________________________Applications
SDH/SONET Transmission Systems
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects
____________________________Features
o
Single +3.3V or +5.0V Power Supply
o
Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
o
Low Power: 215mW at +3.3V
o
Selectable Data Inputs, Differential PECL or
Analog
o
Received-Signal-Strength Indicator (RSSI)
o
Loss-of-Power and Loss-of-Lock Monitors
o
Differential PECL Clock and Data Outputs
o
No External Reference Clock Required
MAX3675
622Mbps, Low-Power, 3.3V Clock-Recovery
and Data-Retiming IC with Limiting Amplifier
________________________________________________________________
Maxim Integrated Products
1
V
CC
Z
O
= 50
100
100k
INREF
FILT
OUT+
C
IN
0.01
F
C
IN
0.01
F
C
OLC
33nF
C
F
47nF
+3.3V
220pF
100pF
PHOTO-
DIODE
ADI+
DDI-
DDI+
SDO+
SDO-
0.1
F
C
LOL
0.01
F
0.01
F
ADI-
CFILT OLC+ OLC-
R1
R2
GND
RSSI
INV
VTH LOP
LOL
INSEL
PHADJ+ PHADJ- FIL+
52.3
1%
2.2
F
FIL-
OUT-
GND
COMP
IN
Z
O
= 50
+3.3V
V
CC
SCLKO+
SCLKO-
Z
O
= 50
Z
O
= 50
+3.3V
+3.3V
82
82
130
130
Z
O
= 50
Z
O
= 50
+3.3V
82
82
130
130
MAX3675
MAX3664
19-1258; Rev 2; 11/98
PART
MAX3675ECJ
-40C to +85C
TEMP. RANGE
PIN-PACKAGE
32 TQFP
_________________Ordering Information
Pin Configuration appears at end of data sheet.
*Contact factory for availability. Dice are designed to operate
from -40C to +85C, but are tested and guaranteed only at
Tj = +45C.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
EVALUATION KIT MANUAL
AVAILABLE
MAX3675EHJ
-40C to +85C
5mm 32 TQFP
MAX3675E/D
-40C to +85C
Dice*
MAX3675
622Mbps, Low-Power, 3.3V Clock-Recovery
and Data-Retiming IC with Limiting Amplifier
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Notes 1, 2)
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, V
CC
..............................................-0.5V to +6.5V
Input Voltage Levels,
DDI+, DDI-, ADI+, ADI- ...........................-0.5V to (V
CC
+ 0.5V)
Input Differential Voltage (ADI+) - (ADI-)...............................3V
PECL Output Currents, SDO+, SDO-, SCLKO+, SCLKO-...100mA
LOL, LOP, INSEL, PHADJ+, PHADJ- .........-0.5V to (V
CC
+ 0.5V)
FIL+, FIL-, OLC+, OLC-, RSSI, VTH ...........-0.5V to (V
CC
+ 0.5V)
(OLC+) - (OLC-).....................................................................3V
(FIL+) - (FIL-) ..................................................................700mV
CFILT ...............................................(V
CC
- 2.5V) to (V
CC
+ 0.5V)
INV.........................................................................-0.5V to +2.0V
Continuous Power Dissipation (T
A
= +85C)
TQFP (derate 11.1mW/C above +85C) .....................721mW
Operating Junction Temperature Range ...........-40C to +150C
Storage Temperature Range .............................-65C to +160C
Processing Temperature (die) .........................................+400C
Lead Temperature (soldering, 10sec) .............................+300C
1M
between INV and VTH
MAX3675ECJ,
PECL outputs
unterminated
1M
between INV and VTH
C
LOL
= 0.01F
(ADI+) - (ADI-) = 20mVp-p
ADI+, ADI- open
CONDITIONS
V
1.10
1.18
1.30
INV Input Bias Voltage
nA
-100
+100
Op-Amp Input Bias Current
V
RSSI Output Voltage
2.00
2.12
2.30
1.22
V
V
CC
- 0.7
V
CC
- 0.6
V
CC
- 0.5
ADI+, ADI- Input Bias Voltage
V
V
CC
- 1.16
V
CC
- 0.88
V
IH
PECL Input High Voltage
47
65
65
90
V
0.44
V
OL
LOL Low Voltage
V
0.1
0.4
V
OL
LOP Low Voltage
V
2.4
V
OH
LOP, LOL High Voltage
V
V
CC
- 1.81
V
CC
- 1.620
V
OL
PECL Output Low Voltage
V
V
CC
- 1.81
V
CC
- 1.48
V
IL
PECL Input Low Voltage
A
-10
10
I
IH
PECL Input High Current
A
-10
10
I
IL
PECL Input Low Current
V
V
CC
- 1.03
V
CC
- 0.88
V
OH
PECL Output High Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
INSEL = V
CC
INSEL = GND
Note 1:
Dice are tested at T
j
= +45C, V
CC
= +4.25V
Note 2:
At T
A
= -40C, DC characteristics are guaranteed by design and characterization.
