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PDF MAX3667ECJ Data sheet ( Hoja de datos )
| Número de pieza | MAX3667ECJ | |
| Descripción | +3.3V / 622Mbps SDH/SONET Laser Driver with Automatic Power Control | |
| Fabricantes | Maxim Integrated | |
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19-1311; Rev 1; 3/98
EVAALVUAAILTAIOBNLEKIT
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
________________General Description
The MAX3667 is a complete, +3.3V laser driver with
automatic power control (APC), designed for SDH/
SONET applications up to 622Mbps. It accepts differ-
ential PECL inputs, provides single-ended bias and
modulation currents, and operates over a -40°C to
+85°C temperature range.
A temperature-stabilized reference voltage simplifies
laser current programming. It allows external program-
ming of the modulation current between 5mAp-p and
60mAp-p, and of the bias current between 5mA and
90mA.
The APC function, which incorporates a monitor photo-
diode, an external resistor, and two external capacitors,
maintains constant laser output power. Two current
monitors provide high-speed signals that are directly
proportional to the bias and modulation currents.
Additional features include disable/enable control and
a slow-start feature with a minimum turn-on time of
50ns. The MAX3667 is available in die form and in a
32-pin TQFP package.
________________________Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Repeaters
____________________________Features
o Single +3.3V or +5.0V Operation
o Automatic Average Power Control
o Bias Current and Modulation Current Monitor
Outputs
o TTL-Compatible Disable Input
o Temperature-Compensated Reference
o PECL-Compatible Data Inputs
_______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3667ECJ -40°C to +85°C
32 TQFP
MAX3667E/D
-40°C to +85°C
Dice*
*Dice are designed to operate from -40°C to +85°C but are
tested and guaranteed only at Tj = +25°C.
Pin Configuration appears at end of data sheet.
____________________________________________________Typical Operating Circuit
+3.3V
+3.3V
CCOMP 1µF
50Ω
0.1µF
MONITOR
DIODE
LASER
DIODE
0.1µF
COMP BIASMON MODMON APCSET
MAX3691
4:1
SERIALIZER
WITH
CLOCK GEN
130Ω 130Ω
IN+
PECL
IN-
MAX3667
82Ω 82Ω
GND DISABLE MODSET BIASSET
APC
VCC MD
IMOD
IBIAS
CAPC
1nF
RDAMP
1µF 4.7Ω
RFILT
22Ω
0.01µF
470nH
100Ω
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, VCC = +3.3V, unless otherwise noted.)
APC BANDWIDTH vs. CCOMP
(VARYING MONITOR-TO-LASER
CURRENT GAIN)
100G
10G
1G
100k
10k
1k
100
10
1pF
MEASURED RESULTS
GAIN = 90
GAIN = 60
GAIN = 30
100pF
SIMULATED
RESULTS
10nF
CCOMP
1µF
100µF
SUPPLY CURRENT vs. TEMPERATURE
160
EXCLUDING IBIAS
150 RMODSET = RBIASSET = 2kΩ
10Ω LOAD
140
130 VCC = +5.0V
120
110 VCC = +3.3V
100
90
80
-40
-15 10 35 60
TEMPERATURE (°C)
85
______________________________________________________________Pin Description
PIN
1, 2, 23, 24
3, 6, 8, 13, 14,
15, 18, 20, 22
4
5
7
9, 26, 28, 31
10
11
12
16
17
19, 21
25
27
29
30
32
NAME
VCC
GND
IN+
IN-
DISABLE
N.C.
MODSET
APC
BIASSET
IBIAS
PULLUP
IMOD
MD
APCSET
BIASMON
MODMON
COMP
Supply Voltage Input
FUNCTION
Ground
Positive PECL-Compatible Input
Negative PECL-Compatible Input
Disable Input. High = disable, TTL-compatible input.
No Connection
Adjustment for Laser-Diode Modulation Current
Feedback Current for Closed-Loop Laser-Diode Bias Control
Open-Loop Adjustment for Laser-Diode Bias Current
Laser-Diode DC Bias Current
VCC Supply for Internal 31Ω Pull-Up Resistor
Laser-Diode Modulation Current
Input for PIN Monitor Diode Current
Closed-Loop Adjustment for Laser-Diode Bias Current
IBIAS Current Monitor (gain = 1/38 IBIAS). Open PNP collector, connect to ground if not used.
IMOD Current Monitor (gain = 1/33 IQMOD). Open PNP collector, connect to ground if not used.
External Compensation Capacitor for Closed-Loop Laser-Diode Bias Current Control Stability
_______________________________________________________________________________________ 5
5 Page 
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
___________________Pin Configuration
TOP VIEW
___________________Chip Topography
VCC IMOD IMOD PULLUP
VCC GND GND GND
VCC 1
VCC 2
GND 3
IN+ 4
IN- 5
GND 6
DISABLE 7
GND 8
32 31 30 29 28 27 26 25
MAX3667
24 VCC
23 VCC
22 GND
21 IMOD
20 GND
19 IMOD
18 GND
17 PULLUP
9 10 11 12 13 14 15 16
TQFP
MD
N.C.
APCSET
N.C.
BIASMON
MODMON
N.C.
COMP
IBIAS
0.113"
(2.870mm)
GND
GND
GND
BIASSET
APC
MODSET
N.C.
VCC IN+ GND GND
VCC GND IN- DISABLE
0.106"
(2.692mm)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3667ECJ.PDF ] | |
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