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MAX3942ETG+

P1-P3P4-P6P7-P9P10-P10
Typical Application Circuit
General Description
The MAX3942 is designed to drive high-speed optical
modulators at data rates up to 10.7Gbps. It functions as
a modulation circuit, with an integrated control op amp
externally programmed by a DC voltage.
A high-bandwidth, fully differential signal path is inter-
nally implemented to minimize jitter accumulation. When
a clock signal is available, the integrated data-retiming
function can be selected to reject input-signal jitter.
The MAX3942 receives differential CML signals (ground-
referenced) with on-chip line terminations of 50Ω. Each
of the differential outputs has an on-chip 50Ω resistor for
back termination. The driver is able to deliver a modula-
tion current of 40mA
P-P
to 120mA
P-P
, with an edge
speed of 23ps (typical 20% to 80%). This modulation
current reflects a modulation voltage of 1.0V
P-P
to 3.0V
P-
P
single ended or 2.0V
P-P
to 6.0V
P-P
differential.
The MAX3942 also includes an adjustable pulse-width
control circuit to precompensate for asymmetrical mod-
ulator characteristics. It is available in a compact 4mm
✕ 4mm, 24-pin thin QFN package and operates over
the -40°C to +85°C temperature range.
Features
♦ 23ps Edge Speed
♦ Single-Ended Modulation Voltage Up to 3V
P-P
♦ Differential Modulation Voltage Up to 6V
P-P
♦ Selectable Data-Retiming Latch
♦ Up to 10.7Gbps Operation
♦ 50Ω On-Chip Input and Output Terminations
♦ Pulse-Width Adjustment
♦ Enable and Polarity Controls
♦ ESD Protection
Applications
Mach Zehnder Modulators
Packaged Direct-Modulated Lasers
SONET OC-192 and SDH STM-64 Transmission
Systems
DWDM Systems
Long/Short-Reach Optical Transmitters
10Gbps Ethernet
MAX3942
10Gbps Modulator Driver
________________________________________________________________
Maxim Integrated Products
1
MAX3952
0.01μF
DATA+ DATA+
PLRT GND
50Ω
0.01μF
DATA- DATA-
50Ω
0.01μF
CLK+ CLK+
OUT+
50Ω
0.01μF
CLK- CLK-
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
-5.2V
50Ω
10Gbps
SERIALIZER
2kΩ
PWC+ PWC- V
EE
MODSET
+
V
MODSET
-
1000pF
-5.2V
-5.2V
0.1μF
-5.2V
MODEN
RTEN
50Ω
OUT-
50Ω
MAX3942
L2
L1
50Ω
50Ω
0.01μF
0.01μF
MACH ZEHNDER
MODULATOR
L1 AND L2 ARE HIGH-FREQUENCY FERRITE BEADS
19-2934; Rev 1; 6/07
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX3942ETG -40°C to +85°C 24 Thin QFN (4mm
4mm)
MAX3942ETG+ -40°C to +85°C 24 Thin QFN (4mm 4mm)
Pin Configuration appears at end of data sheet.
+
Denotes a lead-free package.
MAX3942
10Gbps Modulator Driver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
EE
..............................................-6.0V to +0.5V
Voltage at MODEN,
RTEN, PLRT, MODSET............................(V
EE
- 0.5V) to +0.5V
Voltage at DATA+, DATA-, CLK+, and CLK-……-1.65V to +0.5V
Voltage at OUT+, OUT- ................................……….-4V to +0.5V
Voltage at PWC+, PWC- ...................(V
EE
- 0.5V) to (V
EE
+ 1.7V)
Continuous Power Dissipation (T
A
= +85°C)
24-Pin Thin QFN (derate 20.8mW/° above +85°C) ....1354mW
Current into or out of OUT+, OUT-.................……………...80mA
Storage Temperature Range .....................……-55°C to +150°C
Operating Temperature Range ....................……-40°C to +85°C
Lead Temperature (soldering, 10s)............………………+300°C
ELECTRICAL CHARACTERISTICS
(V
EE
= -5.5V to -4.9V, T
A