mA
I
CC
Supply Current
(ADI+) - (ADI-) = 80mVp-p
2.38
2.51
2.70
C
F
= 0.022F
MAX3675
622Mbps, Low-Power, 3.3V Clock-Recovery
and Data-Retiming IC with Limiting Amplifier
_______________________________________________________________________________________
3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25C.)
(Notes 3, 4)
Note 3:
AC parameters are guaranteed by design and characterization.
Note 4:
The MAX3675 is characterized with a PRBS of 2
23
- 1 maintaining a BER of
10
-10
having a confidence level of 99.9%.
Note 5:
A lower minimum input voltage of 2mVp-p is achievable; however, the LOP hysteresis is not guaranteed below 3.6mVp-p.
Note 6:
Hysteresis = 20log(V
RELEASE
/ V
ASSERT
)
Note 7:
Small-signal bandwidth cannot be measured directly.
Note 8:
RSSI slope = [V
RSSI2
- V
RSSI1
] / [20log (V
ID2
/ V
ID1
)]
Note 9:
1UI = 1 unit interval = (622.08MHz)
-1
= 1.608ns
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
RSSI Output Voltage
1.36
Limiting Amplifier Small-Signal Bandwidth
BW
800
MHz
Power-Detect Hysteresis
2
3
5
dB
Input Referred Noise
V
N
100
V
Threshold Voltage
V
TH
1.40
V
13
mUI
Differential Input Voltage Range
V
ID
0.003
1.2000
Vp-p
Jitter Generation (Note 9)
6
CONDITIONS
(ADI+) - (ADI-) = 2mVp-p
(Note 7)
V
RELEASE
= 3.6mVp-p (Note 6)
ADI inputs
V
RELEASE
= 3.6mVp-p
C
F
= 2.2F, R
F
= 52.3
BER < 10
-10
, ADI inputs (Note 5)
1.93
V
(ADI+) - (ADI-) = 20mVp-p
Jitter-Transfer Peaking
0.08
dB
Maximum Consecutive Input
Run Length (1 or 0)
1000
Bits
Serial Clock-to-Q Delay
t
CLK-Q
195
275
370
ps
Serial Clock Frequency
f
SCLK
622.08
MHz
R
F
= 52.3
, C
F
= 2.2F
8
R
F
= 52.3
,
C
F
= 2.2F
1.50
3.35
Jitter Tolerance (Note 9)
0.25
0.60
0.20
0.50
3.5
MHz
C
F
= 2.2F, R
F
= 52.3
Loop Bandwidth
350
kHz
29
RSSI Linearity
0.7
%
(ADI+) - (ADI-) = 2mVp-p to 50mVp-p
RSSI Slope
mV/dB
(ADI+) - (ADI-) = 2mVp-p to
50mVp-p (Note 8)
UI
f = 10kHz
f = 25kHz
f = 250kHz
f = 1MHz
C
F
= 0.022F, R
F
= 523
C
F
= 0.022F, R
F
= 523
MAX3675
622Mbps, Low-Power, 3.3V Clock-Recovery
and Data-Retiming IC with Limiting Amplifier
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
380ps/div
CLOCK
DATA
RECOVERED DATA AND
