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1241CADC Datasheet(PDF) 3 Page - Agere Systems |
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1241CADC Datasheet(HTML) 3 Page - Agere Systems |
3 / 12 page Data Sheet September 1999 Agere Systems Inc. 3 1241/1243/1245-Type Uncooled Laser Functional Overview (continued) 1-868(C).h Figure 1. Simplified Transmitter Schematic Input Data LASER BACK-FACET MONITOR VOLTAGE 15 k• (2) (4) (+) (–) 15 k• LASER BIAS MONITOR VOLTAGE 15 k• (19) (17) (+) (–) 15 k• BAND GAP REFERENCE AUTOMATIC POWER CONTROL CIRCUITRY INPUT DATA COMPARATOR MODULATION CIRCUITRY TEMPERATURE SENSOR t IBF IBIAS VCC LASER BACK-FACET DETECTOR FIBER PIGTAIL 10 • DATA (16) (7) (15) TRANSMITTER DISABLE VCC – 1.3 V 30 k• 30 k• DATA IMOD Input Data Data enters the transmitter through a comparator. These inputs have internal pull-down resistors to a volt- age reference that is 1.3 V below VCC. This configura- tion allows the transmitter to be driven from either a single-ended or a differential input signal. Since the input is a comparator instead of a gate, the absolute input signal levels are not important when the inputs are driven differentially. When driven single-ended, however, the input signal voltage should be centered around VCC – 1.3 V to eliminate pulse-width distortion. With a single-ended input, either input can be used and the unused input can be left as an open circuit due to the internal reference shown in Figure 1. The optical output signal will be in the same sense as the input data—an input logic high turns the laser diode on and an input logic low turns the laser diode off. However, if the negative input is used with a single-ended data input signal, the optical signal will be the complement of the data input signal. The differental inputs of the 1241 Gbit versions are ter- minated internally with 100 Ω between the DATA and DATA inputs. Minimum Data Rate Because the modulation and bias control circuitry are influenced by the input data pattern, the standard transmitter cannot be used in burst-mode type applica- tions. For burst-mode applications, please contact your Agere Account Manager. The minimum data rate (pseudorandom data, 50% average duty cycle) for the 1241/1243/1245-Type Transmitters is approximately 1 Mbit/s. |
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