= -40°C to +85°C. Typical values are at V
EE
= -5.2V, I
MOD
= 100mA, and T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Voltage V
EE
-5.5 -4.9 V
Retime disabled 125 175
Supply Current I
EE
Excluding I
MOD
(Note 1)
Retime enabled 140 200
mA
Power-Supply Noise Rejection PSNR f 2MHz (Note 2); see Figure 3 15 dB
SIGNAL INPUT (Note 3)
Input Data Rates NRZ 10.7 Gbps
Single-Ended Input Resistance R
IN
Input to GND 42.5 50 58.5
DC-coupled, Figure 1a -1 0
Single-Ended Input Voltage V
IS
AC-coupled, Figure 1b -0.4 +0.4
V
DC-coupled (Note 4) 0.2 2.0
Differential Input Voltage V
ID
AC-coupled (Note 4) 0.2 1.6
V
P-P
Differential Input Return Loss RL
IN
15GHz 15 dB
MODULATION (Note 5)
Maximum Modulation Current 112 120 mA
P-P
Minimum Modulation Current V
MODSET
= V
EE
37 41 mA
P-P
MODSET Voltage Range V
MODSET
V
EE
V
EE
+
V
Equivalent Modulation
R
MODEQV
(Note 7) 11.1
Modulation Set Bandwidth Modulation depth 10%, 50 driver load 5 MHz
MODSET Input Resistance 20 k
Modulation-Current
Temperature Stability
(Note 6) -980 0 ppm/°C
Modulation-Current-Setting Error 50 driver load, T
A
= +25°C -10 +10 %
Output Resistance R
OUT
OUT+ and OUT- to GND 42.5 50 58.5
MAX3942
10Gbps Modulator Driver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
EE
= -5.5V to -4.9V, T
A
= -40°C to +85°C. Typical values are at V
EE
= -5.2V, I
MOD
= 100mA, and T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Off Current
MODEN = V
EE
, MODSET = V
EE
, DATA+ =
high, DATA- = low
1.6 mA
Differential Output Return Loss RL
OUT
I
MOD
= 50mA 10GHz 10 dB
Output Edge Speed 20% to 80% (Notes 6, 8) 23 32 ps
Setup/Hold Time t
SU
, t
HD
Figure 2 (Note 6) 25 ps
Pulse-Width Adjustment Range (Notes 6, 8) ±30 ±50 ps
Pulse-Width Control Input
Range (Single Ended)
For PWC+ and PWC-
V
EE
+
0.5
V
EE
+
1.5
V
Pulse-Width Control Input
Range (Differential)
(PWC+) - (PWC-) -0.5 +0.5 V
Output Overshoot (Notes 6, 8) 5 %
Driver Random Jitter RJ
DR
(Note 6) 0.3 0.8 ps
RMS
Driver Deterministic Jitter DJ
DR
PWC- = GND (Notes 6, 9) 8 13 ps
P-P
CONTROL INPUTS
Input High Voltage V
IH
(Note 10)
V
EE
+
2.0
V
Input Low Voltage V
IL
(Note 10)
V
EE
+
0.8
V
Input Current (Note 10) -80 +200 μA
Note 1: Supply current remains elevated once the retiming function has been enabled. Power must be cycled to reduce supply
current after the retiming function has been disabled.
Note 2: Power-supply noise rejection is specified as PSNR = 20Log(V
noise (on Vcc)
/ ΔV
OUT
). V
OUT
is the voltage across a 50Ω load.
V
noise (on Vcc)
= 100mV
P-P
.
Note 3: For DATA+, DATA-, CLK+, and CLK-.
Note 4: CLK input characterized at 10.7Gbps.
Note 5: Minimum voltage on OUT+ and OUT- is V
EE
+ 1.9V.
Note 6: Guaranteed by design and characterization using the circuit shown in Figure 3.
Note 7: R
MODEQV
= (V
MODSET
- V
EE
) / (I
MOD
- 37mA).
Note 8: 50Ω load, characterized at 10.7Gbps with a 1111 1111 0000 0000 pattern.
Note 9: Deterministic jitter is defined as the arithmetic sum of PWD (pulse-width distortion) and PDJ (pattern-dependent jitter).
Measured with a 10.7Gbps 2
7
- 1 PRBS pattern with 80 zeros and 80 ones inserted in the data pattern.
Note 10: For MODEN and PLRT.
P1-P3P4-P6P7-P9P10-P10

MAX3942ETG+

Mfr. #:
Buy MAX3942ETG+
Manufacturer:
Maxim Integrated
Description:
Buffers & Line Drivers 10Gbps Modulator Driver
Lifecycle:
New from this manufacturer.
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