CLOCK (SINGLE ENDED)
MAX3675 TOC01
JITTER FREQUENCY (Hz)
2
23
-1 PATTERN
V
CC
= +3.3V
R
F
= 520
C
F
= 0.022
F
20ps/div
RECOVERED CLOCK JITTER
MAX3675 TOC02
JITTER FREQUENCY (Hz)
2
23
-1 PATTERN
V
CC
= +3.3V
R
F
= 520
C
F
= 0.022
F
RMS
= 12.8ps
10
-2
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
10
-10
600
800
700
900
1m
1.1m 1.2m 1.3m
BIT ERROR RATE
vs. INPUT VOLTAGE
MAX3675 TOC03
INPUT VOLTAGE (Vp-p)
BIT ERROR RATE
2
23
-1 PATTERN
V
CC
= +3.3V
10
0.1
10k
100k
1M
JITTER TOLERANCE
MAX3675 TOC04
JITTER FREQUENCY (Hz)
INPUT JITTER (UIp-p)
1
2
23
-1 PATTERN
V
CC
= +3.3V
R
F
= 52.3
C
F
= 2.2
F
BELLCORE
MASK
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
-2.2
-2.4
-2.6
-2.8
-3.0
2k
10k
100k
700k
JITTER TRANSFER
MAX3675 TOC05
JITTER FREQUENCY (Hz)
JITTER TRANSFER (dB)
2
23
-1 PATTERN
V
CC
= +3.3V
RF = 52.3
CF = 2.2
F
BELLCORE
MASK
MAX3675
622Mbps, Low-Power, 3.3V Clock-Recovery
and Data-Retiming IC with Limiting Amplifier
_______________________________________________________________________________________
5
____________________________Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
2.0
2.6
2.4
2.2
2.8
3.0
3.2
3.4
3.6
3.8
4.0
-40
0
-20
20
40
60
80
LOSS-OF-POWER
HYSTERESIS vs. TEMPERATURE
MAS3675 TOC06
AMBIENT TEMPERATURE (C)
HYSTERESIS (dB)
2
23
-1 PATTERN
V
CC
= +3.3V OR +5.0V
2.8
1.2
100
10m
100m
1m
1
RECEIVED-SIGNAL-STRENTH INDICATOR
vs. INPUT VOLTAGE
1.4
1.6
MAX3675 TOC07
INPUT VOLTAGE (Vp-p)
RSSI (V)
1.8
2.0
2.2
2.4
2.6
V
CC
= +3.3V
2
23
-1 PATTERN
1010 PATTERN
100m
1m
1.3
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
LOSS-OF-POWER
ASSERT AND RELEASE LEVEL
vs. THRESHOLD VOLTAGE
MAX4108/9-08
DETECTOR THRESHOLD VOLTAGE, V
TH
(V)
ANALOG INPUT VOLTAGE (Vp-p)
10m
LOP RELEASE
LOP ASSERT
2
23
-1 PATTERN
V
CC
= +3.3V
2.8
1.2
100
10m
100m
1m
1
RECEIVED-SIGNAL-STRENGTH INDICATOR
vs. INPUT VOLTAGE
1.4
1.6
MAX3675 TOC09
INPUT VOLTAGE (Vp-p)
RSSI (V)
1.8
2.0
2.2
2.4
2.6
V
CC
= 5.0V
V
CC
= 3.3V
2
23
-1 PATTERN
30
50
40
70
60
80
90
-40
0
20
-20
40
60
80
SUPPLY CURRENT
vs. TEMPERATURE
MAX3675 TOC10
AMBIENT TEMPERATURE (C)
SUPPLY CURRENT (mA)
V
CC
= 3.3V
V
CC
= 5.0V
PDF 
ZIP