19-3229; Rev 0; 3/04
622 Mbps/1244Mbps Burst-Mode Limiting
Amplifier for GPON OLT Applications
General Description
The MAX3632 burst-mode limiting amplifier is designed
specifically for 622Mbps or 1244Mbps GPON (G.984)
optical line terminal (OLT) receiver applications.
Together with the MAX3630/MAX3631 burst-mode tran-
simpedance amplifiers (TIAs), a wide-dynamic-range
burst-mode signal current (from a PIN or avalanche
photodiode) can be translated to a differential LVPECL
output. The MAX3632 has an electrical input sensitivity
of 4mV
P-P
that supports GPON class-B optical sensitivi-
ty at 622Mbps with a PIN photodiode. An LVPECL-com-
patible burst reset input (RST) connected to the limiting
amplifier is used to control the offset correction loop of
the MAX3632 as required for burst-mode operation, as
well as to arm the threshold-setting circuitry of
MAX3630/MAX3631 TIAs.
The MAX3632 is available in a low-profile, 4mm x 4mm,
24-lead thin QFN package. It operates from a single
+3.3V power supply over a -40°C to +85°C temperature
range.
Features
♦
DC-Coupled Limiting Amplifier for Burst-Mode
GPON Applications
♦
Operates with Maxim’s Burst-Mode
Transimpedance Amplifier (MAX3630/MAX3631)
♦
LVPECL Data Output
♦
4mV
P-P
Input Sensitivity
♦
LVPECL Reset Input (RST)
♦
LVPECL
HOLD
Input for Optional Control Modes
♦
4mm x 4mm TQFN Package
MAX3632
Ordering Information
PART
MAX3632ETG
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
T2444-4
Applications
622Mbps GPON OLT Receivers
1244Mbps GPON OLT Receivers
-40°C to +85°C 24 Thin QFN
Pin Configuration appears at end of data sheet.
Typical Application Circuit
0.33μF
+3.3V
+3.3V
4-PIN TO HEADER
CAZ1
CAZ2
V
CC
MAX3634*
IN+
MAX3630/
MAX3631*
TIA
OUT+
SDI+
MAX3632
IN-
OUT-
50Ω
GND HOLD+
HOLD-
RST+
100Ω
V
CC
- 2V
+3.3V
CML (OR LVPECL**)
OUTPUT OLT
CONTROLLER
RST-
50Ω
SDI-
CLOCK PHASE
ALIGNER
*THE MAX3630/MAX3631 AND MAX3634 ARE FUTURE PRODUCTS.
**SEE FIGURE 5 FOR LVPECL INTERFACE.
________________________________________________________________
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.
622 Mbps/1244Mbps Burst-Mode Limiting
Amplifier for GPON OLT Applications
MAX3632
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
CC
) ................................ -0.5V to +4.5V
Voltage at IN+, IN-,
RST-, RST+, HOLD+, HOLD-,
CAZ1, CAZ2 ...........................................-0.5V to (V
CC
+ 0.5V)
LVPECL Output Current (OUT+, OUT-) ..............................50mA
Continuous Power Dissipation (T
A
= +85°C)
Derate 20.8mW/°C above +85°C ...............................1354mW
Operating Junction Temperature Range ...........-40°C to +125°C
Storage Temperature Range ............................-55°C to +150°C
Lead Temperature (soldering 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= -40°C to +85°C. Typical values at V
CC
= +3.3V, V
IN
= 4mV
P-P
, and T
A
= +25°C, unless otherwise noted.
