2000 Feb 22
20
Philips Semiconductors
Product specication
SDH/SONET STM1/OC3 laser drivers
TZA3031AHL; TZA3031BHL;
TZA3031U
8. The specified transconductance is the ratio between the bias current on pin BIAS and the voltage on pin TZERO,
under small signal conditions.
9. These are the guaranteed values; the lowest attainable output current will always be lower than 2.5 mA, and the
highest output current will always be higher than 60 mA.
10. The voltage rise and fall times (20% to 80%) can have larger values due to capacitive effects. Specifications are
guaranteed by design and characterization. Each device is tested at full operating speed to guarantee RF
functionality.
11. Measured in a frequency band from 250 kHz to 5 MHz, according to
“ITU-T Recommendation G.813”.
The electrically generated (current) jitter is assumed to be less than 50% of the optical output jitter. The specification
is guaranteed by design.
12. These are the guaranteed values; the lowest output current will always be less than 2.8 mA and the highest output
current will always be more than 90 mA.
13. The response time is defined as the delay between the onset of the ramp on pin ALS (at 10% of the HIGH level) and
the extinction of the bias current (at 10% of the original value).
14. The reference currents can be set by connecting a resistor between pin ALARMLO and VCC(R) and between
pin ALARMHI and VCC(R); for detailed information, see Section “Bias alarm for TZA3031AHL”. The corresponding
low-bias threshold range is 1.8 to 19.5 mA. The high-bias threshold range is 9 to 97.5 mA.
15. See Section “Bias alarm for TZA3031AHL”.
handbook, full pagewidth
MGK274
VIO
VI(max)
VI(min)
Vi(p-p)
VCC(R)
Fig.17 Logic level symbol definitions for data inputs.