Input (IN+, IN-) terminated with 100Ω resistors to V
CC
.) (Note 1)
PARAMETER
GENERAL SPECIFICATIONS
Data Rate
Power-Supply Current
Low-Frequency Cutoff
CAZ Leakage Current
Power-Supply Noise Rejection
INPUT SPECIFICATIONS (IN+, IN-)
Minimum Input Offset Tolerance
Input Resistance
Input Sensitivity
OUTPUT SPECIFICATIONS (OUT+, OUT-)
Random Jitter (Notes 1, 4, 5)
Deterministic Jitter (Notes 1, 4, 6)
LVPECL Output Low Voltage
LVPECL Output High Voltage
Data Output Edge Speed
RJ
DJ
V
OL
V
OH
622Mbps
1244Mbps
622Mbps
1244Mbps
Terminated 50Ω to
V
CC
- 2V
T
A
= 0°C to +85°C
T
A
= -40°C to 0°C
V
CC
- 1.81
V
CC
- 1.788
V
CC
-
1.025
150
28
18
14
14
40
22
30
30
V
CC
- 1.62
V
CC
- 1.588
V
CC
-
0.88
265
ps
RMS
ps
P-P
V
V
ps
R
IN
(Note 1)
Differential
BER = 10
-10
SYMBOL
CONDITIONS
MIN
TYP
622,
1244
MAX
UNITS
Mbps
100
30
25
mA
kHz
nA
dB
5
mV
Ω
mV
P-P
I
CC
(Note 2)
80
PSNR
f
≤
10MHz (Note 3)
24
168
, 2 -1 PRBS
23
232
2
Terminated 50Ω to V
CC
- 2V
20% to 80%
(Notes 1, 4, 5, 7)
2
_______________________________________________________________________________________
622 Mbps/1244Mbps Burst-Mode Limiting
Amplifier for GPON OLT Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= -40°C to +85°C. Typical values at V
CC
= +3.3V, V
IN
= 4mV
P-P
, and T
A
= +25°C, unless otherwise noted.
Input (IN+, IN-) terminated with 100Ω resistors to V
CC
.)
PARAMETER
LVPECL-Differential Input Voltage
LVPECL Input Common-Mode
Range
LVPECL Input Current
SYMBOL
V
IN
V
CM
CONDITIONS
MIN
200
V
CC
-
1.49
-150
V
CC
-
1.32
TYP
MAX
1600
V
CC
-
V
IN
/4
190
UNITS
mV
P-P
V
µA
LVPECL INPUT SPECIFICATIONS (RST+,
RST-, HOLD+, HOLD-)
(Note 8)
MAX3632
Note 1:
AC parameters are guaranteed by design and characterization.
Note 2:
Supply current is measured with LVPECL data outputs open.
Note 3:
PSNR is measured on the differential output signal while applying a 100mV
P-P
sinusoidal signal at the power supply with the
input open, and the DC cancellation loop activated.
Note 4:
Input-data transition time controlled by 4th order bessel filter with f
-3dB
= 0.75 x data rate. The deterministic jitter caused by
this filter is not included in the DJ specifications.
Note 5:
Measured with a repeating 0000011111 data pattern at 1244Mbps.
Note 6:
Deterministic jitter is measured at the differential-output eye crossing. Peak-to-peak input deterministic jitter is subtracted
from peak-to-peak output deterministic jitter.
Note 7:
Each output (OUT+, OUT-) terminated with R
LOAD
= 50Ω and C
LOAD
= 4pF.
Note 8:
The
HOLD
input transition time, 20% to 80%, must be less than 0.3ns for timing method 3. See Figure 10.
Typical Operating Characteristics
(Input signal is unfiltered, V
CC
= +3.3V, T
A
= +25°C, unless otherwise specified.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX3632 toc01
TRANSFER FUNCTION
(OUTPUT VOLTAGE vs. INPUT VOLTAGE)
MAX3632 toc02
RANDOM JITTER
vs. INPUT AMPLITUDE
MAX3632 toc03
120
110
SUPPLY CURRENT (mA)
100
90
80
70
60
-40
-15
10
35
60
2000
DIFFERENTIAL OUTPUT VOLTAGE (mV
P-P
)
1700
1400
1100
800
500
200
60
50
RANDOM JITTER (ps rms)
40
30
933MHz INPUT FILTER
20
NO INPUT FILTER
10
0
467MHz INPUT FILTER
85
0
1
10
100
1000
1
10
100
1000
TEMPERATURE (°C )
DIFFERENTIAL INPUT VOLTAGE (mV
P-P
)
DIFFERENTIAL INPUT AMPLITUDE (mV
P-P
)
_______________________________________________________________________________________
3
622 Mbps/1244Mbps Burst-Mode Limiting
Amplifier for GPON OLT Applications
MAX3632
Typical Operating Characteristics (continued)
(Input signal is unfiltered, V
CC
= +3.3V, T
A
= +25°C, unless otherwise specified.)
DETERMINISTIC JITTER
vs. INPUT AMPLITUDE
MAX3632 toc04
BIT-ERROR RATIO
vs. INPUT AMPLITUDE
MAX3632 toc05
ELECTRICAL EYE DIAGRAM
(4mV
P-P
INPUT, 622Mbps)
MAX3632 toc06
45
40
DETERMINISTIC JITTER (ps
P-P
)
35
INPUT JITTER MEASURED
AT EYE CROSSING
1.0E-04
1.0E-05
BIT-ERROR RATIO
1.0E-06
1.0E-07
1.0E-08
1.0E-09
1.0E-10
622Mbps
1244Mbps
30
25
20
15
10
5
1
10
100
1000
DIFFERENTIAL INPUT AMPLITUDE (mV
P-P
)
2
7
-1 PRBS + 72 CID
1.0
1.4
1.8
2.2
2.6
3.0
DIFFERENTIAL INPUT AMPLITUDE (mV
P-P
)
ELECTRICAL EYE DIAGRAM
(800mV
P-P
INPUT, 622Mbps)
MAX3632 toc07
ELECTRICAL EYE DIAGRAM
(4mV
P-P
INPUT, 1244Mbps)
MAX3632 toc08
ELECTRICAL EYE DIAGRAM
(800mV
P-P
INPUT, 1244Mbps)
MAX3632 toc09
RESET TIMING DIAGRAM
INPUT DATA (IN)
MAX3632 toc10
RESET SIGNAL (RST)
COMMON-MODE RESET
OUTPUT (IN)
DATA OUTPUT (OUT)
4
_______________________________________________________________________________________
622 Mbps/1244Mbps Burst-Mode Limiting
Amplifier for GPON OLT Applications
Pin Description
PIN
1, 6, 7,
13, 19, 24
2, 5, 10, 14,
17, 20, 21
3
4
8
9
11
12
15
16
18
22
23
EP
NAME
GND
V
CC
IN+
IN-
RST+
RST-
HOLD+
HOLD-
OUT-
OUT+
N.C.
CAZ2
CAZ1
Exposed
Paddle
Ground
+3.3V Supply Voltage
Positive Data Input, Common-Mode Reset Output
Negative Data Input, Common-Mode Reset Output
Positive Burst-Mode Reset Input, LVPECL Compatible
Negative Burst-Mode Reset Input, LVPECL Compatible
Positive Offset Correction Loop Hold Input, LVPECL Compatible
Negative Offset Correction Loop Hold Input, LVPECL Compatible
Negative Data Output, LVPECL
Positive Data Output, LVPECL
No External Connection. Leave open.
Offset Correction Loop Capacitor Connection. Place a 330nF capacitor between CAZ1 and
CAZ2.
Offset Correction Loop Capacitor Connection. Place a 330nF capacitor between CAZ1 and
CAZ2.
Ground. Must be soldered to the circuit board ground for proper thermal and electrical
performance (see
Exposed Pad (EP) Package
section).
FUNCTION
MAX3632
Detailed Description
The MAX3632 burst-mode limiting amplifier is designed
for 622Mbps or 1244Mbps GPON OLT receiver appli-
cations. It operates, together with the MAX3630/
MAX3631 burst-mode transimpedance amplifiers, to
convert current from a photodiode into an LVPECL out-
put signal. The MAX3632 contains a data input stage, a
gain stage, an offset correction loop, a reset and hold
section, and an LVPECL output buffer.
CAZ1
C
AZ
CAZ2
MAX3632
IN+
200Ω
IN-
INPUT STAGE
INPUT
BUFFER
OFFSET
CORRECTION
OUT+
GAIN
STAGE
OUTPUT
BUFFER
OUT-
Input Stage
The MAX3632 input stage provides a 200Ω differential
termination and buffers the data input signal. Using a
proprietary common-mode signaling technique, the
input stage of the MAX3632 also sends the burst-mode
reset signal from the
RST
inputs (RST+,
RST-)
to the
MAX3630/MAX3631 TIAs. By using the common mode
of the differential pair for the TIAs burst-mode reset sig-
nal, the MAX3630/MAX3631 TIAs can be assembled
into 4-pin TO headers that reduce assembly costs and
complexity. For proper operation of the reset signal, the
MAX3630/MAX3631 data outputs (OUT+, OUT-) must
be DC-coupled to the MAX3632 data inputs (IN+, IN-).
RST+
RESET AND HOLD
LOGIC / SIGNALING
RST-
HOLD+
HOLD-
Figure 1. Functional Diagram
_______________________________________________________________________________________
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